阅读说明：本技术 空气电池用正极和空气电池 (Air cell anode and air cell ) 是由 泽田光一 川岛勉 于 2018-09-13 设计创作，主要内容包括：空气电池用正极具备集电体和包含导电性材料的多孔质层。集电体包括基座部和配置在基座部的至少第1主面上的多个突起部。基座部的第1主面为平面。多孔质层在基座部的第1主面上与第1主面接触地配置。突起部在多孔质层的内部与多孔质层接触。(Air cell anode has collector and the porous layer comprising conductive material.Collector includes the multiple protrusions of base portion and configuration at least the 1st interarea of base portion.1st interarea of base portion is plane.Porous layer contiguously configures on the 1st interarea of base portion with the 1st interarea.Protrusion is contacted in the inside of porous layer with porous layer.)

1. a kind of air cell anode, has collector and the porous layer comprising conductive material,

The collector includes the multiple protrusions of base portion and configuration at least the 1st interarea of the base portion,

The 1st interarea of the base portion is plane,

The porous layer contiguously configures on the 1st interarea of the base portion with the 1st interarea,

The protrusion is contacted in the inside of the porous layer with the porous layer.

2. air cell anode according to claim 1,

The base portion has at least one opening,

The protrusion configures the region other than the opening of the 1st interarea.

3. air cell anode according to claim 1 or 2,

The porosity of the porous layer is 86% or more and 99% or less.

4. air cell anode described in any one of claim 1 to 3,

It is 1st pore and fine pore of the 4nm more than and less than 100nm is 100nm or more that the porous layer, which includes: fine pore, And 10 μm of the 2nd pores below,

Accumulation pore volume i.e. the 2nd pore volume of 2nd pore is thinner than accumulation pore volume i.e. the 1st of the 1st pore Pore volume is big.

5. air cell anode according to claim 4,

1st pore volume is 0.59cm³/ g is more than and less than 2.99cm³/g。

6. air cell anode according to any one of claims 1 to 5,

The porous layer includes: the carbon material and high molecular material as the conductive material.

7. air cell described according to claim 1~any one of 6 is positive,

The gross area of the cross section of the multiple protrusion is 2.0% or more relative to the area of the cross section of the porous layer And 7.0% hereinafter,

The gross area of the cross section of the protrusion is the heap with the base portion and the porous layer with the collector The sectional area of the multiple protrusion when the multiple protrusion of the vertical section on plane in folded direction it is total,

The area of the cross section of the porous layer is according to the Porous when porous layer described in the section on plane The section outer rim of layer and the area that finds out.

8. air cell anode according to any one of claims 1 to 7,

The protrusion runs through the porous layer.

9. air cell described according to claim 1~any one of 8 is positive,

The collector further includes sidewall portion,

The sidewall portion is set to the peripheral part of the 1st interarea of the base portion,

The height of the sidewall portion is higher than the height of the protrusion.

10. a kind of air cell, has:

Air cell according to any one of claims 1 to 9 anode,

Can absorb and release metal ion cathode and

Full of the electrolyte between the anode and the cathode.

11. air cell according to claim 10,

It is also equipped with the spacing body being configured between the anode and the cathode,

The spacing body configures in the electrolyte,

At least part of the multiple protrusion is contacted with the spacing body.

12. air cell described in 0 or 11 according to claim 1,

The electrolyte is non-aqueous electrolyte.

Technical field

The present invention relates to air cell anode and air cells.

Background technique

Air cell is with energy density (electricity that can be discharged relative to weight) height and miniaturization easy to accomplish and gently The advantage that quantization.Therefore, air cell is more than it is now recognized that the highest metal ion electricity of energy density as energy density The battery in pond and attract attention.

Air cell has anode, cathode and the electrolyte being configured between positive electrode and negative electrode.Anode for example has more Hole plastid and collector.Porous plastid is usually using carbon material.Collector is for example using metal mesh and metal lath etc..

Such as Patent Document 1 discloses a kind of air cell anode, have as anode layer Porous carbon and Foil-like, plate or netted etc. positive electrode collector.

Summary of the invention

The present invention provides a kind of air cell anode, may be implemented that high discharge capacity can be obtained and high weight energy is close The air cell of degree.

One scheme of the disclosure provides a kind of air cell anode, has collector and comprising the porous of conductive material Matter layer,

The collector includes multiple protrusions of base portion at least the 1st interarea for being configured at the base portion,

The 1st interarea of the base portion is plane,

The porous layer contiguously configures on the 1st interarea of the base portion with the 1st interarea,

The protrusion is contacted in the inside of the porous layer with the porous layer.

The air cell of the disclosure with anode may be implemented can to obtain high discharge capacity and high gravimetric energy density this two The air cell of person.

Detailed description of the invention

Fig. 1 is the schematic sectional view for showing a structural example of air cell for the disclosure.

Fig. 2 is the top view for schematically showing collector an example of air cell anode of the disclosure.

Fig. 3 is another structure of air cell of the disclosure that is showing another of the air cell anode including the disclosure The schematic sectional view of example.

Fig. 4 is another structure of air cell of the disclosure that is showing another of the air cell anode including the disclosure The schematic sectional view of example.

Fig. 5 is another structure of air cell of the disclosure that is showing another of the air cell anode including the disclosure The schematic sectional view of example.

Specific embodiment

<opinion as disclosure basis>

Air cell be using the oxygen in air as a positive electrode active material and use can absorb and release metal ion Battery as negative electrode active material of metal or compound.For as disclosed in Patent Document 1 by Porous carbon and anode The anode that collector is constituted, discharge capacity and gravimetric energy density are simultaneously insufficient.In patent document 1, it such is tied as above-mentioned The forming method of the anode of structure, discloses coating method and compression bonding method, coating method is that coating is coated on positive electrode collector Method, the coating be make the composition being made of Porous carbon and adhesive etc. dispersion in a solvent made of, crimping side Method is the compression bonding method that above-mentioned composition crimping is pressed on to positive electrode collector.The present inventor's new discovery is utilizing these methods The anode of formation can lead to the problem of following such.

In above-mentioned coating method, the combination composition deformation because of caused by the solvent-laden drying of coating institute is big, generates anode collection Electric body is difficult to obtain sufficient Nian Jie such problems with Porous carbon.It is bonding with Porous carbon insufficient in positive electrode collector In the case where, current collection destabilization, therefore discharge voltage reduces, it is difficult to obtain enough gravimetric energy densities.On the other hand, In In above-mentioned compression bonding method, when above-mentioned composition to be crimped on positive electrode collector, the major part of the pore of Porous carbon is generated Disappearance such problems due to pressure.If the pore of Porous carbon disappears, discharge capacity is reduced, and then current collection is also unstable Change, therefore discharge voltage reduces, gravimetric energy density reduces.

Therefore, the present inventor uses just the air cell that can be realized both high discharge capacity and high gravimetric energy density Pole and air cell have made intensive studies, it is contemplated that the air cell anode and air cell of the disclosure as shown below.

<summary of one form of the disclosure>

The air cell anode of the 1st form of the disclosure is that have collector and the porous layer comprising conductive material Air cell anode, the collector include that base portion and configuration are multiple prominent at least the 1st interarea of the base portion The portion of rising, the 1st interarea of the base portion are plane, the porous layer on the 1st interarea of the base portion with 1st interarea contiguously configures, and the protrusion is contacted in the inside of the porous layer with the porous layer.

The collector of the air cell anode of 1st form include be configured at it is multiple at least the 1st interarea of base portion Protrusion.The inside of porous layer of these protrusions on the 1st interarea for being configured at base portion is contacted with the porous layer.It changes Yan Zhi, it may be said that the construction that there is the anode of the 1st form the protrusion for constituting collector to be pierced into porous layer.In addition, Porous Layer is contacted with the 1st interarea as plane.According to the construction, between being present in the protrusion for constituting collector due to porous layer, Therefore collector is three-dimensionally be bonded with porous layer.Current collecting efficiency improves as a result, and response area is capable of increasing, therefore can be real Existing high gravimetric energy density.In addition, since collector includes protrusion, so as the method for forming anode, such as selecting Select by crimp pressing make porous layer and the integrated method of collector in the case where, due to protrusion assume responsibility for crimping by The a part for the pressure that porous layer is subject to when pressure, therefore be able to suppress the pore for including in porous layer and disappear.In addition, for The pressure of porous layer is applied to when assembling air cell with anode using the air cell of the 1st form and due to air electricity The internal pressure in pond and the pressure for being applied to porous layer, at least their a part can also be reduced by protrusion.It is as a result, Make in battery assembly and after being assembled in battery, is also able to suppress the pore for including in porous layer and disappears.Therefore, according to having The air cell anode of collector including protrusion as described above, can be realized the high discharge capacity of air cell.Cause This, the air cell of the 1st form can be realized both high discharge capacity and high gravimetric energy density with anode.

In the 2nd form, such as in the air cell anode of the 1st form, being also possible to the base portion has extremely A few opening, the protrusion configure the region other than the opening of the 1st interarea.

In the air cell anode of the 2nd form, the base portion of collector has opening, therefore current collecting efficiency improves, And then oxygen supply also becomes easy.Therefore, the air cell anode of the 2nd form can increase the amount of precipitation of discharge product, Further increase discharge capacity and gravimetric energy density.

It, can also in the air cell anode of the 3rd form, such as in the air cell anode of the 1st or the 2nd form To be the porosity of the porous layer for 86% or more and 99% or less.

In the air cell anode of the 3rd form, porous layer has 86% or more and 99% porosity below.It is logical It crosses and combines the porous layer with such porosity with the collector for including protrusion as described above, can effectively improve The discharge capacity of unit area.Therefore, the positive discharge capacity that unit area may be implemented of the air cell of the 3rd form is high Air cell.

In the 4th form, such as in the air cell anode of any of the 1st to the 3rd form form, it is also possible to The porous layer include fine pore be 4nm more than and less than the 1st pore of 100nm and fine pore be 100nm or more and 10 μm with Under the 2nd pore, accumulation pore volume of i.e. the 2nd pore volume of accumulation pore volume than the 1st pore of the 2nd pore I.e. the 1st pore volume is big.

The air cell anode of 4th form can more ensure oxygen to the diffusion path of anode and pass through exoelectrical reaction The storage space of the discharge product of generation.Therefore, the air cell of the 4th form is able to suppress with anode is drawn by discharge product The porous layer occlusion risen, and the amount of precipitation of discharge product can be increased.As a result, the air cell of the 4th form is used Anode is capable of increasing the discharge capacity of the unit area of air cell.

In the 5th form, such as in the air cell anode of the 4th form, being also possible to the 1st pore volume is 0.59cm³/ g is more than and less than 2.99cm³/g。

In the air cell anode of the 5th form, the response area for electrochemical reaction can be increased.Therefore, the 5th The air cell anode of form can promote the activation of oxygen, therefore can be realized the high capacity of air cell.

In the 6th form, such as in the air cell anode of any of the 1st to the 5th form form, it is also possible to The porous layer includes the carbon material and high molecular material as the conductive material.

In the air cell anode of the 6th form, area that porous layer can more keep oxygen that can react.Cause This can increase the amount of precipitation of discharge product, further increase discharge capacity in the air cell anode of the 6th form.

It is the multiple in the 7th form, such as in the air cell anode of any of the 1st to the 6th form form The gross area of the cross section of protrusion is 2.0% or more and 7.0% or less relative to the area of the cross section of the porous layer. Here, the gross area of the cross section of the protrusion is the heap with the base portion and the porous layer with the collector Total, the Porous of the sectional area of the multiple protrusion when the multiple protrusion of the vertical section on plane in folded direction Layer cross section area be according to the section outer rim of the porous layer when porous layer described in the section on plane and The area found out.In addition, being based on the porous layer described in the section on plane according to the area that the outer rim of porous layer is found out When porous layer outermost shape and the area that finds out, however not excluded that the area for the pore that the inside of porous layer is included. Here, the cross section of the protrusion refers to the section of the protrusion vertical with the stacking direction of base portion and porous layer.Separately Outside, the cross section of porous layer refers to the section of the porous layer vertical with the stacking direction of base portion and porous layer.In addition, In the case where the shape of the cross section of protrusion and/or size change along the stacking direction, as determining protrusion Cross section the gross area and porous layer cross section area when the plane that uses, using from base portion and Porous The plane that the position for 5% distance that the interface of layer moves porous layer thickness to porous layer side passes through.

The air cell anode of 7th form can substantially ensure that positive electrode collector is contacted with the three-dimensional of porous layer, In turn, can by because setting protrusion caused by porous plastid volume reduction be suppressed to it is smaller.By substantially ensuring anode Collector is contacted with the three-dimensional of porous layer, and current collecting efficiency improves, as a result, response area is capable of increasing.In addition, passing through The reduction of the volume of porous plastid is suppressed to smaller, can be realized oxygen being sufficiently fed to anode, and can also substantially ensure For storing the space of the discharge product generated by exoelectrical reaction.As a result, discharge capacity and gravimetric energy density energy Enough further increase.

In the 8th form, such as the protrusion of the air cell anode in any of the 1st to the 7th form form The porous layer can also be run through in portion.

In the air cell anode of the 8th form, such as positive electrode collector and Porous are being carried out by crimping pressing Be applied in the integrated situation of layer the pressure of porous layer, the pressure for being applied to when assembling air cell porous layer, And due to air cell internal pressure and be applied to the pressure of porous layer, can sufficiently be reduced by protrusion.Therefore, root According to the air cell anode of the 8th form, keep since the pore of the inside of porous layer is not crushed but more, It can be realized further increasing for discharge capacity.

In the 9th form, such as in the air cell anode of any of the 1st to the 8th form form, it is also possible to The collector further includes sidewall portion, and the sidewall portion is set to the peripheral part of the 1st interarea of the base portion, the side The height of wall portion is higher than the height of the protrusion.Here, the height of protrusion is including the 1st interarea comprising base portion The length of protrusion on direction that plane rises, vertical with the plane.In addition, the height of sidewall portion is from comprising base portion The length of sidewall portion on direction that plane including 1st interarea rises, vertical with the plane.

In the air cell anode of the 9th form, collector further includes sidewall portion, and the height of the sidewall portion compares protrusion Portion is high.The sidewall portion can further decrease the pressure for being applied to porous layer.Moreover, the sidewall portion can also prevent protrusion Breakage.Therefore, according to the air cell of the 9th form anode, the inner pore of porous layer, therefore energy are more effectively kept Enough realize further increasing for discharge capacity.

The air cell of 10th form of the disclosure has the air cell of any of the 1st to the 9th form form with just Pole, the cathode that can be absorbed and release metal ion and full of the electrolyte between the anode and the cathode.

In the air cell of the 10th form, have the air cell anode of any of the 1st to the 9th form form, Therefore both high discharge capacity and high gravimetric energy density can be obtained.

In the 11st form, for example, be also possible to the 10th form air cell be also equipped be configured at it is described anode with it is described Spacing body between cathode, spacing body configuration in the electrolyte, at least part of the multiple protrusion with it is described every Part contact.

The air cell of 11st form has spacing body, therefore has high security.

In the 12nd form, such as in the air cell of the 10th or the 11st form, the electrolyte is non-water system electrolysis Liquid.

The air cell of 12nd form can be improved voltage, can be improved gravimetric energy density.

<embodiment>

Hereinafter, the embodiment of air cell anode and air cell to the disclosure is described in detail.In addition, with Under embodiment be an example, the disclosure is not limited to following form.

The air cell of present embodiment has air cell anode (being recorded as " anode " below), can absorb and put The electrolyte of the cathode of metal ion and configuration between positive electrode and negative electrode out.Anode has collector and comprising electric conductivity The porous layer of material.The oxygen as positive active material and can be carried out redox as using the oxygen in air by porous layer Anode layer and be arranged.The current collection of collector progress porous layer.Cathode includes the cathode that can absorb and release metal ion Layer.Cathode can also include the negative electrode collector for carrying out the current collection of negative electrode layer.The air cell of present embodiment can also have The spacing body being configured between positive electrode and negative electrode.

In the anode of present embodiment, collector includes base portion and configuration at least the 1st interarea of the base portion Multiple protrusions.1st interarea of base portion is plane.Base portion is also possible to tabular.That is, being also possible to base portion tool There are the 1st interarea and the 2nd interarea with the 1st interarea opposite side, the 2nd interarea is plane.Alternatively, the 2nd interarea may not be it is flat Face.Hereinafter, being illustrated to flat base portion.Porous layer configures on the 1st interarea of base portion.Protrusion is porous The inside of matter layer is contacted with the porous layer.In other words, it may be said that there is anode the protrusion for constituting collector to be pierced into Porous The structure of layer.In the present embodiment, protrusion is along from the 1st interarea of flat base portion towards the direction of porous layer Part outstanding, such as with columnar shape.

The schematic sectional view of a structural example of air cell as described above is shown in FIG. 1.

Air cell 1 illustrated by Fig. 1 has battery case 11, cathode 12, anode 13 and electrolyte 14.Electrolyte 14 Configuration is between cathode 12 and anode 13.Battery case 11 has: the cylindrical portion of upper surface side and bottom surface side both sides opening 11a, bottom surface side to block cylindrical portion 11a opening in a manner of the bottom 11b that is arranged and to block the upper of cylindrical portion 11a The cover 11c that the mode of the opening of surface side is arranged.In addition, although it is not shown, but battery case 11 have introduced in inside it is empty The structure of gas.For example, it is also possible to which the air introducing holes for introducing air into battery case 11 are arranged in cover 11c.It is negative Pole 12 is made of negative electrode layer 121 and negative electrode collector 122.Negative electrode layer 121 is configured relative to negative electrode collector 122 in electrolyte 14 Side.Anode 13 is made of porous layer 131 and positive electrode collector 132.Porous layer 131 is configured relative to positive electrode collector 132 In 14 side of electrolyte.Porous layer 131 includes conductive material, is functioned as anode layer.Positive electrode collector 132 is by plate The base portion 132a of shape and the multiple columnar protrusion 132b being configured on the 1st interarea 15 of base portion 132a are constituted.Though not Diagram, but the base portion 132a of positive electrode collector 132 is provided with the air for introducing air into porous layer 131 and introduces Hole.For example, the opening can be functioned as air introducing holes in the case where base portion 132a has opening.In addition, In The side for the laminated body being made of cathode 12, electrolyte 14 and anode 13 is provided with framework 16.In addition, although not shown, but air Battery 1 can also have spacing body included by electrolyte 14.

Hereinafter, air cell an example as present embodiment, is illustrated lithium-air battery.But this embodiment party The air cell of formula is not limited to lithium-air battery, is also possible to the air cell using the metal other than lithium.

In the case where the air cell of present embodiment is lithium-air battery, cell reaction is as described below.

Exoelectrical reaction (when battery uses)

Cathode: 2Li → 2Li⁺+2e^-(1)

Anode: 2Li⁺+2e^-+O₂→Li₂O₂(2)

Charging reaction (when battery charges)

Cathode: 2Li⁺+2e^-→2Li(3)

Anode: Li₂O₂→2Li⁺+2e^-+O₂(4)

In electric discharge, as shown in formula (1) and (2), on the other hand draw in anode from cathode ejected electron and lithium ion Enter electronics, while the oxygen and lithium ion that introduce from outside batteries react and generates lithium peroxide.In lithium-air battery In the case of, which is discharge product.In addition, charging when, as shown in formula (3) and (4), in cathode with electronics It is concomitantly introduced into lithium ion, releases lithium ion and oxygen together with electronics in anode.In addition, lithium peroxide also can be generated in air cell Oxidate for lithium (such as Li other than compound₂O) it is used as discharge product.

Then, each structure of such air cell is described in detail.

1. anode

As described above, anode includes positive electrode collector and the porous layer comprising conductive material.As described above, Porous Layer as positive active material and can function the redox anode layer of oxygen progress as using the oxygen in air.With Under, porous layer and positive electrode collector are illustrated respectively.

(1) porous layer

Porous layer includes that using the oxygen in air as positive active material and the oxygen can be carried out redox material. As such material, the porous layer in present embodiment includes the conductive porous plastid containing carbon.As such more The carbon material of hole plastid also can have high electronic conductivity.It is usually used specifically, being also possible to acetylene black and Ketjen black etc. Make the carbon material of conductive auxiliary agent.In these carbon materials, from specific surface area aspect, the electric conductivity charcoal such as Ketjen black can be used It is black.The specific surface area of carbon material for example can be 800m²/ g~2000m²/ g, or 1200m²/ g~1600m²/g.Separately Outside, DBP (dibutyl phthalate) oil absorption of carbon material can be 150mL/100g~600mL/100g, or 300mL/100g~500mL/100g.By the way that the specific surface area of carbon material and DBP oil absorption to be located in such range, it is easy Form the porous layer with aftermentioned characteristic pore construction.In addition, specific surface area herein is measured by BET method Value.In addition, DBP oil absorption can be measured according to the JIS K 6217-4 of JIS standard.

The porosity of porous layer can be 86% or more and 99% or less.The porosity of porous layer can for 88% with On, or 89% or more.The porosity of porous layer can be 95% or less, or 90% or less.It is more by making Hole matter layer has such porosity, can promote the diffusion of the oxygen and ion in porous layer.As a result, can be to porous Matter layer efficiency supplies ion and oxygen well, improves discharge capacity.In addition, the porosity of porous layer is able to use porous layer Apparent volume, porous layer quality and constitute the real density of material of porous layer and find out.Porous layer it is apparent Volume is that the pore volume for being included is also included within interior volume by the inside of porous layer.Therefore, the apparent body of porous layer The apparent area that thickness of the product according to porous layer and the interarea outer rim from porous layer are found out is found out.

It is 4nm or more and 10 μm of pore below that porous layer, which may include aperture,.Here, being 4nm or more by fine pore And the pore less than 100nm is defined as the 1st pore, is that 100nm or more and 10 μm of pore below is defined as the 2nd carefully by fine pore Hole.Moreover, the accumulation pore volume of the 1st pore is defined as the 1st pore volume, the accumulation pore volume of the 2nd pore is defined For the 2nd pore volume.In the present embodiment, in porous layer, the 2nd pore volume can be bigger than the 1st pore volume.That is, In the pore volume of porous layer, compared to the ratio occupied by the 1st pore with small-bore, by having more large aperture The ratio that 2nd pore occupies can be bigger.

As long as porous layer has the porous plastid, but can also further contain and fix the porous plastid The adhesive of change.As adhesive, adhesive of the well known materials as the anode layer of air cell can be used, such as can arrange Lift the high molecular materials such as Kynoar (PVdF) and polytetrafluoroethylene (PTFE) (PTFE).Binder content in porous layer is without spy It does not limit, such as can be in the range of the 1 mass % of mass %~40.

The thickness of porous layer is different according to purposes of air cell etc., therefore is not particularly limited, such as can be 2 It, can also be in the range of 5 μm to 300 μm μm in the range of 500 μm.

As the forming method of porous layer, following method can be used for example.For example, to the more of porous layer will be constituted Coating made of raw material, adhesive and the sublimability powder of hole plastid disperse in a solvent forms a film.Hot place is carried out to the film Reason is to remove sublimability powder and solvent.As a result, forming the multiple aperture plasma membrane for having the pore with expected aperture.By adopting With multiple aperture plasma membrane crimping is for example pressed on the method etc. on positive electrode collector described below, porous layer can be manufactured. Sublimability powder is functioned as pore creating material.Therefore, the multiple aperture plasma membrane energy made as described above using sublimability powder It is enough to realize expected pore construction.

In addition, as described above, porous layer is functioned as anode layer.But in the anode of air cell, due to Oxygen in air is functioned as active material, therefore porous layer can also not contain active material.Therefore, from different sights Point sets out, and porous layer can be regarded as the structure that a part as collector, i.e. the 2nd collector functions.

(2) positive electrode collector

The current collection of positive electrode collector progress porous layer.Therefore, as the material of positive electrode collector, as long as having conduction The material of property is just not particularly limited, and positive electrode collector of the well known materials as air cell can be used.As positive pole current collections The example of the material of body, such as stainless steel, nickel, aluminium, iron, titanium and carbon can be enumerated etc..

As described above, positive electrode collector includes base portion and multiple protrusions for being configured at least the 1st interarea of base portion Portion.1st interarea is plane.Base portion and protrusion can be formed from the same material, and can also be formed by mutually different material.

Base portion for example can be foil-like and plate etc..In addition, base portion also can have at least one opening.Base portion It can have sieve (such as grid) construction.In the case where base portion has opening, positive electrode collector can be realized excellent Current collecting efficiency and excellent oxygen supply ability.The thickness of the base portion of positive electrode collector for example can be in 10 μm to 1000 μm of model It, can also be in the range of 20 μm to 400 μm in enclosing.

As described above, protrusion is outstanding along the direction of the 1st interarea towards the porous layer from flat base portion Part, such as with columnar shape.In addition, protrusion relative to porous layer thickness have such as 10% or more and 1000% height below.It is put down in addition, the height of protrusion refers to from the plane including the 1st interarea of base portion to this The length of protrusion on the vertical direction in face.The height of protrusion for example can relative to porous layer with a thickness of 30% with On, or 50% or more.In addition, the height of protrusion for example can relative to porous layer with a thickness of 500% hereinafter, Or 200% or less.

The height of protrusion can be roughly the same with the thickness of porous layer, can also be more than the thickness of porous layer.This Outside, the height of protrusion is more than the thickness of porous layer, is protrusion through porous layer in other words.In the height of protrusion In the case that roughly the same or protrusion runs through porous layer with the thickness of porous layer, such as even if pass through crimping pressing Progress positive electrode collector is integrated with porous layer, and the pore inside porous layer will not be crushed but more protect It holds.The reason for this is that bearing most of pressure when crimping pressing due to protrusion, therefore, it is difficult to apply big pressure to porous layer Power.Moreover, be applied to when assembling air cell porous layer pressure and due to air cell internal pressure and apply In the pressure of porous layer, also can fully be reduced by protrusion.Keep porous while effectively carrying out current collection as a result, The sufficient pore of matter layer, therefore can be realized further increasing for discharge capacity and gravimetric energy density.

The gross area of the cross section of multiple protrusions can be 2.0% or more relative to the area of the cross section of porous layer And 7.0% or less.Here, the gross area of the cross section of protrusion is with the base portion and porous layer relative to positive electrode collector Stacking direction vertical section on plane multiple protrusions when multiple protrusions sectional area it is total.Porous layer it is transversal The area in face is to split porous layer from the plane (plane used when determining the gross area of the cross section of protrusion) When porous layer the area that finds out of section outer rim.In addition, from the area that porous layer outer rim is found out being based on described flat The outermost shape of porous layer when the porous layer is splitted in face and the area found out, however not excluded that wrapped inside porous layer The pore area contained.In addition, the case where shape and/or size in the cross section of protrusion change along the stacking direction Under, the plane that when area of the cross section as the gross area and porous layer in the cross section for determining protrusion uses makes Position at a distance from move porous layer thickness to porous layer side with the interface of porous layer from base portion 5% is logical The plane crossed.

By making the gross area of the cross section of multiple protrusions exist relative to the ratio of the area of the cross section of porous layer In the range, can substantially ensure that positive electrode collector is contacted with the three-dimensional of porous layer, in turn, can will because be arranged protrusion The volume reduction of porous plastid caused by portion is suppressed to smaller.By the solid for substantially ensuring positive electrode collector and porous layer Property contact, current collecting efficiency improve, as a result, response area is capable of increasing.In addition, by the way that the volume of porous plastid is reduced suppression Be made as it is smaller, can be realized oxygen to anode being sufficiently fed, and can also substantially ensure for store by exoelectrical reaction give birth to At discharge product space.As a result, discharge capacity and gravimetric energy density can further increase.

The allocation position and its quantity of protrusion are not particularly limited.Protrusion can be only fitted to the peripheral part of base portion, Also it can be only fitted to the center portion of base portion.The 1st interarea that protrusion can equably be configured at base portion is whole, can also be with Only it is configured at the specific region of the 1st interarea.

Positive electrode collector can also include sidewall portion, the sidewall portion be set to the peripheral part of the 1st interarea of base portion and It is prominent towards cathode.The height of sidewall portion can be higher than the height of protrusion.The sidewall portion can further decrease be applied to it is more The pressure of hole matter layer.Moreover, the sidewall portion can also prevent the breakage of protrusion.Therefore, according to such sidewall portion Positive electrode collector can more effectively keep the pore inside porous layer, therefore can be realized further mentioning for discharge capacity It is high.

Fig. 2 shows an examples of positive electrode collector structure.In addition, Fig. 2 is to schematically show positive electrode collector shown in Fig. 1 The top view of 132 an example.In positive electrode collector 132 shown in Fig. 2, base portion 132a has opening.Protrusion 132b matches Set the region other than the opening of base portion 132a.In the example shown in Fig. 2, base portion 132a is clathrate, is handed in grid Point part is configured with protrusion 132b.In addition, the cross section outer rim of base portion 132a is circle.Here, cross section refers to relatively In the vertical section of the stacking direction of base portion 132a and porous layer 131.But these are an examples of positive electrode collector 132, It's not limited to that for the shape of base portion 132a and the shape of protrusion and allocation position.The cross section outer rim of base portion 132a Such as the shape other than to be also possible to quadrangle etc. round.In addition, the opening shape of base portion 132a is not limited to shown in Fig. 2 Quadrangle, such as be also possible to diamond shape etc..The shape of protrusion 132b shown in Fig. 2 is cylinder, and but not limited to this, can also To be the prisms such as triangular prism and quadrangular, it is also possible to cone or frustum.As long as in addition, the region of configuration protrusion 132b Region other than the opening of base portion 132a, therefore it is also possible to the region other than lattice intersection part.

In the example depicted in figure 1, the height of protrusion 132b is roughly the same with the thickness of porous layer 131.But it is prominent Rise portion 132b height can also thickness as shown in Figure 3 than porous layer 131 it is small.In addition, as shown in figure 4, protrusion The height of 132b can also be more than the thickness of porous layer 131, i.e. protrusion 132b runs through porous layer 131.

Fig. 5 shows the example that positive electrode collector 132 above-mentioned further includes the structure of sidewall portion 132c.In this example embodiment, side Wall portion 132c is set to the peripheral part of the 1st interarea 15 of base portion 132a, and prominent towards cathode 12.The height of sidewall portion 132c It is higher than the height of protrusion 132b.

Positive electrode collector can configure porous layer on two interareas of base portion.That is, in base portion and the 1st interarea On 2nd interarea of opposite side, it can also further be provided as the porous layer that anode layer functions.In base portion In the case that porous layer is set on two interareas, multiple protrusions can also be set in the 2nd interarea of base portion.In addition, with Similarly, the protrusion for being set to the 2nd interarea can also be on being configured at the 2nd interarea for the protrusion for being set to the 1st interarea The inside of porous layer contacted with the porous layer.In addition, be set to the protrusion of the 2nd interarea also can be set to it is aforementioned The protrusion of the 1st interarea similarly define.

In the case where the base portion of positive electrode collector has opening, the air cell of present embodiment can also have pair By having the charge of the base portion current collection of opening to carry out the other positive electrode collector (such as collector of foil-like) of current collection.At this In embodiment, aftermentioned battery case can also have both the function of other positive electrode collectors.

The manufacturing method of positive electrode collector is not particularly limited, such as can be made by photo-engraving process etc..

2. cathode

As described above, cathode includes negative electrode layer, it can also include negative electrode collector.Hereinafter, respectively to negative electrode layer and cathode Collector is illustrated.

(1) negative electrode layer

Negative electrode layer in present embodiment at least contains the negative electrode active material that can absorb and release lithium ion.As this The negative electrode active material of sample, is not particularly limited as long as the substance containing elemental lithium, such as can enumerate metal simple-substance (gold Belong to lithium), the alloy containing elemental lithium, the oxide containing elemental lithium and the nitride containing elemental lithium etc..As with lithium member The alloy of element, such as lithium-aluminium alloy, lithium-tin alloy, Li-Pb alloy and Li-Si alloy can be enumerated etc..In addition, as lithium member is contained The metal oxide of element, such as Li-Ti oxide can be enumerated etc..In addition, as the metal nitride containing elemental lithium, such as Lithium cobalt nitride, lithium iron-nitride and lithium manganese nitride etc. can be enumerated.

Negative electrode layer can only contain negative electrode active material, and adhesive can also be also contained other than negative electrode active material. For example, negative electrode layer only containing negative electrode active material can be formed in the case where negative electrode active material is foil-like.Another party Face can form the negative electrode layer with negative electrode active material and adhesive in the case where negative electrode active material is powdered.Make For adhesive, adhesive of the well known materials as the negative electrode layer of lithium-air battery can be used, for example, can enumerate PVdF and PTFE etc..The content of adhesive in negative electrode layer is not particularly limited, such as can be in 1 mass % to the range of 40 mass % It is interior.In addition, the forming method as the method for using powdered negative electrode active material to form negative electrode layer, with above-mentioned porous layer Likewise it is possible to use the forming method etc. based on scraper method or crimping pressing.

(2) negative electrode collector

The current collection of negative electrode collector progress negative electrode layer.As the material of negative electrode collector, as long as conductive material Material is just not particularly limited, and negative electrode collector of the well known materials as air cell can be used.Material as negative electrode collector The example of material, such as copper, stainless steel, nickel and carbon can be enumerated etc..As the shape of negative electrode collector, such as foil can be enumerated Shape, plate and sieve (such as grid) shape etc..In the present embodiment, aftermentioned battery case can also have both negative electrode collector Function.

3. spacing body

The lithium-air battery of present embodiment can have the spacing body configured between positive electrode and negative electrode.By anode with Spacing body is configured between cathode, can obtain highly-safe battery.As spacing body, as long as having porous layer and negative electrode layer electricity Isolated function is just not particularly limited, such as perforated membranes, PE and the PP such as polyethylene (PE) and polypropylene (PP) can be enumerated etc. Porous insulating materials such as resin non-woven fabrics, glass fibre non-woven and non-woven fabrics made of paper etc..

The porosity of spacing body can be in the range of 30% to 90%.In the case where porosity is less than 30%, make every In the case that part keeps electrolyte, spacing body is possible to be difficult to sufficiently to keep electrolyte.On the other hand, if porosity is more than 90%, It is then possible to be unable to get sufficient spacing body intensity.The porosity of spacing body can be 35% to 60%.

Spacing body can be only fitted in electrolyte.In this case, at least part of multiple protrusions of positive electrode collector It can also be contacted with spacing body.

4. electrolyte

Electrolyte configures between positive electrode and negative electrode, carries out the conduction of lithium ion.Therefore, as long as electrolyte have lithium from The conductive substance (lithium ion conduction body) of son, form is not particularly limited, and can be the organic solvent containing lithium salts Any one of solid membrane system representated by solution system representated by system and the polymer solid electrolyte system containing lithium salts.

Electrolyte be solution system in the case where, can be used by nonaqueous solvents dissolve lithium salts and modulate it is non-aqueous It is electrolyte as electrolyte.

As the lithium salts that non-aqueous electrolyte is included, such as lithium perchlorate (LiClO can be enumerated₄), lithium hexafluoro phosphate (LiPF₆), LiBF4 (LiBF4), trifluoromethayl sulfonic acid lithium (LiCF₃SO₃) and double trifyl amide lithium (LiN (CF₃SO₂)₂) etc., but not limited to this, and electrolysis of the well known lithium salts as the non-aqueous electrolyte of air cell can be used Matter.

Electrolyte phase is, for example, 0.5 mole/L to 2.5 moles/L for the meltage of nonaqueous solvents.In addition, using molten In the case where liquid system electrolyte (non-aqueous electrolyte), as described above, can be by making the non-aqueous electrolyte be impregnated in spacing body And it keeps to form electrolyte.

As nonaqueous solvents, well known nonaqueous solvents can be used as the non-aqueous of the non-aqueous electrolyte of air cell Agent.Wherein, it is particularly possible to use the chains ether such as tetraethyleneglycol dimethyl ether as solvent.This is because with carbonate-based solvent phase Than chain ether is not susceptible to the side reaction other than the redox reaction of the oxygen in anode.

5. battery case

As long as the battery case of the air cell of present embodiment can store anode, cathode and electrolyte above-mentioned i.e. Can, therefore be not particularly limited.Therefore, the battery case of the air cell of present embodiment is not limited to electricity shown in FIG. 1 Pond shell 11 is able to use the various battery cases such as Coin shape, plate, cylinder type and laminated-type.In addition, battery case can To be battery case of the battery case but it is also possible to be hermetic type of atmosphere opening type.In addition, the battery case of atmosphere opening type Refer to the shell that can be contacted with anode with the ventilation opening and atmosphere that can be entered and left for atmosphere.On the other hand, in hermetic type electricity In the case where the shell of pond, the supply pipe and discharge pipe of gas (such as air) can also be set on enclosed-type battery shell. In this case, the gas for supplying and being discharged is also possible to dry gas.The oxygen concentration of the gas can be higher, can also be with For pure oxygen (99.999%).Alternatively, it is also possible to improve oxygen concentration in electric discharge, oxygen concentration is reduced in charging.

In addition, as described above, in the present embodiment, having been carried out in detail in case where air cell is lithium-air battery Describing bright but of the invention air cell in detail can also apply to the air electricity of other metals such as sodium air cell and magnesium air battery Pond.