An experiment was conducted on selective extraction of lithium by co-pyrolysis of spent NCM cathode powder and polypropylene followed by water leaching,and the obtained pyrolysis products were characterized.In the experiment,co-pyrolysis of NCM cathode powder with 40％polypropylene ran at 550 ℃ for 2 h,with argon flow rate at 200 mL/min,and then the obtained pyrolysis product was subjected to water leaching,resulting in the lithium leaching rate of 87.92％.It is found that lithium loss is mainly attributed to the formation of water-insoluble lithium cobalt oxide during co-pyrolysis.
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