阅读说明：本技术 电极极片、电极极片的制作方法及电化学储能器件 (Electrode pole piece, manufacturing method of electrode pole piece and electrochemical energy storage device ) 是由 崔超婕 张刚 骞伟中 金鹰 杨周飞 钱陆明 叶珍珍 张磊 张帆 刘兴稳 于 2020-10-28 设计创作，主要内容包括：一种电极极片,所述电极极片呈三明治结构,所述电极极片包括一中间复合层、一第一电极材料层及一第二电极材料层。所述复合材料层包括泡沫集流体及电极材料,所述泡沫集流体具有大量联通孔隙,所述电极材料填充在所述孔隙内。所述第一电极材料层及所述第二电极材料层形成在所述泡沫集流体的相背两表面上。本发明还提供一种电极片的制作方法及电化学储能器件。本发明提供的电极极片及其制作方法以及电化学储能器件,通过调节中间复合层与第一电极材料及第二电极材料层的比例,可获得能量型器件、功率型器件或兼顾功率密度与能量密度的器件。(The utility model provides an electrode plate, electrode plate is sandwich structure, electrode plate includes an intermediate composite layer, a first electrode material layer and a second electrode material layer. The composite material layer comprises a foam current collector and an electrode material, wherein the foam current collector is provided with a large number of communicated pores, and the electrode material is filled in the pores. The first electrode material layer and the second electrode material layer are formed on opposite surfaces of the foam current collector. The invention also provides a manufacturing method of the electrode plate and an electrochemical energy storage device. According to the electrode plate, the manufacturing method thereof and the electrochemical energy storage device, the proportion of the intermediate composite layer to the first electrode material layer and the proportion of the intermediate composite layer to the second electrode material layer are adjusted, so that an energy-type device, a power-type device or a device with both power density and energy density can be obtained.)

1. The utility model provides an electrode plate, its characterized in that, electrode plate is sandwich structure, electrode plate includes an intermediate compound layer, a first electrode material layer and a second electrode material layer, the compound material layer includes the foam current collector and electrode material, the foam current collector has a large amount of UNICOM's holes, electrode material fills in the hole, first electrode material layer reaches second electrode material layer is formed on the two opposite sides of foam current collector.

2. The electrode tab of claim 1 wherein the intermediate composite layer has a thickness of 50 μ ι η to 200 μ ι η.

3. The electrode pad of claim 2, wherein the first electrode material layer and the second electrode material layer have a thickness that is the same, and the total thickness of the first electrode material layer and the second electrode material layer is 10% to 100% of the thickness of the intermediate composite layer.

4. The electrode sheet of claim 1, wherein the foamed aluminum current collector has a porosity of 90% to 96%, an original thickness of 0.5mm to 1mm, and a resistivity of 0.8 x 10 when the foamed aluminum current collector is pressed to 50 μ ι η to 200 μ ι η^-7～0.2*10^-8Ω·m。

5. The electrode sheet according to claim 1, wherein the electrode material is at least one of carbon, carbon or carbon loaded with metal oxides, sulfur, lithium iron phosphate, ternary positive electrode material, lithium manganate, lithium cobaltate, lithium-rich material, iron-manganese-nickel-based material, prussian blue-based material; the metal oxide includes at least one of nickel oxide, ruthenium oxide, manganese oxide, and iron oxide.

6. A method of making an electrode pad according to any one of claims 1 to 5, comprising:

preparing electrode materials into slurry;

coating a portion of the slurry on a foam current collector, the foam current collector having a plurality of communicating pores;

filling the slurry into the pores of the foam current collector in a rolling manner and pressing the foam current collector filled with the slurry into an intermediate composite layer;

coating part of the slurry on one surface of the intermediate composite layer, and rolling the slurry to form a first electrode material layer on one surface of the intermediate composite layer;

coating part of the slurry on the other surface of the intermediate composite layer, and rolling the slurry to form a second electrode material layer on the other surface of the intermediate composite layer opposite to the first electrode material layer so as to obtain an electrode plate structure; and

and drying the electrode plate structure to obtain an electrode plate.

7. The method for manufacturing the electrode plate according to claim 6, wherein the slurry further comprises an adhesive and a solvent, the solid content of the slurry is 40% -60%, the ratio of the electrode material to the adhesive is 10:1-20:1, and the solvent is water or an organic solvent.

8. An electrochemical energy storage device, comprising one or two electrode sheets according to any one of claims 1 to 5, wherein the electrode sheets are at least one of a positive electrode sheet and a negative electrode sheet in the electrochemical energy storage device.

9. The electrochemical energy storage device of claim 8, wherein when said electrochemical energy storage device is at least one of a lithium ion battery, a sodium ion battery, a lithium sulfur battery, a battery type capacitor, a lithium ion capacitor, a sodium ion capacitor, and a hybrid capacitor, said electrode sheet serves as a positive electrode sheet of said electrochemical energy storage device.

10. Electrochemical energy storage device according to claim 9, characterized in that the areal density of the electrode material of the positive electrode plate of the lithium-ion battery or of the sodium-ion battery or of the battery-type capacitor is 20 to 100mg/cm²。

11. The electrochemical energy storage device of claim 9, wherein the areal density of the electrode material of the positive electrode plate of said lithium sulfur battery or said lithium ion capacitor or said sodium ion capacitor or said hybrid capacitor is from 5 to 20mg/cm²。

12. The electrochemical energy storage device of claim 8, wherein said electrode pads serve as a positive electrode pad and said negative electrode pad of said electrochemical energy storage device when said electrochemical energy storage device is an electric double layer capacitor or a pseudocapacitor.

13. The electrochemical energy storage device of claim 9, wherein the areal density of the electrode material of the positive and negative electrode plates of said pseudocapacitor is 20-100mg/cm²。

14. The electrochemical energy storage device of claim 9, wherein the areal density of the electrode material of the positive and negative electrode plates of the double layer capacitor is 5-20mg/cm²。

Technical Field

The invention relates to an electrode plate, a manufacturing method of the electrode plate and an electrochemical energy storage device.

Background

Electrochemical energy storage devices, including batteries and capacitors, have been developed rapidly in recent years, become representative of new energy fields, and form a huge consumer market. Representative energy storage devices include: lithium ion batteries, sodium ion batteries, lithium sulfur batteries; electric double layer capacitors, sodium ion capacitors, lithium ion capacitors, hybrid capacitors, battery type capacitors, pseudocapacitors, and the like. When the energy storage devices are used for power batteries for vehicles and mobile electronic consumer goods, the energy density and the power density are improved. Meanwhile, the structures of the devices have commonality, and the devices play a main role in providing energy by positive and negative pole pieces; and the electrolyte, the diaphragm, the current collector and the shell are auxiliary components. In principle, the larger the active material ratio on the positive and negative electrode plates is, the higher the energy density of the device is. The existing and relatively mature processing method is that electrode material is mixed with conductive agent, adhesive and the like to form slurry, and the slurry is coated, rolled and cured together and then is tightly adhered to metal foil; and welding the lugs, separating the lugs by using a diaphragm, and injecting electrolyte to form a finished product of the battery or the capacitor. In such a structure, the energy density can be increased in principle by increasing the amount of the active material. But ion diffusion is limited and power density is reduced.

Disclosure of Invention

In view of this, the present invention provides an electrode plate with a novel structure.

In addition, it is also necessary to provide a method for manufacturing the electrode plate.

In addition, it is also necessary to provide an electrochemical energy storage device employing the electrode sheet as described above.

The utility model provides an electrode plate, electrode plate is sandwich structure, electrode plate includes an intermediate compound layer, a first electrode material layer and a second electrode material layer, the compound material layer includes the foam current collector and electrode material, the foam current collector has a large amount of UNICOM's holes, electrode material fills in the hole, first electrode material layer reaches second electrode material layer forms and is in the foam current collector back of the body on two surfaces mutually.

Further, the thickness of the intermediate composite layer is 50 μm to 200 μm.

Further, the thickness of the first electrode material layer is consistent with that of the second electrode material layer, and the total thickness of the first electrode material layer and the second electrode material layer is 10% -100% of the thickness of the intermediate composite layer.

Further, the porosity of the foamed aluminum current collector is 90% -96%, the original thickness of the foamed aluminum current collector is 0.5-1mm, and the resistivity of the foamed aluminum current collector is 0.8 x 10 when the foamed aluminum current collector is pressed to 50-200 μm^-7～0.2*10^-8Ω·m。

Further, the electrode material is at least one of carbon, carbon or carbon loaded with metal oxides, sulfur, lithium iron phosphate, ternary positive electrode material, lithium manganate, lithium cobaltate, lithium-rich material, iron-manganese-nickel-based material and Prussian blue material; the metal oxide includes at least one of nickel oxide, ruthenium oxide, manganese oxide, and iron oxide.

A manufacturing method of the electrode plate comprises the following steps: preparing electrode materials into slurry; coating a portion of the slurry on a foam current collector, the foam current collector having a plurality of communicating pores; filling the slurry into the pores of the current collector in a rolling manner and pressing the foamed current collector filled with the slurry into an intermediate composite layer; coating part of the slurry on one surface of the intermediate composite layer, and rolling the slurry to form a first electrode material layer on one surface of the intermediate composite layer; coating part of the slurry on the other surface of the intermediate composite layer, and rolling the slurry to form a second electrode material layer on the other surface of the intermediate composite layer opposite to the first electrode material layer so as to obtain an electrode plate structure; and drying the electrode plate structure to obtain an electrode plate.

Further, the slurry also comprises a binder and a solvent, the solid content of the slurry is 40% -60%, the ratio of the electrode material to the binder is 10:1-20:1, and the solvent is water or an organic solvent.

An electrochemical energy storage device comprises one or two electrode pole pieces as described above, wherein the electrode pole piece is at least one of a positive pole piece and a negative pole piece in the electrochemical energy storage device.

Further, when the electrochemical energy storage device is a lithium ion battery, a sodium ion battery, a lithium sulfur battery, a battery type capacitor, a lithium ion capacitor, a sodium ion capacitor, or a hybrid capacitor, the electrode plate is used as a positive electrode plate of the electrochemical energy storage device.

Further, the surface density of the electrode material of the positive electrode plate of the lithium ion battery or the sodium ion battery or the battery type capacitor is 20-100mg/cm²。

Further, the surface density of the electrode material of the positive electrode plate of the lithium-sulfur battery or the lithium ion capacitor or the sodium ion capacitor or the hybrid capacitor is 5-20mg/cm²。

Further, when the electrochemical energy storage device is an electric double layer capacitor or a pseudo capacitor, the electrode pole pieces are used as a positive pole piece and a negative pole piece of the electrochemical energy storage device.

Furthermore, the surface density of the electrode materials of the positive pole piece and the negative pole piece of the pseudocapacitor is 20-100mg/cm²。

Furthermore, the surface density of the electrode material of the positive electrode plate and the negative electrode plate of the double-layer capacitor is 5-20mg/cm²。

The invention provides an electrode plate, a manufacturing method of the electrode plate and an electrochemical energy storage device, 1) electrode materials are filled in pores of a foam current collector and pressed into a middle composite layer, and then a first electrode material layer and a second electrode material layer are formed on two opposite sides of the middle composite layer to form the electrode plate with a sandwich structure in which a three-dimensional conductive network is arranged, so that the internal resistance of the electrode plate is obviously reduced; 2) the proportion of active materials (electrode materials) in the electrode pole piece can be flexibly adjusted by controlling the surface density and thickness of the electrode material of the intermediate composite layer and the surface density and thickness of the electrode materials of the first electrode material layer and the second electrode material layer respectively, so that the energy density and the power density of the electrochemical energy storage device can be flexibly adjusted and controlled; 3) compared with a foamed aluminum pole piece, the two sides of the electrode pole piece provided by the invention are provided with more compact electrode material layers, burrs are reduced, the electrode pole piece is suitable for rolling under higher pressure, and the yield of the electrode pole piece is increased by 30% while the energy density and the power density are improved; 4) compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece provided by the invention is reduced by 20-80%, and the power performance is improved by 15-80%; 5) compared with a pure foamed aluminum pole piece, the rolling pressure resistance of the electrode pole piece is improved by 20-80%, and when the energy density is improved by 10-80%, the power density is improved by 10-80%.

Drawings

FIG. 1 is a cross-sectional view of an intermediate composite layer according to a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of a first electrode material layer and a second electrode material layer formed on opposite surfaces of the intermediate composite layer shown in fig. 1 to form an electrode pad.

Description of the main elements

Electrode plate 100

Intermediate composite layer 10

Foam current collector 11

Pores 111

Slurry 12

First electrode material layer 20

Second electrode material layer 30

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In order to further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on the specific embodiments, structures, features and effects of the electrode sheet manufacturing method and the electrochemical energy storage device provided by the present invention with reference to the accompanying drawings 1-2 and the preferred embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-2, the present invention provides a method for manufacturing an electrode sheet 100, comprising the steps of:

in a first step, referring to fig. 1, an electrode material is made into a paste 12.

Wherein the slurry 12 further comprises a binder and a solvent. The solid content of the slurry 12 is 40-60%. The ratio of the electrode material to the binder is 10:1-20: 1.

The electrode material is at least one of carbon, carbon or carbon loaded with metal oxides, sulfur, lithium iron phosphate, ternary positive electrode materials, lithium manganate, lithium cobaltate, lithium-rich materials, iron-manganese-nickel-based materials, Prussian blue materials and the like. The metal oxide includes at least one of nickel oxide, ruthenium oxide, manganese oxide, iron oxide, and the like.

Wherein the solvent is water or an organic solvent.

Secondly, referring to fig. 1, a portion of the slurry 12 is coated on a foam current collector 11 (not shown), which has a plurality of communicating pores 111; and filling the slurry into the pores 111 of the foamed current collector 11 by rolling, and pressing the foamed current collector 11 filled with the slurry 12 into an intermediate composite layer 10.

In this embodiment, the porosity of the foamed aluminum current collector is 90% to 96%.

In this embodiment, the aluminum foam current collector is an aluminum foam current collector.

In the present embodiment, the thickness of the intermediate composite layer 10 is controlled to be 50 μm to 200 μm.

In the present embodiment, the thickness of the foam current collector 11 is 0.5mm to 1 mm.

In the present embodiment, the aluminum foam current collector has a resistivity of 0.8 x 10 when the aluminum foam current collector is pressed to 50 to 200 μm^-7～0.2*10^-8Ω·m。

Thirdly, referring to fig. 1-2, coating a portion of the paste 12 on a surface of the intermediate composite layer 10, and rolling the paste 12 to form a first electrode material layer 20 on a surface of the intermediate composite layer 10; and coating the slurry 12 on the other surface of the intermediate composite layer 10, and rolling the slurry 12 to form a second electrode material layer 30 on the other surface of the intermediate composite layer 10 opposite to the first electrode material layer 20, thereby obtaining an electrode sheet structure (not shown).

Wherein the first electrode material layer 20 and the second electrode material layer 30 have the same thickness. The total thickness of the first electrode material layer 20 and the second electrode material layer 30 is 10% to 100% of the thickness of the intermediate composite layer 10.

Wherein, the content of the slurry 12 in the foam current collector 11 can be controlled by controlling the coating thickness of part of the slurry 12 on the foam current collector 11, and thus the content of the electrode material in the foam current collector 11 can be controlled.

The thicknesses of the first electrode material layer and the second electrode material layer can be controlled by controlling the coating thicknesses of part of the slurry 12 on the opposite surfaces of the intermediate composite layer 10, so as to flexibly adjust the proportion of active materials (electrode materials) in the electrode plate.

And fourthly, drying the electrode plate structure to desorb the solvent used in the slurry preparation, so as to obtain an electrode plate 100.

In this step, the electrode sheet structure may be dried by a drying apparatus such as a drying oven or a drying furnace.

Referring to fig. 2, the present invention further provides an electrode sheet 100. The electrode plate 100 is of a sandwich structure. The electrode plate 100 includes an intermediate composite layer 10, a first electrode material layer 20 and a second electrode material layer 30, the composite layer 10 includes a foam current collector 11 and an electrode material, the foam current collector 11 has a large number of communication pores 111, the electrode material is filled in the pores 111, and the first electrode material layer 20 and the second electrode material layer 30 are formed on the opposite surfaces of the foam current collector 11.

Wherein the thickness of the intermediate composite layer is 50 μm to 200 μm.

Wherein the thickness of the first electrode material layer 20 is consistent with that of the second electrode material layer 30, and the total thickness of the first electrode material layer 20 and the second electrode material layer 30 is 10-100% of the thickness of the intermediate composite layer 10.

Wherein the porosity of the foamed aluminum current collector 11 is 90-96%, the original thickness of the foamed aluminum current collector 11 is 0.5-1mm, and when the foamed aluminum current collector 11 is pressed to 50-200 μm, the resistivity of the foamed aluminum current collector 11 is 0.8 x 10^-7～0.2*10^-8Ω· m。

The electrode material is at least one of carbon, carbon or carbon loaded with metal oxides, sulfur, lithium iron phosphate, ternary positive electrode materials, lithium manganate, lithium cobaltate, lithium-rich materials, iron-manganese-nickel-based materials, Prussian blue materials and the like. The metal oxide includes at least one of nickel oxide, ruthenium oxide, manganese oxide, and iron oxide.

The present invention further provides an electrochemical energy storage device (not shown), the electrochemical energy storage device includes one or two electrode plates 100, and the electrode plate 100 may be at least one of a positive electrode plate and a negative electrode plate of the electrochemical energy storage device.

The electrochemical energy storage device may be a battery or a capacitor.

Specifically, when the electrochemical energy storage device is at least one of a lithium ion battery, a sodium ion battery, a lithium sulfur battery, a battery type capacitor, a lithium ion capacitor, a sodium ion capacitor, and a hybrid capacitor, the electrode sheet 100 may serve as a positive electrode sheet of the electrochemical energy storage device.

Specifically, the positive electrode material of lithium ion capacitors, hybrid capacitors, sodium ion capacitors includes carbon or charcoal. The positive electrode of the lithium sulfur battery is sulfur. The anode material of the lithium ion battery or the battery type capacitor comprises at least one of lithium iron phosphate, a ternary anode material, lithium manganate, lithium cobaltate, a lithium-rich material, carbon and the like; the positive electrode material of the sodium-ion battery is at least one of a ferro-manganese nickel-based material, a Prussian blue material and the like.

Wherein the surface density of the electrode material of the positive electrode plate of the lithium ion battery or the sodium ion battery or the battery type capacitor is 20-100mg/cm². The surface density of the electrode material of the positive pole piece of the lithium-sulfur battery or the lithium ion capacitor or the sodium ion capacitor or the hybrid capacitor is 5-20mg/cm²。

Specifically, when the electrochemical energy storage device is an electric double layer capacitor or a pseudocapacitor, the electrode sheet 100 may be used as a positive electrode sheet and a negative electrode sheet of the electrochemical energy storage device.

Specifically, both the positive electrode material and the negative electrode material of the electric double layer capacitor are carbon or carbon. The positive electrode material and the negative electrode material of the pseudocapacitor are both carbon or carbon-loaded metal oxides, and the metal oxides comprise at least one of nickel oxide, ruthenium oxide, manganese oxide, iron oxide and the like.

Wherein the surface density of the electrode material of the positive pole piece and the negative pole piece of the pseudocapacitor is 20-100mg/cm². The surface density of the electrode material of the positive electrode plate and the negative electrode plate of the double-layer capacitor is 5-20mg/cm² mg/cm²。

The method for manufacturing the electrode sheet 100 and the performance thereof according to the present invention will be described in detail with reference to the following embodiments.

Example 1

In the double-electric-layer capacitor, a positive pole piece and a negative pole piece are in a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 1mm, and the porosity is 95%; the electrical resistivity of the aluminum foam current collector was 0.8 x 10-7 Ω -m when the aluminum foam current collector was pressed to 200 μm.

The first step is as follows: the electrode material (carbon) was made into a slurry. The solid content of the slurry is 40%, the ratio of the electrode material to the binder is 20:1, and the solvent for preparing the slurry is water. The surface density of the electrode material of the electrode pole piece is 15mg/cm²。

The second step is that: coating part of the slurry on a foamed aluminum current collector with the thickness of 1mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is 200 microns.

The third step: coating part of the slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer for 180 degrees, coating part of the slurry on the other side of the intermediate composite layer, and forming a second electrode material layer on the other side of the intermediate composite layer through rolling, thereby forming an electrode pole piece structure with a sandwich structure. The total thickness of the first electrode material layer and the second electrode material layer is 10% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 1 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in the embodiment 1 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 50%.

Example 2

In the pseudo capacitor, a positive pole piece and a negative pole piece are in a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.5mm, and the porosity is 96%; the aluminum foam current collector has a resistivity of 0.4 x 10 when pressed to 70 μm^-8Ω·m。

The first step is as follows: the electrode material (carbon-supported manganese oxide) was made into a slurry. The solid content of the slurry is 60%, the ratio of the electrode material to the binder is 10:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 20mg/cm²。

The second step is that: coating part of the slurry on a foamed aluminum current collector with the thickness of 0.5mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of an electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 70 μm.

The third step: coating part of the slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the other side of the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 100% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 2 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 2 can be improved by 80%, and when the energy density is improved by 80%, the power can be improved by 10%.

Example 3

In a lithium ion battery, the positive electrode thereofThe pole piece is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.7mm, and the porosity is 90%; the electrical resistivity of the aluminum foam current collector was 0.34 x 10 when the aluminum foam current collector was pressed to 80 μm^-8Ω·m。

The first step is as follows: an electrode material (lithium iron phosphate) was made into a slurry. The solid content of the slurry is 60%, the ratio of the electrode material to the binder is 10:1, and the solvent for preparing the slurry is water.

The second step is that: coating part of the slurry on the foamed aluminum current collector with the thickness of 0.7mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 80 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate. The electrode material has an areal density of 50mg/cm2, and the combined thickness of the first and second electrode material layers is 60% of the thickness of the intermediate composite layer.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained by the embodiment can be improved by 50%, and when the energy density is improved by 30%, the power can be improved by 30%.

Example 4

In the sodium ion battery, the positive pole piece is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.8mm, the porosity is 93 percent, and the foamed aluminum current collectorThe resistivity of the foamed aluminium current collector was 0.52 x 10 when pressed to 105 μm^-8Ω·m。

The first step is as follows: the electrode material (manganese ferrite-based material) was made into a slurry. The solid content of the slurry is 60%, the ratio of the electrode material to the binder is 17:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 35mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.8mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 105 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 30% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 3 is reduced by 80%, and the power performance is improved by 50%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 3 can be improved by 30%, and when the energy density is improved by 30%, the power can be improved by 10%.

Example 5

In the lithium-sulfur battery, a positive pole piece is of a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.92mm, and the porosity is 90%; the aluminum foam current collector has a resistivity of 0.24 x 10 when pressed to 72 μm^-8Ω·m。

The first step is as follows: preparing an electrode material (sulfur) into slurry, wherein the solid content of the slurry is 60%, the ratio of the electrode material to a binder is 10:1, and a solvent for preparing the slurry is an organic solvent. The surface density of the electrode material is 5mg/cm²。

The second step is that: coating part of the slurry on the foamed aluminum current collector with the thickness of 0.92mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 72 mu m.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 90% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 5 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 5 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 6

In the battery type capacitor, the positive electrode plate is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.5mm, and the porosity is 90; the aluminum foam current collector has a resistivity of 0.2 x 10 when pressed to 50 μm^-8Ω·m。

The first step is as follows: electrode material (90% ternary material and 10% carbon) was made into a slurry, soThe solid content of the slurry is 55%, the ratio of the electrode material to the binder is 10:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 50mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.5mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 50 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 50% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 6 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 6 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 7

In the hybrid capacitor, the positive pole piece is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.85mm, and the porosity is 95%; the aluminum foam current collector has a resistivity of 0.12 x 10 when pressed to 90 μm^-7Omega.m. The surface density of the electrode material is 15mg/cm²。

The first step is as follows: preparing electrode material (carbon) into slurry, wherein the solid content of the slurry is 52%, the ratio of the electrode material to the binder is 10:1, and the solvent for preparing the slurry is water.

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.85mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 90 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 80% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 7 is reduced by 24 percent, and the power performance is improved by 45 percent. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 7 can be improved by 54%, and when the energy density is improved by 18%, the power can be improved by 70%.

Example 8

In the lithium ion capacitor, the positive pole piece is a sandwich structure constructed by a foamed aluminum current collector. The original thickness of the used foamed aluminum current collector is 0.58mm, and the porosity is 93 percent; the resistivity of the foamed aluminum current collector is 1 x 10 when the foamed aluminum current collector is pressed to 110 mu m^-8Ω·m。

The first step is as follows: preparing electrode material (carbon) into slurry, wherein the solid content of the slurry is 50%, the ratio of the electrode material to the binder is 15:1, and the solvent for preparing the slurry is water.

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.58mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 110 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate. The electrode material has an areal density of 10mg/cm2, and the combined thickness of the first and second electrode material layers is 70% of the thickness of the intermediate composite layer.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 8 is reduced by 30%, and the power performance is improved by 60%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 8 can be improved by 52%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 9

In the sodium ion capacitor, the positive pole piece is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.5mm, and the porosity is 90; the aluminum foam current collector has a resistivity of 0.8 x 10 when pressed to 120 μm^-8Ω·m。

The first step is as follows: preparing electrode material (carbon) into slurry, wherein the solid content of the slurry is 60%, the ratio of the electrode material to the binder is 10:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 18mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.5mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 120 microns.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 40% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the example 9 is reduced by 43 percent, and the power performance is improved by 80 percent. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 9 can be increased by 35%, and when the energy density is increased by 26%, the power can be increased by 50%.

Example 10

In the lithium ion battery, the anode plate is a sandwich structure constructed by a foamed aluminum current collector. The original thickness of the used foamed aluminum current collector is 0.51mm, and the porosity is 90%; the aluminum foam current collector has a resistivity of 0.4 x 10 when pressed to 80 μm^-8Omega.m. The surface density of the electrode material is 35mg/cm²。

The first step is as follows: preparing an electrode material (lithium cobaltate) into slurry, wherein the solid content of the slurry is 60%, the ratio of the electrode material to a binder is 10:1, and the solvent for preparing the slurry is water.

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.51mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 80 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 50% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 10 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 10 can be improved by 42%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 11

In the battery type capacitor, the positive electrode plate is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.65mm, and the porosity is 91; the aluminum foam current collector has a resistivity of 0.5 x 1 when pressed to a thickness of 100 μm^0-7Ω·m。

The first step is as follows: preparing electrode materials (95% of lithium manganate and 5% of carbon) into slurry, wherein the solid content of the slurry is 50%, the ratio of the electrode materials to the binder is 10:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 38mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.65mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 100 mu m.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 50% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 11 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 11 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 12

In the lithium ion battery, the anode plate is a sandwich structure constructed by a foamed aluminum current collector. The original thickness of the used foamed aluminum current collector is 0.75mm, and the porosity is 93 percent; the aluminum foam current collector has a resistivity of 0.32 x 10 when pressed to 75 μm^-8Ω·m。

The first step is as follows: preparing an electrode material (a lithium-rich cathode material) into slurry, wherein the solid content of the slurry is 60%, the ratio of the electrode material to a binder is 15:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 100mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.75mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 75 microns.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 20% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the example 12 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 12 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 80%.

Example 13

In the pseudo capacitor, the anode and cathode pole pieces are in a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.67mm, and the porosity is 94%; the aluminum foam current collector has a resistivity of 0.28 x 10 when pressed to 72 μm^-8Ω·m。

The first step is as follows: preparing an electrode material (carbon-supported ruthenium oxide) into slurry, wherein the solid content of the slurry is 51%, the ratio of the electrode material to a binder is 18:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 18mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.67mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 72 mu m.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 90% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in example 13 is reduced by 20%, and the power performance is improved by 20%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 13 can be improved by 80%, and when the energy density is improved by 20%, the power can be improved by 20%.

Example 14

In the pseudo capacitor, the anode and cathode pole pieces are in a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.8mm, and the porosity is 92%; the aluminum foam current collector has a resistivity of 0.5 x 10 when pressed to 140 μm^-7Ω·m。

The first step is as follows: preparing electrode materials (iron oxide and nickel oxide loaded by carbon) into slurry, wherein the solid content of the slurry is 55%, the ratio of the electrode materials to the binder is 11:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 20mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.8mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 140 microns.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 50% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the example 14 is reduced by 45%, and the power performance is improved by 72%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 14 can be improved by 25%, and when the energy density is improved by 12%, the power can be improved by 30%.

Example 15

In the battery type capacitor, the positive electrode plate is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.76mm, and the porosity is 92%; the aluminum foam current collector has a resistivity of 0.38 x 10 when pressed to 65 μm^-8Ω·m。

The first step is as follows: preparing an electrode material (1% of carbon and 99% of lithium iron phosphate) into slurry, wherein the solid content of the slurry is 40%, the ratio of the electrode material to a binder is 12:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 45mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.76mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 65 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 60% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 15 is reduced by 45%, and the power performance is improved by 60%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 15 can be improved by 45%, and when the energy density is improved by 30%, the power can be improved by 15%.

Example 16

In the sodium ion battery, the positive pole piece is a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.84mm, and the porosity is 93 percent; the aluminum foam current collector has a resistivity of 0.6 x 10 when pressed to 170 μm^-7Ω·m。

The first step is as follows: preparing an electrode material (Prussian blue material) into slurry, wherein the solid content of the slurry is 50%, the ratio of the electrode material to a binder is 15:1, and the solvent for preparing the slurry is water. The surface density of the electrode material is 55mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.84mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 170 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 10% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the example 16 is reduced by 80%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 16 can be improved by 20%, and when the energy density is improved by 30%, the power can be improved by 30%.

Example 17

In the electric double layer capacitor, the anode and cathode pole pieces are in a sandwich structure constructed by foamed aluminum current collectors. The original thickness of the used foamed aluminum current collector is 0.96mm, and the porosity is 91%; the aluminum foam current collector has a resistivity of 0.2 x 10 when pressed to 50 μm^-8Ω·m。

The first step is as follows: preparing electrode material (carbon) into slurry, wherein the solid content of the slurry is 58.2%, the ratio of the electrode material to the binder is 16:1, and the solvent for preparing the slurry is organic solvent. The surface density of the electrode material is 20mg/cm²。

The second step is that: coating the slurry on the foamed aluminum current collector with the thickness of 0.96mm, filling the slurry into pores of the foamed aluminum current collector in a rolling manner, and directly pressing the foamed aluminum current collector filled with the slurry into an intermediate composite layer of the electrode plate, wherein the thickness of the intermediate composite layer is controlled to be 50 μm.

The third step: coating part of slurry on the intermediate composite layer, forming a first electrode material layer on one side of the intermediate composite layer through rolling, turning the intermediate composite layer by 180 degrees, coating part of the slurry on the intermediate composite layer, and forming a second electrode material layer on the intermediate composite layer through rolling. Thus, the electrode plate structure with a sandwich structure is formed. The total thickness of the first electrode material layer and the second electrode material layer is 100% of the thickness of the intermediate composite layer.

The fourth step: and drying the electrode plate structure, and desorbing the solvent used in the preparation of the slurry to obtain the finished product of the electrode plate.

Compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece obtained in the embodiment 17 is reduced by 50%, and the power performance is improved by 80%. Compared with a pure foamed aluminum pole piece, the rolling pressure of the electrode pole piece obtained in example 17 can be improved by 80%, and when the energy density is improved by 20%, the power can be improved by 15%.

The invention provides an electrode plate, a manufacturing method of the electrode plate and an electrochemical energy storage device, 1) electrode materials are filled in pores of a foam current collector and pressed into a middle composite layer, and then a first electrode material layer and a second electrode material layer are formed on two opposite sides of the middle composite layer to form the electrode plate with a sandwich structure in which a three-dimensional conductive network is arranged, so that the internal resistance of the electrode plate is obviously reduced; 2) the proportion of active materials (electrode materials) in the electrode pole piece can be flexibly adjusted by controlling the surface density and thickness of the electrode material of the intermediate composite layer and the surface density and thickness of the electrode materials of the first electrode material layer and the second electrode material layer respectively, so that the energy density and the power density of the electrochemical energy storage device can be flexibly adjusted and controlled; 3) compared with a foamed aluminum pole piece, the two sides of the electrode pole piece provided by the invention are provided with more compact electrode material layers, burrs are reduced, the electrode pole piece is suitable for rolling under higher pressure, and the yield of the electrode pole piece is increased by 30% while the energy density and the power density are improved; 4) compared with the aluminum foil type pole piece with the same thickness, the internal resistance of the electrode pole piece provided by the invention is reduced by 20-80%, and the power performance is improved by 15-80%; 5) compared with a pure foamed aluminum pole piece, the rolling pressure resistance of the electrode pole piece is improved by 20-80%, and when the energy density is improved by 10-80%, the power density is improved by 10-80%.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.