Preparation method of spherical lithium ion battery positive electrode material LiVPO4F
A technology for lithium-ion batteries and cathode materials, applied in the preparation of cathode materials for lithium-ion batteries, in the field of spherical lithium-ion battery cathode materials LiVPO4F, can solve the problems of difficult preparation of pure-phase LiVPO, complex synthesis process, low electronic conductivity, etc., to achieve Conducive to the effect of transmission de-embedding and simplifying the experimental process
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Embodiment 1
[0025] Weigh 0.91g of vanadium pentoxide, 1.15g of diammonium hydrogen phosphate, 0.13g of lithium fluoride, and 1.4g of citric acid, add 1000mL of deionized water, dissolve them in the autoclave, and adjust the pH to 3. The heating temperature is 300°C, the heating time is 15H, and the internal pressure of the autoclave is 4MPa; 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 600°C, 650°C, 700°C, 750°C for 2 hours under an argon atmosphere, and then naturally cool down to room temperature to obtain the finished product LiVPO 4 F. The obtained product was analyzed by XRD, in which pure phase LiVPO was obtained at 600°C and 650°C 4 F, the products obtained at other temperatures have Li 3 V 2 (PO 4 ) 3 and V 2 o 3 Miscellaneous. The microscopic morphology of the obtained materials was detected by SEM. The obtained ...
Embodiment 2
[0029] Weigh 0.91g of vanadium pentoxide, 1.15g of diammonium hydrogen phosphate, 0.13g of lithium fluoride, and 1.4g of citric acid, add 1000mL of deionized water, dissolve them in the autoclave, and adjust the pH to 3. The heating temperature is 300°C, the heating time is 15H, and the internal pressure of the autoclave is 4MPa; 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, sinter at 650°C under an argon atmosphere for 0.5h, 2h, 4h, 6h, and then cool down naturally to room temperature to obtain the finished product LiVPO 4 F. Gained product all obtains pure phase LiVPO through XRD analysis 4 F. The microscopic morphology of the obtained materials detected by SEM is spherical, and the size of the spherical materials gradually increases with the prolongation of sintering time. The obtained product was assembled into an experimental bu...
Embodiment 3
[0033] Weigh 0.91g of vanadium pentoxide, 1.15g of diammonium hydrogen phosphate, 0.13g of lithium fluoride, 1.4g of citric acid, add 1000mL of deionized water, dissolve them in the autoclave, adjust the pH=1, 6, 8 , 12. The heating temperature of the autoclave is 300°C, the heating time is 15H, and the internal pressure of the autoclave is 4MPa; cool to room temperature, take out and filter, and dry the filtered product in a vacuum oven at 80°C. The dried powder was fully ground in an agate mortar, then placed in a sintering furnace, sintered at 650°C for 2 hours under an argon atmosphere, and then cooled naturally to room temperature to obtain the finished LiVPO 4 F. Gained product all obtains pure phase LiVPO through XRD analysis 4 F, through SEM detection, only the microscopic morphology of the material obtained from No. 1 is spherical, and the others have no special morphology. . The obtained product was assembled into an experimental button battery to measure its char...
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