Tin oxide quantum dot/fluorinated graphene composite electrode used for sodium-ion battery
A technology of fluorinated graphene and sodium ion batteries, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as too fast capacity decay, large volume changes, and difficulty in embedding , to achieve the optimal balance of cycle life, low energy consumption and low cost
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Embodiment 1
[0027] Disperse 5 mg of commercial fluorinated graphite in 20 ml of N-methylpyrrolidone, and obtain a single-layer fluorinated graphene dispersion by ultrasonic treatment; 221 mg of SnCl 4 ·5H 2 O and 20 mg NH 4 Cl was dissolved in 100 ml of deionized water and stirred thoroughly; the above two solutions were stirred at 60°C for 2 hours, then transferred to a reaction kettle and reacted at 180°C for 24 hours; then centrifuged, washed and dried in vacuo A tin oxide quantum dot / fluorinated graphene composite negative electrode material is obtained, wherein the weight percentage of tin oxide is 95%. The resulting product was analyzed by XRD and was SnO 2 , fluorinated graphene is not shown due to its low content and complete exfoliation, see figure 1 . After structural analysis, the product is a layered structure with a size of 0.2-10 μm, wherein the tin oxide quantum dot particle size is 4-6 nm, and is uniformly dispersed on the fluorinated graphene sheet (see figure 2 ). ...
Embodiment 2
[0037] Disperse 10 mg of commercial fluorinated graphite in 40 ml of N,N dimethylformamide, and obtain a single-layer fluorinated graphene dispersion by ultrasonic treatment; 135 mg of SnCl 2 2H 2 O and 15 mg (NH 4 ) HSO 4Dissolve in 80 ml of deionized water and stir thoroughly; stir the above two solutions at 60°C for 2 hours, then transfer them to a reaction kettle and react at 190°C for 16 hours; then centrifuge, wash and vacuum dry to obtain A tin oxide quantum dot / fluorinated graphene composite negative electrode material, wherein the weight percentage of tin oxide is 90%. The obtained product was analyzed as SnO by XRD 2 . According to structural analysis, the product is a layered structure with a size of 0.5-15 μm, in which tin oxide quantum dots have a particle size of 3-5 nm, and are uniformly dispersed on the fluorinated graphene sheet. The composite negative electrode material prepared in this embodiment is used as the working electrode, the sodium metal is use...
Embodiment 3
[0039] Disperse 20 mg of commercial fluorinated graphite in 80 ml of ethylene glycol, and obtain a single-layer fluorinated graphene dispersion through ultrasonic treatment; 141 mg of Na 2 SnO 3 ·3H 2 O and 20 mg NH 4 F was dissolved in 240 ml of deionized water and stirred thoroughly; the above two solutions were stirred at 60°C for 2 hours, then transferred to a reaction kettle and reacted at 200°C for 12 hours; then centrifuged, washed and dried in vacuo A tin oxide quantum dot / fluorinated graphene composite negative electrode material is obtained, wherein the weight percentage of tin oxide is 80%. The obtained product was analyzed as SnO by XRD 2 . According to structural analysis, the product is a layered structure with a size of 1-20 μm, in which tin oxide quantum dots have a particle size of 2-5 nm, and are uniformly dispersed on the fluorinated graphene sheet. The composite negative electrode material prepared in this embodiment is used as the working electrode, t...
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