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Method for synthesizing three-dimensional porous silicon powder from silane and application of three-dimensional porous silicon powder

A three-dimensional porous, silicon powder technology, used in structural parts, electrical components, battery electrodes, etc., to enhance rate performance, improve charge-discharge performance, and reduce absolute expansion.

Pending Publication Date: 2022-07-29
上海昱瓴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

However, the research and application of three-dimensional porous silicon powder prepared from silane is still in the early stage of exploration

Method used

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  • Method for synthesizing three-dimensional porous silicon powder from silane and application of three-dimensional porous silicon powder
  • Method for synthesizing three-dimensional porous silicon powder from silane and application of three-dimensional porous silicon powder
  • Method for synthesizing three-dimensional porous silicon powder from silane and application of three-dimensional porous silicon powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 The process of 0.01t of macroporous polystyrene microspheres with an average particle size D50 of 3 μm and a pore size of 0.1 μm was put into the fluidized bed reactor, and then argon was introduced into the fluidized bed reactor at the same time, and the flow rate was At 10 L / h, atmosphere replacement was performed. Then, monosilane and helium were simultaneously introduced into the fluidized bed reactor. The flow rates of monosilane and helium were both 10 L / h, and the reactor was heated to 400°C. After 3 hours of heat preservation, the inflow of monosilane and helium was stopped. Then, carbon dioxide was continuously introduced into the fluidized bed reactor with a flow rate of 10L / h, heated to 900°C, maintained for 1h, then stopped heating, and cooled to room temperature with the reactor to obtain three-dimensional through-holes with a pore diameter of 10-40nm. / Porous structure of three-dimensional porous silicon powder.

[0035]The obtained three-d...

Embodiment 2

[0037] see figure 1 The process of 0.1t of macroporous polystyrene microspheres with an average particle size D50 of 5μm and a pore size of 0.3μm and 0.1t of macroporous polyvinyl chloride microspheres with an average particle size of 6μm and a pore size of 0.2μm are mixed uniformly. Put it into a fluidized bed reactor, and then pass argon and helium into the fluidized bed reactor at the same time, with a flow rate of 200 L / h, to perform atmosphere replacement. Then, the mixed gas of disilane and monochlorosilane, argon and helium were simultaneously introduced into the fluidized bed reactor, wherein the gas volume ratio of disilane and monochlorosilane was 5:1, and the flow rate was 450 L / h. The flow rates of argon and helium were both 200L / h, heated to 500°C, and kept for 10h. Then stop feeding the mixed gas of disilane, monochlorosilane, argon and helium. Then, carbon dioxide was continuously introduced into the fluidized bed reactor with a flow rate of 450 L / h, heated to...

Embodiment 3

[0041] see figure 1 The process of 0.2t of macroporous polypropylene microspheres with an average particle size D50 of 7μm and a pore size of 0.3μm and 0.1t of macroporous polyvinyl chloride microspheres with an average particle size of 7μm and a pore size of 0.2μm are mixed evenly and placed into the CVD reactor, and then argon gas was introduced into the CVD reactor at a flow rate of 800 L / h, and the atmosphere was replaced. Then, the mixed gas of trisilane and dichlorosilane and argon were simultaneously introduced into the CVD reactor. The gas ratio of trisilane and dichlorosilane was 6:1, the flow rate was 1100L / h, and the flow rate of argon was 1200L / h. , heated to 700 ℃, after 8 hours of heat preservation, the mixed gas of trisilane, dichlorosilane and argon were stopped. Then, carbon dioxide was continuously introduced into the fluidized bed reactor with a flow rate of 1000 L / h, heated to 1000 °C, kept at a temperature of 2 h, then stopped heating, and cooled to room ...

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Abstract

The invention relates to a method for synthesizing three-dimensional porous silicon powder from silane and application of the three-dimensional porous silicon powder, and the preparation process comprises the following steps: adding macroporous polymer microspheres into a reactor, and introducing inert gas into the reactor to realize atmosphere replacement; silane and inert gas are introduced into the reactor at the same time, the reactor is heated to 400-900 DEG C, a constant-temperature reaction is conducted for 3-24 h, and introduction of the silane and the inert gas is stopped after the reaction is received; and after the reaction is finished, immediately introducing carbon dioxide into the reactor, heating the reactor to 900-1500 DEG C, carrying out constant-temperature reaction for 1-10 hours, then stopping heating, and cooling to room temperature along with the reactor to obtain the three-dimensional porous silicon powder. Compared with the prior art, the method has the advantages that the porous silicon powder with different pore / pore structures can be prepared according to requirements by selecting the macroporous polymer, the porous silicon powder is of a three-dimensional through pore / pore structure and is high in material structure stability, and carbon dioxide is used as a template remover; the product is carbon monoxide which can be recycled as fuel and is environment-friendly and clean.

Description

technical field [0001] The invention relates to the field of porous silicon preparation, in particular to a method for synthesizing three-dimensional porous silicon powder from silane and its application. Background technique [0002] Porous silicon is a new type of multifunctional porous material with pore sizes ranging from nanometers to millimeters. Due to its unique physical, chemical, optical and electrochemical properties, it is widely used in sensitive components and sensors, lighting materials, optoelectronic devices, biological analysis, immunodetection, Insulation materials, integrated circuits (SOI), solar cells, and lithium-ion batteries have a wide range of applications, and the market demand is very large, especially as the negative electrode material of lithium-ion batteries has attracted much attention in recent years. [0003] At present, the traditional graphite anode (theoretical specific capacity of 372mAh / g) has been difficult to meet the market demand f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 刘萍万文文王磊陈辉常凯铭王杰
Owner 上海昱瓴新能源科技有限公司
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