Multi-ion co-doping lithium iron phosphate material and preparation method thereof
A lithium iron phosphate and co-doping technology, which is applied in the field of multi-ion co-doped lithium iron phosphate materials and its preparation, can solve the problem of inability to ensure the uniform distribution of doping elements and occupancy, and the variation of olivine crystal system structure , reduce the electrical properties of materials and other issues, and achieve the effects of superior electrochemical performance, improved rate discharge performance, and improved discharge potential platform
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Embodiment 1
[0038] (1) Molar ratio (1-y): y, where 0.001≤y≤0.1 Weigh ferrous oxalate and ammonium vanadate into 20L deionized water, and configure a mixture with a total metal ion concentration of 0.07mol / L Solution A; Weigh ammonium dihydrogen phosphate and add it to 0.2L deionized water to make solution B with a concentration of 3mol / L; prepare an ammonia solution with a concentration of 8mol / L; pump the mixed solution A and solution B into the reaction kettle, Control the reaction temperature to 60°C, the stirring speed to 1200rpm, adjust the pH to 2.5 with ammonia water, react for 1.5h, then filter the reaction liquid, wash, and dry to obtain V-doped iron phosphate Fe containing crystal water 0.96 V 0.04 PO 4 2H 2 O.
[0039] (2) Fe obtained in step (1) 0.96 V 0.04 PO 4 2H 2 O was raised from room temperature to 400°C at a heating rate of 5°C / min for 8 hours, and the temperature was naturally lowered to obtain V-doped iron phosphate Fe without crystal water. 0.96 V 0.04 PO 4...
Embodiment 2
[0043] (1) Molar ratio (1-y): y, where 0.001≤y≤0.1 Weigh ferrous oxalate and ammonium vanadate into 20L deionized water, and configure a mixture with a total metal ion concentration of 0.1mol / L Solution A; Weigh ammonium dihydrogen phosphate and add it to 0.2L deionized water to make solution B with a concentration of 5mol / L; prepare an ammonia solution with a concentration of 10mol / L; pump the mixed solution A and solution B into the reaction kettle, Control the reaction temperature to 95°C, the stirring speed to 800rpm, adjust the pH to 3 with ammonia water, react for 0.5h, then filter, wash and dry the reaction liquid to obtain V-doped iron phosphate Fe containing crystal water 0.999 V 0.001 PO 4 2H 2 O.
[0044] (2) Fe obtained in step (1) 0.999 V 0.001 PO 4 2H 2 O was treated from room temperature to 500°C at a heating rate of 1°C / min for 5 hours, and the temperature was naturally lowered to obtain V-doped iron phosphate Fe without crystal water. 0.999 V 0.001 PO...
Embodiment 3
[0048] (1) Molar ratio (1-y): y, where 0.001≤y≤0.1 Weigh ferrous oxalate and ammonium vanadate into 20L deionized water, and configure a mixture with a total metal ion concentration of 0.05mol / L Solution A; weigh ammonium dihydrogen phosphate and add it to 0.2L deionized water to make solution B with a concentration of 0.05mol / L; prepare an ammonia solution with a concentration of 0.5mol / L; pump the mixed solution A and solution B into the reaction kettle In the process, the reaction temperature is controlled at 40°C, the stirring speed is 2500rpm, the pH is adjusted to 2 with ammonia water, and the reaction is carried out for 3 hours, then the reaction liquid is filtered, washed, and dried to obtain V-doped iron phosphate Fe containing crystal water. 0.98 V 0.02 PO 4 2H 2 O.
[0049] (2) Fe obtained in step (1) 0.98 V 0.02 PO 4 2H 2 O was treated from room temperature to 300°C at a heating rate of 2.5°C / min for 10 hours, and the temperature was naturally lowered to obt...
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