Silicon oxide composite material and preparation method and application thereof

A composite material and silicon oxide technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of low initial charge and discharge efficiency, poor cycle life, etc., to improve the transmission rate of electrons and lithium ions, negative electrode resistance Small, efficient effect

Active Publication Date: 2019-08-06
桂林麦克斯新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a silicon oxide composite material and a preparation method thereof, so as to solve the technical problems of the existing silicon oxide as a negative electrode material with low initial charge and discharge efficiency and poor cycle life
[0006] Another object of the present invention is to provide a negative electrode and a lithium ion battery to solve the technical problems of low initial charge and discharge efficiency and poor cycle life in existing lithium ion batteries containing silicon oxide negative electrode materials

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  • Silicon oxide composite material and preparation method and application thereof
  • Silicon oxide composite material and preparation method and application thereof
  • Silicon oxide composite material and preparation method and application thereof

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preparation example Construction

[0022] On the one hand, an embodiment of the present invention provides a method for preparing a silicon oxide composite material. The preparation method of the silicon oxide composite material comprises the following steps:

[0023] Step S01. Perform ball milling and mixing treatment of silicon powder, silicon dioxide powder and aluminum salt to obtain a mixed powder;

[0024] Step S02. After mixing the mixed powder and hypochlorite, a mixed precursor is obtained;

[0025] Step S03. The mixed precursor is subjected to gradient sintering in an atmosphere containing a nitrogen source to obtain a silicon oxide composite material.

[0026] Wherein, in the step S01, the silicon powder and the silicon dioxide powder are mixed by ball milling, on the one hand, the components are fully mixed, and on the other hand, the particles of the components are uniform and small, such as nanometer to sub- Microns. In one embodiment, the ball milling speed of the ball milling mixing treatment...

Embodiment 1

[0041] Embodiment 1 provides a silicon oxide composite material and a preparation method thereof. The silicon oxide composite material is prepared according to a method comprising the following steps:

[0042] S11: Mix and grind nano-sized silicon powder and sub-micron-sized silicon dioxide powder according to the molar ratio of 1:1, and put them into a ball mill for high-energy ball milling after they are evenly ground. After 5 hours, after ball milling, pass through a 100-150 mesh sieve to collect the material to obtain a mixed powder;

[0043] S12: Then add barium lithium hypochlorite with a mass percentage of 5% of the mixed powder to the mixed powder for regrinding; the speed of ball milling is set to 3000r / min, and the ball milling time is 3 hours to obtain a mixed precursor;

[0044] S13: The mixed precursor is sintered in a tube furnace using a gradient, and the specific operation is carried out in an ammonia atmosphere to obtain a silicon oxide composite material; wh...

Embodiment 2

[0046] Embodiment 1 provides a silicon oxide composite material and a preparation method thereof. The silicon oxide composite material is prepared according to a method comprising the following steps:

[0047] S11: Mix and grind nano-sized silicon powder and sub-micron-sized silicon dioxide powder according to the molar ratio of 1:1, and put them into a ball mill for high-energy ball milling after they are evenly ground. After 5 hours, after ball milling, pass through a 100-150 mesh sieve to collect the material to obtain a mixed powder;

[0048] S12: Then add sodium hypochlorite with a mass percentage of 5% of the mixed powder to the mixed powder for regrinding; the speed of ball milling is set to 3000r / min, and the ball milling time is 3 hours to obtain a mixed precursor;

[0049] S13: The mixed precursor is sintered in a tube furnace using a gradient, and the specific operation is carried out in an ammonia atmosphere to obtain a silicon oxide composite material; wherein, t...

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Abstract

The invention provides a silicon oxide composite material and a preparation method and an application thereof. The preparation method of the silicon oxide composite material comprises the steps of carrying out ball milling and mixing treatment on silicon powder and silicon dioxide powder to obtain mixed powder; mixing the mixed powder with hypochlorite to obtain a mixed precursor; and carrying outgradient sintering treatment on the mixed precursor in an atmosphere containing a nitrogen source to obtain the silicon oxide composite material. The silicon oxide composite material prepared according to the preparation method of the silicon oxide composite material has a good electronic conductive network, thereby improving the lithium ion conduction rate, improving the conductivity of a silicon negative electrode material, and improving the structural stability and capacity retention rate.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a silicon oxide composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used as a portable new energy source in many electronic product fields due to their safety, long service life, and portability. At present, the key research direction of anode materials for lithium-ion batteries is developing towards lithium-type battery materials with high specific capacity, high rate, high cycle performance and high safety performance. [0003] Silicon has an ultra-high theoretical capacity (4200mAh / g) and a low delithiation potential (<0.5v), but the negative electrode material of silicon has serious reasons for volume expansion. In the process of completely intercalating lithium, the volume expansion rate It can reach 300%, which will not only affect the particle breakage of the sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525
CPCH01M4/364H01M4/386H01M4/48H01M10/0525Y02E60/10
Inventor 俞兆喆徐华蕊杨道国蔡苗朱归胜颜东亮
Owner 桂林麦克斯新能源科技有限公司
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