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A kind of high nickel ternary lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in the field of high-nickel ternary lithium-ion battery cathode materials and its preparation, can solve the problems of high-nickel ternary materials such as poor cycle performance, reduced operating voltage, and poor rate performance, and achieve improved Effects of electrochemical kinetic performance, enhanced stability, and improved rate capability

Active Publication Date: 2022-08-09
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel ternary materials still have disadvantages such as poor cycle performance, poor rate performance, and a decrease in operating voltage as the cycle increases. The improvement of the above performance will significantly enhance the competitive advantage of high-nickel ternary materials.

Method used

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  • A kind of high nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • A kind of high nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • A kind of high nickel ternary lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh reactants such as 0.01mol lithium chloride, 0.009mol nickel nitrate, 0.0005mol cobalt nitrate, 0.0005mol scandium nitrate and 0.02mol citric acid, put them all into a 200mL beaker, add 100mL distilled water, and then add The beaker was moved to a water bath at 80°C, and the reaction was performed with stirring until a gel formed.

[0023] (2) drying the gel obtained in step (1), then transferring the dried gel to a muffle furnace, heating to 800°C at a heating rate of 5°C / min and maintaining a constant temperature for 6 hours, and then cooling naturally, Get LiNi 0.9 Co 0.05 Sc 0.05 O 2 . figure 1 is the X-ray diffraction pattern of the material.

[0024] The prepared lithium ion battery cathode material LiNi 0.9 Co 0.05 Sc 0.05 O 2 , acetylene black and PVDF are ground and mixed evenly at a mass ratio of 8:1:1, drop an appropriate amount of NMP to make electrode slurry, and then coat and grind the slurry evenly on aluminum foil, and place it in a vac...

Embodiment 2

[0026] (1) Weigh reactants such as 0.01mol lithium nitrate, 0.0087mol nickel nitrate, 0.0005mol cobalt nitrate, 0.0008mol scandium nitrate and 0.02mol tartaric acid, put them all into a 200mL beaker, add 100mL distilled water, and then transfer the beaker In a water bath at 80°C, react with stirring until a gel forms.

[0027] (2) drying the gel obtained in step (1), then transferring the dried gel to a muffle furnace, heating to 800°C at a heating rate of 5°C / min and maintaining a constant temperature for 6 hours, and then cooling naturally, Get LiNi 0.87 Co 0.05 Sc 0.08 O 2 . figure 2 is the X-ray diffraction pattern of the material. image 3 SEM image of the material.

[0028] The prepared lithium ion battery cathode material LiNi 0.87 Co 0.05 Sc 0.08 O 2 , acetylene black and PVDF are ground and mixed evenly at a mass ratio of 8:1:1, drop an appropriate amount of NMP to make electrode slurry, and then coat and grind the slurry evenly on aluminum foil, and place ...

Embodiment 3

[0030] (1) Weigh reactants such as 0.015mol lithium chloride, 0.01275mol nickel chloride, 0.0015mol cobalt nitrate and 0.00075mol scandium nitrate and 0.03mol citric acid, put them all into a 200mL beaker, add 120mL distilled water, then Move the beaker to a water bath at 80°C and react with stirring until a gel forms.

[0031] (2) drying the gel obtained in step (1), then transferring the dried gel to a muffle furnace, heating to 800°C at a heating rate of 5°C / min and maintaining a constant temperature for 6 hours, and then cooling naturally, Get LiNi 0.85 Co 0.1 Sc 0.05 O 2 .

[0032] The prepared lithium ion battery cathode material LiNi 0.85 Co 0.1 Sc 0.05 O 2 , acetylene black and PVDF are ground and mixed evenly at a mass ratio of 8:1:1, drop an appropriate amount of NMP to make electrode slurry, and then coat and grind the slurry evenly on aluminum foil, and place it in a vacuum drying oven at 120 °C. It was fully dried in the middle and cut into a foil with a di...

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Abstract

The invention discloses a high-nickel ternary lithium ion battery positive electrode material and a preparation method thereof. Adopt Sc 3+ Doping strategy to prepare high-nickel ternary lithium-ion battery cathode material LiNi by sol-gel method x Co y Sc z O 2 (0.85≤x≤0.90, y≤0.1, z≤0.1 and x+y+z=1), Sc doping reduces the degree of lithium-nickel ion mixing and enhances the stability of the crystal structure, improving LiNi x Co y Sc z O 2 The cycle performance is excellent; the chelating agent is used to achieve uniform mixing of the reaction raw materials at the molecular level, reducing the reaction temperature and shortening the reaction time, which is beneficial to obtain LiNi with fine particles. x Co y Sc z O 2 , significantly shortening Li ions in LiNi x Co y Sc z O 2 The diffusion path inside the solid particles improves the electrochemical kinetic properties of lithium ions and improves the rate performance of the material, which has the advantages of high capacity, long life and excellent rate performance.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and particularly relates to a positive electrode material for a high-nickel ternary lithium ion battery and a preparation method thereof. Background technique [0002] Due to its many advantages such as high energy density, long life and low self-discharge rate, lithium-ion batteries dominate the secondary battery market and are widely used in emerging high-tech portable electronic devices such as mobile phones, notebook computers, and power tools. And it has broad application prospects and potential huge economic benefits in the defense industry, electric vehicles, space technology and other fields. [0003] However, with the rapid development of economy and technology, people's performance requirements for lithium-ion batteries are constantly increasing, and the current low energy density of lithium-ion battery cathode materials is difficult to meet people's requirements for high-perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/485H01M10/0525C01G53/00
CPCH01M4/525H01M4/485H01M10/0525C01G53/50C01P2002/72C01P2004/03Y02E60/10
Inventor 陈权启陈卓李文娜高能双李赫琛孙瑞聪
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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