Recycling method of positive electrode material of lithium iron phosphate battery
A lithium iron phosphate battery and lithium iron phosphate technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve problems such as the performance degradation of positive electrode materials, and achieve the effects of reducing impedance, increasing capacity, and reducing energy consumption
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Embodiment 1
[0057] This embodiment is used to illustrate the recycling method of the lithium iron phosphate battery cathode material provided by the present invention, comprising the following steps:
[0058] Disassemble the waste lithium iron phosphate positive electrode waste obtained after dismantling the waste lithium iron phosphate battery, crush the lithium iron phosphate positive electrode waste into about 2cm*2cm positive electrode fragments, weigh 150g of lithium iron phosphate positive electrode fragments in a 500mL beaker , add 300mL of organic solvent N-methylpyrrolidone (NMP) into the beaker, place the beaker in an ultrasonic cleaner, heat it in a water bath to 80°C, and perform mechanical stirring for 2 hours at the same time, so that the positive electrode material and the current collector are completely separated and bonded Dissolve the solvent completely, then filter the positive electrode mixture in the beaker, remove the current collector, centrifuge the filtrate, wash ...
Embodiment 2
[0062] This embodiment is used to illustrate the recovery method of the lithium iron phosphate battery cathode material provided by the present invention, including most of the operating steps in Example 1, the difference being:
[0063] Lithium supplementation operation is:
[0064] Weigh 2.5g of the lithium iron phosphate intermediate material to be repaired and place it in a 50mL autoclave, add 30mL of lithium hydroxide solution with a concentration of 0.1mol / L and 0.75g of vitamin C to the autoclave, and then seal the autoclave The reaction kettle was heated to 200°C for 8 hours. After the reaction was completed and cooled to room temperature, the product was centrifuged, washed to remove the remaining lithium hydroxide, and dried to obtain the repaired lithium iron phosphate cathode material.
Embodiment 3
[0066] This embodiment is used to illustrate the recovery method of the lithium iron phosphate battery cathode material provided by the present invention, including most of the operating steps in Example 1, the difference being:
[0067] Lithium supplementation operation is:
[0068] Weigh 2.5g of the lithium iron phosphate positive electrode material to be repaired and place it in a 50mL ball mill tank with deionized water as the solvent, add 0.046g of lithium hydroxide to it, and add 38.19g zirconium balls, then airtight ball milling tank, ball milling under 250r / min for 4h, centrifuge the product after the reaction is completed, filter and dry, in N 2 In the atmosphere, calcined at 350° C. for 4 hours, and then calcined at 650° C. for 8 hours to obtain the repaired lithium iron phosphate positive electrode material.
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