HIGH-CAPACITY NICKEL-COBALT-BASED LITHIUM ION POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR

摘要

Disclosed is a high-capacity nickel-cobalt-based lithium ion positive electrode material. The lithium ion secondary battery positive electrode material is composed of secondary particles, which are formed by aggregating primary particles, or the primary particles, or mixed particles of the primary particles and the secondary particles. The preparation method therefor is as follows: the preparation of a precursor of the lithium ion secondary battery positive electrode material and the preparation of the lithium ion secondary battery positive electrode material. In the present invention, a nickel-cobalt binary precursor is formed by a continuous co-precipitation reaction, wherein the elements are uniformly mixed and fully reacted, which is beneficial for controlling the morphology; and continuous production is performed, wherein the production efficiency is improved, and the particle size tends to be more uniform. The cation mixing phenomenon is reduced in the binary high-nickel material by doping and coating with a suitable element, such that the structure is stabilized, the electrochemical performance of the battery is improved, and at the same time, the safety performance and high-temperature performance of the battery material are improved.