Precursor nickel-cobalt-manganese hydroxide of ternary material used for lithium batteries and preparing method thereof

Abstract

The invention relates to a precursor nickel-cobalt-manganese hydroxide of a ternary material used for lithium batteries and a preparing method thereof. The nickel-cobalt-manganese hydroxide is 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 less than 1 and more than 0, the y is less than 1 and more than 0 and the z is less than 1 and more than 0. The ternary material prepared from the nickel-cobalt-manganese hydroxide is high in compaction density, good in cyclic performance, high in thermal stability and low in self-discharge and has good comprehensive performance. The preparing method introduces a single-kettle batch production mode into a continuous production mode. A product with wide particle size distribution and more small particles is prepared by continuous production. Based on the product of the continuous production, batch production is utilized, the production process is free of generation of new small particles, only original small particles grow to be more compact, other larger particles grow at the same time, and the finished product is still wide in particle size distribution.

Description

technical field [0001] The invention relates to a ternary material precursor nickel-cobalt-manganese hydroxide for lithium batteries and a preparation method thereof. Background technique [0002] The key material of lithium-ion batteries is the positive electrode material, which accounts for about 30% of the cost of lithium-ion batteries. At present, lithium cobalt oxide, ternary materials, lithium manganate, and lithium iron phosphate are mainly used in the market. Ternary material is a new type of battery positive electrode material. Compared with lithium cobaltate, it has high mass specific capacity, low cost and good thermal stability; compared with lithium manganese oxide, it has high mass specific capacity, good cycle performance and low operating temperature. Wide; Compared with lithium iron phosphate, it has high working voltage and high energy density. Good comprehensive performance makes ternary materials become the mainstream in the current market, occupying the...

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Problems solved by technology

However, there are more fine particles, loose particles on the surface and particles with poor development in the products produced by the prior art.

[0004] Although the ternary material prepared with this nickel-cobalt-manganese hydroxide has high mass specific capacity, high compaction density, and good rate performance, due to the existence of small particles, the small particles are easy to overcharge and over-discharge during the charging and discharging process. Leading to the destruction of crystal structure, the existence of small particles is the root cause of poor thermal stability, poor cycle performance and high self-discharge rate of ternary materials

Although some manufacturers remove some small particles by screening after sintering, resulting in high production costs, most of the small particles are agglomerated or bonded to large particles during the sintering process, and cannot be removed at all. Therefore, it is necessary to To solve the problem of small particles in nickel-cobalt-lithium manganese oxide, it is necessary to start with its precursor nickel-cobalt-manganese hydroxide and find a way to remove small particles in nickel-cobalt-manganese hydroxide

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