Preparation method of graphene-coated silicon particle composite material

A graphene-wrapped, composite material technology, applied in nanotechnology, electrical components, electrochemical generators and other directions for materials and surface science, can solve problems such as agglomeration of silicon nanoparticles, inability to large-scale production, and achieve a simple process , excellent stability, the effect of avoiding agglomeration

Inactive Publication Date: 2018-01-19
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for preparing a graphene-wrapped silicon particle composite material that can solve the problem that silicon nanoparticles agglomerate on the surface of graphene and cannot be mass-produced during the preparation process of the silicon / graphene composite material

Method used

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  • Preparation method of graphene-coated silicon particle composite material
  • Preparation method of graphene-coated silicon particle composite material
  • Preparation method of graphene-coated silicon particle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Firstly, silicon nanoparticles and graphite powder are pressed into hybrid carbon / silicon rods at a ratio of 1:1. Put this mixed graphite rod in the electric arc equipment, at the current of 130A, the distance between the cathode rod and the anode rod is 2mm, and fill it with 100K Pa of H 2 and He 2 , the volume ratio is 1:1, the discharge time under this condition is 10min, the discharge is over, and the products in the arc equipment are collected. The obtained silicon / graphene composite material was emulsified for 2 minutes, ultrasonicated for 20 minutes, and freeze-dried for 6 hours to obtain the final product.

[0044] Using Raman and scanning electron microscopy to characterize the physical and chemical properties of the prepared silicon / graphene composite material, the results are shown in figure 1 , figure 2 , the electrochemical performance test was carried out on the prepared silicon / graphene composite assembled battery, the results are shown in image 3 w...

Embodiment 2

[0048] Firstly, silicon carbide nanoparticles and graphite powder were pressed into hybrid carbon / silicon rods at a ratio of 1:2. Put this mixed graphite rod in the electric arc equipment, at the current of 120A, the distance between the cathode rod and the anode rod is 2mm, and fill it with 100K Pa of H 2 and He 2 , the volume ratio is 1:2, the discharge time is 8min under the condition, the discharge is completed, and the products in the arc equipment are collected. The obtained silicon / graphene composite material was emulsified for 5 minutes, ultrasonicated for 30 minutes, and freeze-dried for 3 hours to obtain the final product.

[0049] The electrochemical performance test shows that the current density is 50, 100, 200, 500mA g -1 Under the charge and discharge rate, their average discharge capacity can still be maintained at 1225, 1146, 984, 690mAh g -1 , when the current density from 500mA g -1 back to 50mA g -1 , the average discharge capacity also reached 1117mA ...

Embodiment 3

[0051] First, silicon oxide powder and activated carbon powder are pressed into a mixed carbon / silicon rod in a ratio of 2:1. Put this mixed graphite rod in the electric arc equipment, at the current of 100A, the distance between the cathode rod and the anode rod is 1mm, and fill it with 100K Pa of H 2 and He 2 , the volume ratio is 1:3, the discharge time is 15min under this condition, the discharge is over, and the products in the arc equipment are collected. The obtained silicon / graphene composite material was emulsified for 6 minutes, ultrasonicated for 40 minutes, and freeze-dried for 6 hours to obtain the final product.

[0052] The electrochemical performance test shows that the current density is 50, 100, 200, 500mA g -1 Under the charge and discharge rate, their average discharge capacity can still be maintained at 2035, 1956, 1594, 980mAh g -1 , when the current density from 500mA g -1 back to 50mA g -1 , the average discharge capacity also reached 1677mA g -1 ...

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Abstract

The invention provides a preparation method of a graphene-coated silicon particle composite material. The preparation method comprises the steps of 1, performing uniform mixing on carbon powder and asilicon-containing material and then performing pressing to prepare a carbon/silicon rod; 2, putting the carbon/silicon rod into electric arc equipment to be used as a negative electrode, inflating with H<2> and He<2>, adjusting the distance between the carbon/silicon rod and a positive electrode rod, and controlling current and performing arc discharge to prepare a product A; and 3, performing emulsification, ultrasonic processing, freezing and drying on the product A to obtain the graphene-coated silicon particle composite material. By taking the carbon powder and the silicon-containing material as the raw materials and by adopting the arc discharge method as the preparation means, silicon particles are intercalated between graphene layers so as to obtain the composite material; comparedwith the conventional method, the method disclosed in the invention is simple and convenient in process and low in cost; the material is uniform in appearance and stable in structure, so that the problems of silicon particle agglomeration and expansion can be solved; and compared with the similar silicon/graphene composite material, the graphene-coated silicon particle composite material shows higher electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a graphene-silicon particle composite material, in particular to a preparation method of a graphene-wrapped silicon particle composite material. Background technique [0002] Studies have shown that graphene can be used as an anode material for lithium-ion batteries, but its relatively low theoretical lithium storage capacity (372mA h g -1 ) greatly limits its application. In order to solve this problem, the current common method is to use a material with a higher lithium storage capacity to compound it, that is, to prepare a composite material. Among all the elements alloyed for lithium storage, silicon has the highest specific capacity (about 10 times the actual specific capacity of graphene), which has a lower discharge voltage and causes the possibility of surface lithium precipitation at low temperature or fast charging Smaller, it is an ideal high-storage lithium material. However, single silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 曹殿学栾玉婷程魁叶克王贵领
Owner HARBIN ENG UNIV
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