A kind of in-situ regeneration method of waste lithium iron phosphate battery cathode material
A technology for lithium iron phosphate batteries and positive electrode materials, which is applied in battery recycling, chemical instruments and methods, phosphorus compounds, etc., can solve the problem of in-situ regeneration of lithium iron phosphate materials, the inability to guarantee the electrochemical performance of positive electrode materials, and the uniformity of material particles In order to achieve the effect of shortening the dismantling time, realizing mechanical dismantling, controllable and uniform particle size, etc.
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Embodiment 1
[0040] S1 First discharge the waste lithium-ion battery in 5% NaCl saline solution for 4 hours, so that the battery voltage is lower than 2V, and then automatically disassemble and separate the positive and negative mixed powder, battery shell by crushing, magnetic separation, screening and other physical methods , copper foil, aluminum foil and separator, after dismantling, the battery case, copper foil, aluminum foil and separator are directly recycled;
[0041] S2 At an ambient temperature of 25°C, add 200mL of 2M NaOH solution to 100g of the separated positive and negative electrode mixed powder, and stir in the mixer at a stirring rate of 500rpm for 1h to fully dissolve the positive and negative electrode mixed powder, and separate the solid and liquid. Then recover the Al element from the filtrate;
[0042] S3 At 60°C, put the mixed positive and negative electrode powder filtered out in step S2 after removing Al into 1000mL 2M hydrochloric acid for reaction and stirring ...
Embodiment 2
[0048] S1 discharges the waste lithium-ion battery through the charging and discharging machine for about 4 hours (multiple discharges to ensure that the battery voltage is lower than 1V), and then automatically disassembles and separates the positive and negative mixed powder through physical methods such as crushing, magnetic separation, and screening , battery case, copper foil, aluminum foil and diaphragm, and the battery case, copper foil, aluminum foil and diaphragm are directly recycled after dismantling;
[0049] S2 At a temperature of 30°C, add 200 g of the separated positive and negative electrode mixed powder into 500 mL of 2M NaOH solution, and stir in the mixer at a stirring rate of 500 rpm for 2 hours to fully dissolve the positive and negative electrode mixed powder. Al element is recovered in the filtrate;
[0050] S3 At 70°C, put the mixed positive and negative electrode powder filtered out in step S2 into 2000mL 2M hydrochloric acid and stir for 2h at a tempe...
Embodiment 3
[0055] S1 Discharge the waste lithium-ion battery for about 4 hours with a charge-discharge machine (multiple discharges to ensure that the battery voltage is lower than 1V), and then automatically disassemble and separate the positive and negative mixed powder through physical methods such as crushing, magnetic separation, and screening. , battery case, copper foil, aluminum foil and diaphragm, and the battery case, copper foil, aluminum foil and diaphragm are directly recycled after dismantling;
[0056] S2 At a temperature of 45°C, add 100 g of the separated positive and negative electrode mixed powder into 1000 mL of 2M NaOH solution, and stir in the mixer at a stirring rate of 500 rpm for 1 hour to fully dissolve the positive and negative electrode mixed powder. Al element is recovered in the filtrate;
[0057] S3 At a temperature of 90°C, put the positive and negative electrode mixed powder filtered out in step S2 after removing Al into 800mL of 1M hydrochloric acid to r...
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