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Quaternary positive electrode material and preparation method and application thereof

A cathode material and cathode technology, applied in the field of quaternary cathode materials and their preparation, can solve the problems of large contact area of ​​electrolyte, larger specific surface area, severe side reactions, etc., and achieve a simple preparation method, short cycle and easy synthesis. Effect

Active Publication Date: 2021-09-24
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a preparation method of a quaternary positive electrode material to solve the problem of rough surface of the high-nickel quaternary positive electrode material in the prior art after washing, larger specific surface area, larger contact area with electrolyte, and more severe side reactions question

Method used

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  • Quaternary positive electrode material and preparation method and application thereof
  • Quaternary positive electrode material and preparation method and application thereof
  • Quaternary positive electrode material and preparation method and application thereof

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preparation example Construction

[0024] According to one aspect of the present invention, the present invention relates to a kind of preparation method of quaternary cathode material, comprising the following steps:

[0025] Mix the positive electrode substrate, soluble cobalt salt, precipitant, complexing agent and water, separate the liquid and solid of the mixed system, collect the solid phase, dry and calcinate;

[0026] The general chemical formula of the positive electrode substrate is LiNi x co y mn z Al (1-x-y-z) o 2 , wherein, 0.9≤x<1, 0<y<0.07, 0<z<0.03.

[0027] The present invention mixes soluble cobalt salt, precipitating agent, complexing agent, water and positive electrode substrate, washes and coats the positive electrode substrate, and uniformly coats a layer of cobalt compound on the surface of the positive electrode substrate, which can improve the material The conductivity can also play the role of a protective layer, reducing the occurrence of side reactions between the positive elec...

Embodiment 1

[0074] A preparation method of a quaternary cathode material, comprising the following steps:

[0075] (a) Dry-mix nickel-cobalt-manganese-aluminum hydroxide and LiOH in a mixer, calcinate the dry-mixed material in an ordinary box-type furnace at 700°C in an oxygen atmosphere for 8 hours, cool, pulverize and sieve to obtain Positive electrode substrate; wherein, the molar ratio of nickel-cobalt-manganese-aluminum hydroxide and LiOH is 1:1.025 (Li / Metal (Ni, Co, Mn and Al) = 1.025) in terms of metal elements; nickel-cobalt-manganese-aluminum hydroxide In the material, the molar ratio of Ni, Co, Mn and Al is 90: 7: 2: 1;

[0076] (b) Mix the positive electrode substrate, ammonia water, and distilled water obtained above at a mass ratio of 1:0.2:100, and stir at 200r / min for 5 minutes to obtain the first mixed system; then add the obtained first mixed system Add dropwise cobalt sulfate solution, the mass ratio of positive electrode base material and cobalt sulfate is 1:0.01, obt...

Embodiment 2

[0080] A preparation method of a quaternary cathode material, comprising the following steps:

[0081] (a) Dry-mix nickel-cobalt-manganese-aluminum hydroxide and LiOH in a mixer, calcinate the dry-mixed material in an ordinary box-type furnace at 700°C in an oxygen atmosphere for 8 hours, cool, pulverize and sieve to obtain Positive electrode substrate; wherein, the molar ratio of nickel-cobalt-manganese-aluminum hydroxide and LiOH is 1:1.025 (Li / Metal (Ni, Co, Mn and Al) = 1.025) in terms of metal elements; nickel-cobalt-manganese-aluminum hydroxide In the material, the molar ratio of Ni, Co, Mn and Al is 90: 7: 2: 1;

[0082] (b) Mix the positive electrode base material, ammonia water, and distilled water obtained above at a mass ratio of 1:0.15:100, and stir at 200r / min for 5 minutes to obtain the first mixed system; then add the obtained first mixed system Add dropwise cobalt sulfate solution, the mass ratio of positive electrode base material and cobalt sulfate is 1:0.00...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a quaternary positive electrode material and a preparation method and application thereof. The preparation method of the quaternary positive electrode material comprises the following steps of: mixing a positive electrode base material, soluble cobalt salt, a precipitator, a complexing agent and water, carrying out liquid-solid separation on a mixed system, collecting a solid phase, and drying and calcining the solid phase. The chemical general formula of the positive electrode base material is LiNi<x>Co<y>Mn Al <1-x-y-z>O2, wherein x is more than or equal to 0.9 and less than 1, y is more than 0 and less than 0.07, and z is more than 0 and less than 0.03. According to the invention, the positive electrode base material is washed and coated, and the surface of the positive electrode base material is uniformly coated with a layer of cobalt compound, so that the conductivity of the material is improved, the function of a protective layer is realized, and side reaction of the positive electrode material and electrolyte is reduced; and meanwhile, the precipitant can settle a residual lithium source, so that the situation that the capacity exertion and the circulation retention rate of the positive electrode material are affected due to the fact that the pH value is too high in the later homogenization process and a jelly-like condition occurs is prevented.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a quaternary cathode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the most widely used electrochemical power source at present. The most representative of this kind of battery is the lithium secondary battery that generates electric energy due to the change of chemical potential of lithium ions in the positive and negative electrodes when intercalation and deintercalation. (LIBs). Cathode materials have a direct and dominant effect on the performance of LIBs, so many researchers are committed to realizing a cathode material with large capacity, fast charge / discharge speed, and long cycle life that can perform reversible intercalation and deintercalation of lithium ions. Currently, high-nickel materials are considered to be one of the most promising candidates because they can increase the spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G51/00H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/052
CPCC01G53/44C01G51/00H01M4/366H01M4/505H01M4/525H01M4/485H01M4/628H01M4/624H01M10/052H01M2004/028H01M2004/021C01P2004/80C01P2006/40Y02E60/10C01G53/42C01P2002/52
Inventor 王壮张树涛李子郯王亚州白艳马加力杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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