Silicon-carbon composite material with high specific capacity, preparation method of silicon-carbon composite material, lithium ion battery anode material and lithium ion battery

A technology of silicon-carbon composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as slow attenuation, achieve simple preparation process, simple process steps, Energy Saving Effect

Active Publication Date: 2012-06-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People such as Wu Jishan (Hongfa Xiang, Kai Zhang, Ge Ji, Jim Yang Lee, Changji Zou, Xiaodong Chen, Jishan Wu, CARBON 49 (2011) 1787 1796) have reported that graphene directly mixes synthetic composit

Method used

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  • Silicon-carbon composite material with high specific capacity, preparation method of silicon-carbon composite material, lithium ion battery anode material and lithium ion battery
  • Silicon-carbon composite material with high specific capacity, preparation method of silicon-carbon composite material, lithium ion battery anode material and lithium ion battery
  • Silicon-carbon composite material with high specific capacity, preparation method of silicon-carbon composite material, lithium ion battery anode material and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 8.8g of silicon monoxide and put it into a porcelain boat, raise the temperature to 800°C under the protection of nitrogen, keep the temperature at this temperature for 24 hours, make the disproportionation reaction of silicon monoxide at high temperature, and generate silicon dioxide-coated nano-silicon granular structure. After cooling to room temperature, 8.8 g of a tan product was obtained. The tan product includes incompletely reacted silicon monoxide, product silicon dioxide and nano-silicon, wherein the nano-silicon particles are uniformly dispersed in the silicon dioxide matrix.

[0035] Add the obtained tan product to 25ml of 40wt% hydrofluoric acid solution, add 3g of acetylene black at the same time, stir for 1 hour, and then ultrasonically disperse for 380 minutes. Hydrofluoric acid does not react, the silicon dioxide on the surface of nano-silicon particles reacts, and the incompletely reacted silicon monoxide in the previous high-temperature disprop...

Embodiment 2

[0041] Weigh 8.8g of silicon monoxide and put it into a porcelain boat, raise the temperature to 900°C under the protection of nitrogen, and keep the temperature at this temperature for 12 hours, so that the disproportionation reaction of silicon monoxide will occur at high temperature to form nano-silicon coated with silicon dioxide. granular structure. After cooling to room temperature, 8.8 g of a tan product was obtained. The tan product includes incompletely reacted silicon monoxide, product silicon dioxide and nano-silicon, wherein the nano-silicon particles are uniformly dispersed in the silicon dioxide matrix.

[0042] Add the obtained tan product to 200ml of hydrofluoric acid solution with a concentration of 20wt%, and add 1.5g of expanded graphite at the same time, stir for 2 hours, and then ultrasonically disperse for 180 minutes. It does not react with hydrofluoric acid, the silicon dioxide on the surface of nano-silicon particles reacts, and the incompletely react...

Embodiment 3

[0046] Weigh 8.8g of silicon monoxide and put it into a porcelain boat, raise the temperature to 1000°C under the protection of argon, keep the temperature at this temperature for 10h, make the disproportionation reaction of silicon monoxide at high temperature, and generate silicon dioxide-coated nano Silicon particle structure. After cooling to room temperature, 8.8 g of a tan product was obtained. The tan product includes incompletely reacted silicon monoxide, product silicon dioxide and nano-silicon, wherein the nano-silicon particles are uniformly dispersed in the silicon dioxide matrix.

[0047] Add the obtained tan product to 120ml of hydrofluoric acid solution with a concentration of 20wt%, and add 5g of vapor-phase grown carbon fiber at the same time, stir for 2 hours, and then ultrasonically disperse for 30 minutes. It does not react with hydrofluoric acid, the silicon dioxide on the surface of nano-silicon particles reacts, and the incompletely reacted silicon mono...

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Abstract

The invention discloses a silicon-carbon composite material for a lithium ion battery, a preparation method of the silicon-carbon composite material, and a lithium ion battery anode material and the lithium ion battery, which are prepared from the silicon-carbon composite material. The silicon-carbon composite material comprises a porous carbon matrix material with pores and nano silicon particles composited among the pores of the porous carbon matrix material. The particle diameter of each nano silicon particle in the silicon-carbon composite material is 5-100 nm, wherein the content of nano silicon is 10-90 wt%. The silicon-carbon composite material has a simple manufacturing process and is capable of obviously reducing a volume effect of a silicon-containing active substance in the process of being intercalated and de-intercalated with lithium, improving a diffusion behaviour of lithium in an active material and increasing the specific capacity of the lithium ion battery. The battery anode material prepared from the composite material has a good conductivity property. The prepared lithium ion battery has a good cycling property.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a high-specific-capacity 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] At present, the negative electrodes of commercial lithium-ion batteries use graphitized carbon, such as mesocarbon microspheres MCMB and CMS materials. The volume expansion of these materials is basically below 9% during the lithium intercalation and desorption process, showing high Coulombic efficiency and excellent performance. Cycle stability. However, the theoretical lithium intercalation capacity of graphite is 372mAh / g, which has actually reached 370mAh / g. Therefore, the low theoretical lithium storage capacity of the graphite electrode itself makes it difficult to make breakthroughs. Researchers hav...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 曾绍忠
Owner CHERY AUTOMOBILE CO LTD
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