CN-122029639-A - Electrode preparation method, electrode and battery

Abstract

The application provides a preparation method of an electrode, which comprises the following steps of S1, adding an electrode active material, a conductive agent and binder fibers into a container, stirring to form a mixed material, and S2, arranging the mixed material on a carrier to form the electrode. The application also provides an electrode and a battery. The electrode preparation method does not contain solvent in the mixed material, does not need to bake the electrode, reduces the energy consumption loss of equipment, mixes the fiberized binder with the electrode active material and the conductive agent, does not need to carry out the fiberization treatment on the electrode active material, can prevent the reduction of the battery capacity caused by the breakage of active material particles, and has universality.

Inventors

• QIN SHILIN
• YI JIANGPING

Assignees

• 微宏动力系统（湖州）有限公司
• 微宏公司

Dates

Publication Date

20260512

Application Date

20240226

Priority Date

20240122

Claims (13)

1. A method of preparing an electrode, comprising the steps of: S1, adding an electrode active material, a conductive agent and binder fibers into a container, and stirring to form a mixed material; And S2, arranging the mixed material on a carrier to form an electrode.
2. The method of manufacturing an electrode according to claim 1, wherein in the step S1, the mass fraction of the electrode active material in the mixed material is 80wt% to 98wt%, the mass fraction of the conductive agent is 1wt% to 10wt%, and the mass fraction of the binder fiber is 1wt wt% to 10wt%.
3. The method of preparing an electrode according to claim 1, wherein in the step S1, the electrode active material is a positive electrode active material, and the positive electrode active material is one or more of lithium cobaltate, lithium manganate, lithium nickelate cobalt, and lithium iron phosphate.
4. The method of manufacturing an electrode according to claim 1, wherein in the step S1, the electrode active material is a negative electrode active material, and the negative electrode active material is one or more of graphite, silicon oxide, lithium silicon alloy, and metallic lithium powder.
5. The method of preparing an electrode according to claim 1, wherein in the step S1, the conductive agent is one or more of acetylene black, super-P, carbon nanotubes, graphite and graphene.
6. The method of claim 1, wherein in the step S1, the binder fiber is one or more of PTFE, PVDF, SBR, CMC, PP, PE, PI and EVA.
7. The method of manufacturing an electrode according to claim 1, wherein in the step S1, the electrode active material and the conductive agent are placed in the container, and the binder fiber is added to the container and stirred to form the mixed material.
8. The method of manufacturing an electrode according to claim 1, wherein in the step S1, the electrode active material and the conductive agent are placed in the container and stirred once, the binder fiber is added to the container, and the mixture is formed by stirring twice during the process of adding the binder fiber to the container.
9. The method of preparing an electrode according to claim 8, wherein in the step S1, three times of stirring are further performed after the binder fiber is completely added to the container.
10. The method for preparing an electrode according to any one of claims 1 to 9, wherein in the step S1, the method for preparing the binder fiber comprises the steps of: Dispersing the binder in a solvent to prepare a binder spinning solution, and forming the binder fiber by the binder spinning solution through an electrostatic spinning process.
11. The method of preparing an electrode of claim 10, wherein the binder dope has a solids content of 5% to 30%.
12. An electrode prepared by the method of any one of claims 1-11.
13. A battery comprising the electrode of claim 12.

Description

Electrode preparation method, electrode and battery Technical Field The application relates to the technical field of lithium ion battery manufacturing, in particular to an electrode preparation method, an electrode and a battery. Background The lithium ion battery has the advantages of high capacity, high energy density, low self-discharge rate, environmental protection and the like, and has wide application in the fields of electric vehicles, portable electronic equipment, large-scale energy storage systems and the like. In the manufacturing process of the pole piece of the lithium ion battery, two processes of wet coating and dry coating exist. The wet coating process is to uniformly mix an electrode active material, a conductive agent, a binder and a solvent (such as organic solvent NMP) to prepare a mixed slurry, and then to coat the mixed slurry on a current collector. The dry coating process does not use a solvent, and the electrode active material, the conductive agent and the binder are directly mixed uniformly to prepare a mixed material, so that the mixed material is uniformly dispersed and covered on the current collector, or the mixed material is fibrillated and then covered on the current collector. Drawings Fig. 1 is an SEM image of the surface of a pole piece prepared in example 1 of the present application. Fig. 2 is an SEM image of the surface of the pole piece prepared in comparative example 1 of the present application. FIG. 3 is a schematic diagram showing the preparation process of the mixed materials in examples 1 and 2 of the present application. Embodiments of the invention The following describes in further detail the embodiments of the present application with reference to the drawings and examples. The following examples are illustrative of the application and are not intended to limit the scope of the application. The embodiment of the application provides an electrode preparation method, which comprises the following steps: S1, adding an electrode active material, a conductive agent and binder fibers into a container, and stirring to form a mixed material, wherein the stirring time is 1-120min or 30-60min. And S2, arranging the mixed material on a carrier (specifically, arranging the mixed material on the carrier in a coating mode) to form the electrode. Specifically, in step S1 of the above electrode preparation method, the electrode active material and the conductive agent are mixed with the binder fiber to form a mixed material, instead of preparing the mixed material fiber after mixing the electrode active material and the conductive agent with the binder to form a mixed material, this is to avoid damage to the active material during the fiberization process, and prevent the active material particles from breaking to cause a decrease in battery capacity (especially, the positive electrode active material, when damaged, has a greater influence on battery capacity). In one embodiment, in the step S1, the electrode active material and the conductive agent are placed in a container, and then the binder fiber is added to the container and stirred to form a mixed material. Wherein the stirring time is 1-120min or 30-60min. As another embodiment, in the step S1, the electrode active material and the conductive agent are first placed in a container and stirred once, then the binder fiber is added to the container, and the mixture is formed by stirring twice during the process of adding the binder fiber to the container. Specifically, the time of one stirring is 1-120min, or 30-60min. The time of the secondary stirring is determined by the addition amount and the addition speed of the binder fiber, and the secondary stirring is stopped after the binder fiber is completely added into the container. As an embodiment, after the binder fiber is completely added to the container, three times of stirring (which indicates that the binder fiber has been completely added to the container when three times of stirring are performed) are further performed, and the time for three times of stirring is 1 to 120 minutes, or 60 to 100 minutes. As one embodiment, the support is a current collector. As one embodiment, the binder fiber in the electrode preparation method is one or more modified and compounded of PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), SBR (styrene butadiene rubber), CMC (sodium carboxymethyl cellulose), PP (polypropylene), PE (polyethylene), PI (polyimide) and EVA (ethylene-vinyl acetate). When the prepared electrode is a positive plate, the carrier can be aluminum foil, the electrode active material in the electrode preparation method is a positive active material, and the positive active material is modified and compounded by one or more of lithium cobaltate, lithium manganate, lithium nickelate, ternary lithium nickel cobalt manganate and lithium iron phosphate. When the prepared electrode is a negative plate, the carrier can be copper foil, the electrode act