Direct regeneration of cathode materials from spent lithium iron phosphate batteries using a solid phase sintering method
Direct regeneration of cathode materials from spent lithium iron phosphate batteries using a solid phase sintering method
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DOI：
10.1039/c6ra27210j
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, J. W.
中科院分区：
文献类型：
--
作者：
Song, X.;Hu, T.;Liu, J. W.
提出了一种用固相烧结法直接再生废旧LiFePO4电池正极材料的方法。首先拆解废电池使正负极板分离，然后在30℃、固液比1：20gml(-1)的最佳条件下，用DMAC有机溶剂浸泡正极材料和铝箔，分离正极材料和铝箔。对分离后的LiFePO4进行了X射线衍射和扫描电子显微镜分析，结果表明，LiFePO4中有一些杂质相组成和不规则的形貌，并有许多团聚现象。用新的LiFePO4以不同的比例掺杂，在适当的温度下再生。由再生LiFePO4制成的电池容量在0.1C放电条件下可达120 mA h g(-1)以上，特别是在700℃掺杂比为3：7的情况下，容量最高可达144 mA h g(-1)。600℃和700℃掺杂的再生LiFePO4制成的电池的倍率性能和循环性能一般好于800℃。
A direct regeneration of cathode materials from spent LiFePO4 batteries using a solid phase sintering method has been proposed in this article. The spent battery is firstly dismantled to separate the cathode and anode plate, and then the cathode plate is soaked in DMAC organic solvent to separate the cathode materials and Al foil at optimal conditions of 30 min at 30 degrees C and solid liquid ratio of 1 : 20 g ml(-1). XRD and SEM results of the spent LiFePO4 after separation show that there are some impurity phase components and irregular morphologies with many agglomerations. The spent materials are regenerated at appropriate temperatures with doping of new LiFePO4 at different ratios. Battery capacities from regenerated LiFePO4 can reach over 120 mA h g(-1) at 0.1C discharge conditions, especially with the highest value of 144 mA h g(-1) with a doping ratio of 3 : 7 at 700 degrees C. The rate capabilities and cycling performance of batteries made from regenerated LiFePO4 with doping at 600 degrees C and 700 degrees C are generally better than those at 800 degrees C. All the performances of batteries made from regenerated LiFePO4 with pure phase and uniform morphology can meet the basic requirements for reuse.