A kind of carbon-coated ternary positive electrode material and preparation method thereof

Abstract

The invention discloses a carbon-coated ternary cathode material. The chemical formula of the carbon-coated ternary cathode material is LiNi<x>Co<y>Mn<z>O<2>, wherein 0.2<=x<=0.7, 0.1<=y<=0.5, 0.2<=z<=0.3, and x+y+z=1. The outer surface of the carbon-coated ternary cathode material is coated with a carbon carbon network. The invention also provides a preparation method. The carbon-coated ternary cathode material is capable of improving electrode electrical conductivity effectively, improving surface chemical properties of active materials, protecting electrodes from direct contact with electrolyte, and prolonging cycle life.

Description

technical field

[0001] The invention belongs to the technical field of cathode materials, and in particular relates to a carbon-coated ternary cathode material and a preparation method thereof. Background technique

[0002] Nickel cobalt lithium manganese oxide ternary cathode material has been widely studied since it was first reported in 1999. The ternary cathode material combines lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide through the synergistic effect of Ni-Co-Mn. The advantages of the three materials: high capacity characteristics of lithium nickel oxide, high safety performance and low cost of lithium manganese oxide, good cycle performance of lithium cobalt oxide, has become one of the most promising cathode materials for lithium ion batteries in recent years . At present, the country is vigorously developing new energy vehicles. As a high-capacity, high-energy-density lithium-ion battery cathode material, ternary materials have great adv...