Nickel-cobalt-manganese hydroxide and preparation method thereof

Abstract

The invention discloses a nickel-cobalt-manganese hydroxide and a preparation method thereof. The preparation method comprises the following steps: a seed crystal reaction kettle performs intermittent reaction on an original material consisting of a nickel-cobalt-manganese ternary mixed solution, ammonia water, an alkaline solution and nitrogen to generate particles with better sphericity and dispersity, a seed crystal preparation tank is used for transferring seed crystals of the seed crystal reaction kettle, and is also used for preparing to make the pH, ammonia value, temperature and the like of the slurry consistent with those of the continuous growth kettle and the stability of a continuous growth kettle not influenced, the continuous growth kettle is mainly used for continuous growth, and when material particles in the continuous growth kettle grow to a certain particle size, seed crystals are quantitatively added into the continuous growth kettle through the seed crystal preparation tank, and the material particle size of the continuous growth kettle is controlled to be stable. According to the invention, a composite precursor product with controllable particle size distribution, good sphericity of large, medium and small particles and consistent morphology can be synthesized; in addition, the whole synthesis process does not need halfway reaction stopping, and continuous growth can be realized.

Description

technical field [0001] The invention belongs to the technical field of precursors of positive electrode materials of lithium ion batteries, in particular to a nickel-cobalt-manganese hydroxide and a preparation method thereof. Background technique [0002] At present, nickel-cobalt-manganese ternary cathode materials have good market prospects and high development potential in the field of power batteries. The performance of the ternary cathode material (nickel-cobalt-manganese oxide) largely depends on the performance of the ternary precursor (such as nickel-cobalt-manganese hydroxide). Wet co-precipitation is a common method for preparing nickel-cobalt-manganese hydroxide. . The size, shape, and structure of nickel-cobalt-manganese hydroxide have a direct impact on the technical indicators of nickel-cobalt-manganese lithium oxide. [0003] The commonly used wet co-precipitation methods include continuous method, batch method and semi-continuous method. The ternary precu...

AI Technical Summary

Problems solved by technology

The ternary precursor produced by the continuous method has the problems of wide particle size distribution, more fine powder, and poor consistency in the shape of large, medium and small particles; the ternary precursor produced by the batch method has narrow particle size distribution, excessively concentrated particle size, and low tap density. Defects such as product Na, product impurity sodium and sulfur content are high, and production cost is high; the semi-continuous process has the problem of low production capacity

Images