Sodium vanadium phosphate nano-sheet, preparation method and application thereof
A technology of sodium vanadium phosphate and nanosheets, which is applied in the direction of nanotechnology, chemical instruments and methods, and phosphorus compounds. It can solve the problems of low product dispersion and easy agglomeration of sodium vanadium phosphate electrode materials, and achieve fast ion and electron diffusion rates. , good battery cycle stability, high dispersion effect
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Embodiment 1
[0049] Weigh 0.756g of oxalic acid dihydrate, add it into 20mL of water, dissolve it by ultrasonic, then add 0.364g of vanadium pentoxide, stir and react in an oil bath at 70°C for 2h. Then add 0.936g of sodium dihydrogen phosphate dihydrate and 0.13g of sucrose into the solution, stir and react for 30min, then add 10mL of ethylene glycol solution, stir for 1h. After the reaction was completed, 50 mL of n-propanol solution was added at a rate of 2 mL / min, and the mixture was reacted for 30 min to obtain a precursor mixture. The obtained precursor mixture was separated by centrifugation, and then freeze-dried for 24 hours to obtain the precursor. The obtained precursor was heated in a tube furnace at 5 °C / min to 400 °C, 5% H 2 / Ar atmosphere, pre-calcined for 4 hours, then heated to 700 ° C, calcined at high temperature for 8 hours, and then cooled to room temperature to prepare sodium vanadium phosphate nanosheets.
Embodiment 2
[0051]Weigh 0.756g of oxalic acid dihydrate, add it into 20mL of water, dissolve it by ultrasonic, then add 0.364g of vanadium pentoxide, stir and react in an oil bath at 70°C for 2h. Then add 0.936g of sodium dihydrogen phosphate dihydrate and 0.13g of sucrose into the solution, stir and react for 30min, then add 40mL of ethylene glycol solution, stir for 1h. After the reaction was completed, 60 mL of n-propanol solution was added at a rate of 2 mL / min, and the mixture was reacted for 30 min to obtain a precursor mixture. The obtained precursor mixture was separated by centrifugation, and then freeze-dried for 24 hours to obtain the precursor. The obtained precursor was heated in a tube furnace at 5 °C / min to 400 °C, 5% H 2 / Ar atmosphere, pre-calcined for 4 hours, then heated to 700 ° C, calcined at high temperature for 8 hours, and then cooled to room temperature to prepare sodium vanadium phosphate nanosheets.
Embodiment 3
[0053] Weigh 0.756g of oxalic acid dihydrate, add it into 20mL of water, dissolve it by ultrasonic, then add 0.364g of vanadium pentoxide, stir and react in an oil bath at 80°C for 2h. Then add 0.950 g of sodium dihydrogen phosphate dihydrate and 1.0 g of glucose into the solution, stir and react for 30 minutes, then add 100 mL of ethylene glycol solution, and stir for 1 hour. After the reaction was completed, 200 mL of n-propanol solution was added at a rate of 4 mL / min, and the mixture was reacted for 50 min to obtain a precursor mixture. The obtained precursor mixture was centrifuged and then air-dried at 50° C. for 24 hours to obtain a precursor. The obtained precursor was heated to 400 °C in a tube furnace at a heating rate of 10 °C / min, 5% H 2 / Ar atmosphere, pre-calcined for 4 hours, then heated to 700 ° C for 8 hours, and then cooled to room temperature to prepare sodium vanadium phosphate nanosheets.
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