Method for recycling positive material from water-system waste lithium iron phosphate battery
A lithium iron phosphate battery and positive electrode material technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of waste of resources, high waste rate, complicated recycling process, etc., and achieve good rate performance, high g The effect of capacity
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Example Embodiment
[0024] Example 1:
[0025] The two 60Ah water-based lithium iron phosphate batteries that have passed 2000 cycles are fully discharged after constant capacity, and the complete battery core is taken out after fine disassembly, and the positive electrode, negative electrode and separator are separated to obtain a good positive electrode sheet. Soak the positive electrode sheet in deionized water for 5 minutes to fully separate the positive electrode active material from the current collector aluminum foil, take out the aluminum foil and pour out the supernatant to obtain a mixture of positive electrode active material and deionized water; dry the above mixture at 80°C for 24 hours Afterwards, ball milling is performed to obtain the lithium iron phosphate cathode material to be regenerated, the ball milling equipment used is a planetary ball mill, the ball-to-material ratio is 15:1, and the ball milling speed is 350r / min. In the process of ball milling, each ball milled for 1 hour ...
Example Embodiment
[0026] Example 2:
[0027] Take 20g of the material to be regenerated in Example 1, add lithium carbonate to adjust the Li:Fe:P molar ratio to 1:1:1. On the basis of this ratio, further add lithium carbonate and suboxalate at a molar ratio of 1:1:1. Iron and ammonium dihydrogen phosphate, adjust the carbon content ratio of the material to 3wt.%. After the element ratio is adjusted, the material is ball-milled. The ball-milling equipment is a planetary ball mill, the ball-to-material ratio is 15:1, and the ball milling speed is 350r / min. The ball-milled material was pre-fired at 400°C for 5 hours under the protection of nitrogen, and then calcined at 750°C for 10 hours to obtain a regenerated lithium iron phosphate cathode material. Using N-methylpyrrolidone as the solvent, the lithium iron phosphate sample, the conductive agent (SuperP) and the binder were uniformly ground into a slurry at a mass ratio of 80:15:5, and coated on aluminum foil to make a positive electrode sheet. ...
Example Embodiment
[0028] Example 3:
[0029] The difference from Embodiment 2 is that the carbon content ratio of the material to be regenerated after impurity removal is adjusted to 2wt.%, and the other conditions are completely the same. After analysis and testing by Land electrochemical performance tester, the regenerated lithium iron phosphate material has a discharge capacity of 155mAh / g at 0.1C, 137mAh / g at 0.5C, 128mAh / g at 1C, and 116mAh / g at 2C. There is no loss of capacity after 50 cycles of 0.1C.
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