A kind of preparation method and application of tin oxide-nitrogen doped graphene aerosol composite material
A nitrogen-doped graphene and composite material technology, applied in the fields of material science and electrochemistry, can solve problems such as unfavorable ion transfer, unavailability of active capacity, poor rate capability, etc., and achieves easy control of composition and morphology, and stable structure. , the effect of high capacitance
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Embodiment 1
[0025] Add 1.5ml of concentrated ammonia water to 150ml with a concentration of 2mgml -1 In the graphene oxide aqueous dispersion, stir for 30min until the mixture is uniform; then add 0.8g of tin tetrachloride and 160mg of PVP (Mw=55000) into the solution, stir to dissolve, and ultrasonically disperse for 1h until the solution is uniformly mixed; then All the mixed solution was transferred to a hydrothermal reaction kettle and kept at 160°C for 12 hours; after the reaction, the product was dialyzed in ultrapure water for at least one day; then the sample was frozen at -20°C for 4 hours, and then cooled at -53°C and -30Pa Freeze-drying at least 12h; the obtained sample was vacuum-dried at 70°C for 10h, and then heat-treated at 550°C for 3h in an argon atmosphere to obtain a tin oxide-nitrogen-doped graphene aerosol material. It has been determined that the average particle size of tin oxide particles is 5nm, and the capacity remains at 1100mAhg after 100 cycles -1 Around 97% ...
Embodiment 2
[0027] Add 3ml of concentrated ammonia water to 600ml with a concentration of 0.5mgml -1 In the graphene oxide aqueous dispersion, stir for 30min until the mixture is uniform; then add 1.0g of tin tetrachloride and 250mg of PVP (Mw=55000) into the solution, stir to dissolve, and ultrasonically disperse for 1h until the solution is uniformly mixed; then All the mixed solution was transferred to a hydrothermal reaction kettle and kept at 100°C for 24h; after the reaction, the product was dialyzed in ultrapure water for at least one day; Freeze-drying at least 12h; the obtained sample was vacuum-dried at 70°C for 10h, and then heat-treated at 550°C for 3h in an argon atmosphere to obtain a tin oxide-nitrogen-doped graphene aerosol material. It has been determined that the average particle size of the tin oxide material is 4nm, and the capacity remains at 920mAhg after 100 cycles -1 Around 97% Coulombic efficiency.
Embodiment 3
[0029] Add 1.5ml of concentrated ammonia water to 100ml with a concentration of 3mgml -1 Graphene oxide aqueous dispersion, stirred for 30min until uniformly mixed; then 0.6g of stannous sulfate and 75mg of PVP (Mw=55000) were added to the solution, stirred and dissolved, ultrasonically dispersed for 1h until the solution was uniformly mixed; then the mixed All the liquids were transferred to a hydrothermal reaction kettle and kept at 180°C for 8 hours; after the reaction, the product was dialyzed in ultrapure water for at least one day; Freeze-drying for at least 12 hours; the obtained sample was vacuum-dried at 70° C. for 10 hours, and then heat-treated at 550° C. for 3 hours in an argon atmosphere to obtain a tin oxide-nitrogen-doped graphene aerosol material. It has been determined that the average particle size of the tin oxide material is 5nm, and the capacity remains at 1040mAhg after 100 cycles -1 Around 97% Coulombic efficiency.
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