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A kind of negative electrode material and its preparation method and use

A negative electrode material and matrix technology, applied in the field of negative electrode materials and their preparation, can solve the problems of material expansion and other performance effects, large lithium-silicon alloy particle size, slow reaction speed, etc., to achieve good cycle stability and synthesis reaction speed Fast, low environmental requirements

Active Publication Date: 2022-05-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it has high requirements on the environment, and generally needs to be synthesized in a glove box, and the reaction speed is slow
Moreover, the obtained lithium-silicon alloy has large particle size and low purity, which has a great influence on the expansion and other properties of the material

Method used

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  • A kind of negative electrode material and its preparation method and use
  • A kind of negative electrode material and its preparation method and use
  • A kind of negative electrode material and its preparation method and use

Examples

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Embodiment 1

[0065] This embodiment provides a negative electrode material, the negative electrode material includes the negative electrode material includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer located on the outermost layer;

[0066] Wherein, the inner core is an amorphous lithium-silicon alloy with a grain size of 100 nm, and the chemical formula of the amorphous lithium-silicon alloy is Li 12 Si 7 , the thickness of the first carbon coating layer is 20nm, and the thickness of the second carbon coating layer is 50nm.

[0067] The preparation method of the negative electrode material is as follows:

[0068] (1) Put 5g of nano-silicon with a particle size of 60nm into a CVD furnace, first pass into argon for replacement, then pass into methane for vapor phase deposition, the deposition temperature is 900 ° C, and the time is 1h to obtain the first substrate;

[0069] (2) Add LiH and the first matrix into t...

Embodiment 2

[0073] This embodiment provides a negative electrode material, the negative electrode material includes the negative electrode material includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer located on the outermost layer;

[0074] Wherein, the inner core is an amorphous lithium-silicon alloy with a particle size of 120 nm, and the chemical formula of the amorphous lithium-silicon alloy is Li 3.25 Si 1 , the thickness of the first carbon coating layer is 40nm, and the thickness of the second carbon coating layer is 60nm.

[0075] The preparation method of the negative electrode material is as follows:

[0076] (1) Put 5g of nano-silicon with a particle size of 100nm into a CVD furnace, first pass into argon for replacement, and then pass into acetylene for vapor phase deposition, the deposition temperature is 1100 ° C, and the time is 4h to obtain the first substrate;

[0077] (2) Add LiH and the first ...

Embodiment 3

[0080] This embodiment provides a negative electrode material, the negative electrode material includes the negative electrode material includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer located on the outermost layer;

[0081] Wherein, the inner core is a lithium-silicon alloy with a particle size of 100 nm, and the chemical formula of the lithium-silicon alloy is Li 3.75 Si, the thickness of the first carbon coating layer is 30nm, and the thickness of the second carbon coating layer is 80nm.

[0082] The preparation method of the negative electrode material is as follows:

[0083] (1) Put 5g of nano-silicon with a particle size of 70nm into a CVD furnace, first pass into argon for replacement, and then pass into ethylene for vapor phase deposition, the deposition temperature is 950 ° C, and the time is 2h to obtain the first substrate;

[0084] (2) Add LiH and the first matrix into the mixer at a m...

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Abstract

The invention provides a negative electrode material, a preparation method and application thereof. The negative electrode material includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer located on the outermost layer; wherein, the inner core is an amorphous lithium-silicon alloy, and the amorphous The chemical formula of lithium silicon alloy is Li x Si, 1<x≤4.4. In the present invention, double-layer carbon coating is carried out on the surface of the lithium-silicon alloy, so that the performance of the lithium-silicon alloy core is hardly attenuated in dry air, and the negative electrode material can have better environmental stability and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode material and a preparation method and application thereof. Background technique [0002] With the continuous improvement of the energy density and other comprehensive performance requirements of power batteries, the theoretical capacity of natural graphite and artificial graphite anode materials is 372mAh / g, and it can reach 360mAh / g at present, and it is difficult to increase the capacity of the anode. Graphite anode materials have been difficult to meet the requirements of high energy density batteries. Although nano-silicon and silicon oxide also have high specific capacity, the theoretical specific capacity of nano-silicon negative electrode material is as high as 4200mAh / g (Li 4.4 Si), but the volume expansion is as high as 300% or more during the lithium intercalation process, which will not only destroy the structure of the electrode, caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/40H01M4/62H01M4/04H01M10/0525
CPCH01M4/366H01M4/386H01M4/405H01M4/628H01M4/0428H01M4/0471H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 彭友山胡涛
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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