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Lithium battery positive electrode material surface transmission efficiency regulation and control method and obtained positive electrode material

A technology for positive electrode materials and transmission efficiency, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor stability, poor sustainability, and incompatibility of the coating layer, and achieve the elimination of interface incompatibility , easy commercial application, low cost effect

Inactive Publication Date: 2021-03-26
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cladding layer formed by this preparation method is a layered structure, that is, the PEG cladding layer is coated on the surface of the LMP core, and then the PTh layer is coated on the PEG cladding layer. The boundary is clear and incompatible, and the stability of the coating layer is poor. During the long-term cycle, there will be problems such as fragmentation and shedding. The improvement of LMP cycle performance is limited, and the sustainability is not strong. Further optimization and improvement are needed

Method used

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  • Lithium battery positive electrode material surface transmission efficiency regulation and control method and obtained positive electrode material
  • Lithium battery positive electrode material surface transmission efficiency regulation and control method and obtained positive electrode material
  • Lithium battery positive electrode material surface transmission efficiency regulation and control method and obtained positive electrode material

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Embodiment 1

[0030] A method for controlling the surface transmission efficiency of a lithium battery positive electrode material, comprising the following steps:

[0031] S1. Weigh 0.01g of PEG and 0.01g of PANI and fully dissolve in 4mL of NMP solvent to form a transparent mixed solution;

[0032] S2, adding 1 g of NCM811 to the mixed solution to prepare a suspension;

[0033] S3. The suspension is heated and stirred until uniform, and baked in an oven at 110°C. After the solvent is completely evaporated, a black dry powder is obtained, which is the final coated positive electrode material.

[0034] Such as figure 1 As shown, the XRD test shows that the positive electrode material prepared in Example 1 still retains the original crystal structure. Such as figure 2 As shown, the SEM test shows that the surface of the positive electrode material has a polymer composite coating layer, and the coating structure is compact and complete, and there is no obvious layering or sub-regional int...

Embodiment 2

[0036] A method for controlling the surface transmission efficiency of a lithium battery positive electrode material, comprising the following steps:

[0037]S1. Weigh 0.015g of PANI and 0.01g of PVP into 4mL of NMP and ultrasonically form a transparent mixed solution;

[0038] S2, 1g of LiFePO 4 Add to the mixed solution to configure the suspension;

[0039] S3. Stir evenly with a magnetic stirrer, then heat the suspension to volatilize all the solvent, and finally obtain dry powder, which is the coated positive electrode material.

Embodiment 3

[0041] A method for controlling the surface transmission efficiency of a lithium battery positive electrode material, comprising the following steps:

[0042] S1. Weigh 0.01g of PEG and 0.02g of PA and fully dissolve them in 4mL of absolute ethanol to form a transparent mixed solution;

[0043] S2, adding 1 g of NCM622 to the mixed solution to configure a suspension;

[0044] S3. Using a magnetic stirrer to heat and stir evenly until the solvent in the mixed solution is evaporated to dryness to obtain dry powder, which is ground to obtain the final coated positive electrode material.

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Abstract

The invention discloses a lithium battery positive electrode material surface transmission efficiency regulation and control method and an obtained positive electrode material. The method comprises the following steps: S1, uniformly mixing two or more polymers according to a certain ratio to obtain a polymer mixed solution; S2, dispersing a lithium battery positive electrode material into the polymer mixed solution to obtain a suspension; and S3, heating the suspension, and drying a powder to obtain the final polymer-coated lithium battery positive electrode material. A polymer composite coating layer is formed on the surface of the positive electrode material, the elasticity of the polymer and a cross-linking property between two or more polymers are utilized, a defect of interface incompatibility is eliminated while multiple electron / ion channels are constructed, the compactness and completeness of a coating structure are realized, and different polymers are coated so that electron / ion transmission efficiency of an interface can be regulated and controlled. The method is simple, convenient, low in cost and high in raw material selectivity. Universality is high, and a commercial application is easy.

Description

technical field [0001] The invention relates to the technical field of modification of positive electrode materials of lithium ion batteries, in particular to a method for regulating the surface transmission efficiency of positive electrode materials of lithium batteries and the obtained positive electrode materials. Background technique [0002] As the most promising secondary battery, lithium-ion batteries are widely used in small portable electronic products and electric vehicles. In 2017, the Ministry of Industry and Information Technology and other four ministries and commissions jointly promulgated the "Action Plan for Promoting the Development of Automobile Power Batteries", requiring that by 2020, the specific energy of a new type of lithium-ion power battery will exceed 300Wh / kg, and the specific energy of the system will strive to reach 260Wh / kg. 1 yuan / Wh or less; by 2025, the specific energy of a single power battery will reach 500wh / kg. Cathode material is the ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/58H01M10/04H01M10/0525
CPCH01M4/505H01M4/525H01M4/5825H01M4/624H01M4/628H01M10/0427H01M10/0525H01M2004/021H01M2004/028Y02E60/10Y02P70/50
Inventor 王敬谭国强原强苏岳锋吴锋
Owner 北京理工大学重庆创新中心
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