Silicon-carbon composite material, preparation method thereof and cathode material containing same as well as lithium ion battery

A silicon-carbon composite material and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance of negative electrode materials, difficulty in uniform dispersion, poor effect, etc., to improve silicon volume effect , Improve electrochemical stability, improve specific capacity and cycle performance

Active Publication Date: 2014-07-30
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method directly uses nano-silicon powder as raw material, which is costly and ineffective, because nano-silicon powder is easy to agglomerate, and it is difficult to evenly disperse in the asphalt matrix, resulting in poor cycle performance of the prepared negative electrode material.

Method used

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  • Silicon-carbon composite material, preparation method thereof and cathode material containing same as well as lithium ion battery
  • Silicon-carbon composite material, preparation method thereof and cathode material containing same as well as lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 0.4g of phenolic resin and dissolve it in 30mL of ethanol to obtain a polymer phenolic resin solution, then add 0.80g of silicon monoxide, and ultrasonically disperse for 10min to fully disperse silicon monoxide in the polymeric phenolic resin solution. After stirring and evaporating ethanol, a viscous mixture is obtained, which is a composite material coated with silicon monoxide by polymer phenolic resin, which is transferred to a porcelain boat and heated to 1000°C, heat preservation for 4 hours, during which the phenolic resin undergoes a carbonization reaction, and the silicon monoxide undergoes a disproportionation reaction. After cooling, take it out to obtain 1.0 g of a composite material of porous carbon-coated silica / nano-silicon particles.

[0041] Add the obtained composite material into 50mL 3wt% hydrofluoric acid solution, and filter out the resulting suspension after stirring continuously for 10h. During the stirring process, the silicon dioxide in t...

Embodiment 2

[0046] Weigh 1g of polyvinyl chloride and dissolve it in 30mL of chloroform, then add 0.80g of silicon monoxide, and ultrasonically disperse for 60min. After stirring and evaporating chloroform, a viscous mixture was obtained, which was transferred to a porcelain boat, heated to 900°C under the protection of argon, kept for 12 hours, and taken out after cooling to obtain 1.1g of porous carbon-coated silica / nano Composite material of silicon particles.

[0047] The obtained composite material was added to 25mL of 8wt% hydrofluoric acid solution, and after continuous stirring for 6 hours, the resulting suspension was filtered out, washed thoroughly with distilled water, and dried at 100°C for 12 hours to obtain 0.6g of silicon-carbon composite material.

[0048] The particle size of nano-silicon particles in the silicon-carbon composite material was measured by the same method as in Example 1, and the nano-silicon content was 43%.

[0049] The obtained silicon-carbon composite ...

Embodiment 3

[0052] Weigh 3.2g of polymethyl methacrylate and dissolve in 30mL of acetone, then add 0.80g of silicon monoxide, and ultrasonically disperse for 100min. After stirring and evaporating acetone, a viscous mixture was obtained, which was transferred to a porcelain boat, heated to 1050°C under the protection of argon, kept for 4 hours, and taken out after cooling to obtain 1.5g of porous carbon-coated silica and nano-silicon particles of composite materials.

[0053] The obtained composite material was added to 20 mL of 20 wt% hydrofluoric acid solution, and the suspension was filtered out after continuous stirring for 1 h, washed thoroughly with distilled water, and dried at 100° C. for 12 hours to obtain 0.9 g of silicon-carbon composite material.

[0054] Using the same method as in Example 1, the particle size of nano-silicon particles in the silicon-carbon composite material was measured to be 34 nm, and the nano-silicon content was 31%.

[0055] The obtained silicon-carbon...

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Abstract

The invention provides a silicon-carbon composite material, a preparation method thereof and a battery cathode made of the silicon-carbon composite material as well as a lithium ion battery. The silicon-carbon composite material comprises hollow porous carbon ball-enwrapped nanometer silicon particles; each nanometer silicon particle in the silicon-carbon composite material has a particle size of 5-80 nm, wherein the content of nanometer silicon is 10-90 wt percent. The silicon-carbon composite material has simple manufacturing process and can effectively restrain the expansion of silicon volume, so that the prepared lithium ion cathode material has excellent conductivity, and the corresponding lithium ion battery has large specific capacity and good cycling performance.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a silicon-carbon composite material and a preparation method thereof, and a lithium-ion battery negative electrode material and a lithium-ion battery containing the silicon-carbon composite material. Background technique [0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent properties such as good performance, environmental friendliness, structural diversity and low price have been widely used. As far as the structure of lithium ion battery is concerned, it is mainly composed of positive electrode, negative electrode, separator and electrolyte, and whether the electrode performance of negative electrode material can be further improved becomes the decisive factor restri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 曾绍忠朱广燕
Owner CHERY AUTOMOBILE CO LTD
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