Pilot study on comprehensive recycling of waste lithium iron phosphate powder
This work aims to evaluate the efficiency of comprehensive recovery of battery-grade iron phosphate(FePO4)and lithium carbonate(Li2 CO3)from spent lithium iron phosphate cathode powder(LFP/C)with high fluorine/aluminum content following high-temperature calcination-neutralization precipitation.A pilot-scale platform with an annual processing capacity of 500 tons was established.The investigation includes process stability,product performance characterization,preliminary economic assessment,and the reutilization of secondary slag.The results demonstrate that over 85.63%aluminum removal and 94.70%titanium removal can be achieved through this process,with the Fe/Al mass ratio in the purified liquid increasing from 203 to 1077,laying a foundation for comprehensive recycling of spent LFP/C.The prepared FePO4 and Li2 CO3 met the standards for battery-grade materials.The regenerated LFP/C cathode material exhibits a first-cycle coulombic efficiency of 95.2%at 0.1 C,and a capacity retention of 97.1%after 250 cycles at 1 C,indicating its favorable electrochemical performance.In addition,the economic evaluation further highlights the superiority of the process in terms of economic and environmental benefits.
国家科技期刊平台
NSTL
万方数据
