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Silicon/charcoal core-shell structure nanometer composite material and its preparation method and uses

A nano-composite material, core-shell structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as unsatisfactory long-term cycle performance and loss of nanoparticles, and achieve stable product quality, uniform particle size, and dispersibility. good effect

Inactive Publication Date: 2006-07-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because nanoparticles are prone to agglomeration, the unique effect of nanoparticles is gradually lost, and the long-term cycle performance is still not ideal.

Method used

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  • Silicon/charcoal core-shell structure nanometer composite material and its preparation method and uses
  • Silicon/charcoal core-shell structure nanometer composite material and its preparation method and uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 0.5g of nano-silicon and 0.5g of polyvinylpyrrolidone into 200ml of water, and continuously ultrasonically disperse for 30 minutes to make the nano-silicon disperse evenly. Then add 1 g of sodium lauryl sulfate, and continue ultrasonic emulsification for 30 minutes. Then add 0.5 g of acrylonitrile (AN) and 0.005 g of potassium persulfate, and evacuate with an inert gas for 30 minutes under magnetic stirring. Stirring was continued, and the temperature of the oil bath was raised to 70° C. for emulsion polymerization under an inert atmosphere for 12 hours. After the emulsion polymerization is completed, the mixed liquid is centrifuged, and the product is dried at a temperature of 60° C. to obtain a brown micropowder, which is the nano-silicon / polyacrylonitrile precursor. The brown fine powder was calcined at 700° C. for 24 hours under the protection of an inert atmosphere to obtain a black silicon / carbon core-shell nanocomposite material.

[0032] The electrochemica...

Embodiment 2

[0034] Add 0.5g of nano-silicon and 0.5g of polyvinylpyrrolidone (polyvinylpyrrolidone) into 200ml of water, and continuously ultrasonically disperse for 30 minutes to make the nano-silicon disperse evenly. Then add 1gOP 9 , continuous phacoemulsification for 30 minutes. Then add 1 g of acrylonitrile (AN) and 0.005 g of potassium persulfate, and evacuate with an inert gas for 1 hour under magnetic stirring. Stirring was continued, and the temperature of the oil bath was raised to 70° C. for emulsion polymerization under an inert atmosphere for 12 hours. After the emulsion polymerization is completed, the mixed liquid is centrifuged, and the product is dried at a temperature of 60° C. to obtain a brown micropowder, which is the nano-silicon / polyacrylonitrile precursor. The brown micropowder was calcined at 750° C. for 24 hours under the protection of an inert atmosphere to obtain a black silicon / carbon core-shell nanocomposite material. The transmission electron microscope a...

Embodiment 3

[0036] Add 0.5g of nano-silicon and 0.5g of polyvinylpyrrolidone into 200ml of water, and continuously ultrasonically disperse for 30 minutes to make the nano-silicon disperse evenly. Then add 1 g of sodium dodecylsulfonate and continue ultrasonic emulsification for 1 hour. Then, 1.5 g of styrene and 0.01 g of azobisisobutyronitrile (AIBN) were added, and the mixture was evacuated with an inert gas for 2 hours under magnetic stirring. Stirring was continued, and the temperature of the oil bath was raised to 70° C. for emulsion polymerization under an inert atmosphere for 8 hours. After the emulsion polymerization is completed, the mixed liquid is centrifuged, and the product is dried at a temperature of 60° C. to obtain a brown micropowder, which is the nano-silicon / polystyrene precursor. The brown micropowder was calcined at 800° C. for 16 hours under the protection of an inert atmosphere to obtain a black silicon / carbon core-shell nanocomposite material. The electrochemica...

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Abstract

The invention relates to a method of preparing si / c nuclear shell structure nano composite material by emulsion polymerization and the material thereof. The construction of si / c nuclear shell structure nano composite material produced in said invention is stable with diameter of particles several hundred nanometers or less. During the process of lithium ion in-built and out-built, the shell material of hard construction could avoid the agglomeration of nano-crystals, making lithium ion battery have good reversible capacitance and circulatory function. Besides, the invention is characterized by: good operability, repeatability, stable quality of production thereof.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a silicon / carbon core-shell nanocomposite material and its preparation method and application. Method for cracking carbon-shell nanocomposites. The present invention also relates to the use of the silicon / carbon core-shell nanocomposite material obtained by the above method, that is, as a lithium ion battery negative electrode material. Background technique [0002] As we all know, silicon, as a promising anode material for lithium-ion batteries, has attracted more and more attention in the industry. The main reason is that the cut-off potential of lithium insertion into silicon can not only be controlled above 0.2V, but also the reversible insertion of lithium into silicon Large, the theoretical insertion capacity reaches 4000mAh / g, which can significantly improve the capacity and safety performance of the battery. However, during the insertion and deintercal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/524C04B35/628H01M4/58H01M4/38
CPCY02E60/10
Inventor 张涛付丽君吴宇平吴浩青
Owner FUDAN UNIV
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