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Pre-lithiated silicon-based negative electrode material as well as preparation method and application thereof

A pre-lithiated silicon-based, negative electrode material technology, applied in the direction of negative electrode, silicon oxide, battery electrode, etc., can solve the problems of unfavorable large-scale production, extremely high operating environment requirements, high lithium powder activity, and shorten the lithium intercalation. path, improve structural stability, improve cycle life effect

Inactive Publication Date: 2021-12-31
北京胜能能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lithium powder used in the method has high activity and has extremely high requirements on the operating environment, which is not conducive to large-scale production

Method used

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  • Pre-lithiated silicon-based negative electrode material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0052] This embodiment provides a silicon-oxygen negative electrode material (commercial silicon oxide material SiO x ), the silicon-oxygen negative electrode material includes a silicon-oxygen material intercalating lithium inside and a fluorine-containing SEI film on the surface of the silicon-oxygen material.

[0053] The preparation method of the negative electrode material is as follows:

[0054] In the glove box, lithium flakes were added to a 0.5 mol / L solution of 4,4'-dimethylbiphenyl (4,4'-DMBP) in methyl butyl ether, where Li was mixed with 4, The molar ratio of 4'-DMBP is set to 4:1, and the Li-4,4'-DMBP complex is obtained by fully stirring, which is used as a chemical pre-lithiation solution; lithium hexafluorophosphate is added to the above solution to form a fluorine-containing chemical pre-lithium Lithium hexafluorophosphate accounts for 3% of the mass ratio of the solution to obtain a fluorine-containing Li-arene compound solution;

[0055] Put silicon-oxyge...

Embodiment 2

[0057] The difference between this example and Example 1 is that the aromatic hydrocarbon in this example is 4-methylbiphenyl (4-MBP).

[0058] All the other preparation methods and parameters are consistent with Example 1.

Embodiment 3

[0060] The difference between this example and Example 1 is that the aromatic hydrocarbon in this example is 3,3',4,4'-tetramethylbiphenyl (3,3',4,4'-TMBP).

[0061] All the other preparation methods and parameters are consistent with Example 1.

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Abstract

The invention provides a pre-lithiated silicon-based negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: pre-lithiating a fluorine-containing Li-aromatic compound solution and a micron-sized silicon-based material, and carrying out solid-liquid separation to obtain the pre-lithiated silicon-based negative electrode material. The negative electrode material comprises a silicon-based material with lithium embedded inside and a fluorine-containing SEI film located on the surface of the silicon-based material. The fluorine-containing Li-arene compound solution and the silicon-based negative electrode material are subjected to pre-lithiation, pre-lithiation of the silicon-based negative electrode material on the material level is achieved, meanwhile, the fluorine-containing artificial SEI film is introduced to the surface of the silicon-based negative electrode material, the structural stability of the material in the charging and discharging process is improved, so that the service life of the battery is prolonged. And the pre-lithiation of the negative electrode can be quickly and uniformly realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a pre-lithiated silicon-based negative electrode material and its preparation method and application, in particular to a pre-lithiated silicon-oxygen negative electrode material and its preparation method and application. Background technique [0002] At present, the consumer market has higher and higher requirements for the cruising range and energy consumption per unit mileage of electric vehicles, which makes the research and development of power batteries more and more efforts in the direction of high energy density. From the perspective of materials, the means to increase the energy density of batteries mainly include: increasing the specific capacity of the positive electrode material, increasing the working voltage of the positive electrode material, and increasing the specific capacity of the negative electrode. Among them, the improvement of the specific capa...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525C01B33/113
CPCH01M4/366H01M4/483H01M4/628H01M10/0525C01B33/113C01P2004/80C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 周昊高敏侯艳丽李玉军
Owner 北京胜能能源科技有限公司
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