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Silicon-based negative electrode material and preparation method and application thereof

A technology of silicon-based negative electrode materials and silicon crystals, which is applied in the direction of negative electrodes, battery electrodes, and active material electrodes, can solve the problems of low initial efficiency, large volume expansion, and poor cycle performance, so as to reduce the occurrence of side reactions and improve Effects of conductivity, improvement of cycle performance and efficiency

Pending Publication Date: 2022-03-04
江西紫宸科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to further reduce SiO x The volume expansion of materials, the research on silicon-based negative electrodes mainly focuses on the nanoparticle structure design of the silicon body, the porous three-dimensional structure design of the bulk phase, the interface and surface structure design, SiO x / C core-shell structure and stable carrier design, carbon coating / compositing, etc., but there is no good way to solve the problem of low efficiency, large volume expansion and cycle performance of existing silicon-based negative electrode materials. bad question

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  • Silicon-based negative electrode material and preparation method and application thereof
  • Silicon-based negative electrode material and preparation method and application thereof
  • Silicon-based negative electrode material and preparation method and application thereof

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Embodiment 1

[0068]This embodiment provides a silicon-based negative electrode material, which includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer coated on the surface of the first carbon coating layer ;

[0069] The inner core includes a solid part and a porous part sequentially from the inside to the outside, and the inner core includes silicon grains and silicon-oxygen materials.

[0070] The preparation method of the silicon-based negative electrode material is as follows:

[0071] (1) The raw material SiO 1.2 The powder is put into the reaction furnace, acetylene gas is passed through, the temperature is raised to 800°C, and the gas phase coating is carried out to obtain the silicon oxide C-SiO containing the first carbon coating layer. 1.2 , the measured carbon content is 2.3%;

[0072] (2) the C-SiO in step (1) 1.2 Heat treatment at 1000°C for 10 hours under argon atmosphere, and cool to room temperatur...

Embodiment 2

[0084] This embodiment provides a silicon-based negative electrode material, which includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer coated on the surface of the first carbon coating layer ;

[0085] The inner core includes a solid part and a porous part sequentially from the inside to the outside, and the inner core includes silicon grains and silicon-oxygen materials.

[0086] The preparation method of the silicon-based negative electrode material is as follows:

[0087] (1) The raw material SiO 1.2 The powder is put into the reaction furnace, acetylene gas is passed through, the temperature is raised to 800°C, and the gas phase coating is carried out to obtain the silicon oxide C-SiO containing the first carbon coating layer. 1.2 , the measured carbon content is 2.3%;

[0088] (2) the C-SiO in step (1) 1.2 Heat treatment at 1000°C for 5 hours under argon atmosphere, and cool to room temperatur...

Embodiment 3

[0094] This embodiment provides a silicon-based negative electrode material, which includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer coated on the surface of the first carbon coating layer ;

[0095] The inner core includes a solid part and a porous part sequentially from the inside to the outside, and the inner core includes silicon grains and silicon-oxygen materials.

[0096] The preparation method of the silicon-based negative electrode material is as follows:

[0097] (1) The raw material SiO 1.2 The powder is put into the reaction furnace, acetylene gas is introduced, the temperature is raised to 700°C, and the gas phase coating is carried out to obtain the silicon oxide C-SiO containing the first carbon coating layer. 1.2 , the measured carbon content is 2.7%;

[0098] (2) the C-SiO in step (1) 1.2 Heat treatment at 950°C for 5 hours under argon atmosphere, and cool to room temperature wit...

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Abstract

The invention provides a silicon-based negative electrode material and a preparation method and application thereof. The silicon-based 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 coating the surface of the first carbon coating layer, the inner core sequentially comprises a solid part and a porous part from inside to outside, and the inner core comprises silicon crystal grains and a silica material. According to the silicon-based negative electrode material provided by the invention, the porous structure in the core of the silicon-based negative electrode material provides a space for the volume effect of the silicon oxide in the charge-discharge process, and meanwhile, the first carbon coating layer and the second carbon coating layer improve the conductivity of the silicon-based negative electrode material on one hand, and on the other hand, the carbon layer is not damaged when the porous structure is formed; according to the preparation method, the conductivity is improved, the specific surface area after etching is reduced, side reactions in a subsequent battery are reduced, and the negative electrode material has relatively high capacity and stable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a silicon-based negative electrode material and a preparation method and application thereof. Background technique [0002] Silicon material is considered as a new type of high-performance lithium-ion battery anode material because of its advantages such as high specific capacity, good safety and low temperature resistance, and abundant raw material sources. However, during the charge and discharge process, the silicon material has a huge volume expansion due to lithium alloying, resulting in the failure of the pulverization of the silicon active particles, and at the same time, the cracking and pulverization of the silicon particles makes the electrical contact between the active particles and the current collector poor, forming an "island effect". ", the fracture surface repeatedly forms a new solid electrolyte interface (SEI), which induces the problem of continuou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/625H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 李婷冯苏宁刘芳李辉顾华清
Owner 江西紫宸科技有限公司
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