LITHIUM-ION BATTERY POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREOF

摘要

The present disclosure provides a lithium-ion battery positive electrode material and a preparation method thereof. In the lithium-ion battery positive electrode material, a secondary particle comprises lithium-containing multi-element transition metal oxide primary particles and a second phase material, a second phase material forms a second phase material layer distributed on a surface of the primary particle and forms a diffusion layer together with the lithium-containing multi-element transition metal oxide by means of atoms mutual diffusion to make the second phase material layer combined with the primary particle during formation of the secondary particle from the primary particles, thereby effectively suppressing chalking of the secondary particle along boundary among the primary particles, and effectively controlling size of the primary particles and the secondary particles, and improving specific capacity, cycling performance and safety performance of a lithium-ion battery to which the lithium-ion battery positive electrode material is applied.

主权项

1. A lithium-ion battery positive electrode material, a secondary particle (SP) of the lithium-ion battery positive electrode material comprising lithium-containing multi-element transition metal oxide primary particles (PP) and a second phase material,
a formula of the lithium-containing multi-element transition metal oxide being Li1+εNixCoyMnzM1-x-y-zO2-γAγ, in which −0.1<ε<0.1, 0