Polymer power cell anode-cathode film

Abstract

The invention relates to a cathode and anode film of a polymer battery. A cathode and anode film of a polymer battery, which is prepared by using active materials, adding a conductive agent, a pore-forming agent, a solvent and a binder to make a slurry, and then coating it on a polyester film. It is characterized in that: The agent is a mixture of two different molecules of copolymerized vinylidene fluoride-hexafluoropropylene. The present invention mixes two kinds of PVDF with different characteristics as the binder in the film-making process, controls the viscosity of the slurry in a certain range, and effectively improves the fluidity of the slurry in the film-making process; the direct coating method is used to make the film , the process is convenient to operate, the thickness deviation of the cathode and anode films produced is small, the yield is high, and the cost is low, making it possible to commercialize lithium-ion batteries on a large scale.

Description

Technical field: [0001] The invention relates to a cathode and anode film of a polymer battery. technical background: [0002] When the world is facing increasingly serious environmental problems and future oil and other energy sources will be exhausted, seeking renewable energy can become an urgent task for mankind. As a new generation of green high-energy batteries, lithium-ion batteries have many advantages such as high voltage, high specific energy, no memory effect, no pollution, and light weight. They are widely used in mobile communications, notebook computers, UPS, electric bicycles, electric vehicles and other industries. , is considered to be a high-tech product of great significance to the national economy and people's life in the 21st century. [0003] Polymer lithium-ion batteries are favored due to their excellent safety performance and high energy density. At present, the preparation process of the cathode and anode membranes of polymer lithium-ion batteries...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the problem of large deviation in the thickness of cathode and anode films of batteries currently produced, and provides a cathode and anode membrane using two kinds of copolymerized polyvinylidene fluoride-hexafluoropropylene with different molecules as a binder, which reduces the thickness of the membrane. thickness difference

[0005] The invention also solves the problems that the slurry is not easy to be produced, the yield is low, the waste of raw materials is large, and the cost of film making is high during the film making process. The anode and cathode film of the binder can control the viscosity of the slurry in a certain range, effectively improving the fluidity problem in the film making process, improving the yield and reducing the cost

[0006] Another object of the present invention is to solve the complex problem of the traditional cathode and anode membrane preparation process. Two kinds of copolymerized polyvinylidene fluoride-hexafluoropropylene with different molecules are used as the binder, and the membrane can be directly prepared by coating method, and the process is easy to operate. Moreover, the thickness deviation of the cathode and anode films produced is small, and the yield is high