A petal-shaped lithium-ion battery negative electrode material vpo 4 preparation method
A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of inhomogeneous material electrochemical properties, difficult control of microscopic morphology, unfavorable physical processing performance, etc., and achieve good and excellent performance Effect of electrochemical performance, improvement of physical processing performance, and improvement of tap density
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Embodiment 1
[0024] Weigh 0.91g of vanadium pentoxide, 1.15g of diammonium hydrogen phosphate, and 1.4g of citric acid, dissolve them in 80mL of deionized water, mechanically stir in a water bath at 80°C until a uniform blue solution is formed, and adjust the pH to 7 ; Then transfer it to a polytetrafluoroethylene tank, place it in a pyrolysis tank, heat at 280°C for 30 hours, cool to room temperature, take out and filter, and dry the filtered product in a vacuum oven at 80°C. Fully grind the dried powder in an agate mortar, then place it in a sintering furnace, and sinter it at 500°C, 600°C, 700°C, 800°C for 6 hours under an argon atmosphere, and then naturally cool down to room temperature to obtain vanadium phosphate. The obtained product was analyzed by XRD, in which pure phase VPO was obtained at 600°C and 700°C 4 , the products obtained at other temperatures have VPO 4 ·H 2 O or V 2 o 5 Miscellaneous. Through SEM detection, the microscopic morphology of the materials obtained in...
Embodiment 2
[0028] Weigh 1.82g of vanadium pentoxide, 2.3g of diammonium hydrogen phosphate, and 2.8g of citric acid, dissolve them in 80mL of deionized water, stir mechanically in a water bath at 80°C until a uniform green solution is formed, and adjust the pH to 7; Then it was transferred to a polytetrafluoroethylene tank, placed in a pyrolysis tank, heated at 280°C for 30 hours, cooled to room temperature, taken out and filtered, and the filtered product was dried in a vacuum oven at 80°C. Fully grind the dried powder in an agate mortar, then place it in a sintering furnace, sinter at 700°C for 2h, 4h, 8h, 10h under an argon atmosphere, and then cool down naturally to room temperature to obtain vanadium phosphate. The obtained products are all pure phase VPO by XRD analysis 4 , through SEM detection, the microscopic morphology of the materials obtained in No. 1 and No. 2 are microspheres stacked with nanosheets, and the materials obtained in No. 3 and No. 4 have no special morphology. ...
Embodiment 3
[0032] Weigh 1.17g of ammonium metavanadate, 1.15g of diammonium hydrogen phosphate, and 1.4g of citric acid, dissolve them in 80mL of deionized water, stir mechanically in a water bath at 80°C until a uniform green solution is formed, and adjust the pH to 7; Then transfer it to a polytetrafluoroethylene tank and place it in a pyrolysis tank for heating reaction at 150°C, 200°C, 250°C, 300°C for 30 hours, cool to room temperature, take out and filter, and dry the filtered product in a vacuum oven at 80°C. The dried powder is fully ground in an agate mortar, then placed in a sintering furnace, sintered at 700°C for 6 hours under an argon atmosphere, and then naturally cooled to room temperature to obtain vanadium phosphate. The resulting product was analyzed by XRD, and only sample 3 obtained pure phase VPO 4 . Through SEM detection, the microscopic morphology of the materials obtained in No. 1, No. 2 and No. 3 are all nano-sheet structures. The obtained product was assembled...
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