Lifepo, a cathode material for lithium-ion batteries with porous star-shaped morphology 4 and its preparation method
A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing irreversibility of charge and discharge, shortening the diffusion path of lithium ions, and poor high-rate discharge performance. Effective electrochemical contact area, easy to repeat and mass production, to meet the effect of large magnification
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Embodiment 1
[0034] With lithium acetate, iron nitrate nonahydrate, and ammonium dihydrogen phosphate as starting materials, according to Li + :Fe 3+ :PO 4 3- =1:1:1 ratio to make a solution with an iron ion concentration of 0.025mol / L, then slowly add triethylamine dropwise, the solution turns into an orange gel, and put the resulting solution into a 100mL polytetrafluoroethylene liner , the filling degree is 40%, put the inner lining into a stainless steel hydrothermal kettle, place it in a program-controlled temperature box for heat treatment, control the temperature at 180°C, and continue the reaction for 3 hours, then stir the reacted solution in an 80°C oil bath Drying gave a green precipitate. The obtained precipitate was placed in a blast drying oven and dried at 120°C for 10 hours, and the obtained porous star-shaped LiFePO 4 Precursor placed in Ar / H 2 (Ar accounts for 95V%, H 2 accounted for 5V%) in a high-temperature tube furnace protected by mixed gas at 500° C. for 6 hou...
Embodiment 2
[0037] Lithium hydroxide, iron nitrate nonahydrate, and ammonium dihydrogen phosphate are used as starting materials, according to Li + :Fe 3+ :PO 4 3- = 1:1:1 ratio to prepare a solution with an iron ion concentration of 0.025M, then slowly add triethylamine dropwise, the solution turns into an orange gel, put the resulting solution into a 100mL polytetrafluoroethylene liner, fill temperature of 40%, put the lining into a stainless steel hydrothermal kettle, and then put it into a program-controlled temperature box for heat treatment. The temperature is controlled at 190°C, and the reaction is continued for 3 hours, and then the reacted solution is dried in an 80°C oil bath. A green precipitate was obtained. The obtained precipitate was placed in a blast drying oven and dried at 120°C for 10 hours, and the obtained porous star-shaped LiFePO 4 Prepolymer placed in Ar / H 2 (Ar accounts for 95V%, H 2 accounted for 5V%) in a high-temperature tube furnace protected by mixed g...
Embodiment 3
[0039] Using lithium carbonate, iron nitrate nonahydrate, and ammonium dihydrogen phosphate as starting materials, according to Li + :Fe 3+ :PO 4 3- = 1:1:1 ratio to make a solution with an iron ion concentration of 0.02M, then slowly add triethylamine dropwise, the solution turns into an orange gel, put the resulting solution into a 100mL polytetrafluoroethylene liner, fill temperature of 50%, put the lining into a stainless steel hydrothermal kettle, and then put it into a programmable temperature box for heat treatment. The temperature is controlled at 190°C, and the reaction is continued for 10 hours, and then the reacted solution is dried in an 80°C oil bath A green precipitate was obtained. The obtained precipitate was placed in a blast drying oven and dried at 120°C for 10 hours, and the obtained porous star-shaped LiFePO 4 Prepolymer placed in Ar / H 2 (Ar accounts for 95V%, H 2 accounted for 5V%) in a high-temperature tube furnace protected by mixed gas at 350° C....
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