Silicon-carbon composite material, preparation method thereof and negative pole for lithium-ion battery

A technology of silicon-carbon composite materials and carbon materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost and high price, and achieve the effects of low production cost, low equipment requirements, and high yield

Inactive Publication Date: 2016-10-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when preparing such silicon-carbon composite materials, organosilicon such as silane is generally used as the silicon source, which is expensive, and carbonaceous materials are usually made of carbon nanotubes, carbon fibers and other materials, and the cost is relatively high

Method used

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  • Silicon-carbon composite material, preparation method thereof and negative pole for lithium-ion battery
  • Silicon-carbon composite material, preparation method thereof and negative pole for lithium-ion battery
  • Silicon-carbon composite material, preparation method thereof and negative pole for lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: Using wheat straw as raw material to prepare biomass source carbon material

[0074] 1) The wheat straw material was crushed, reacted with 4 mol / L hydrochloric acid at 150 degrees Celsius for 10 h, washed three times with deionized water and dried. Then carry out carbonization treatment at 600 degrees Celsius under the protection of an inert gas such as nitrogen, and then wash with 3mol / L hydrofluoric acid and stir for 1-6h. Finally, the wheat straw biomass source carbon material is obtained by washing and drying with deionized water.

[0075] 2) Carry out X-ray diffraction analysis with an X-ray powder diffractometer (Philips X'Pert Super diffract meter), figure 1 It is the X-ray diffraction spectrum of the powder obtained in this embodiment. It can be seen from the figure that there is no clear and sharp diffraction peak at 2θ in the range of 10-80 degrees in the X-ray diffraction spectrum, and a steamed bun peak appears between 20 and 30 degrees, which m...

Embodiment 2

[0077] Example 2: Using the biomass-sourced carbon material prepared from wheat straw in Example 1 as a substrate, a silicon-carbon composite material was prepared by vapor deposition.

[0078] 1) Put the prepared biomass-sourced carbon material into the reaction chamber. Commercially available acetylene (mixed gas of acetylene and argon, volume ratio Ar:C 2 h 2 = 9: 1) loaded silicon tetrachloride (the volume ratio of commercially available acetylene and silicon tetrachloride is 20: 1) passes in the reaction chamber, heats 550 degrees centigrade in the gas atmosphere containing acetylene and silicon tetrachloride, keeps After 8 hours, the silicon-carbon composite material was prepared after the reaction.

[0079] 2) image 3 It is the X-ray diffraction spectrum of the powder obtained in this embodiment. The spectrogram shows that the powder is an amorphous phase, and no other impurities are formed.

[0080] 3) Figure 4 It is an energy dispersive X-ray detection element...

Embodiment 3

[0081] Example 3: Applying the silicon-carbon composite material obtained in Example 2 to the performance research of lithium-ion battery anode materials

[0082] The products in the above-mentioned Example 2 are packed into CR2016 button cells (Shenzhen Pengxiang Yunda Machinery Technology Co., Ltd.), respectively, with the lithium sheet as the counter electrode, the polyolefin porous film (Celgard 2500) as the diaphragm, and the LiPF 6 A mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC) (volume ratio 1:1) was used as the electrolyte, and the CR2016 battery was completed in an argon atmosphere glove box. The silicon carbon electrode is made of 60% by weight of the biomass silicon carbon composite material in Example 2, 20% by weight of sodium carboxymethylcellulose adhesive, 20% of conductive carbon black, and water. The lining of the electrode film The bottom is metal copper foil. Conduct electrical performance tests at a test temperature of 25 degrees ...

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Abstract

The invention provides a preparation method of a silicon-carbon composite material. The method is characterized by comprising the steps: introducing a gas mixture consisting of silicon tetrachloride gas and reducing carrier gas into a reaction chamber, in which a carbon material is placed, wherein the reducing carrier gas contains reductive gas; heating the gas mixture, so as to enable the reductive gas to reduce the silicon tetrachloride gas into elemental silicon and form the silicon-carbon composite material, in which the elemental silicon is deposited on the carbon material. The method has the advantages that the raw materials are cheap, the process is simple, and the product performance is excellent. The invention further provides the silicon-carbon composite material and a silicon-carbon composite material containing negative pole for a lithium-ion battery.

Description

technical field [0001] The invention relates to the field of silicon-carbon composite materials, in particular to a method for preparing the silicon-carbon composite material, the silicon-carbon composite material prepared by the method, and a negative electrode for lithium ion batteries containing the silicon-carbon composite material. Background technique [0002] The improvement of electrode materials is one of the key points in the research and development of lithium-ion batteries. Silicon material has high theoretical capacity (~4200mAh / g) and low discharge potential (<0.5V, Vs.Li / Li + ), are considered to be important candidates to replace conventional graphite anodes. [0003] However, the silicon material has a large volume change (~300%) during charge and discharge, which not only is not conducive to the formation of a stable SEI film during battery cycling, but also leads to the pulverization of the electrode material, resulting in the battery exhibiting a rapi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/133H01M4/134H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 钱逸泰朱永春周建斌刘现玉
Owner UNIV OF SCI & TECH OF CHINA
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