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

作　　者：江洋 彭长宏 陈伟 周豪 马忠彬 李洪博 邱在容 张国鹏 周康根 JIANG Yang;PENG Changhong;CHEN Wei;ZHOU Hao;MA Zhongbin;LI Hongbo;QIU Zairong;ZHANG Guopeng;ZHOU Kanggen(School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China;Zhiliang New Material Co.,Ltd.,Nanning 530300,Guangxi,China)

机构地区：[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

出　　处：《化工学报》2024年第6期2353-2361,共9页CIESC Journal

基　　金：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)。

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FePO_(4)及Li_(2)CO_(3)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。This work aims to evaluate the efficiency of comprehensive recovery of battery-grade iron phosphate(FePO_(4))and lithium carbonate(Li_(2)CO_(3))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 FePO_(4) and Li_(2)CO_(3) 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 

分 类 号：X705[环境科学与工程—环境工程]