Modified carbon nanotube-modified nickel cobalt manganese ternary composite electrode material and preparation method therefor

Abstract

The invention relates to a modified nanotube-modified nickel cobalt manganese ternary composite electrode material. The ternary composite electrode material is prepared from modified carbon nanotubesand a precursor; the modified carbon nanotubes comprise one or two kinds of nitrogen modified carbon nanotubes or boron modified carbon nanotubes; the modified carbon nanotubes account for 1-10% of the composite electrode material; the precursor comprises lithium carbonate and nickel cobalt manganese; and the molar ratio of the lithium element in nickel cobalt manganese to nickel cobalt manganeseis 1.0-1.05 to 1. The invention also provides a preparation method of the composite electrode material. By virtue of the preparation method, the problems of low electronic conductivity, poor rate stability, poor high-voltage cycling stability and the like can be solved.

Description

technical field

[0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a nickel-cobalt-manganese ternary positive electrode material modified by modified nanotubes. Background technique

[0002] Ternary lithium-ion battery cathode material is a new type of lithium-ion battery cathode material developed in recent years, which has the advantages of moderate cost, high capacity, and high cycle stability. Ternary materials, compared with lithium cobalt oxide materials, reduce production costs, improve safety performance, and have higher stability compared with lithium manganese oxide materials, and their status in positive electrode materials is gradually emerging. In the future, electric vehicles, power In the field of batteries, ternary materials will be favorable competitors.

[0003] Compared with lithium cobalt oxide, ternary materials also have some problems that need to be solved urgently, mainly including low el...