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Negative electrode material and preparation method and application thereof

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

Active Publication Date: 2021-08-27
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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  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof

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Effect test

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 and a preparation method and application thereof. The negative electrode material comprises an inner core, a first carbon coating layer coating 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, the chemical formula of the amorphous lithium-silicon alloy is LixSi, and x is more than 1 and less than or equal to 4.4. The surface of the lithium-silicon alloy is subjected to double-layer carbon coating, so that the performance of the lithium-silicon alloy core is hardly attenuated in dry air, and the negative electrode material has relatively good 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 Applications(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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