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
江洋 1彭长宏 1陈伟 1周豪 1马忠彬 2李洪博 2邱在容 1张国鹏 1周康根1
作者信息
- 1. 中南大学冶金与环境学院,湖南 长沙 410083
- 2. 智亮新材料股份有限公司,广西 南宁 530300
- 折叠
摘要
为研究废旧磷酸铁锂粉料(LFP/C)经高温煅烧-中和沉淀除杂后实现电池级磷酸铁和碳酸锂综合回收的效能,以氟/铝含量较高的废旧LFP/C为对象,构建了年处理规模为500 t的中试平台,从工艺稳定性、产品性能表征、初步经济评估及二次废渣再利用等角度进行研究.结果显示,通过此法可实现高于85.63%铝去除和94.70%钛去除,除铝液中铁铝质量比由203增加至1077,为废旧LFP/C综合回收奠定基础.所制备的FePO4及Li2CO3符合电池级标准,再生的LFP/C正极材料在0.1 C条件下首次充放电库仑效率可达95.2%,1 C条件下经过250圈循环后容量保持率达97.1%,展现出较好的电化学性能.此外,经济评估进一步凸显了该工艺在经济和环境效益方面的优越性.
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引用本文复制引用
基金项目
广西重点研发计划项目(桂科AB23026051)
中南大学研究生自主探索创新项目(2024ZZTS0433)
出版年
2024
国家科技期刊平台
NSTL
万方数据