Preparation method for cobalt-nickel-manganese-lithium battery positive electrode material

Abstract

The invention relates to cobalt-nickel-manganese-lithium positive electrode material, and specifically to a preparation method for a cobalt-nickel-manganese-lithium battery positive electrode material. The preparation method comprises the steps of mixing solid Mn(NO<3>)<2>, CoCO<3> and Ni(NO<3>)<2>.6H<2>O based on chemometry, and performing ball milling on the mixture to obtain mixed particles; mixing the mixed particles with solid Li<2>CO<3>, and putting the mixture into an inner cavity of a rotary roller to throw out; then putting the thrown-out mixture into the inner cavity of the roller again to obtain a uniformly-mixed mixture; adding a dispersing agent and performing mechanical activation; then drying to obtain a precursor; performing pre-sintering on the precursor; then performing grinding after pre-sintering and then performing baking on the precursor to obtain the cobalt-nickel-manganese-lithium battery positive electrode material. According to the preparation method, a ternary material is subjected to ball milling by a ball milling machine initially, so that uniform particle size of the material is realized; irregular circulation movement of the mixed material is realized by centrifugal force and a fan, so that the purpose of uniformly mixing materials without dead corners is fulfilled; and then the cobalt-nickel-manganese-lithium battery positive electrode material with an excellent electrochemical performance is obtained by carrying out pre-sintering and baking.

Description

technical field

[0001] The invention relates to a positive electrode material of a nickel-cobalt-manganese-lithium battery, in particular to a preparation method of a cobalt-nickel-manganese-lithium positive electrode material. Background technique

[0002] In recent years, new lithium-ion composite cathode materials have developed rapidly, especially nickel-cobalt-manganese-lithium cathode materials, which have become a hot research topic for experts and scholars at home and abroad. with commercial LiCoO 2 Compared with the nickel-cobalt-manganese-lithium cathode material, it has the advantage of low cost; compared with LiNiO 2 Compared with nickel-cobalt-manganese-lithium cathode materials, it is easier to synthesize, and the cycle performance and thermal stability are relatively good; compared with spinel LiMn 2 o 4 Generally speaking, the nickel-cobalt-manganese-lithium cathode material has a more stable structure during charge and discharge, and the Jahn-Teller effec...