Nickel cobalt lithium manganite precursor of nanosheet agglomeration secondary particle and preparing method thereof

Abstract

The invention provides a nickel cobalt lithium manganite precursor of a nanosheet agglomeration secondary particle. The growth mode inside the precursor is hexagonal nanosheets which are stacked, the side length of the hexagonal nanosheet is 200-500 nanometers, and the thickness is 70-200 nanometers; the particle size of the agglomeration secondary particle D10 is bigger than or equal to 6 micrometers, D50 is equal to 9-15 micrometers, and D90 is smaller than or equal to 30 nanometers. The preparing method of the nickel cobalt lithium manganite precursor of the nanosheet agglomeration secondary particle comprises the steps of firstly preparing a soluble mixed brine solution, adding ammonium hydroxide as a base solution of a reaction kettle, and adjusting the pH of the base solution to be 11-12; inflating nitrogen into the reaction kettle and starting stirring; adding the soluble mixed brine solution, a strong alkaline solution and ammonium hydroxide into the reaction kettle for a stirring reaction, after the reaction for some time, making unqualified feed circularly pumped into the reaction kettle, and aging, compressing and washing an overflowed feed; after washing, drying, screening and storing the material. The nickel cobalt lithium manganite precursor of the nanosheet agglomeration secondary particle is better in uniformity and electrochemical performance; moreover, the product stability is good.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a precursor of nickel-cobalt-lithium-manganese oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become a new type of green secondary batteries due to their high specific capacity, superior cycle performance, and no memory effect. Lithium-ion batteries have been widely used in various portable electronic products, such as mobile phones, notebooks, cameras, etc. In recent years, with the rise of the electric vehicle market, lithium-ion batteries also have broad application prospects in EV, xEV and other fields. With the increasing demand of the lithium battery market, the performance of lithium-ion batteries has also put forward higher requirements, such as high capacity, high power, high safety and so on. The performance of lithium-ion batteries depends largely on the performance of lithium-ion battery catho...

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Problems solved by technology

Invention patent CN201210525623.1 discloses the preparation method of the precursor of nickel-cobalt-manganese multi-element lithium-ion battery cathode material, but it does not describe the production of different primary particles caused by adjusting different processes in this method, nor does it describe the primary particles of different shapes Research on the impact of the precursor body on the performance of the cathode material

Invention patents CN105731553A and CN105355907A also use the co-precipitation method to prepare precursors, respectively expounding the influence of the primary particles on the performance of positive electrode materials when the primary particles are crystal group-like precursors and annual ring-shaped precursors, but the specific particle morphology used in these patents However, its capacity, rate performance and cycle performance have not been significantly improved and improved

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