Lithium ion battery positive electrode material with layered-spinel symbiotic structure and preparation method

Abstract

A preparation method for a Li-ion battery positive electrode material with layered-spinel symbiotic structure comprises the following steps: (a) synthesizing Mn(OH)2 particle, which is the precursor of Li2MnO4 with spinel structure by chemical coprecipitation method; (b) synthesizing (Ni1 / 3Co1 / 3Mn1 / 3)(OH)2 particle by chemical coprecipitation method using the Mn(OH)2 particle as nucleater, wherein the Mn(OH)2 particle synthesized in step (a) is gradually wrapped by the (Ni1 / 3Co1 / 3Mn1 / 3)(OH)2 particle; (c) washing the precipitate to remove alkali metal ions and acid radical ions in the precipitate and drying; and (d) uniformly mixing the mixed NiCoMn hydrate particle with a Li compound, calcining, and cooling to obtain the final product. The method can greatly improve the Mn content in thepositive electrode material with NiCoMn ternary system, and keep higher capacity and cycle performance of the positive electrode material, thereby effectively lowering the cost.

Description

technical field The invention relates to a novel positive electrode material of a lithium ion battery, in particular to a lithium nickel cobalt manganese oxide material, which belongs to the field of energy storage materials. Background technique Lithium cobalt oxide material, as the first generation of commercial lithium-ion battery cathode material, has many advantages such as simple preparation process, stable structure, high energy density, good cycle performance, high and relatively stable voltage platform, etc. It is currently the most mature The positive electrode material cannot be completely replaced by other system materials in a short period of time, especially in the field of communication batteries. However, the shortage of cobalt resources, expensive materials, poor safety and other defects make it necessary to develop corresponding alternative materials. Now there are two directions to replace lithium cobalt oxide materials. One is in the field of power batt...

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Problems solved by technology

The object of the present invention is to provide a kind of preparation method of layered-spinel symbiotic structure lithium-ion battery anode material, produce cycle performance and capacity and current LiCoO 2 Equivalent, and lithium-ion battery positive electrode materials with low Co and Ni content, in order to reduce the cost of lithium-ion battery positive electrode materials, solve the problem of lack of cobalt resources and expensive materials

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