Preparation method of nickel cobalt lithium manganate

Abstract

The invention belongs to the field of inorganic non-metallic materials and in particular relates to a preparation method of nickel cobalt lithium manganate. The preparation method comprises the following steps: (1) grinding nickel-cobalt-manganese hydroxide, lithium carbonate and an aluminium fluoride mixture in a mass ratio of 1 to 1 to 0.001 and mixing the powder uniformly to obtain a material A; (2) putting the material A in a container and putting the container in a heating furnace to be heated to 430 DEG C, then carrying out low-temperature insulation treatment for 3.5 hours, continuously heating the material A to 985 DEG C after insulation is completed and then carrying out high-temperature insulation treatment for 11.5 hours and cooling the material, thus obtaining a material B; (3) coarsely crushing the material B and then grinding the material B; (4) heating the material B powder obtained by grinding to 985 DEG C and then carrying out high-temperature insulation treatment for 3.5 hours and then cooling the material B powder to the normal temperature; and (5) finally grinding and sieving the powder to obtain the finished product in standard grain size. The preparation method has the advantages that aluminium fluoride is doped on the basis of existing nickel cobalt lithium manganate to form the aluminium-doped nickel cobalt lithium manganate finished product; and the finished product has good crystallinity, stable properties, higher safety, higher energy density and better cycle property.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a preparation method of nickel-cobalt lithium manganese oxide. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery, which has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect, so it is very popular among people. In lithium-ion batteries, the positive electrode material is the most important part. At present, the most studied positive electrode materials are lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium nickel oxide and lithium nickel cobalt manganese oxide. On a comprehensive basis, these five materials have the following characteristics. Lithium cobaltate is currently the only positive electrode material that has been industrialized on a large scale and widely used in commercial lithium ion ...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes to dope aluminum fluoride when preparing nickel-cobalt-lithium manganese oxide, so as to solve the problems of uneven micro-mixing of raw materials, low diffusion performance and tap density, and poor electrochemical performance in the nickel-cobalt lithium manganese oxide positive electrode material