High-nickel type lithium nickel cobalt manganese oxide single crystal precursor and preparation method thereof, and high-nickel type lithium nickel cobalt manganese oxide single crystal cathode material

Abstract

The invention discloses a high-nickel type lithium nickel cobalt manganese oxide single crystal precursor, which is a hydroxide of nickel, cobalt and manganese, wherein the primary particles of the precursor are in tiled arrangement and in the form of a sheet, and the secondary particles are internally loosely spherical. The invention also provides a preparation method of the above high-nickel type lithium nickel cobalt manganese oxide single crystal precursor correspondingly. The method comprises the following steps of (1) preparing a soluble salt solution; (2) parallel adding the soluble salt solution and a complexing agent and a precipitating agent into a reactor containing a base liquid under the protective gas for carrying out continuous co-precipitation reaction; and (3) performing solid-liquid separation on the co-precipitation product in the step (2), and collecting solid phases for aging, washing, dehydration, drying and sieving treatment to obtain the above precursor. The invention also provides a high-nickel type lithium nickel cobalt manganese oxide single crystal cathode material, which has excellent cycle performance while maintaining a high specific capacity.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a lithium-ion battery cathode material precursor, a preparation method thereof, and the cathode material. Background technique [0002] Lithium-ion secondary batteries are becoming more and more important in people's lives, and have been widely used as a source of portable power. As the country pays more and more attention to the environment, industrial upgrading is becoming more and more urgent, and investment in new energy materials continues to increase, the production and sales of power vehicles have also shown explosive growth. Lithium-ion secondary batteries for power vehicles have high requirements on energy density, cycle performance, charge-discharge efficiency, and safety performance. The development and preparation of high-nickel single crystal cathode materials that match lithium-ion batteries for power vehicles will have broad applications pr...

AI Technical Summary

Problems solved by technology

The reason for the insufficient specific capacity lies in the poor stability of conventional high-nickel-content cathode materials. In the prior art, low-nickel-content precursor cathode materials are usually used, so the energy storage factor content is low and the specific capacity is not high.

The reason for the unsatisfactory cycle performance is that the capacity fades during the charge and discharge process.

On the one hand, the capacity fading is due to the gradual irreversible change of the structure of the positive active material as the cycle progresses; Material loss, leading to capacity fading

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