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Silicon-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery

A silicon-based negative electrode material and silicon-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrical conductivity of silicon oxide, difficulty in meeting application requirements, and low initial Coulombic efficiency, etc., to improve electrical conductivity , Improve the reversible capacity and alleviate the effect of volume expansion

Active Publication Date: 2021-06-11
新疆硅基新材料创新中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide itself has problems such as poor conductivity, large volume expansion, and low initial Coulombic efficiency, so it is difficult to directly apply it to lithium-ion batteries.
[0004] In order to solve the above problems, at present, gas-phase or liquid-phase methods are generally used for carbon coating, or nano-modification, or metal doping to improve its electrochemical performance, but the effect is not obvious, and the reversible capacity is generally low. At 1500mAh / g, the coulombic efficiency is lower than 75%, and the cycle performance is poor, which is still difficult to meet the application requirements

Method used

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  • Silicon-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery
  • Silicon-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery
  • Silicon-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery

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preparation example Construction

[0044] In the prior art, the negative electrode materials of lithium ion batteries have problems such as poor electrical conductivity, large volume expansion effect, and poor cycle performance. Therefore the present invention provides a kind of preparation method of silicon-based negative electrode material of lithium ion battery, comprising,

[0045] Taking silicon oxide as a raw material,

[0046] Firstly, the silicon oxide raw material is subjected to surface modification treatment,

[0047] Then, the silicon-based capacity unit is prepared by combining the surface-modified silicon oxide with few-layer graphene,

[0048]Then the silicon-based capacity unit and the carbon-based material are mixed to prepare the silicon-based negative electrode material.

[0049] Correspondingly, the present invention also provides a silicon-based negative electrode material for a lithium-ion battery, which is prepared by the above-mentioned method.

[0050] Correspondingly, the present in...

Embodiment 1

[0053] This embodiment discloses a method for preparing a silicon-based negative electrode material for a lithium-ion battery, comprising: taking silicon oxide as a raw material, first performing surface modification treatment on the silicon oxide raw material; A few-layer graphene is combined to prepare a silicon-based capacity unit; then the silicon-based capacity unit is mixed with a carbon-based material to obtain a silicon-based negative electrode material product.

[0054] The method of this embodiment specifically includes the following steps:

[0055] S1, surface modification treatment: take the silicon oxide raw material, use carbon source A to pre-coat the silicon oxide raw material, and / or use the doping source to perform ion doping treatment on the silicon oxide raw material, to obtain Modified silica.

[0056] In this embodiment, silicon oxide raw materials with a particle size of 3-12 μm are preferably used. Pre-coating treatment refers to the deposition of a n...

Embodiment 2

[0079] This embodiment discloses a method for preparing a silicon-based negative electrode material for a lithium-ion battery, which includes first adopting a gas phase method, using acetylene as a gas carbon source (i.e. carbon source A1), and modifying the surface of silicon oxide to A dense nano-carbon layer is formed on the surface, and then the modified silicon oxide is used to prepare a silicon-based capacity unit and further prepare a silicon-based negative electrode material.

[0080] The specific steps of the preparation method of this embodiment are as follows:

[0081](1) Take 5kg of silicon oxide raw material, put it into CVD (chemical vapor deposition) equipment, heat it to 950°C, and keep it warm, wherein the heating rate is preferably 5°C / min, and the holding time is preferably 15min. Then feed acetylene and argon into the CVD equipment to decompose acetylene at 950°C and argon and deposit it on the surface of silicon oxide to form a nano-carbon layer (single ca...

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Abstract

The invention discloses a preparation method of a silicon-based negative electrode material, which comprises the following steps: taking silicon monoxide as a raw material, firstly carrying out surface modification treatment on the silicon monoxide raw material, then combining the silicon monoxide subjected to surface modification treatment with few layers of graphene to prepare a silicon-based capacity unit, and then mixing the silicon-based capacity unit with a carbon-based material to prepare the silicon-based negative electrode material. The invention also discloses the silicon-based negative electrode material of the lithium ion battery prepared by the method, a negative electrode containing the silicon-based negative electrode material, and the lithium ion battery. The reversible capacity and coulombic efficiency of the lithium ion battery can be improved, and volume expansion is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a silicon-based negative electrode material, a preparation method, a negative electrode, and a lithium-ion battery. Background technique [0002] With the rapid development of the new energy industry, the market has a strong demand for lithium-ion batteries with high battery energy density, and the key to improving the energy density of lithium-ion batteries is to develop high-energy-density lithium-ion battery materials. [0003] In terms of negative electrode materials, the capacity of traditional graphite negative electrode materials has very limited room for improvement, while silicon oxide has a high theoretical reversible capacity (>2500mAh / g), and the volume effect (<150%) is much smaller than that of silicon. 300%, which has a unique advantage over silicon materials. However, silicon oxide itself has problems suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/386H01M10/0525Y02E60/10
Inventor 石佳光范协程袁芳伟李硕胡保平赵志宇刘朗
Owner 新疆硅基新材料创新中心有限公司
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