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Porous silicon@amorphous carbon/carbon nanotube composite material as well as preparation method and application thereof

A technology of amorphous carbon and carbon nanotubes, which is 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 between carbon nanotubes and porous silicon, and achieve excellent lithium battery performance, low cost, and Ease of industrialization

Active Publication Date: 2020-07-03
浙江锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Porous silicon@amorphous carbon/carbon nanotube composite material as well as preparation method and application thereof
  • Porous silicon@amorphous carbon/carbon nanotube composite material as well as preparation method and application thereof
  • Porous silicon@amorphous carbon/carbon nanotube composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

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 invention discloses a porous silicon@amorphous carbon / carbon nanotube composite material, which has a core-shell structure, an inner core is a porous silicon material, an outer shell is an amorphous carbon layer, carbon nanotubes directly grow on the surface of the amorphous carbon layer, and adjacent carbon nanotubes are intertwined to form a conductive network. The preparation method comprises the following steps: mixing porous silicon with an electronegative group on the surface, soluble salt of Ni < 2 + >, a weakly alkaline substance and water to obtain a reaction solution, controllingthe pH value of the reaction solution to be weakly alkaline, and completely reacting to obtain an intermediate product A; carrying out heat treatment on the intermediate product A in a hydrogen-containing atmosphere, and carrying out reduction to obtain an intermediate product B; and carrying out chemical vapor deposition on the intermediate product B in an atmosphere containing carbon source gas, and carrying out post-treatment to obtain the porous silicon@amorphous carbon / carbon nanotube composite material. The porous silicon@amorphous carbon / carbon nanotube composite material has excellentcycling stability and can be used as a negative electrode material of a lithium ion battery.

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