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Modified nickel-cobalt lithium aluminate positive electrode material and preparation method and application thereof

A technology of nickel-cobalt-lithium aluminate and positive electrode materials, which is applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., can solve problems such as poor cycle stability of nickel-cobalt-lithium aluminate, irregular filling of vacancies, and specific capacity degradation, etc., to achieve The preparation conditions are easy to control, the synthesis cycle is short, and the effect of increasing the specific capacity

Active Publication Date: 2021-08-27
GANNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since Ni2+ is difficult to completely transform into Ni3+ during the synthesis of nickel-cobalt lithium aluminate, resulting in Ni2+ / Li+ Irregular filling of vacancies, and at the same time, micro gaps will be formed on the surface of the primary particle during deep discharge, and the specific capacity will deteriorate, resulting in poor cycle stability of nickel-cobalt-aluminate

Method used

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  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method and application thereof
  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method and application thereof
  • Modified nickel-cobalt lithium aluminate positive electrode material and preparation method and application thereof

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preparation example Construction

[0027] The invention provides a method for preparing a modified nickel-cobalt lithium aluminate cathode material, comprising the following steps:

[0028] Mixing the nickel-cobalt-aluminum precursor, the oxidizing agent and water for pre-oxidation to obtain the pre-oxidized nickel-cobalt-aluminum precursor;

[0029] Mixing the pre-oxidized nickel-cobalt-aluminum precursor with a lithium source, and performing a first solid phase sintering to obtain nickel-cobalt-aluminate lithium;

[0030] Mixing the lithium nickel cobalt aluminate, binder, ammonium paratungstate and water to obtain a slurry;

[0031] The slurry is sequentially subjected to spray granulation and second solid-phase sintering to obtain a modified nickel-cobalt lithium aluminate positive electrode material (the preparation process is as follows: figure 1 As shown, among them, figure 1 The "first sintering" corresponds to the "first solid phase sintering", and the "second sintering" corresponds to the "second so...

Embodiment 1

[0077] The nickel-cobalt-aluminum precursor was prepared by referring to the preparation method described in Example 3 of the Chinese Patent Publication No. CN107681143A;

[0078] According to the mass ratio of 95:5, 190g of nickel-cobalt-aluminum precursor, 10g of sodium hypochlorite and water were mixed to obtain a mixed solution with a solid content of 50%. The temperature was raised to 90°C and stirred for 2h, and dried at 180°C for 24h to obtain the prepared Oxidized nickel-cobalt-aluminum precursors;

[0079] According to the mass ratio of 1.5:1, after mixing 150g of pre-oxidized nickel-cobalt-aluminum precursor and 100g of lithium hydroxide monohydrate evenly, the temperature was raised to 750°C for 30h at a heating rate of 10°C / min, and then cooled to room temperature to obtain nickel Lithium cobalt aluminate;

[0080] According to the mass ratio of 92:2:6, 92g lithium nickel cobalt aluminate, 2g polyacrylic acid, 6g ammonium paratungstate and water were mixed to obta...

Embodiment 2

[0084] The nickel-cobalt-aluminum precursor was prepared by referring to the preparation method described in Example 3 of the Chinese Patent Publication No. CN107681143A;

[0085] According to the mass ratio of 93:7, 186g of nickel-cobalt-aluminum precursor, 14g of sodium hypochlorite and water were mixed to obtain a mixed solution with a solid content of 40%. The temperature was raised to 80°C and stirred for 3h, and dried at 120°C for 24h to obtain the prepared Oxidized nickel-cobalt-aluminum precursors;

[0086] According to the mass ratio of 1.5:1, after mixing 150g of pre-oxidized nickel-cobalt-aluminum precursor and 100g of lithium hydroxide monohydrate evenly, the temperature was raised to 650°C for 20h at a heating rate of 10°C / min, and then cooled to room temperature to obtain nickel Lithium cobalt aluminate;

[0087] According to the mass ratio of 93:3:4, 93g lithium nickel cobalt aluminate, 3g polyacrylic acid, 4g ammonium paratungstate and water were mixed to obta...

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Abstract

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to a modified nickel cobalt lithium aluminate positive electrode material and a preparation method and application thereof. The preparation method of the modified nickel-cobalt lithium aluminate positive electrode material comprises the following steps: mixing a nickel-cobalt-aluminum precursor, an oxidant and water, and performing pre-oxidizing to obtain a pre-oxidized nickel-cobalt-aluminum precursor; mixing the pre-oxidized nickel-cobalt-aluminum precursor with a lithium source, and carrying out first solid-phase sintering to obtain nickel-cobalt lithium aluminate; mixing the nickel-cobalt lithium aluminate, a binder, ammonium paratungstate and water to obtain slurry; and sequentially carrying out spray granulation and second solid-phase sintering on the slurry to obtain the modified nickel-cobalt lithium aluminate positive electrode material. The modified nickel-cobalt lithium aluminate positive electrode material prepared by the preparation method disclosed by the invention has relatively high specific capacity and relatively good cycling stability.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified nickel-cobalt lithium aluminate positive electrode material and a preparation method and application thereof. Background technique [0002] As electric vehicles, high-end 3C digital and other fields have higher and higher requirements for lithium-ion batteries, nickel-cobalt lithium aluminate cathode materials have great development prospects due to their high specific capacity, strong cycle ability and good stability. During the synthesis of nickel cobalt lithium aluminate, Ni 2+ Difficult to fully transform into Ni 3+ , resulting in Ni 2+ / Li + Irregular filling of vacancies, while lithium nickel cobalt aluminate will form micro gaps on the surface of primary particles during deep discharge, and the specific capacity will deteriorate, resulting in poor cycle stability of lithium nickel cobalt aluminate. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 李小康郭华彬苑举君彭光怀
Owner GANNAN NORMAL UNIV
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