Preparation method of high-density nickel-cobalt-manganese hydroxide

Abstract

The invention relates to a preparation method of high-density nickel-cobalt-manganese hydroxide. The preparation method comprises three stages of reaction systems, each stage of reaction system comprises one or more than one reaction unit, and each reaction unit comprises a reaction kettle, an overflow pipe, an intermediate tank, a diaphragm pump, a thickener and a return pipe which are connectedin sequence; the invention provides the preparation method of high-density nickel-cobalt-manganese hydroxide, and aims to solve the problems that in the current process of preparing a precursor through coprecipitation, small and micro particles cannot be eliminated, particle size distribution is wide, large particles are prone to breakage, morphology consistency is poor, and the impurity sodium-sulfur content is high. The precursor particles prepared by the method have the characteristics of higher consistency, no small-particle and micro-powder phenomena, centralized particle size distribution, higher tap density, extremely compact particles, low possibility of breakage, low sodium-sulfur content and the like, so that the subsequently prepared positive electrode material has higher safetyperformance, cycle performance and higher specific capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery anode material precursors, in particular to a preparation method of high-density nickel-cobalt-manganese hydroxide. Background technique [0002] At present, it is very urgent to solve the cruising range, safety and cycle life of batteries. Ternary material is a kind of positive electrode material of lithium battery. Due to its advantages of good safety, high gram specific capacity and low price, it will become one of the development directions of lithium battery industry in the future. The application technology of ternary material is relatively mature, and the market prospect is optimistic. . [0003] At present, the preparation process of the ternary precursor is mainly the chemical co-precipitation method, especially the preparation of the nickel-cobalt-manganese ternary material precursor by using a stirred reactor. During the process, the growth of crystal planes is mainly cont...

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Problems solved by technology

[0004] The present invention aims at the problems that small and micro particles, wide particle size distribution, easily broken large particles, poor shape consistency and high impurity sodium and sulfur content cannot be eliminated in the process of preparation of precursors by co-precipitation, and provides a high-density nickel-cobalt-manganese hydroxide The preparation method of the material, the precursor particles prepared by this method have high consistency, no phenomenon of small particles and fine powders, concentrated particle size distribution, high tap density, extremely dense particles, not easy to break, sodium sulfur Low content and other characteristics, so that the subsequent preparation of the positive electrode material has higher safety performance, cycle performance and higher specific capacity

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