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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 reduced working voltage, poor cycle performance and poor rate performance of high-nickel ternary materials, and achieve enhanced Stability, improving electrochemical kinetic performance, and improving the effect of rate performance

Active Publication Date: 2021-08-27
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • 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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  • High-nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • High-nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • 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 The beaker was moved to a water bath at 80°C, and reacted while stirring until a gel was formed.

[0023] (2) Dry the gel obtained in step (1), then transfer the dried gel to a muffle furnace, heat to 800°C at a heating rate of 5°C / min and keep the temperature constant for 6 hours, and then cool 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, and an appropriate amount of NMP is added dropwise to make electrode slurry, and then the slurry is evenly coated on aluminum foil, and placed in a vacuum oven at 120°C Fully d...

Embodiment 2

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

[0027] (2) Dry the gel obtained in step (1), then transfer the dried gel to a muffle furnace, heat to 800°C at a heating rate of 5°C / min and keep the temperature constant for 6 hours, and then cool 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 A scanning electron microscope 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, and an appropriate amount of NMP is added dropwise to make electrode slurry, and then the slurry is evenly coat...

Embodiment 3

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

[0031] (2) Dry the gel obtained in step (1), then transfer the dried gel to a muffle furnace, heat to 800°C at a heating rate of 5°C / min and keep the temperature constant for 6 hours, and then cool 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, and an appropriate amount of NMP is added dropwise to make electrode slurry, and then the slurry is evenly coated on aluminum foil, and placed in a vacuum oven at 120°C Fully dry in the medium, cut into a foil with a diameter of 15mm as the re...

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Abstract

The invention discloses a high-nickel ternary lithium ion battery positive electrode material and a preparation method thereof. The high-nickel ternary lithium ion battery positive electrode material LiNixCoySczO2 (x is greater than or equal to 0.85 and less than or equal to 0.90, y is less than or equal to 0.1, z is less than or equal to 0.1, and x + y + z = 1) is prepared by adopting a Sc3+ doping strategy, the mixed arrangement degree of lithium and nickel ions is reduced by Sc doping, the stability of a crystal structure is enhanced, and the cycle performance of LiNixCoySczO2 is improved; the chelating agent is utilized to realize uniform mixing of the reaction raw materials on the molecular level, reduce the reaction temperature and shorten the reaction time, so that LiNixCoySczO2 with fine particles can be obtained, the diffusion path of lithium ions in the LiNixCoySczO2 solid particles is remarkably shortened, the electrochemical dynamic performance of the lithium ions is improved, the rate capability of the material is improved, and the material has the advantages of high capacity, long service life and excellent rate capability.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a high-nickel ternary lithium-ion battery cathode material 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 occupy a dominant position in the secondary battery market and are widely used in emerging high-tech portable electronic devices such as mobile phones, laptops, and power tools. And it has broad application prospects and potential huge economic benefits in defense industry, electric vehicle, space technology and other fields. [0003] However, with the rapid development of economy and technology, people's requirements for the performance of lithium-ion batteries continue to increase, but the current low energy density of lithium-ion battery cathode materials is difficult to meet people's requirements for high-performance l...

Claims

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Application Information

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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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