Preparation method of positive electrode material of lithium ion battery for electric vehicle

Abstract

The invention relates to a preparation method of a positive electrode material of a lithium ion battery for an electric vehicle, belonging to the technical field of electrochemistry, powder metallurgy and electronic products. A characteristic general formula of the material is Li (1+x) Mn (2-y) MyO (4+delta) (in the formula, Li / Mn=(1+x) / (2-y) is larger than or equal to 0.62 and is less than or equal to 0.75, X is larger than or equal to minus 0.2 and is less than or equal to 0.23, Y is larger than or equal to 0.016 and is less than or equal to 0.93, delta is larger than or equal to 0.1, M is any element of Co, Ni, Cr, Zn, Y, Fe, Ag, Ca, V, Cu, Zr, Ti, Sn, Mo, La, Ce, Pr and Nd). The preparation method comprises the following steps of: mixing and drying an elementary substance containing Li, Mn and other metals or salts or oxides in an organic solvent, directly sintering in a high temperature, carrying out furnace cooling to 200 DEG C, breaking, sieving, sintering in a medium temperature, carrying out slow cooling to 200 DEG C, and pulverizing and sieving to obtain the needed material. The positive electrode material of the lithium ion battery for the electric vehicle has the outstanding advantages of low cost, long cycle life, good performance in a 55 DEG C high temperature; and the technology is simple and convenient to operate, has good controllability and can realize low cost mass production.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery for an electric vehicle, which belongs to the technical fields of electrochemistry, powder metallurgy and electronic products. Background technique [0002] The application of lithium-ion batteries in electric vehicles is promoting their development in the direction of safety, environmental protection, low cost and high energy density. The research on the performance improvement and application technology of lithium-ion batteries has become the focus and frontier of power battery research. The improvement of the performance and the reduction of the price of the positive electrode material of lithium-ion battery are important links for the further development of lithium-ion battery. Among the existing lithium-ion battery cathode materials for electric vehicles, lithium manganate has the advantages of abundant raw materials, low price, no environmenta...

AI Technical Summary

Problems solved by technology

In China's invention patent CN1296305A (name: non-aqueous electrolyte storage battery, announced on May 23, 2001), it is pointed out that the larger the atomic ratio of lithium and manganese, the higher the capacity retention rate at high temperature, but the Li / Mn ratio exceeds 0.62. There will be no improvement in performance, but the capacity will be significantly reduced.