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Preparation method of silicon-carbon composite material

A technology of silicon-carbon composite materials and carbon-based materials, applied in nanotechnology for materials and surface science, active material electrodes, electrical components, etc., to achieve good consistency, avoid agglomeration and agglomeration, and uniform carbon layers

Pending Publication Date: 2020-12-25
利普同呈(江苏)新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing silicon-carbon composite materials to solve the problems of simple nano-silicon preparation or carbon coating, and to solve the problems of nano-silicon preparation, silicon and graphite composite, and carbon uniformity. Covering and other issues

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  • Preparation method of silicon-carbon composite material
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  • Preparation method of silicon-carbon composite material

Examples

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Embodiment 1

[0051] A method for preparing a silicon-carbon composite material, specifically comprising the following steps:

[0052] (1) Place porous artificial graphite in the chemical vapor deposition area of ​​the fluidized bed reactor, pass inert gas to replace the air in the reactor, and evacuate until the reactor pressure is 10Pa;

[0053] (2) Heat the material in the fluidized bed reactor to 500°C, feed silane gas, and conduct vapor deposition reaction for 1 hour, then feed argon gas to fluidize the porous artificial graphite, then close the argon gas, and evacuate to vacuum , the above steps are alternated periodically, repeated 5 times, and the precursor of the silicon-carbon composite material is obtained;

[0054] (3) Heat the material in the fluidized bed reactor to 800°C, pass carbon source gas to the precursor obtained in step (2) for chemical vapor deposition coating carbon, react for 2 hours, pass argon gas to the precursor Fluidized mixing, then turn off the argon gas, a...

Embodiment 2

[0056] A method for preparing a silicon-carbon composite material, specifically comprising the following steps:

[0057] (1) Place porous artificial graphite in the chemical vapor deposition area of ​​the fluidized bed reactor, pass inert gas to replace the air in the reactor, and evacuate until the reactor pressure is 10Pa;

[0058] (2) Heat the material in the fluidized bed reactor to 800°C, feed silane gas, and conduct vapor deposition reaction for 1 hour, then feed argon gas to fluidize the porous artificial graphite, then close the argon gas, and evacuate to vacuum , the above steps are alternated periodically, and repeated 3 times to obtain the precursor of the silicon-carbon composite material;

[0059] (3) Heat the material in the fluidized bed reactor to 1000°C, pass carbon source gas to the precursor obtained in step (2) for chemical vapor deposition coating carbon, react for 1 hour, pass argon gas to the precursor Fluidized mixing, then turn off the argon gas, and ...

Embodiment 3

[0061] A method for preparing a silicon-carbon composite material, specifically comprising the following steps:

[0062] (1) Place porous artificial graphite in the chemical vapor deposition area of ​​the fluidized bed reactor, pass inert gas to replace the air in the reactor, and evacuate until the reactor pressure is 10Pa;

[0063] (2) Heat the material in the fluidized bed reactor to 500°C, feed silane gas, and conduct vapor deposition reaction for 1 hour, then feed argon gas to fluidize the porous artificial graphite, then close the argon gas, and evacuate to vacuum , the above steps are alternated periodically, and repeated 3 times to obtain the precursor of the silicon-carbon composite material;

[0064] (3) The fluidized bed reactor was heated to 800°C, and argon gas was introduced to fluidize the precursor. During the fluidization process, acetylene gas was introduced to conduct vapor phase deposition of carbon, and the reaction was performed for 8 hours to obtain a si...

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Abstract

The invention relates to a preparation method of a silicon-carbon composite material, which comprises the following steps: adding a carbon-based material into a fluidized bed reactor, introducing inert gas to replace air in the fluidized bed reactor, and vacuumizing to form a vacuum environment in the fluidized bed reactor; introducing a silicon source gas into the fluidized bed reactor forming the vacuum environment, carrying out chemical vapor deposition to deposit nano silicon particles on the carbon-based material, and carrying out intermittent periodic repeated air extraction and air inflation deposition treatment to prepare a precursor of the silicon-carbon composite material; and introducing a carbon source gas into a fluidized bed reactor, and carrying out chemical vapor depositionto deposit carbon on the precursor, thereby obtaining the silicon-carbon composite material.

Description

technical field [0001] The invention relates to a method for preparing a silicon-carbon composite material. Background technique [0002] At present, the commercialization of lithium battery negative electrodes is mainly based on artificial / natural graphite, but it is close to its theoretical specific capacity limit (372mAh / g). The theoretical specific capacity of silicon is as high as 4200mAh / g, which is more than 10 times that of the current graphite-based anode materials. There is no hidden danger of lithium precipitation, and the safety is better than that of graphite-based anode materials. It has abundant reserves and low cost. It is the most potential next generation Lithium battery anode material. However, due to the alloying reaction of silicon materials with lithium during charging and discharging, there is a serious volume effect (the expansion rate can reach 300%). At the same time, due to the expansion effect, the SEI film on the surface of the negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 郑强勇王亮李春松崔云龙王峰于广发
Owner 利普同呈(江苏)新能源科技有限公司
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