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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, carbon preparation/purification, etc., can solve the problems of low specific capacity and stability, improve specific capacity and stability, and improve bonding degree. Effect

Active Publication Date: 2020-09-15
东莞市鸿德电池有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the negative electrode materials disclosed in documents 1 to 4, it can be seen that the negative electrode materials in the related art have the defects of low specific capacity and low stability.

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

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preparation example Construction

[0045] Such as image 3 Shown, the preparation method of this lithium-ion battery negative electrode material comprises the following steps:

[0046] S1. Preparation of pyrolytic carbon-carbon fiber composites with a scale of 5-12 microns and a core-shell structure: pass inert gas and carbon source gas into the carbon fibers, and process the carbon fibers and carbon source gas at high temperature to obtain 5-12 microns Pyrolytic carbon-carbon fiber composites with a core-shell structure.

[0047] Wherein, the inert gas may be argon, and the carbon source gas may be methane; the flow rate of the carbon source gas may be 0.2-0.5 L / min; the flow rate of the inert gas may be 0.5-1.0 L / min.

[0048] Specifically, in some embodiments, the carbon fiber can be placed in a high-temperature furnace at a temperature of 800-1000 degrees, and methane and argon can be passed through for 1-3 hours to obtain a 5-12 micron scale and a core-shell structure. pyrolytic carbon-carbon fiber compo...

Embodiment 1

[0058] (1) Put the carbon fiber in a high-temperature furnace, and treat it for 1 hour at a temperature of 800 degrees, a methane flow rate of 0.2L / min, and an argon flow rate of 0.5L / min to obtain sample A; sample A is 5-12 Pyrolytic carbon-carbon fiber composites with micron scale and core-shell structure.

[0059] (2) Mix ethyl orthosilicate and absolute ethanol in a molar ratio of 1:5, stir evenly, then add hydrochloric acid, the ratio of hydrochloric acid to ethyl orthosilicate is 1:10, continue stirring for 1 hour, and the obtained liquid Marked as B; B is the liquid precursor containing silicon-silicon carbide composite nanowires.

[0060] Soak sample A in liquid B, immerse at room temperature for 36 hours, and dry naturally in the air to obtain a sample marked as C; where C is a pyrolytic carbon-carbon fiber composite mixed with a liquid precursor.

[0061] Sample C was placed in an argon atmosphere, under the condition of 1000 degrees, high-temperature heat treatment...

Embodiment 2

[0066] (1) Put the carbon fiber in a high-temperature furnace, and treat it for 3 hours at a temperature of 1000 degrees, a methane flow rate of 0.5L / min, and an argon flow rate of 1.0L / min to obtain sample A; sample A is 5-12 Pyrolytic carbon-carbon fiber composites with micron scale and core-shell structure.

[0067] (2) Mix ethyl orthosilicate and absolute ethanol in a molar ratio of 1:2, stir evenly, then add hydrochloric acid, the ratio of hydrochloric acid to ethyl orthosilicate is 1:15, continue stirring for 2 hours, and the obtained liquid Marked as B; B is the liquid precursor containing silicon-silicon carbide composite nanowires.

[0068] Soak sample A in liquid B, immerse at room temperature for 48 hours, and dry naturally in the air to obtain a sample marked as C; where C is a pyrolytic carbon-carbon fiber composite mixed with a liquid precursor.

[0069] Sample C was placed in an argon atmosphere, subjected to high-temperature heat treatment at 1200 degrees for ...

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Abstract

The invention relates to a lithium ion battery negative electrode material and a preparation method thereof. The lithium ion battery negative electrode material comprises a pyrolytic carbon-carbon fiber complex which is of a core-shell structure and is of a 5-12 micron scale, silicon-silicon carbide composite nanowires of a 400-600 nanometer scale, silicon powder of a 100-300 nanometer scale and carbon microspheres of a 20-60 nanometer scale, wherein the pyrolytic carbon-carbon fiber complex, the silicon-silicon carbide composite nanowires, the silicon powder and the carbon microspheres are mixed to form a three-dimensional tree structure. The lithium ion battery negative electrode material is of a three-dimensional tree structure formed by mixing the pyrolytic carbon-carbon fiber complexwhich is of a core-shell structure and is of a 5-12 micron scale, the silicon-silicon carbide composite nanowires of a 400-600 nanometer scale, the silicon powder of a 100-300 nanometer scale and thecarbon microspheres of a 20-60 nanometer scale, so that the combination degree of the components can be improved, and the specific capacity and the stability of the lithium ion battery negative electrode material can be further improved.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, and more specifically, relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in smartphones, notebook computers, electric vehicles and other fields. It is mainly composed of positive electrode, negative electrode, electrolyte and separator. The traditional negative electrode material is graphite. The theoretical specific capacity of graphite is only 372mAh / g, which cannot fully meet the increasing high energy density requirements of power batteries. Therefore, it is of great practical significance to develop new lithium-ion battery anode materials with high capacity. [0003] In related documents, document 1 "A silicon-based negative electrode material and its preparation method and application" discloses a silicon-based lithium-ion battery negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525C01B32/05C04B35/83B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525C01B32/05C04B35/83B82Y30/00B82Y40/00Y02E60/10
Inventor 王文张相同盛洪超王涌凌剑龙兆乾
Owner 东莞市鸿德电池有限公司
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