废旧LiFePO_(4)电池的再生制备和改性研究  

Recovery Preparation and Modification of Spent Lithium Iron Phosphate Battery

作　　者：雷嘉豪 向楷雄[1,2,3] 刘卫平 林文军 廖贻鹏[2,3] LEI Jiahao;XIANG Kaixiong;LIU Weiping;LIN Wenjun;LIAO Yipeng(College of Materials and Advanced Manufacturing,Hunan University of Technology,Zhuzhou Hunan 412007,China;Postdoctoral Workstation,Zhuzhou Smelter Group Co.,Ltd.;Postdoctoral Research Station of Metallurgical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南工业大学材料与先进制造学院,湖南株洲412007 [2]株洲冶炼集团博士后工作站 [3]中南大学冶金工程博士后科研流动站,湖南长沙410083

出　　处：《包装学报》2022年第6期90-96,共7页Packaging Journal

基　　金：湖南省自然科学基金资助项目(2020JJ6079);中国博士后科学基金资助项目(2021M693777)。

摘　　要：为了探索大规模工业回收再利用废弃LiFePO_(4)的方法,对LiFePO_(4)废粉添加碳源,直接还原焙烧合成再生LiFePO_(4)材料。利用XRD、SEM以及电化学测试等检测手段研究了不同碳源对LiFePO_(4)材料的结构、形貌以及电化学特性的影响。结果表明,LiFePO_(4)废粉中添加葡萄糖、PEG、石墨烯组合碳源还原焙烧合成的材料,在半电池中均表现出优良的性能,在0.1 C倍率下首次充放电比容量达到162.7 mA·h/g,且1 C倍率100次循环后容量保持率仍有95.53%。这种操作简单、制备方便、成本低的再生制备LiFePO_(4)方法,是实现废弃LiFePO_(4)大规模工业回收再利用的可行途径。In order to explore the method of large-scale industrial recycling and reuse of spent LiFePO_(4),regenerated LiFePO_(4)/C material was synthesized by reducing and roasting spent LiFePO_(4)powder with carbon source.Furthermore, the effects of different carbon contents on the structure、morphology and electrochemical performance of regenerated LiFePO_(4)materials were investigated simultaneously by XRD, SEM and electrochemical measurements.The results show that the materials synthesized by reduction roasting by adding glucose, PEG and graphene combined carbon source to spent lithium iron phosphate powder all exhibited excellent performance in half-cells. The regenerated LiFePO_(4)cathode material delivered a discharge capacity of 162.7 mA·h/g at 0.1 C rate, and the capacity retention rate remained to be 95.53% after 100 cycles at 1 C rate. This method of regenerating LiFePO_(4)with simple operation,convenient preparation and low cost is a viable way to realize large-scale industrial recycling of spent LiFePO_(4).

关 键 词：锂离子电池 磷酸铁锂 再生回收 正极材料 石墨烯 

分 类 号：TM912[电气工程—电力电子与电力传动]