回收锂离子电池磷酸铁锂材料的再生及电化学性能  

Regeneration and Electrochemical Performance of LiFePO4for Lithium Ion Battery

作　　者：赵莉[1] 胡玉叶[1] 汝茹彤 ZHAO Li;HU Yuye;RU Rutong(Key Laboratory of Building Structure of Anhui Higher Education Institutes,Anhui Xinhua University,Hefei 230088,China)

机构地区：[1]安徽省高等学校建筑结构重点实验室/安徽新华学院,安徽合肥230088

出　　处：《材料科学与工程学报》2023年第3期441-444,共4页Journal of Materials Science and Engineering

基　　金：安徽省高校自然科学研究重点资助项目(KJ2021A1172);建筑结构安徽省普通高校重点实验室校级重点资助项目(KLBSZD202008);国家级大学生创新创业训练计划资助项目(202212216013);省级大学生创新创业训练计划资助项目(AH202112216120);安徽省教学示范课资助项目(2020SJJXSFK1304)。

摘　　要：本研究讨论了回收磷酸铁锂电池中磷酸铁锂废料的再生;采用盐酸酸浸的方式获得氯化亚铁溶液和在氯化亚铁溶液中加入盐酸并用双氧水氧化得到氯化铁溶液;研究了磷酸铁锂在盐酸溶液中浸出过程的影响因素;探讨了物料比、浸出温度、浸出时间等参数,并得到最佳浸出工艺。研究表明:在盐酸过量1.2倍,80℃搅拌1.5h,铁被浸出完全;合成磷酸铁沉淀在高温下脱水后得到正磷酸铁;770℃N_(2)保护下烧结10h可制备出性能优异的磷酸铁锂材料,0.2C充电容量在163mAh·g^(-1),能够满足现在行业需求。The regeneration of lithium iron phosphate waste from lithium battery was discussed.Ferrous chloride solution was prepared by acid leaching with hydrochloric acid.Hydrochloric acid was added to ferrous chloride solution and oxidized with hydrogen peroxide to obtain ferric chloride solution.Various factors affecting the leaching process of lithium iron phosphate in hydrochloric acid solution were studied.The parameters such as different material ratio,leaching temperature and leaching time were discussed,and the best leaching process was thus obtained.The results show that iron is completely leached when hydrochloric acid is 1.2 times excessive and stirred at 80℃for 1.5 h.Iron orthophosphate was obtained after precipitation of synthetic iron phosphate and dehydration at high temperatures.Lithium iron phosphate material with excellent performance can be prepared by sintering under nitrogen protection at 770℃for 10 h.The charging capacity is 163 mAh·g-1 at 0.2C,which meets the needs of the industry.

关 键 词：回收磷酸铁锂 锂离子电池 再生利用 

分 类 号：X705[环境科学与工程—环境工程]