Method for improving hygroscopicity of ternary anode material and gelling phenomenon of sizing agent

Abstract

The invention discloses a method for improving hygroscopicity of a ternary anode material and a gelling phenomenon of a sizing agent. The method comprises the following steps: taking a certain amountof silane coupling agent solution, adding the ternary anode material into the solution, stirring fully, and then drying; mixing a binding agent, a conductive additive and the ternary anode material which is treated as above in proportion to prepare the sizing agent, coating an anode substrate with the sizing agent, and drying; then taking a certain amount of silane coupling agent solution, coatinga surface of a ternary anode piece with the solution to obtain a complete ternary anode piece. The ternary anode material and the anode substrate are each coated with a layer of the silane coupling agent, which can be used for effectively reacting with and remove trace water adsorbed on the surface of the substrate, and a hydrophobus protection layer resistant to HF (hydrogen fluoride) corrosionis formed on the surface of the substrate, so that the air storage property and electrochemical property of the anode piece are improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for improving the hygroscopicity and slurry gelation of ternary positive electrode materials. Background technique [0002] At present, commercial lithium-ion batteries mainly use LiCoO 2 As a cathode material, but LiCoO 2 There are safety and overcharge resistance problems, Co is a rare resource, the price is expensive, and the metal cobalt is easy to pollute the environment. while LiNiO 2 Poor stability, easy to cause safety problems, need to be synthesized under an oxygen atmosphere, and prone to cation mixing and formation of non-stoichiometric structural compounds. LiMn 2 o 4 During the cycling process, the crystal transformation and the Jahn-Teller effect of the dissolution of manganese ions are prone to occur, resulting in battery capacity attenuation. [0003] Ternary cathode material nickel cobalt manganese oxide system integrated LiCo...

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium-ion batteries mainly use LiCoO 2 As a cathode material, but LiCoO 2 There are safety and overcharge resistance problems, Co is a rare resource, the price is expensive, and metal cobalt is easy to pollute the environment

while LiNiO 2 Poor stability, easy to cause safety problems, need to be synthesized under an oxygen atmosphere, and prone to cation mixing and formation of non-stoichiometric structural compounds

LiMn 2 o 4 During the cycle, it is easy to undergo crystal transformation and the Jahn-Teller effect of the dissolution of manganese ions, resulting in battery capacity decay

[0003] Ternary cathode material nickel cobalt manganese oxide system integrated LiCoO 2 Good cycle performance, LiNiO 2 The high specific capacity and LiMnO 2 High safety and low cost, etc., but its poor cycle stability, thermal stability and storage performance greatly limit its application

Commonly used methods include doping, coating, and preparing materials with special structures, but these works do not improve the electrochemical performance of materials ideally.

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