Ncm ternary positive electrode material with gradient structure for lithium ion battery and its preparation method and application

A lithium-ion battery and gradient structure technology, which is applied to battery electrodes, positive electrodes, structural parts, etc., can solve the problems of unfavorable structure stability and difficulty in maintaining the gradient structure of precursors, etc.

Active Publication Date: 2021-07-13
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In the ternary material, Mn plays a role in stabilizing the structure. The gradient structure Ni, Co, and Mn components disclosed in the above-mentioned reference documents change continuously, and the continuous change of the Mn element is not conducive to the stability of the structure; we know that during the sintering process, the metal The ions will diffuse with each other. The gradient precursor disclosed in the above-mentioned reference document is a spherical particle that is disorderedly piled up by small lumps of primary particles. The gradient precursor of this disorderly piled up spherical structure is in the sintering process. Ni, Co, Mn Interdiffusion leads to degradation (homogenization) of the final ternary material, making it difficult to maintain the gradient structure of the precursor

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  • Ncm ternary positive electrode material with gradient structure for lithium ion battery and its preparation method and application
  • Ncm ternary positive electrode material with gradient structure for lithium ion battery and its preparation method and application
  • Ncm ternary positive electrode material with gradient structure for lithium ion battery and its preparation method and application

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Embodiment 1

[0052] The preparation method that present embodiment provides is as follows:

[0053] S1. Dissolve nickel sulfate, manganese sulfate, and 1 wt% crystal growth inducer PEG20000 in deionized water to prepare a mixed solution A with a total molar concentration of 2 mol / L according to the molar ratio of Ni:Mn being 8:2;

[0054] Simultaneously, take by weighing nickel sulfate, cobalt sulfate, manganese sulfate, 1wt% crystal growth inducer PEG20000 by the molar ratio of Ni:Co:Mn being 4:4:2 and dissolving in deionized water to prepare the mixed mixture whose total molar concentration is 2mol / L Solution B;

[0055] S2. Use 3mol / L sodium hydroxide solution as the precipitating agent, 6mol / L ammonia water as the complexing agent and the mixed solution A to be continuously pumped into the reaction kettle protected by nitrogen gas in parallel, the reaction temperature is 60°C, and the pH value is controlled. 11.5, the stirring speed is 600rpm / min, while the mixed solution B is continu...

Embodiment 2

[0061] The preparation method that present embodiment provides is as follows:

[0062] S1. Weigh nickel nitrate, manganese nitrate, 0.5wt% crystal growth inducer PEG20000 according to the molar ratio of Ni:Mn of 9:1 and dissolve them in deionized water to prepare a mixed solution A with a total molar concentration of 1.5mol / L;

[0063] S2. Weigh nickel nitrate, cobalt nitrate, manganese nitrate, 0.5wt% crystal growth inducer PEG20000 according to the molar ratio of Ni:Co:Mn is 7:2:1 and dissolve in deionized water to prepare a total molar concentration of 1.5mol / L The mixed solution B;

[0064] S3. Use 3mol / L sodium hydroxide solution as the precipitating agent, 8mol / L ammonia water as the complexing agent and the mixed solution A to be continuously pumped into the reaction kettle protected by nitrogen gas in parallel, the reaction temperature is 60°C, and the pH value is controlled. 10.8, the stirring speed is 500rpm / min, at the same time, the mixed solution B is continuousl...

Embodiment 3

[0069] The preparation method that present embodiment provides is as follows:

[0070] S1. Weigh nickel chloride, manganese chloride, and 1.5wt% crystal growth inducer PEG30000 according to the molar ratio of Ni:Mn of 8:2 and dissolve them in deionized water to prepare a mixed solution A with a total molar concentration of 3mol / L;

[0071] S2, according to the molar ratio of Ni:Co:Mn is 5:3:2, take nickel chloride, cobalt chloride, manganese chloride, 1.5wt% crystal growth inducer PEG30000 and dissolve in deionized water to prepare a total molar concentration of 3mol / L medium nickel mixed solution B;

[0072] S3. Use 4mol / L sodium hydroxide solution as the precipitating agent, 6mol / L ammonia water as the complexing agent and the mixed solution A to be continuously pumped into the reaction kettle protected by nitrogen gas in parallel, the reaction temperature is 60°C, and the pH value is controlled. 11.2, the stirring speed is 550rpm / min, while the mixed solution B is continu...

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Abstract

The invention provides a NCM ternary positive electrode material with a gradient structure for lithium ion batteries and its preparation method and application. The molecular formula of the NCM ternary positive electrode material with a gradient structure is: LiNixCoyMnzO 2 , wherein: 0.6 ≤ x ≤ 0.9, 0.1 ≤ y + z ≤ 0.4, x + y + z = 1, the NCM ternary cathode material includes spherical particles formed by a number of strip-shaped primary particles diverging from the center to the surrounding, And the material has a gradient structure in which the Mn content remains constant, the Ni content gradually decreases, and the Co content gradually increases from the center to the outer layer. The preparation process of the ternary cathode material with gradient structure is simple, and the processability is good, and the lithium ion battery made of the material has high capacity, rate performance, cycle stability and safety performance.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium-ion batteries, and in particular relates to an NCM ternary cathode material with a gradient structure for lithium-ion batteries and a preparation method and application thereof. [0002] technical background [0003] The energy crisis and energy security are the severe tests that countries in the world are currently facing. Improving the energy structure and realizing energy diversification is an inevitable choice for national development. Due to its advantages of high voltage, high specific energy, good cycle performance, and low environmental pollution, lithium-ion batteries have become a key direction for the development of new energy industries in various countries. The lithium-ion cathode material is an important part of the lithium-ion battery and a key point in the performance of the lithium-ion battery. [0004] Nickel-cobalt-manganese (NCM) ternary cathode material i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈敏唐泽勋商士波邹少良
Owner 湖南桑瑞新材料有限公司
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