A kind of porous silicon@amorphous carbon/carbon nanotube composite material and its preparation method and application

A technology of amorphous carbon and carbon nanotubes, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve problems such as the inability to build a conductive network with carbon nanotubes and porous silicon, achieve excellent lithium battery performance, facilitate industrialization, Simple and controllable preparation process

Active Publication Date: 2021-05-25
浙江锂宸新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This preparation process grows carbon nanotubes in situ on the surface of porous silicon by vapor deposition, but this process simply mixes the catalyst precursor - nickel nitrate and porous silicon mechanically, and the catalyst precursor is not completely attached to the porous silicon. Therefore, the carbon nanotubes produced in the chemical vapor deposition process are not grown on the porous silicon in situ, and the final product is equivalent to mechanically mixing the porous silicon and the carbon nanotubes together, which cannot achieve the joint construction of the carbon nanotubes and the porous silicon. the goal of

Method used

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  • A kind of porous silicon@amorphous carbon/carbon nanotube composite material and its preparation method and application
  • A kind of porous silicon@amorphous carbon/carbon nanotube composite material and its preparation method and application
  • A kind of porous silicon@amorphous carbon/carbon nanotube composite material and its preparation method and application

Examples

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Embodiment 1

[0065] (1) Take 2g commercial Mg 2 Si is placed in a corundum boat as a raw material, and placed in a tube furnace for heat treatment. The heating rate is 20°C / min, the reaction temperature is 650°C, the reaction time is 5h, and the reaction atmosphere is air. The reacted product was placed in 0.1M hydrochloric acid and stirred for 8 hours. After the reaction, the porous silicon in the suspension was centrifuged three times with deionized water, and dried in a vacuum oven at 80° C. for later use.

[0066] (2) The porous silicon prepared in step (1) is mixed with water according to porous silicon: nickel nitrate hexahydrate: urea=1:0.5:2.5 (molar ratio) to form a solution, and the concentration of nickel ions in the solution is 0.1mol / L , subjected to constant temperature magnetic stirring at a temperature of 80° C. for 8 hours, and finally the resulting solution was centrifuged, washed three times with water and once with ethanol, and dried in vacuum at 80° C. to obtain an in...

Embodiment 2

[0080] The preparation process is exactly the same as that in Example 1, except that the heat treatment temperature in step (3) is replaced by 450°C, and the CVD treatment temperature in step (4) is replaced by 600°C.

[0081] It can be seen through testing that the appearance of the product is similar to that of the final product prepared in Example 1.

Embodiment 3

[0083] The preparation process is exactly the same as that in Example 1, except that the heat treatment temperature in step (3) is replaced by 700°C, and the CVD treatment temperature in step (4) is replaced by 700°C.

[0084] It can be seen through testing that the appearance of the product is similar to that of the final product prepared in Example 1.

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Abstract

The method of the invention discloses a porous silicon@amorphous carbon / carbon nanotube composite material, which has a core-shell structure, the inner core is a porous silicon material, the outer shell is an amorphous carbon layer, and carbon nanotubes are directly grown on the surface of the amorphous carbon layer. Adjacent carbon nanotubes are intertwined to form a conductive network. The preparation method includes: porous silicon with electronegative groups on the surface, Ni 2+ soluble salts, weakly alkaline substances and water are mixed to obtain a reaction solution, the pH of the reaction solution is controlled to be weakly alkaline, and the intermediate product A is obtained after the reaction is complete; the intermediate product A is heat-treated in an atmosphere containing hydrogen, and after reduction The intermediate product B is obtained; the intermediate product B is then subjected to chemical vapor deposition in an atmosphere containing carbon source gas, and the porous silicon@amorphous carbon / carbon nanotube composite material is obtained after post-treatment. The porous silicon@amorphous carbon / carbon nanotube composite material has excellent cycle stability and can be used as an anode material for lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-ion batteries, in particular to a porous silicon@amorphous carbon / carbon nanotube composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in daily life, such as household appliances, electric vehicles, etc., due to their high specific capacity, long service life, and environmental protection. However, the currently used graphite anode is difficult to meet the increasing demand due to the limitation of its low theoretical capacity. Silicon (Si) has a very high theoretical capacity (~4200mAhg -1 ), low lithiation potential, and abundant resources, and thus are considered to be the most promising alternatives. However, there are still some problems in the commercial application of silicon anodes. First, silicon anodes always experience large volume expansion during lithium inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 林扬帆张亚光
Owner 浙江锂宸新材料科技有限公司
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