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A kind of quaternary cathode material and its preparation method and application

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: 2022-02-18
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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  • A kind of quaternary cathode material and its preparation method and application
  • A kind of quaternary cathode material and its preparation method and application
  • A kind of quaternary cathode material and its preparation method and application

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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: mixing the positive electrode substrate, the soluble cobalt salt, the precipitating agent, the complexing agent and water, separating the liquid from the solid in the mixed system, collecting the solid phase, drying and calcining; 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. In the present invention, the positive electrode base material is washed and coated, and a layer of cobalt compound is evenly coated on the surface to improve the conductivity of the material and play the role of a protective layer, reducing the occurrence of side reactions between the positive electrode material and the electrolyte; at the same time, the precipitation The agent can settle down the remaining lithium source, prevent the jelly-like situation due to the high pH in the later homogenization process, and affect the capacity of the positive electrode material and the cycle retention rate.

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 Patents(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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