Silicon-carbon composite material in bubble coral form, manufacturing method and application thereof

A silicon-carbon composite material, coral technology, applied in electrical components, active material electrodes, electrochemical generators, etc., can solve the problems of material structure collapse after reduction, poor battery stability, porous structure damage, etc., and achieve porous silicon alloying. Easy process, improved performance, uniform distribution of hollow gaps

Inactive Publication Date: 2020-02-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the method of using magnesium powder to reduce diatomite as the negative electrode material of lithium-ion batteries, there are disadvantages such as the collapse of the material structure after reduction; the destruction of the porous structure due to high temperature; and the poor stability of the battery.

Method used

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  • Silicon-carbon composite material in bubble coral form, manufacturing method and application thereof
  • Silicon-carbon composite material in bubble coral form, manufacturing method and application thereof
  • Silicon-carbon composite material in bubble coral form, manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Preparation of P-Si: Add 0.6003g of diatomite powder, 0.4803g of metal magnesium powder and 12.0421g of sodium chloride powder into a ball mill and ball mill at a speed of 180r / min for 10h, then put the resulting mixture into a tube In the furnace, argon was introduced as a protective atmosphere, and the temperature was raised to 650°C at a rate of 2°C / min for 3 hours, and then cooled to room temperature naturally, and the product was placed in 0.1mol / L hydrochloric acid solution 65ml, stirred and washed for 12 hours, and then centrifuged (The centrifugal rate is 11000r / min, the same below), according to this method, cycle washing and centrifugation for 3 times, dry, then put into 30ml of 5% HF aqueous solution, stir for 300min, wash and centrifuge for 3 times, and finally, the product is vacuum-dried for 6h, namely Get P-Si. see results figure 2 , is the X-ray diffraction pattern of the obtained P-Si.

[0056] (2)P-Si@SiO 2 Preparation: 136.6 mg of P-Si was dis...

Embodiment 2

[0062] (1) Preparation of P-Si: Add 0.5001g of diatomite powder, 0.6212g of metal magnesium powder and 5.001g of sodium chloride powder into a ball mill and ball mill at a speed of 250r / min for 5h, then put the resulting mixture into a tube furnace In, argon was introduced as a protective atmosphere, and the temperature was raised to 500°C at a rate of 1°C / min for 5 hours, and then cooled to room temperature naturally. Speed ​​is 11000r / min, the same below), according to this method, cycle washing and centrifugation for 3 times, dry, then put into 30ml of 8% HF aqueous solution, stir for 100min, wash and centrifuge for 3 times, and finally, the product is vacuum-dried for 12h to obtain P -Si.

[0063] (2)P-Si@SiO 2 Preparation: the same as in Example 1 to obtain P-Si@SiO2.

[0064] (3)P-Si@SiO 2 Preparation of @C: the P-Si@SiO 2 74mg was dispersed in 500ml deionized water, then mixed with 0.74ml CTAB aqueous solution and 74ul concentrated ammonia water, stirred vigorously...

Embodiment 3

[0068] (1) Preparation of P-Si: Add 0.3005g of diatomite powder, 0.4428g of metal magnesium powder and 4.5005g of sodium chloride powder into a ball mill and ball mill at a speed of 200r / min for 12h, then put the resulting mixture into a tube furnace In, argon gas was introduced as a protective atmosphere, and the temperature was raised to 500°C at a rate of 1°C / min for 5 hours, and then cooled to room temperature naturally, and the product was put into 3mol / L hydrochloric acid solution 65ml and stirred and washed for 0.5h, followed by centrifugation ( The centrifugation rate is 11000r / min, the same below), according to this method, cycle washing and centrifugation for 3 times, dry, then put into 30ml of 10% HF aqueous solution, stir for 30min, wash and centrifuge for 3 times, and finally, vacuum dry the product for 8h to obtain P-Si.

[0069] (2)P-Si@SiO 2 Preparation: Take 89.1 mg of P-Si obtained in step (1) and disperse it into a mixed solution consisting of 106.9 ml of a...

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Abstract

The invention discloses a silicon-carbon composite material in a bubble coral form, a manufacturing method and an application thereof. The silicon-carbon composite material comprises porous silicon and a carbon shell. An outer layer of the carbon shell is consistent with a geometrical configuration of the porous silicon, and the porous silicon and the carbon shell have a common-angle characteristic. The carbon shell grows close to a surface of the porous silicon. The porous silicon is an inner core of the silicon-carbon composite material, and a hollow gap exists between the surface of the porous silicon and the carbon shell. The silicon-carbon composite material has an effect of relieving a volume effect. A content of carbon can be reduced to the maximum extent, and the content of siliconis improved so that a theoretical specific capacity, especially a volume specific capacity, of the material is improved. The porous silicon is more uniform in pore distribution and larger in pore proportion, silicon volume expansion is effectively relieved, and structural integrity of the silicon-carbon composite material can be maintained. During transmission, a Li<+> transmission channel can be formed through holes in the surface of silicon, and transmission can be enhanced through an N element.

Description

technical field [0001] The invention belongs to the field of silicon-carbon negative electrode materials for lithium-ion batteries, and in particular relates to a silicon-carbon composite material in the form of bubble coral and its preparation method and application. Background technique [0002] In recent years, lithium-ion batteries have been widely used as energy storage devices in portable electronic devices, electric vehicles and other fields. The electrode material is one of the important factors that determine the battery performance. At present, the commercial lithium-ion battery anode material is mainly graphite, which has the advantages of low discharge voltage, good stability, and low cost. However, the specific capacity of graphite anode material is low, and its theoretical capacity is only 372mAh / g, which cannot meet the needs of society. Demand for high-performance, high-capacity lithium-ion batteries. Silicon, as the anode material of lithium-ion batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 罗学涛叶雄彪甘传海黄柳青黄柳英宋春晓
Owner XIAMEN UNIV
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