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Preparation method and application of carbon coated carbon nitride/silicon-silicon nitride/silicon dioxide composite material

A technology of carbon-coated carbon nitride and silicon dioxide, which is applied in the field of nanomaterials to achieve the effects of less impurity content, high capacity retention rate, and low equipment requirements

Active Publication Date: 2014-12-24
李宏斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The method of using carbon-coated carbon nitride / silicon-silicon nitride / silicon dioxide high-capacity nanocomposite as a negative electrode material for secondary batteries has not been reported yet

Method used

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  • Preparation method and application of carbon coated carbon nitride/silicon-silicon nitride/silicon dioxide composite material
  • Preparation method and application of carbon coated carbon nitride/silicon-silicon nitride/silicon dioxide composite material
  • Preparation method and application of carbon coated carbon nitride/silicon-silicon nitride/silicon dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 10 grams of SiO and 10 grams of artificial graphite FSN-4 were added to 20 milliliters of ethanol, and ball milled with agate balls at 400 rpm for 21 hours in a QM-2SP12 ball mill in Nanjing University Instrument Factory. Then take out and dry the grinding balls in a self-made glove box under argon protection, add a mixed solution of 10 grams of furfuryl alcohol, 25 grams of absolute ethanol, and 0.75 grams of water, and stir evenly. Add a mixed solution of 0.7 gram of water and 0.3 gram of hydrochloric acid, stir evenly, and let it stand for 12 hours, so that the furfuryl alcohol is fully polymerized.

[0066] The mixture after the polymerization reaction was transferred to an alumina crucible, placed in a high-temperature atmosphere electric furnace of Shanghai Jiugong Electric Co., Ltd., vacuumed, and 99.9% argon protective gas was passed, and then the temperature was raised to 1000°C at a rate of 5°C / min, and Keeping at this temperature for 3 hours, silicon oxide un...

Embodiment 2

[0068] Embodiment 2 Ionic liquid C 10 h 15 N 5

[0069] The preparation method of the carbon-coated silicon / silicon dioxide nanocomposite is the same as in Example 1.

[0070] Weigh 3 grams of carbon-coated silicon / silica nanocomposites and 1.5 grams of colorless ionic liquid 1-butyl-3-methylimidazole dinitrile amine salt (C 10 h 15 N 5 ), grind it evenly in an agate mortar, put it into an alumina crucible, put it into a high-temperature atmosphere electric furnace of Shanghai Jiugong Electric Co., Ltd., evacuate, pass 99.9% argon protective gas, and then heat up to 750°C, and kept at this temperature for 1 hour, after natural cooling, stop feeding argon.

[0071] The calcined product is brown-black carbon-coated carbon nitride / silicon-silicon nitride / silicon dioxide nanocomposite powder solid.

example 3

[0072] Example 3 Ionic Liquid C 11 h 14 N 4

[0073] The preparation method of the carbon-coated silicon / silicon dioxide nanocomposite is the same as in Example 1.

[0074] Weigh 3 grams of carbon-coated silicon / silica nanocomposites and 1.52 grams of brown liquid ionic liquid 1-butylpyridine dinitrile amine salt (C 11 h 14 N 4 ). The nitriding reaction environment and conditions are the same as in Example 2.

[0075] The calcined product is brown-black carbon-coated carbon nitride / silicon-silicon nitride / silicon dioxide nanocomposite powder solid.

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Abstract

The invention discloses a preparation method and application of a carbon coated carbon nitride / silicon-silicon nitride / silicon dioxide composite material. The preparation method comprises the steps of firstly preparing a carbon coated silicon / silicon dioxide nano-composite material, and then preparing the carbon coated carbon nitride / silicon-silicon nitride / silicon dioxide composite material. The nano-composite material is of a carbon coated structure containing pyrolytic carbon and carbon nitride. Silicon and silicon nitride particles are compounded on the surfaces of silicon dioxide particles. A carbon coated layer is located on the silicon-silicon nitride / silicon dioxide nano-composite material. The carbon coated carbon nitride / silicon-silicon nitride / silicon dioxide composite material prepared by means of the method has the advantages of being high in specific capacity and cycle performance and is suitable for lithium-ion secondary cell application and industrial production.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a preparation method of carbon-coated carbon nitride / silicon-silicon nitride / silicon dioxide high-nano composite material and its application in negative electrode materials of secondary batteries. Background technique [0002] The increase in fuel consumption of petroleum resources and the environmental pollution caused by fuel consumption, as well as the development of smart electronic devices, new energy vehicles and energy storage products, require higher and higher capacity and cycle performance of secondary batteries. [0003] At present, the anode materials of high-capacity secondary batteries are mainly based on silicon and other alloys. Among them, silicon has a relatively high specific capacity of 4200mAh / g in theory, but when silicon is used as the negative electrode material of lithium-ion secondary batteries, the volume expansion of the silicon crystal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/483H01M4/58H01M4/625H01M10/0525Y02E60/10
Inventor 李宏斌
Owner 李宏斌
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