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Lithium-ion battery graphitized mesoporous carbon/silicon composite anode materials and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., to achieve high lithium storage capacity, long cycle life, and good safety performance

Inactive Publication Date: 2012-05-16
李溪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But from the perspective of application, the first charge and discharge efficiency of this material needs to be further improved

Method used

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  • Lithium-ion battery graphitized mesoporous carbon/silicon composite anode materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Weigh 3.0 grams of SBA-15 of two-dimensional hexagonal p6m and impregnate it into 28.5ml of Ni(NO 3 ) 2 ethanol aqueous solution, and stirred at 35-85°C for 10 hours until the solvent was completely evaporated and dried. The above Ni / SBA-15 was impregnated into a solution containing 3.75g of sucrose, 0.42g of sulfuric acid and 15.0g of water, dried at 100°C for 6 hours after thorough stirring, then heat-treated at 160°C for 6 hours, cooled and then dipped again But the amount of sucrose and sulfuric acid is 50-60% of the original. Then, the composite was carbonized and catalyzed graphitized at 900°C under a nitrogen atmosphere for 6 hours, and the silicon oxide was etched and removed with 2 mol / L NaOH to obtain a partially graphitized and Ni-containing ordered mesoporous carbon CMK-3.

[0015] Weigh 2 grams of the above-mentioned partially graphitized and Ni-containing ordered mesoporous carbon CMK-3, spread it in a quartz boat and place it in a vacuum tube furnace, a...

Embodiment 2

[0017] Take by weighing 3.0 grams of SBA-15 of two-dimensional hexagonal p6m and impregnate it into 28.5ml of Fe(NO 3 ) 3 ethanol aqueous solution, and stirred at 35-85°C for 10 hours until the solvent was completely evaporated and dried. Immerse the above-mentioned Fe / SBA-15 into a solution containing 3.75 grams of sucrose, 0.42 grams of sulfuric acid and 15.0 grams of water, dry at 100°C for 6 hours after thorough stirring, then heat-treat at 160°C for 6 hours, and repeat the dipping once after cooling But the amount of sucrose and sulfuric acid is 50-60% of the original. Then the composite was carbonized and catalyzed graphitized at 950°C for 4 hours under a nitrogen atmosphere, and the silicon oxide was etched and removed with 2 mol / L NaOH to obtain a partially graphitized and Fe-containing ordered mesoporous carbon CMK-3.

[0018] Weigh 2 grams of the above-mentioned partially graphitized and Fe-containing ordered mesoporous carbon CMK-3, spread it in a quartz boat and ...

Embodiment 3

[0020] Weigh 3.0 grams of SBA-15 of two-dimensional hexagonal p6m and impregnate it into 28.5ml of Co(NO 3 ) 2 ethanol aqueous solution, and stirred at 35-85°C for 10 hours until the solvent was completely evaporated and dried. Immerse the above Co / SBA-15 into a solution containing 3.75g of sucrose, 0.42g of sulfuric acid and 15.0g of water, stir well and dry at 100°C for 6 hours, then heat-treat at 160°C for 6 hours, then repeat the impregnation once after cooling But the amount of sucrose and sulfuric acid is 50-60% of the original. Then the composite was carbonized and catalyzed graphitized at 900°C for 4 hours under a nitrogen atmosphere, and the silicon oxide was etched and removed with 2 mol / L NaOH to obtain a partially graphitized and Co-containing ordered mesoporous carbon CMK-3.

[0021] Weigh 2 grams of the above-mentioned partially graphitized and Co-containing ordered mesoporous carbon CMK-3, spread it in a quartz boat and place it in a vacuum tube furnace, and h...

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Abstract

The invention discloses lithium-ion battery graphitized mesoporous carbon / silicon composite anode materials and a preparation method thereof. Mesoporous carbon materials with different degrees of graphitization are synthesized by using mesoporous silicon oxide as a hard template and combining transition metal (Fe, Ni, Co, etc) catalysis, and the mesoporous carbon materials are used as the carrier to deposit amorphous silicon on the mesoporous carbon pore walls through the chemical vapor deposition (CVD) technology to obtain the graphitized mesoporous carbon / silicon composite anode materials. The composite materials have stable performance; and when used as the anode materials of the lithium-ion battery, the composite materials have the advantages of large lithium storage capacity, long life, high safety and the like.

Description

technical field [0001] The invention relates to a lithium-ion battery graphitized mesoporous carbon / silicon composite negative electrode material and a preparation method thereof, and relates to the technical fields of electrochemistry and material synthesis. It is characterized in that mesoporous carbon obtained by catalyzed graphitization by a hard template method combined with transition metals (Ni, Fe, Co, etc.) is used as a carrier, and amorphous silicon is deposited on the mesoporous carbon pore wall by a chemical vapor phase method. The composite negative electrode material of the present invention is characterized in that it has the advantages of high lithium storage capacity, long service life, good safety and the like when used as the negative electrode material in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been increasingly widely used due to their advantages such as high open circuit voltage, high energy density, and good cycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/139H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 李溪王燕刚朱培怡康诗飞黄苏君蒋圣张成丽
Owner 李溪
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