High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof

Abstract

The invention relates to a high-density small-particle-size nickel-cobalt-manganese hydroxide and a preparing method thereof. The nickel-cobalt-manganese hydroxide and the preparing method thereof are characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is not more than 0.8 and not less than 0.3, the y is not more than 0.4 and not less than 0.1, and the z is not more than 0.4 and not less than 0.1. The nickel-cobalt-manganese hydroxide is provided, so that problems of small-particle-size nickel-cobalt-manganese hydroxides prepared by methods at present, namely nonuniform element distribution, poor particle appearance, loose surfaces, difficult particle size control, nonuniformity, low tap density, and the like are overcome. A complexing control crystallization coprecipitation method is adopted. By a special technical process of producing nucleuses, growing, and subjecting particles to continuous frictional collision under a continuously increased solid liquid ratio, an aqueous solution of a nickel-cobalt-manganese soluble salt and an aqueous sodium hydroxide solution are subjected to coprecipitation under complexing of ammonia to obtain the small-particle-size nickel-cobalt-manganese hydroxide having characteristics of uniform element distribution, good degree of sphericity, uniform particle size distribution and high tap density.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese hydroxide with high density and small particle size and a preparation method thereof. Background technique [0002] At present, the positive electrode materials used for lithium-ion batteries mainly include lithium cobalt oxide (LiCoO2), lithium nickel cobalt manganese oxide (ternary material, Li(Ni,Co,Mn)O2), lithium manganate, and lithium iron phosphate. Lithium nickel cobalt manganese oxide has gradually become the mainstream in the development and application of lithium-ion battery cathode materials due to its excellent comprehensive performance in terms of energy density, discharge voltage, cycle performance, thermal stability, self-discharge, and cost. It is widely used in the field of lithium-ion batteries for 3C digital electronic products, electric tools, electric bicycles and other small and medium-sized power lithium-ion batteries. In Japan and South Korea, lithium nickel cobalt manganese o...

AI Technical Summary

Problems solved by technology

The three elements of nickel, cobalt and manganese obtained by this process cannot be evenly distributed, and the particle size is uneven, the particle shape is poor, and the tap density is low.

Although the gel-sol method can obtain hydroxide precipitation with uniform distribution of nickel, cobalt and manganese, the particle shape is still poor, the tap density is low, and the production cost is high

The co-precipitation method using a complexing agent and surface activity refers to: under the complexation of ammonia, the nickel-cobalt-manganese soluble salt solution and the sodium hydroxide aqueous solution are used to control the precipitation reaction, and the surfactant polyvinyl alcohol, poly Under the action of ethylene glycol, etc., small-sized nickel-cobalt-manganese hydroxides are obtained. Using this method, the nickel-cobalt-manganese elements are evenly distributed, the particle size is uniform, and the particles are spherical, but the surface of the particles is still loose and the tap density is low.

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