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Mesoporous carbon-coated silicon negative electrode material preparation, product and application

A negative electrode material, mesoporous carbon technology, applied in the field of preparation of mesoporous carbon-coated silicon negative electrode materials, can solve the problems of rate performance limiting battery charge and discharge speed, low energy density, and affecting the extension of lithium-ion battery applications. Achieve excellent rate performance, simple preparation process, uniform coating effect

Inactive Publication Date: 2019-04-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphite-based anode materials are currently the largest anode materials for commercial application. However, due to the low energy density of graphite batteries, with the rapid development of lithium-ion batteries, the defects of graphite anode materials have gradually emerged. The rate performance of graphite anodes It limits the charging and discharging speed of the battery, which affects the extension of the application field of lithium-ion batteries

Method used

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  • Mesoporous carbon-coated silicon negative electrode material preparation, product and application
  • Mesoporous carbon-coated silicon negative electrode material preparation, product and application
  • Mesoporous carbon-coated silicon negative electrode material preparation, product and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of mesoporous carbon-coated silicon negative electrode material is characterized in that, according to the following steps:

[0028] (1) Add 2g of silicon powder with a particle size of 100nm to 50ml of ethanol aqueous solution with a weight ratio of 1:1, and ultrasonically disperse for 30min. Add 6ml tetraethyl orthosilicate and 2.5ml octadecyltrimethoxysilane to the solution, stir at room temperature for 24 hours to form a thin mesoporous shell structure on the surface of the nano silicon powder, then centrifugally filter it, and put it into the air atmosphere In the muffle furnace, fired at 580 ° C for 7 hours to remove the surfactant in the nano-silicon, and obtained the silicon@mesoporous silicon powder with a core-shell structure.

[0029] (2) Using silicon@mesoporous silicon as a template, add 0.5g of phenol, heat at 100°C for 12h in vacuum, let the phenol enter into the mesoporous silicon, then add 0.32g of formaldehyde, heat at 130°C for 24...

Embodiment 2

[0033] A preparation method of mesoporous carbon-coated silicon negative electrode material, similar to Example 1, according to the following steps:

[0034] (1) Add 2g of silicon powder with a particle size of 100nm to 50ml of ethanol aqueous solution with a weight ratio of 1:1, and ultrasonically disperse for 30min. Add 6ml tetraethyl orthosilicate and 2.5ml octadecyltrimethoxysilane to the solution, stir at room temperature for 24 hours to form a thin mesoporous shell structure on the surface of the nano silicon powder, then centrifugally filter it, and put it into the air atmosphere In the muffle furnace, fired at 580 ° C for 7 hours to remove the surfactant in the nano-silicon, and obtained the silicon@mesoporous silicon powder with a core-shell structure.

[0035] (2) Using silicon@mesoporous silicon as a template, add 0.6g phenol, heat at 100°C for 12h in vacuum, let the phenol enter into the mesoporous silicon, then add 0.38g formaldehyde, heat at 130°C for 24h in vacu...

Embodiment 3

[0038] A preparation method of mesoporous carbon-coated silicon negative electrode material, similar to Example 1, according to the following steps:

[0039] (1) Add 2g of silicon powder with a particle size of 100nm to 50ml of ethanol aqueous solution with a weight ratio of 1:1, and ultrasonically disperse for 30min. Add 6ml tetraethyl orthosilicate and 2.5ml octadecyltrimethoxysilane to the solution, stir at room temperature for 24 hours to form a thin mesoporous shell structure on the surface of the nano silicon powder, then centrifugally filter it, and put it into the air atmosphere In the muffle furnace, fired at 580 ° C for 7 hours to remove the surfactant in the nano-silicon, and obtained the silicon@mesoporous silicon powder with a core-shell structure.

[0040] (2) Using silicon@mesoporous silicon as a template, add 0.5g of phenol, heat at 100°C for 12h in vacuum, let the phenol enter into the mesoporous silicon, then add 0.32g of formaldehyde, heat at 130°C for 24h t...

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Abstract

The invention discloses mesoporous carbon-coated silicon negative electrode material preparation, product and application. After nanometer silica fume is subjected to ultrasonic dispersion, tetraethoxysilane and octadecyltrimethoxysilane are added, stirring at room temperature is carried out, centrifugation and firing are carried out, and nanometer silicon with the surface coated with mesoporous silicon is obtained. With the mesoporous silicon-coated nanometer silicon as a template, a carbon source and an organic solvent are added, mixing and calcinations are carried out to realize carbonization, and mesoporous carbon-coated silicon composite powder is obtained. The composite powder is washed in a hydrogen fluoride solution, mesoporous silicon and silicon oxides are removed, and after drying, a mesoporous carbon-coated silicon negative electrode material is obtained. The particle size of the mesoporous carbon-coated silicon negative electrode material obtained in the method is 50 to 80nm, the material is assembled into a button cell, and through test, the material has high reversible capacity, excellent multiplying power performance and high cycle stability.

Description

technical field [0001] The invention relates to a preparation method of a carbon-coated lithium-ion battery negative electrode material, in particular to a preparation method of a mesoporous carbon-coated silicon negative electrode material and its product and application. Background technique [0002] In recent years, lithium-ion batteries, one of the new energy sources, have been widely used in mobile power sources and electric vehicles. Although lithium-ion batteries already have the highest energy density among rechargeable batteries, further improvement and enhancement of their cycle stability, rate performance, and capacity are still major research directions. [0003] As an important part of lithium-ion batteries, negative electrode materials are also the focus of further research and development of lithium-ion batteries. At present, graphite-based anode materials are currently the largest anode materials for commercial application. However, due to the low energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 何丹农卢玉英张芳吴晓燕张道明王亚坤金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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