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Preparation method of graphene quantum dot/nanometer silicon negative electrode material for lithium-ion battery

A technology of graphene quantum dots and lithium-ion batteries, which is applied in the field of electrochemistry, can solve the problems of high cost of nano-silicon powder, time-consuming and energy-consuming graphene, etc., and achieve the goal of simple method, low cost, and reduced loss of electrode active components Effect

Inactive Publication Date: 2016-07-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the existing research technology, the purpose of the present invention is to provide a preparation of amino acid functionalized graphene quantum dots / nano-silicon lithium-ion battery negative electrode material, which is used to solve the problem of high cost of nano-silicon powder and three-dimensional graphene. Time-consuming and energy-consuming problems caused by chemicalization and activation

Method used

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Examples

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Effect test

Embodiment 1

[0031] Mix 0.5g of citric acid and 0.3428g of histidine, dissolve in 50mL of deionized water, heat in a water bath at 80°C until the water evaporates to dryness, transfer to an oven at 200°C for thermal cracking reaction for 3 hours, and obtain amino acid functionalized graphene after natural cooling quantum dots. Disperse 0.5g of nano-silica powder in a mixed solution of 60mL acetone, 60mL ethanol and 60mL water for 30min by ultrasonic dispersion, centrifuge and add it to a mixed solution of 100mL deionized water, 20mL hydrogen peroxide and 20mL ammonia water, and heat it in a water bath at 95°C 30min, centrifugal separation, and drying to obtain hydrophilic nano silicon powder. Then dissolve 0.5g of hydrophilic nano silicon powder in 100mL of deionized water, stir vigorously, add dropwise 17mL of 5mg / mL amino acid functionalized graphene quantum dot aqueous solution, after adding, stir for a certain period of time, centrifuge and dry to obtain 0.58g Graphene quantum dot / nan...

Embodiment 2

[0033] Mix 0.5g of citric acid and 0.3428g of tryptophan, dissolve in 50mL of deionized water, heat in a water bath at 80°C until the water evaporates to dryness, transfer to an oven at 250°C for thermal cracking reaction for 3 hours, and obtain amino acid functionalized graphite after natural cooling ene quantum dots. Disperse 0.5g of nano-silica powder in a mixed solution of 60mL acetone, 60mL ethanol and 60mL water for 30min by ultrasonic dispersion, centrifuge and add it to a mixed solution of 100mL deionized water, 20mL hydrogen peroxide and 20mL ammonia water, and heat it in a water bath at 95°C 30min, centrifugal separation, and drying to obtain hydrophilic nano silicon powder. Then dissolve 0.5g of hydrophilic nano silicon powder in 100mL of deionized water, stir vigorously, add dropwise 17mL of 5mg / mL amino acid functionalized graphene quantum dot aqueous solution, after adding, stir for a certain period of time, centrifuge and dry to obtain 0.58g Graphene quantum do...

Embodiment 3

[0035] Mix 0.5g of citric acid and 0.4285g of glutamine, dissolve in 50mL of deionized water, heat in a water bath at 80°C until the water evaporates to dryness, transfer to an oven at 200°C for thermal cracking reaction for 3 hours, and obtain amino acid functionalized graphite after natural cooling ene quantum dots. Disperse 0.5g of nano silicon powder in a mixed solution of 60mL of acetone, 60mL of ethanol and 60mL of water for 30 minutes, and then add it to a mixed solution of 100mL of deionized water, 40mL of hydrogen peroxide and 20mL of ammonia water after centrifugation, and heat the reaction in a water bath at 95°C 30min, centrifugal separation, and drying to obtain hydrophilic nano silicon powder. Dissolve 0.5g of hydrophilic nano silicon powder in 100mL of deionized water, stir vigorously, add dropwise 25mL of amino acid functionalized graphene quantum dot aqueous solution of 5mg / mL, after adding, stir for a certain period of time, centrifuge and dry to obtain 0.62g...

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Abstract

The invention provides a preparation method of a graphene quantum dot / nanometer silicon negative electrode material for a lithium-ion battery. Amino acid functional graphene quantum dots are prepared by high-temperature pyrolysis of a mixture of a citric acid and an amino acid as a carbon source; and then a graphene quantum dot / nanometer silicon compound is obtained by coating the graphene quantum dots on the surface of nanometer silicon particles. A research shows that the electron / ion conductivity of a silicon negative electrode is improved by introduction of the graphene quantum dots; and the compound has significantly improved specific capacitance and high rate capability and cycling stability as the negative electrode material for the lithium-ion battery. The preparation method can be widely applied to various high-capacity lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a graphene quantum dot / nano-silicon lithium-ion battery negative electrode material, which belongs to the technical field of electrochemistry. Background technique [0002] Lithium-ion batteries are widely used in daily consumer electronics such as mobile phones, cameras, and laptops due to their significant advantages such as high energy density, long cycle life, environmental friendliness, and no memory effect. With the improvement of living standards and technological progress, people put forward higher requirements for the performance of lithium-ion batteries. For example, lithium batteries used as power for new electric vehicles should have good power characteristics and long service life in addition to ultra-high capacity. Facing the defects of lower capacity and structural instability of commercial graphite anodes. In recent years, researchers have developed a series of new carbon-based or non-c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/587H01M10/0525Y02E60/10
Inventor 李在均孔丽娟李瑞怡
Owner JIANGNAN UNIV
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