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
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[0030] Example 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 is evaporated, transfer to an oven for pyrolysis at 200°C for 3h, and obtain amino acid functionalized graphene after natural cooling Quantum dots. Disperse 0.5 g of nano silicon powder in a mixed solution of 60 mL of acetone, 60 mL of ethanol and 60 mL of water for 30 min. After centrifugation, add it to a mixed solution of 100 mL of deionized water, 20 mL of hydrogen peroxide and 20 mL of ammonia, and heat the reaction in a water bath at 95°C. 30min, centrifugal separation, drying to obtain hydrophilic nano silicon powder. Then dissolve 0.5g of hydrophilic nano-silica powder in 100mL of deionized water, stir vigorously, add 17mL of 5mg / mL amino acid functionalized graphene quantum dot aqueous solution dropwise, after the addition, stir for a certain period of time, centrifuge and dry to obtain 0.58g Graphene quantum dots...
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[0032] Example 2
[0033] Mix 0.5g of citric acid and 0.3428g of tryptophan, dissolve in 50mL of deionized water, heat it in a water bath at 80℃ until the water evaporates to dryness, transfer to an oven for pyrolysis at 250℃ for 3h, and obtain amino acid functionalized graphite after natural cooling Olefin quantum dots. Disperse 0.5 g of nano silicon powder in a mixed solution of 60 mL of acetone, 60 mL of ethanol and 60 mL of water for 30 min. After centrifugation, add it to a mixed solution of 100 mL of deionized water, 20 mL of hydrogen peroxide and 20 mL of ammonia, and heat the reaction in a water bath at 95°C. 30min, centrifugal separation, drying to obtain hydrophilic nano silicon powder. Then dissolve 0.5g of hydrophilic nano-silica powder in 100mL of deionized water, stir vigorously, add 17mL of 5mg / mL amino acid functionalized graphene quantum dot aqueous solution dropwise, after the addition, stir for a certain period of time, centrifuge and dry to obtain 0.58g Grap...
Example Embodiment
[0034] Example 3
[0035] Mix 0.5g of citric acid and 0.4285g of glutamine, dissolve it in 50mL of deionized water, heat it in a water bath at 80℃ until the water evaporates to dryness, transfer to an oven for thermal cracking at 200℃ for 3h, and obtain amino acid functionalized graphite after natural cooling Olefin quantum dots. Disperse 0.5 g of nano silicon powder in a mixed solution of 60 mL of acetone, 60 mL of ethanol and 60 mL of water for 30 min. After centrifugation, add it to a mixed solution of 100 mL of deionized water, 40 mL of hydrogen peroxide and 20 mL of ammonia, and heat the reaction in a water bath at 95°C. 30min, centrifugal separation, drying to obtain hydrophilic nano silicon powder. Then dissolve 0.5g of hydrophilic nano-silica powder in 100mL of deionized water, stir vigorously, add 25mL of 5mg / mL amino acid functionalized graphene quantum dot aqueous solution dropwise, after adding, stir for a certain period of time, centrifuge, and dry to obtain 0.62g ...
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