化工学报2024，Vol.75Issue(6)：2353-2361,9.DOI:10.11949/0438-1157.20240004
废旧磷酸铁锂粉料综合回收中试研究
Pilot study on comprehensive recycling of waste lithium iron phosphate powder
摘要
Abstract
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.关键词
废旧磷酸铁锂/前体/电化学性能/中试规模/经济分析Key words
spent LiFePO4/C/precursors/electrochemical performance/pilot-scale/economic analysis分类
资源环境引用本文复制引用
江洋,彭长宏,陈伟,周豪,马忠彬,李洪博,邱在容,张国鹏,周康根..废旧磷酸铁锂粉料综合回收中试研究[J].化工学报,2024,75(6):2353-2361,9.基金项目
广西重点研发计划项目(桂科AB23026051) （桂科AB23026051）
中南大学研究生自主探索创新项目(2024ZZTS0433) （2024ZZTS0433）
