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Preparation method of high-performance carbon-silicon composite hollow nano-sphere negative material

A silicon-carbon composite and anode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex process, high cost, unfavorable industrial production, etc., and achieve simple process and easy operation Convenient and beneficial to industrial production

Inactive Publication Date: 2018-09-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for preparing silicon-carbon composite nanomaterials mainly include chemical vapor deposition, thermal vapor deposition, pyrolysis, etc. These preparation processes are complex and costly, which is not conducive to large-scale industrial production.

Method used

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  • Preparation method of high-performance carbon-silicon composite hollow nano-sphere negative material
  • Preparation method of high-performance carbon-silicon composite hollow nano-sphere negative material
  • Preparation method of high-performance carbon-silicon composite hollow nano-sphere negative material

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Experimental program
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Effect test

Embodiment 1

[0022] (1) Dissolve 1 g of phenol in a mixed solvent of water and methanol at a certain volume ratio, stir magnetically for 30 minutes to form a clear solution, add 2.5 mL of ethylenediamine, and continue stirring for 30 minutes.

[0023] (2) in the solution of step (1), add 4g tetradecyltrimethyl ammonium chloride, after stirring for a certain hour to make it fully dissolve, add the acetaldehyde of 1.8mL and the methyl orthosilicate of 15mL in order, Stir for 10 hours.

[0024] (3) Transfer the solution obtained in step (2) to a three-necked flask, and use a microwave heater to treat it at 80°C for 40 minutes. After the reaction is completed, cool to room temperature, centrifuge, wash and dry to obtain a composite of phenolic resin and silicon oxide .

[0025] (4) Put the composite obtained in step (3) into a high-temperature tube furnace, heat-treat at 500° C. for 5 hours under a nitrogen atmosphere, and naturally cool to room temperature to obtain a composite product of si...

Embodiment 2

[0029] (1) Dissolve 3g of p-aminophenol in a mixed solvent of water and isopropanol at a certain volume ratio, and stir magnetically for 30 minutes to form a clear solution, then add 5mL of ammonia water and continue stirring for 30 minutes.

[0030] (2) Add 8g tetradecyltrimethylammonium bromide to the solution of step (1), after stirring for a certain period of time to make it fully dissolve, add 6mL of propionaldehyde and 20mL of propyl orthosilicate in order, stir 24 hours.

[0031] (3) Transfer the solution obtained in step (2) to a three-necked flask, and use a microwave heater to treat it at 120°C for 30 minutes. After the reaction is completed, cool to room temperature, centrifuge, wash and dry to obtain a composite of phenolic resin and silicon oxide .

[0032] (4) Put the composite obtained in step (3) into a high-temperature tube furnace, heat-treat at 700° C. for 10 hours under a nitrogen atmosphere, and naturally cool to room temperature to obtain a composite pro...

Embodiment 3

[0035] (1) Dissolve 3.5g of catechol in a mixed solvent of water and methanol at a certain volume ratio, and magnetically stir for 30 minutes to form a clear solution, then add 6.5mL of ethylenediamine and continue stirring for 30 minutes.

[0036] (2) Add 5g tetradecyl trimethyl ammonium chloride in the solution of step (1), after stirring for a certain period of time to make it fully dissolve, add the formaldehyde of 7mL and the methyl orthosilicate of 30mL in order, stir 24 Hour.

[0037] (3) Transfer the solution obtained in step (2) to a three-necked flask, and use a microwave heater to treat it at 100°C for 25 minutes. After the reaction is completed, cool to room temperature, centrifuge, wash and dry to obtain a composite of phenolic resin and silicon oxide .

[0038] (4) Put the composite obtained in step (3) into a high-temperature tube furnace, heat-treat at 800° C. for 12 hours under a nitrogen atmosphere, and cool naturally to room temperature to obtain a composit...

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Abstract

The invention discloses a preparation method of a high-performance carbon-silicon composite hollow nano-sphere negative material. The method comprises the following steps: taking phenols, aldehydes and orthosilicate organic substances as raw material, preparing through a microwave method to obtain phenolic resin and silicon dioxide composite under the effect of the alkali catalyst and the surfactant; and then obtaining the silicon-carbon composite hollow nano-sphere through high-temperature carbonization and thermal reduction treatment. The preparation method disclosed by the invention is simple in process, convenient for operation, easy in raw material obtaining, low in cost and in favor of industrial production, the prepared material size and morphology are uniform, and the rich mesoporous structure is provided, the ion transmission distance is shortened, the ion diffusion rate of the material is improved, and the conductivity of the material is improved, so that the material has stable cycling and rate performance, and the preparation method has potential application prospect on the negative electrode aspect of the lithium ion battery.

Description

technical field [0001] The invention specifically relates to a method for preparing a high-performance silicon-carbon composite nano hollow sphere negative electrode material, which belongs to the technical field of preparation of new energy materials. Background technique [0002] Long-life, high-energy-density lithium-ion batteries are becoming more and more important in technologies such as portable electronic devices, electric vehicles, and renewable energy storage systems. The current commercial lithium-ion battery negative electrode is mainly graphite, but its theoretical specific capacity is only 372mAh g -1 , silicon can react with lithium to form Li 22 Si 5 get 4200mAh g -1 The theoretical specific capacity is more than 10 times higher than that of commercial graphite anodes, thus becoming the most promising anode material for next-generation lithium-ion batteries. However, the huge volume change during the charge-discharge cycle of the silicon anode makes the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 曹传宝马晨丹陈松
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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