A lithium cobalt oxide cathode material coated with an organic metal framework and a preparation method and application thereof

Abstract

The application belongs to the field of lithium ion battery cathode material preparation, and particularly relates to a kind of organic metal framework coated lithium cobaltate cathode material and its preparation method and application.The scheme mixes lithium cobaltate material, methanol, dimethyl imidazole cobalt, titanium carbide, sodium dihydrogen phosphate monohydrate according to the mass ratio of 1:0.070~0.080:0.001~0.002:0.001~0.003:0.001~0.002, sintering, to obtain an organic metal framework coated lithium cobaltate cathode material.The scheme utilizes the synergistic effect of the metal organic framework coating layer formed by dimethyl imidazole cobalt pyrolysis, the three-dimensional conductive network constructed by titanium carbide and the phosphate interface layer to synergistically improve the mechanical strength of the coating layer, accelerate lithium ion diffusion, reduce battery internal resistance, reduce electrode / electrolyte side reactions, inhibit lithium cobaltate volume expansion and cobalt dissolution, significantly improve the high-temperature cycle stability and rate performance of lithium cobaltate battery.Meanwhile, the application also provides the application of the above-mentioned organic metal framework coated lithium cobaltate cathode material in batteries.