CARBON-COATED FAST-IONIC CONDUCTOR-MODIFIED POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR

Abstract

A positive electrode material has a chemical general formula of LiaNixCoyMnzO2·cA·dB, in which 1.00≤a≤1.20, 0.00<c≤0.01, 0.00<d≤0.02, 0.00≤x<1.00, 0.00≤y<0.2, 0.00≤z<0.4, and x+y+z=1; A is a first coating material, and B is a second coating material; and the first coating material A is a carbon-coated fast-ionic conductor, and the second coating material B is a carbon escape-prevention compound. A fast-ionic conductor modified through carbon coating is used to modify a positive electrode material, such that the ionic conductivity and the electronic conductivity of the positive electrode material are synchronously improved. The surface of the carbon-coated fast-ionic conductor is coated with boric acid due to the glassy property, such that the escape of carbon in the carbon-coated fast-ionic conductor is effectively prevented.

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