Preparation method of positive pole piece, positive pole piece and preparation method of lithium ion battery

Abstract

The invention discloses a preparation method of a positive pole piece, a positive pole piece and a preparation method of a lithium ion battery. The preparation method of the pole piece comprises the following steps: mixing a water-based solvent and a first adhesive in a mass ratio of (100 to 200): (1 to 30) to obtain a first mixed solution; mixing a silane coupling agent of an epoxy group, a first conductive agent and the first mixed solution in a mass ratio of (10 to 30): (90 to 96): (101 to 230) to obtain a second mixed solution; milling the second mixed solution to obtain a first sizing agent, and coating the first sizing agent on the surface of an aluminum foil; baking the first sizing agent to obtain a carbon layer formed on the surface of the aluminum foil; mixing an electrode active material, a second conductive agent and a second adhesive in a mass ratio of (90 to 98): (1 to 10): (1 to 30) to obtain a third mixed solution; milling the third mixed solution to obtain a second sizing agent, and coating the second sizing agent on the surface of the carbon layer; and baking the second sizing agent to obtain an electrode active layer formed on the surface of the carbon layer. Therefore, the performance of the power battery is improved, meanwhile the cost is reduced, green and safe market requirements are met, and good electrical conductivity is guaranteed.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a positive pole piece for improving the performance of a power battery, a positive pole piece, and a preparation method for a lithium ion battery. Background technique [0002] Constructing a resource-saving and environment-friendly harmonious society is a long-term policy of the Chinese government. Lithium-ion battery electric vehicles are in line with the national development policy with their advantages of easy use, light weight, and safety. It is a technology that embodies the industry A representative product of progress. [0003] The main difficulties faced by current power batteries are: high discharge power requirements, fast charge and discharge performance requirements, and long cycle life requirements. LFP material itself has poor conductivity, so most of them are made into submicron or even nanometer particles to increase conductivity. Howeve...

AI Technical Summary

Problems solved by technology

[0003] The main difficulties faced by current power batteries are: high discharge power requirements, fast charge and discharge performance requirements, and long cycle life requirements

LFP material itself has poor conductivity, so most of them are made into submicron or even nanometer particles to increase conductivity, but it is still difficult for LFP particles to directly contact with aluminum foil, so it must be compensated by a conductive coating

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