从废旧电池中回收二水磷酸铁再生LiFePO_(4)/C  

Recycling dihydrate iron phosphate from waste batteries and regenerating LiFePO_(4)/C

作　　者：陈显彪[1] 梁爽 代芳[1] 刘嘉[1] 刘伟昊 王帅[1] 彭望 曾杰 张文华 CHEN Xianbiao;LIANG Shuang;DAI Fang;LIU Jia;LIU Weihao;WANG Shuai;PENG Wang;ZENG Jie;ZHANG Wenhua(School of Electrical Engineering,Nanchang Institute of Technology,Nanchang 330099,China;Nanchang Power Supply Branch,Jiangxi Electric Power Company,Nanchang 330000,China)

机构地区：[1]南昌工程学院电气工程学院,江西南昌330099 [2]江西省电力公司南昌供电分公司,江西南昌330000

出　　处：《南昌工程学院学报》2024年第4期84-89,共6页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJJ211915,GJJ211913,GJJ190952);国家自然科学基金资助项目(22269014)。

摘　　要：使用酸浸—加热回流法从废旧磷酸铁锂电池中回收得到二水磷酸铁,将其作为原料并添加一定量的锂源和碳源,通过高温固相法再生了LiFePO_(4)/C,并研究了温度对再生LiFePO_(4)/C电化学性能的影响。首先采用酸浸—加热回流法对废旧磷酸铁锂正极片进行处理生成FePO_(4)·2H_(2)O,洗涤烘干后研磨得到FePO_(4)·2H_(2)O粉末,XRD表征和ICP测试结果显示回收得到的FePO_(4)·2H_(2)O结构完整、纯度较高。然后在FePO_(4)·2H_(2)O粉末中添加碳源,在高温下制备LiFePO_(4)/C材料,对其进行结构与形貌表征以及电化学测试,发现以葡萄糖为碳源、温度为700℃、葡萄糖量为理论生成磷酸铁锂质量的17%时再生的LiFePO_(4)/C电化学性能最佳,0.3 C倍率下再生的LiFePO_(4)/C首周放电比容量可达141.8 mAh/g,循环100周后容量保持率可维持在94.3%。通过与商用LiFePO_(4)/C进行电化学性能对比,进一步验证了该工艺再生的LiFePO_(4)/C有着优良的电化学性能。Dihydrate iron phosphate was recovered from waste lithium iron phosphate batteries using acid leaching heating reflux method.It was used as a raw material to regenerate LiFePO_(4)/C cathode material by adding a certain amount of lithium source and carbon source through high-temperature solid-phase method.The influence of temperature as the main influencing factor on the electrochemical performance of regenerated LiFePO_(4)/C was investigated.In the main process of recycling,the waste lithium iron phosphate cathode plate is first subjected to acid leaching heating reflux treatment to generate FePO_(4)·2H_(2)O.After washing and drying,FePO_(4)·2H_(2)O powder is obtained by grinding.XRD characterization and ICP testing results show that the recovered FePO_(4)·2H_(2)O has a complete structure and high purity.Then,FePO_(4)·2H_(2)O powder was used as the raw material and carbon source was added to prepare LiFePO_(4)/C material at high temperature.The structure and morphology of the material were characterized,and electrochemical tests were conducted.It was found that the LiFePO_(4)/C regenerated with glucose as the carbon source,temperature of 700℃,and glucose content as 17%of the theoretical lithium iron phosphate mass had the best electrochemical performance.At a rate of 0.3C,the first week discharge specific capacity can reach 141.8 mAh/g,and the capacity retention rate can be maintained at 94.3%after 100 cycles.By comparing the electrochemical performance with commercial LiFePO_(4)/C,it was further verified that the regenerated LiFePO_(4)/C produced by this process has excellent electrochemical performance.

关 键 词：废旧磷酸铁锂电池 FePO_(4)·2H_(2)O 高温固相法 再生LiFePO_(4)/C 

分 类 号：TM911[电气工程—电力电子与电力传动]