A carbon-supported monoclinic vanadium potassium fluorophosphate and its preparation and application
A technology of potassium vanadium fluorophosphate and vanadium phosphate is applied in the field of positive electrode materials of potassium ion batteries, which can solve the problems of low theoretical energy density and low voltage platform, and achieves improved rate performance and discharge specific capacity, improved rate performance, and good application prospects. Effect
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Embodiment 1
[0026] Embodiment 1: (VPO 4 Preparation of KVPO by High Temperature Melting Method 4 F, carbon content 3%)
[0027] Weigh 0.5810g potassium fluoride (as fluorine source and potassium source at the same time) and 0.7297g vanadium phosphate (as vanadium source and phosphate at the same time), add to 100ml crucible, react at 1000 ℃ for 1 hour, the mixture precursor obtained After grinding, add sucrose with a mass fraction of 30% and 70ml of water, mix well and add to the ball mill jar together with the agate balls. Ball mill at room temperature for 24 hours. The obtained suspension was transferred into a 500mL round bottom flask, and the solvent was removed by rotary evaporation, and then dried in a vacuum oven at 120°C for 12h. Grind the obtained solid and add it to a porcelain boat. The mixture is pre-sintered at 350°C for 5 hours, sintered at 750°C for 8 hours under an argon atmosphere, and the final product KVPO is obtained after cooling. 4 F@3%C (3% carbon mass content...
Embodiment 2
[0028] Embodiment 2: (VPO 4 Preparation of KVPO by High Temperature Melting Method 4 F, carbon content 9%)
[0029] Weigh 0.5810g potassium fluoride (as fluorine source and potassium source at the same time) and 0.7297g vanadium phosphate (as vanadium source and phosphate at the same time), add to 100ml crucible, react at 1000 ℃ for 1 hour, the mixture precursor obtained After grinding, add sucrose with a mass fraction of 50% and 70ml of water, mix well and add to the ball mill jar together with the agate balls. Ball mill at room temperature for 24 hours. The obtained suspension was transferred into a 500mL round bottom flask, and the solvent was removed by rotary evaporation, and then dried in a vacuum oven at 120°C for 12h. Grind the obtained solid and add it to a porcelain boat. The mixture is pre-sintered at 350°C for 5 hours, sintered at 750°C for 8 hours under an argon atmosphere, and the final product KVPO is obtained after cooling. 4 F@9%C. It can be known that ...
Embodiment 3
[0030] Embodiment 3: (VPO 4 Preparation of KVPO by High Temperature Melting Method4 F, carbon content 14%)
[0031] Weigh 0.5810g potassium fluoride (as fluorine source and potassium source at the same time) and 0.7297g vanadium phosphate (as vanadium source and phosphate at the same time), add to 100ml crucible, react at 1000 ℃ for 1 hour, the mixture precursor obtained After grinding, add sucrose with a mass fraction of 80% and 70ml of water, mix well and add to the ball mill jar together with the agate balls. Ball mill at room temperature for 24 hours. The obtained suspension was transferred into a 500mL round bottom flask, and the solvent was removed by rotary evaporation, and then dried in a vacuum oven at 120°C for 12h. Grind the obtained solid and add it to a porcelain boat. The mixture is pre-sintered at 350°C for 5 hours, sintered at 750°C for 8 hours under an argon atmosphere, and the final product KVPO is obtained after cooling. 4 F@14%C. It can be known that ...
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