Method for recycling positive material of waste lithium iron phosphate battery
A technology for lithium iron phosphate batteries and cathode materials, which is applied to the field of recycling and utilization of waste lithium iron phosphate power batteries, can solve the problems of complex processes, difficulty in obtaining lithium iron phosphate materials, and difficulty in meeting large-scale industrial production, and achieves recycling. Simple process, uniform particle distribution and less equipment investment
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[0031] Example 1
[0032] 1) Place the used lithium iron phosphate battery on the Xinwei cycle test equipment model CT-3008W-5V3A-T and discharge it with a discharge rate of 1C (170mA / g) and a discharge voltage of 0.05V;
[0033] 2) Disassemble the discharged lithium iron phosphate battery mechanically in a fume hood, and screen out the positive electrode;
[0034] 3) The positive electrode sheet was ultrasonically peeled off in deionized water, the ultrasonic frequency was 50KHz, and the stirring speed was 300 revolutions per minute, so that the lithium iron phosphate positive electrode material was peeled off, and the aluminum foil was removed and dried in a drying box at a drying temperature of 80°C;
[0035] 4) Ball mill the dried lithium iron phosphate cathode material, the ball milling speed is 400 revolutions per minute, the ball milling time is 6 hours, the element ratio determined by ICP is Li:Fe:P=1.2:1:1; then 2g iron phosphate The lithium cathode material needs to add 2.22...
Example Embodiment
[0039] Example 2
[0040] 1) Place the used lithium iron phosphate battery on the Xinwei cycle test equipment model CT-3008W-5V3A-T and discharge it with a discharge rate of 3C (510mA / g) and a discharge voltage of 0.1V;
[0041] 2) Disassemble the discharged lithium iron phosphate battery mechanically in a fume hood, and screen out the positive electrode;
[0042] 3) The positive electrode sheet was ultrasonically peeled off in deionized water, the ultrasonic frequency was 80KHz, and the stirring speed was 200 revolutions per minute to make the lithium iron phosphate cathode material fall off. After removing the aluminum foil, it was dried in a drying oven at a drying temperature of 100°C;
[0043] 4) Ball mill the dried lithium iron phosphate cathode material, the ball milling speed is 300 revolutions per minute, the ball milling time is 8 hours, the element ratio determined by ICP is Li:Fe:P=1.2:1:1.1; then 2g iron phosphate Lithium cathode material needs to add 2.225g lithium hydro...
Example Embodiment
[0047] Example 3
[0048] 1) Place the used lithium iron phosphate battery on the Xinwei cycle test equipment model CT-3008W-5V3A-T and discharge it with a discharge rate of 5C (850mA / g) and a discharge voltage of 0.1V;
[0049] 2) Disassemble the discharged lithium iron phosphate battery mechanically in a fume hood, and screen out the positive electrode;
[0050] 3) The positive electrode sheet was ultrasonically peeled off in deionized water, the ultrasonic frequency was 100KHz, and the stirring speed was 80 revolutions per minute to make the lithium iron phosphate cathode material fall off. After removing the aluminum foil, it was dried in a drying oven at a drying temperature of 120°C;
[0051] 4) Ball mill the dried lithium iron phosphate cathode material, the ball milling speed is 200 revolutions per minute, the ball milling time is 8 hours, the element ratio determined by ICP is Li:Fe:P=1.2:1:1; then 2g iron phosphate The lithium cathode material needs to add 0.379g lithium hyd...
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