阅读说明：本技术 一种柔性电极的制备方法及其应用 (Preparation method and application of flexible electrode ) 是由 谢冲 李喜飞 于 2020-03-09 设计创作，主要内容包括：本发明公开了一种柔性电极的制备方法,具体按照以下步骤实施：步骤1、制备单分散的碳纳米管氯磺酸溶液；步骤2、向碳纳米管氯磺酸溶液中加入活性材料并搅拌均匀得电极浆料；步骤3、将极浆料均匀地涂覆在衬底上,经固化、清洗、干燥后得到柔性电极。本发明还公开了该方法制备的柔性电极及其应用。本发明的有益效果在于：(1)碳纳米管和活性材料在浆料中分散均匀,且碳纳米管能够实现单分散,提高柔性电极的机械性能和电化学性能；(2)柔性电极中不包含导电添加剂、聚合物粘结剂等惰性组成,可有效提高柔性电极的能量密度；活性材料的选取具有一定的普适性；(3)制备方法简单易行,且该技术适合于工业化生产。(The invention discloses a preparation method of a flexible electrode, which is implemented according to the following steps: step 1, preparing a monodisperse carbon nano tube chlorosulfonic acid solution; step 2, adding an active material into the carbon nano tube chlorosulfonic acid solution and uniformly stirring to obtain electrode slurry; and 3, uniformly coating the electrode slurry on a substrate, and curing, cleaning and drying to obtain the flexible electrode. The invention also discloses the flexible electrode prepared by the method and application thereof. The invention has the beneficial effects that: (1) the carbon nano tube and the active material are uniformly dispersed in the slurry, and the carbon nano tube can realize monodispersion, so that the mechanical property and the electrochemical property of the flexible electrode are improved; (2) the flexible electrode does not contain inert components such as conductive additives, polymer binders and the like, so that the energy density of the flexible electrode can be effectively improved; the selection of the active material has certain universality; (3) the preparation method is simple and easy to implement, and the technology is suitable for industrial production.)

1. The preparation method of the flexible electrode is characterized by comprising the following steps:

step 1, dispersing carbon nano tubes in chlorosulfonic acid solution to obtain monodisperse carbon nano tube chlorosulfonic acid solution;

step 2, adding an active material into the carbon nano tube chlorosulfonic acid solution and uniformly stirring to obtain electrode slurry;

and 3, uniformly coating the electrode slurry on the substrate by adopting a blade coating method or a roll-to-roll method, and curing, cleaning and drying to obtain the flexible electrode.

2. The method for preparing a flexible electrode according to claim 1, wherein in the step 1, the mass fraction of the carbon nanotubes is 0.01 to 10 wt%.

3. The method for preparing the flexible electrode according to claim 1, wherein in the step 2, the mass ratio of the active material to the carbon nanotubes is 1: 20-20: 1.

4. The method as claimed in claim 1, wherein in the step 2, the active material is selected from the group consisting of a simple substance, a compound, and a composite material that does not react with chlorosulfonic acid.

5. The method of claim 4, wherein in step 2, the active material is one of Si @ C, S @ C, P @ C.

6. A flexible electrode produced by the production method according to any one of claims 1 to 5.

7. The use of a flexible electrode according to claim 6 in a power supply.

8. Use of the flexible electrode of claim 7 in a lithium ion battery.

9. The flexible electrode of claim 7, used in a sodium ion battery.

10. The use of the flexible electrode of claim 7 in a potassium ion battery.

Technical Field

The invention belongs to the technical field of electrode preparation, and particularly relates to a preparation method of a flexible electrode and application of the flexible electrode prepared by the method.

Background

In recent years, wearable electronic devices have become an important component of people's daily life. Conventional batteries have the disadvantages of being heavy, rigid, etc., and are difficult to meet the requirements of these devices. Therefore, it is urgently needed to develop a portable and flexible power source (battery, super capacitor, etc.) to match with it as a power source. As one of the key components of the power supply, the development of flexible electrodes is crucial.

Flexible electrodes are primarily composed of a "rigid" active material and a "flexible" base material. Wherein the active material provides the volume and the base material provides the mechanical support and the conductive network. The flexible electrode should have both good electrochemical and mechanical properties. Carbon nanotubes have excellent thermal stability, chemical stability, good electrical conductivity and mechanical properties, and are considered to be one of the best candidate substrate materials for fabricating flexible electrodes. In the flexible electrode, the mechanical property and the electrochemical property of the flexible electrode can be directly influenced by the dispersion uniformity of the carbon nanotubes and the active material. Due to the unique one-dimensional tubular structure of carbon nanotubes, it is difficult to obtain a uniformly dispersed, high concentration (suitable viscosity) carbon nanotube/active material composite slurry. Therefore, the main methods for preparing the flexible electrode at present are a vacuum filtration method, an electrostatic spinning method and the like, and the flexible electrode which takes the carbon nano tube as the substrate and has both electrochemical performance and mechanical performance is difficult to prepare by adopting an industrially common knife coating method or a pair roller method.

Disclosure of Invention

The invention aims to provide a preparation method of a flexible electrode, which solves the problem that the flexible electrode prepared by the prior art and taking a carbon nano tube as a substrate can not give consideration to both electrochemical performance and mechanical property.

The technical scheme adopted by the invention is that the preparation method of the flexible electrode is implemented according to the following steps:

step 1, dispersing carbon nano tubes in chlorosulfonic acid solution to obtain monodisperse carbon nano tube chlorosulfonic acid solution;

step 2, adding an active material into the carbon nano tube chlorosulfonic acid solution and uniformly stirring to obtain electrode slurry;

and 3, uniformly coating the electrode slurry on the substrate by adopting a blade coating method or a roll-to-roll method, and curing, cleaning and drying to obtain the flexible electrode.

The invention is also characterized in that:

in the step 1, the mass fraction of the carbon nano tube is 0.01-10 wt.%;

in the step 2, the mass ratio of the active material to the carbon nano tube is 1: 20-20: 1.

In the step 2, the active material is a simple substance, a compound or a composite material which does not react with chlorosulfonic acid.

In step 2, the active material includes but is not limited to one of Si @ C, S @ C, P @ C.

Another object of the present invention is to provide a flexible electrode prepared by the above method.

A third object of the invention is to provide a use of the flexible electrode.

The flexible electrode is applied in a power supply.

The invention is also characterized in that:

the flexible electrode is applied to a lithium ion battery.

The flexible electrode is applied to a sodium ion battery.

The flexible electrode is applied to a potassium ion battery.

The invention has the beneficial effects that: (1) the carbon nano tube and the active material are uniformly dispersed in the slurry, the carbon nano tube can realize monodispersion, and the mechanical property and the electrochemical property of the flexible electrode can be improved by the uniform dispersion of the carbon nano tube and the active material; (2) the flexible electrode does not contain inert components such as conductive additives, polymer binders and the like, so that the energy density of the flexible electrode can be effectively improved; (3) the active material has certain universality, and simple substances, compounds and composite materials which do not react with chlorosulfonic acid can be used as the active material; (4) the preparation method is simple and easy to implement, and the technology is suitable for industrial production.

Drawings

FIG. 1 is a flow chart of the preparation method and application of a flexible electrode according to the present invention;

FIG. 2 is a scanning electron microscope image of a flexible electrode in the method for manufacturing the flexible electrode and the application thereof according to the present invention;

FIG. 3 is an optical electron microscope image of a flexible electrode in the manufacturing method and application of the flexible electrode of the present invention;

FIG. 4 is a graph of the mechanical properties of a flexible electrode in accordance with the present invention;

FIG. 5 is a diagram of the lithium storage performance of a flexible electrode applied to a lithium ion battery in a method for manufacturing the flexible electrode and the application thereof according to the present invention;

FIG. 6 is a diagram illustrating the lithium storage performance of a flexible electrode applied to a lithium sulfur battery according to a method of manufacturing the flexible electrode and the application thereof;

FIG. 7 is a diagram of the sodium storage performance of a flexible electrode applied to a sodium ion battery according to a method for manufacturing the flexible electrode and the application thereof;

fig. 8 is a potassium storage performance diagram of the flexible electrode applied to a potassium ion battery in the preparation method and the application of the flexible electrode of the invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention discloses a preparation method of a flexible electrode, which is implemented according to the following steps as shown in figure 1:

step 1, dispersing carbon nano tubes in chlorosulfonic acid solution to obtain monodisperse carbon nano tube chlorosulfonic acid solution;

and 2, adding an active material into the carbon nano tube chlorosulfonic acid solution, and uniformly stirring to obtain the electrode slurry, wherein the active material is a simple substance, a compound and a composite material which do not react with chlorosulfonic acid, and the active material comprises but is not limited to one of Si @ C, S @ C, P @ C.

Step 3, uniformly coating the electrode slurry on a substrate by adopting a blade coating method or a roll-to-roll method, and obtaining a flexible electrode after curing, cleaning and drying;

preferably, the mass ratio of the active material to the carbon nano tube is 1: 20-20: 1;

preferably, the mass fraction of the carbon nanotubes is 0.01-10 wt.%;

wherein the substrate may be a thin sheet of polytetrafluoroethylene or other flexible substance.