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Ternary material, preparation method thereof and lithium ion battery

A lithium-ion battery and ternary material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow lithium ion diffusion rate, poor material rate performance and low-temperature discharge performance, and difficulty in satisfying power batteries, etc., to achieve Good high temperature cycle performance and low temperature discharge performance, high specific capacity, high rate performance effect

Active Publication Date: 2021-06-29
HUIZHOU BYD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, single crystal material has become a mainstream, which has the advantages of good structural stability, good high temperature cycle performance, good safety, and can be used under high voltage; however, the interior of single crystal material is a relatively regular crystal, which basically does not exist The diffusion rate of lithium ions in the grain boundary is very slow, resulting in a lower performance of the specific capacity of the single crystal material compared with the secondary ball material under the same metal ratio, and the rate performance and low temperature discharge performance of the material are poor. , it is difficult to meet the needs of power batteries

Method used

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  • Ternary material, preparation method thereof and lithium ion battery
  • Ternary material, preparation method thereof and lithium ion battery
  • Ternary material, preparation method thereof and lithium ion battery

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preparation example Construction

[0036] The preparation method of the present disclosure controls the BET specific surface area, sintering and crushing parameters of the precursor in the preparation process, so that the prepared ternary material has uniform particle size distribution and high mesoporosity, thereby having high specific capacity and high rate performance And good high temperature cycle performance and low temperature discharge performance.

[0037] In a specific embodiment according to the present disclosure, the method further includes: adding a doping solution to the co-precipitation solution to enhance the high-temperature cycle performance of the material, and the doping solution may contain Mg, Al, Ti, W, Y and One or more of Zr elements, preferably one or more of Mg, Ti and Zr elements, the disclosure does not limit the type of doping solution containing the above elements, preferably MgCl 2 solution, TiCl 4 solution and Zr(SO 4 ) 2 One or more of them in the solution. The pH of the c...

Embodiment 1

[0047] NiSO 4 ·6H 2 O, MnSO 4 4H 2 O. CoSO 4 ·6H 2 O is dissolved in deionized water and prepared as a reaction feed solution for subsequent use; sodium hydroxide is dissolved in deionized water to prepare a precipitant for subsequent use; ammonia water is prepared as a complexing agent for subsequent use; TiCl is prepared 4 and MgCl 2 The mixed solution is used as a doping solution for later use.

[0048] At the beginning of the co-precipitation reaction, ammonia water is first added to the deionized water as a complexing agent, and then the reaction feed liquid and a precipitating agent are added through a peristaltic pump. The precipitating agent is sodium hydroxide solution. NiSO 4 , MnSO 4 、CoSO 4 The flow rate of the solution is controlled according to the molar ratio of 6:2:2. After adjusting the valve and flow meter, it enters the reactor for stirring and mixing reaction. The amount of the precipitating agent and the complexing agent is controlled to maintain...

Embodiment 2

[0054] The ternary material was prepared by the method of Example 1, the only difference being: the temperature of the first constant temperature section in the first sintering was 780°C, and the time was 8.5h; the temperature of the second constant temperature section was 780°C, and the time was 10.5h ; The temperature of the third constant temperature section is 880°C, and the time is 10.5h; the temperature of the first heating section is 200-580°C, and the time is 3.5h; the temperature of the second heating section is 580-780°C, and the time is 3.5h; The temperature of the third heating section is 780-880°C, and the time is 3.5h; the temperature of the first cooling section is 880-700°C, and the time is 4.5h; the temperature of the second cooling section is 700-200°C, and the first The cooling time is 5h.

[0055] D of the resulting ternary material 99 11 μm, D 50 5.0 μm, D 1 The average pore diameter is 6nm, the porosity is 6%, and the volume ratio of pores with a pore ...

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Abstract

The invention relates to a ternary material, a preparation method thereof and a lithium ion battery. The ternary active component of the ternary material contains a substance with a chemical formula of LiNixCoyMn1-x-yO2, wherein x is more than or equal to 0.5 and less than or equal to 0.9, and y is more than or equal to 0.05 and less than or equal to 0.2; D99 of the ternary material is less than or equal to 15 [mu]m, and D50 is 4.5-5.5 [mu]ms; and the average pore size is 3-20 nm, and the volume ratio of pores with the pore size smaller than 8 nm to all pores is 5-30%. According to the scheme disclosed by the invention, the prepared ternary material has uniform particle size distribution and high mesoporous rate by regulating and controlling the BET specific surface area and sintering and crushing parameters of the precursor in the preparation process, so that the ternary material has high specific capacity, high rate performance and good high-temperature cycle performance and low-temperature discharge performance.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion battery materials, and in particular, to a ternary material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Ternary materials are divided into single crystal materials and secondary spherical materials in terms of morphology. At present, single crystal materials have become a mainstream, which has the advantages of good structural stability, good high temperature cycle performance, good safety, and can be used under high voltage; however, single crystal materials are relatively regular crystals inside, which basically do not exist. At the grain boundary, the diffusion rate of lithium ions in the interior is very slow, resulting in a lower specific capacity of the single crystal material compared with the secondary spherical material under the same metal ratio, and the material has poor rate performance and low temperature discharge performance. , it is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈娜阮泽文田业成郝嵘潘仪
Owner HUIZHOU BYD IND
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