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High-performance silicon/graphene oxide negative electrode material based on chemical bond and preparation method thereof

A graphene negative electrode, high-performance technology, applied in the direction of nanotechnology for materials and surface science, battery electrodes, structural parts, etc., can solve the problems that the electrochemical performance needs to be further improved, to prevent falling off or agglomeration, and improve cycle The effect of lifespan and simple manufacturing process

Inactive Publication Date: 2013-12-11
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have improved the cycle rate performance of silicon-based negative electrodes to a certain extent, their electrochemical performance still needs to be further improved.

Method used

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  • High-performance silicon/graphene oxide negative electrode material based on chemical bond and preparation method thereof
  • High-performance silicon/graphene oxide negative electrode material based on chemical bond and preparation method thereof
  • High-performance silicon/graphene oxide negative electrode material based on chemical bond and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] first step: Add 100 mg of nano-silica powder into 100 ml of concentrated hydrochloric acid (36%wt), ultrasonically disperse for 20 minutes, and magnetically stir in an oil bath at 50 °C, where the stirring speed is 300 rpm and the stirring time is 4 hours. The silicon powder activated by concentrated hydrochloric acid was collected by filtration, washed three times with deionized water, washed once with alcohol, and dried under vacuum at 80 °C overnight. Dissolve 1 g of aminopropyltriethoxysilane in 200 ml of toluene, and stir magnetically at room temperature for 5 hours (200 rpm) to fully dissolve. Take 100 mg of silicon powder activated by hydrochloric acid and add it to the prepared surfactant solution, ultrasonically disperse for 50 minutes, and condense and reflux at 110 ° C for 24 hours. Finally, the modified silica powder was collected by filtration, washed with deionized water and dried under vacuum at 60 °C overnight.

[0027] Step two: Add 100 mg of modif...

Embodiment 2

[0030] first step: Add 70 mg of nano-silica powder into 100 ml of concentrated hydrochloric acid (38%wt), ultrasonically disperse for 30 minutes, and magnetically stir in an oil bath at 70°C, where the stirring speed is 200 rpm and the stirring time is 3 hours. The silicon powder activated by concentrated hydrochloric acid was collected by filtration, washed three times with deionized water, washed once with alcohol, and dried under vacuum at 65° C. overnight. Dissolve 1 g of aminopropyltrimethoxysilane in 200 ml of toluene, and stir magnetically at room temperature for 3 hours (200 rpm) to fully dissolve it. Take 70 mg of silicon powder activated by hydrochloric acid and add it to the prepared surfactant solution, ultrasonically disperse for 40 minutes, and condense and reflux at 150 ° C for 3 hours. Finally, the modified silica powder was collected by filtration, washed with deionized water and dried under vacuum at 65 °C overnight.

[0031] Step two: Basically the same...

Embodiment 3

[0034] first step: Add 800 mg of submicron silicon powder into a mixed solution of 100 mL of concentrated hydrochloric acid (38%wt) and 25 mL of 20%wt hydrogen peroxide solution, ultrasonically disperse for 60 minutes, and stir magnetically in an oil bath at 30°C, where the stirring speed 500 rev / min, stirring time is 1 hour. The silicon powder activated by concentrated hydrochloric acid was collected by filtration, washed three times with deionized water, washed once with alcohol, and dried in vacuum at 100 °C overnight. 0.2 g of dopamine was dissolved in 100 ml of alcohol-deionized water mixed solution, and magnetically stirred at room temperature for 2 hours (200 rpm) to allow it to fully dissolve. Take 800 mg of silicon powder activated by hydrochloric acid and add it to the prepared surfactant solution, ultrasonically disperse for 15 minutes, and condense and reflux at 65 °C for 40 hours. Finally, the modified silica powder was collected by filtration, washed with deio...

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Abstract

The invention discloses high-performance silicon / graphene oxide negative electrode material based on chemical bond and a preparation method thereof. The chemical bond effect between micron and nano silica powder and graphene oxide is realized by performing surface modification to micron and nano silica powder, so that the micron and nano silica powder and the graphene oxide can be uniformly compounded, and the purpose of effectively improving the cycle performance is achieved. The silicon / graphene oxide composite material has the advantages of high specific discharge capacity, excellent rate performance and cycle performance and the like, and belongs to potential lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a high-performance silicon / graphene oxide negative electrode material based on (weak) chemical bonds and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices due to their high energy density, and have become the main power source for electric vehicles. Many researchers in various fields such as chemistry, materials and chemical engineering are actively developing various new lithium-ion battery materials and electrolytes to further increase the energy density of lithium-ion batteries, thereby promoting their application in electric vehicles and large-scale energy storage devices . At present, the main bottleneck restricting the development of lithium-ion batteries is the capacity limitation of cathode materials. However, with the continuous progress in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 邓远富孙诚覃旭松徐辉陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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