Nickel-cobalt-manganese composite hydroxide added with hexavalent elements and preparation method of nickel-cobalt-manganese composite hydroxide

Abstract

The invention relates to a nickel-cobalt-manganese composite hydroxide added with hexavalent elements and a preparation method of the nickel-cobalt-manganese composite hydroxide. The nickel-cobalt-manganese composite hydroxide added with the hexavalent elements is represented by a general formula NixCoyMnz (OH) 2-2a (MO4) a, wherein x is greater than or equal to 0.30 and less than or equal to 0.92, y is greater than or equal to 0.08 and less than or equal to 0.40, z is greater than or equal to 0.02 and less than or equal to 0.50, a is greater than or equal to 0.001 and less than or equal to 0.02, x + y + z is equal to 1, and M is an added hexavalent element and represents one or a combination of molybdenum and tungsten; according to the invention, a hexavalent element-containing compound is dissolved into an alkaline solution to form a mixed alkaline solution, so atomic-scale mixing of nickel, cobalt, manganese and hexavalent elements is achieved, the internal structure of the nickel-cobalt-manganese composite hydroxide is stabilized through introduction of the hexavalent elements, and the obtained nickel-cobalt-manganese composite hydroxide added with the hexavalent elements has the advantages of being uniform in element distribution, good in dispersity and sphericity degree and stable in crystal lattice.

Description

technical field

[0001] The invention belongs to the technical field of precursors of cathode materials for lithium ion batteries, in particular to a nickel-cobalt-manganese composite hydroxide added with hexavalent elements and a preparation method thereof. Background technique

[0002] As a new type of green power source, lithium-ion batteries have been widely used in 3C digital electronic products, power tools, electric vehicles, energy storage and other fields. One of the key factors determining the electrochemical performance of lithium-ion batteries is the cathode material. Several cathode materials commonly used at present include lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, nickel cobalt lithium manganese oxide, etc. Due to the obvious synergistic effect among Ni, Co, and Mn, NMC has better performance than single-component layered cathode materials, and is considered to be one of the most promising new cathode materials. Due to its good co...

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