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Amorphous carbon-silicon-carbon nanofiber-graphite composite material as well as preparation method and application thereof

A carbon nanofiber, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of avoiding residue, avoiding repeated formation and destruction, and high specific surface area

Active Publication Date: 2021-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the existing chemical vapor deposition technology that uses metal catalysts to catalyze silicon deposition, there are many problems caused by the existence of trace metals. The first purpose of the present invention is to provide a metal-catalyzed vapor-phase deposition of carbon nanofibers, and then remove metals at high temperature. , and then use carbon nanofibers to catalyze chemical vapor deposition of silicon, and finally chemical vapor deposition of amorphous carbon to obtain amorphous carbon-silicon-carbon nanofiber-graphite composite materials, which removes metal at high temperature before chemical vapor deposition of silicon Catalyst, using carbon nanofibers to catalyze chemical vapor deposition of silicon, avoiding the residue of metal catalysts in composite materials, and improving the electrochemical performance of composite materials

Method used

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  • Amorphous carbon-silicon-carbon nanofiber-graphite composite material as well as preparation method and application thereof
  • Amorphous carbon-silicon-carbon nanofiber-graphite composite material as well as preparation method and application thereof
  • Amorphous carbon-silicon-carbon nanofiber-graphite composite material as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0032]1. Weigh 50g of graphite powder and 2g of ferric chloride and mix them in an aqueous solution, dry them in a blast drying oven at 80°C for 12 hours, grind them, and sieve them through a 200-mesh sieve. Take the above sample and place it in a chemical vapor deposition furnace, use methane as the carbon source, deposit it under the condition of 800 degrees Celsius and normal pressure for 0.5h, and then place it in a high-temperature furnace for 0.5h at 1500 degrees Celsius to remove trace elements to prepare carbon nanofiber-natural stone Ink Composite.

[0033] 2. Take 5g of sample 1 and put it into a specific tooling and place it in a chemical vapor deposition furnace. Use dichlorodimethylsilane as the silicon source and argon as the carrier gas. Deposit at 900 degrees Celsius for 2 hours. The deposited sample is ground and then removed. Washing with deionized water three times, suction filtration and drying, the silicon-carbon nanofiber-natural graphite composite materi...

Embodiment 2

[0040] 1. Weigh 50g of graphite powder and 2g of nickel nitrate, mix them in an aqueous solution, dry them in a blast drying oven at 80°C for 12h, grind them, and sieve them through a 200-mesh sieve. Take the above sample and place it in a chemical vapor deposition furnace, use propylene as the carbon source, deposit it at 900 degrees Celsius under normal pressure for 0.5 hours, and then place it in a high-temperature furnace for 0.5 hours at 1500 degrees Celsius to remove trace elements to prepare carbon nanofiber-natural stone Ink Composite.

[0041] 2. Take 5g of sample 1 and place it in a specific tooling and place it in a chemical vapor deposition furnace. Use dichlorodimethylsilane as the silicon source and argon as the carrier gas. Deposit at 900 degrees Celsius for 1 hour. The deposited sample is ground and then removed. Washing with deionized water three times, suction filtration and drying, the silicon-carbon nanofiber-natural graphite composite material was prepared...

Embodiment 3

[0045] 1. Weigh 50g of graphite powder and 2g of cobalt nitrate, mix them in an aqueous solution, dry them in a blast drying oven at 80 degrees Celsius for 12 hours, grind them, and sieve them through a 200-mesh sieve. Take the above sample and place it in a chemical vapor deposition furnace, use propylene as the carbon source, deposit it at 800 degrees Celsius and normal pressure for 0.5 hours, and then place it in a high-temperature furnace for 0.5 hours at 1500 degrees Celsius to remove trace elements to prepare carbon nanofiber-natural stone Ink composite negative electrode wiping material.

[0046] 2. Take 5g of sample 1 and put it into a specific tooling and place it in a chemical vapor deposition furnace. Use dichlorodimethylsilane as the silicon source and argon as the carrier gas. Deposit at 900 degrees Celsius for 2 hours. The deposited sample is ground and then removed. Washing with deionized water three times, suction filtering and drying, the silicon-carbon nanofi...

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Abstract

The invention discloses an amorphous carbon-silicon-carbon nanofiber graphite composite material as well as a preparation method and application thereof. The method comprises the following steps of onthe surface of graphene, generating carbon nanofibers by utilizing metal catalytic chemical vapor deposition, removing a metal catalyst, then utilizing the carbon nanofibers to catalyze the chemicalvapor deposition of silicon, and finally depositing amorphous carbon to obtain the amorphous carbon-silicon-carbon nanofiber graphite composite material. According to the method, residues of a metal catalyst and the like in the composite material can be avoided, the prepared silicon-carbon composite material is high in electrochemical activity and good in stability, the safety performance of a battery can be improved, and the service life of the battery can be prolonged.

Description

technical field [0001] The invention relates to a silicon-carbon composite negative electrode material, in particular to an amorphous carbon-silicon-carbon nanofiber-graphite composite material, and to a method for preparing an amorphous carbon-silicon-carbon nanofiber-graphite composite material by vapor deposition , and the application of amorphous carbon-silicon-carbon nanofiber-graphite composite material in lithium-ion battery negative electrode materials, belonging to the technical field of lithium-ion battery negative electrode material preparation. Background technique [0002] As the most promising anode material for high-capacity lithium-ion batteries, silicon has the advantages of a theoretical lithium storage capacity of 4200mAh / g, low possibility of lithium precipitation during charging and discharging, and high safety performance. However, the conductivity of silicon is poor, and the volume change rate is about 400% in the process of lithium intercalation and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/386H01M4/628H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 谢志勇刘备黄鹏
Owner CENT SOUTH UNIV
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