A kind of ternary material and its preparation method and lithium ion battery

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

Active Publication Date: 2022-07-15
HUIZHOU BYD IND
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  • Claims
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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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  • A kind of ternary material and its preparation method and lithium ion battery
  • A kind of ternary material and its preparation method and lithium ion battery
  • A kind of ternary material and its preparation method and lithium ion battery

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preparation example Construction

[0036] The preparation method of the present disclosure enables the prepared ternary material to have uniform particle size distribution and high mesoporosity by adjusting the BET specific surface area, sintering and crushing parameters of the precursor in the preparation process, 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, 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 present disclosure does not limit the types of doping solutions containing the above elements, preferably MgCl 2 Solution, TiCl 4 Solution and Zr(SO 4 ) 2 one or more of the solutions. The pH of...

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 into a reaction feed liquid for standby use; sodium hydroxide is dissolved in deionized water to prepare a precipitant for standby use; ammonia water is prepared for standby use as a complexing agent; 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 was added to the deionized water as a complexing agent, and then the reaction feed liquid and a precipitating agent were added through a peristaltic pump, and the precipitating agent was 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 the flow meter, it enters the reactor for stirring and mixing. The amount of the precipitant and the complexing agent was controlled so that the pH of the soluti...

Embodiment 2

[0054] The ternary material was prepared by the method of Example 1, the only difference being that in the first sintering, the temperature of the first constant temperature section 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, the first cooling section is The cooling time is 5h.

[0055] D of the obtained ternary material 99 11μm, D 50 5.0µm, D 1 It is 1.1 μm, the average pore size is 6 nm, the porosity is 6%, and the volume ratio ...

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Abstract

The present disclosure relates to a ternary material, a preparation method thereof, and a lithium ion battery. The ternary active component of the ternary material contains a chemical formula of LiNi x Co y Mn 1‑x‑y O 2 , where 0.5≤x≤0.9, 0.05≤y≤0.2; D of ternary material 99 ≤15μm, D 50 The average pore size is 3-20nm, and the volume ratio of pores with a pore size below 8nm to all pores is 5-30%. The scheme of the present disclosure enables the prepared ternary material to have uniform particle size distribution and high mesoporosity by adjusting the BET specific surface area, sintering and crushing parameters of the precursor in the preparation process, so as to have high specific capacity, high rate capability 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 Patents(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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