Preparation method of positive electrode slice of high voltage solid density high energy density lithium ion battery

Abstract

The invention relates to an anode paste of lithium ion battery and a positive plate, a lithium ion battery of the positive slurry, therein the positive slurry includes positive electrode active material, positive electrode binder, positive conductive agent and positive additive. The positive conductive agent is porous carbon conductive agent. The positive additive is fluorocarbon surfactant. Related to existing technology, the porous carbon conductive agent of this preparation method has excellent electronic conductivity and ionic conductivity, which internal resistance of the battery can be greatly reduced and the power and magnification performance of high voltage solid density cell will be improved. Further, fluorocarbon surfactant effectively reduces the surface tension of the positive paste, improves the effect that the positive slurry is wetted, flat and coated on the surface of the positive collector and enhances the absorption and preservation of electrolyte to positive plate. The use of porous carbon conductive agent and fluorocarbon surfactant can obviously improve the conductivity of the positive electrode of high voltage solid density, and obtain a high-performance energy density battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive electrode slurry with high compaction and high energy density, a positive electrode sheet including the positive electrode slurry, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of small self-discharge, high specific energy, long cycle life, environmental protection and pollution-free, and are increasingly widely used in portable electronic products, electric vehicles, reserve power supplies, and aviation fields. With the rapid development of science and technology in various industries, higher and higher requirements are put forward for the energy density, rate performance and cycle performance of lithium-ion secondary batteries. At present, improving the high energy density of the battery is mainly achieved by increasing the compacted density and gram capacity of the material. The increase in the compacted density...

AI Technical Summary

Problems solved by technology

At present, improving the high energy density of the battery is mainly achieved by increasing the compacted density and gram capacity of the material. The increase in the compacted density can significantly increase the volumetric energy density of the battery, but it also leads to poor conductivity of the positive and negative active materials. Difficulties such as difficult infiltration of the electrolyte, which in turn affect the rate performance and long cycle performance of the battery

Images