Method for preparing spherical composite anode material fluorine lithium vanadium phosphate-lithium vanadium phosphate of lithium ion battery
A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cycle performance and rate performance need to be further improved, and achieve easy oxidation, fine particles, and excellent electrochemical performance. Effect
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Embodiment 1
[0030] Using lithium hydroxide, lithium fluoride, vanadium pentoxide, and ammonium dihydrogen phosphate as raw materials, press 0.5LiVPO 4 F. Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of the ingredients, adding oxalic acid (added by 2 times the theoretical amount), ball milling until the pentavalent vanadium is completely reduced to trivalent vanadium, adding water to dissolve and disperse, and then spray-dry the resulting suspension, the air inlet temperature 110°C, the air outlet temperature is 100°C, and finally in an argon atmosphere at 500°C, 600°C, 700°C, 800°C and 900°C for 24 hours to obtain a spherical composite cathode material 0.5LiVPO 4 F. Li 3 V 2 (PO 4 ) 3 , The resulting product was assembled into a button battery and its charge and discharge capacity and rate performance were measured within the voltage range of 3.0-4.5V. Charge and discharge at different rates, the first discharge specific capacity is shown in Table 1.
[0031] Experimental conditio...
Embodiment 2
[0034] Using lithium carbonate, vanadium trifluoride, ammonium metavanadate, and diammonium hydrogen phosphate as raw materials, press 5LiVPO 4 F. Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of ingredients, adding ascorbic acid (adding 5 times the theoretical amount), then adding water, and mixing evenly, stirring at a constant temperature in a water bath at 50 ° C until the pentavalent vanadium is completely reduced to trivalent vanadium and a uniform solution is generated. Then the resulting solution was spray-dried, the air inlet temperature was 250°C, the air outlet temperature was 130°C, and finally kept at 700°C in a nitrogen atmosphere for 2, 6, 12, and 18 hours to obtain the spherical composite cathode material 5LiVPO 4 F. Li 3 V 2 (PO 4 ) 3 , the resulting product was assembled into a button battery, and its charge and discharge capacity and rate performance were measured within the voltage range of 3.0 to 4.5V. The charge and discharge were carried out at diff...
Embodiment 3
[0038] Using lithium hydrogen fluoride, ammonium fluoride, vanadium dioxide, and triammonium phosphate as raw materials, press 50LiVPO 4 F. Li 3 V 2 (PO 4 ) 3Add hydrazine hydrate (according to 3 times the theoretical amount) and water, keep the temperature in a water bath at 20°C until the tetravalent vanadium is completely reduced to trivalent vanadium and form a uniform solution, and then the resulting solution is spray-dried , the air inlet temperature is 300°C, the air outlet temperature is 180°C, and finally kept at 650°C for 10 hours in a nitrogen atmosphere to obtain a spherical composite cathode material 20LiVPO 4 F. Li 3 V 2 (PO 4 ) 3 , the resulting product was assembled into a button battery, and its charge and discharge capacity and rate performance were measured within the voltage range of 3.0 to 4.5V. The charge and discharge were carried out at different rates, and its first discharge ratio at 0.5C, 2C, 5C and 10C rates The capacity is 150.7mAh·g -1 , ...
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