钴酸锂的再生及其电化学性能

Recovery of LiCoO_2 and its electrochemical performance

采用提取的含少量Co3O4的LiCoO2为原料,在不同温度下合成正极材料LiCoO2,烧结时间为12 h,并采用XRD和SEM技术研究合成的LiCoO2的晶相结构与微观形貌。结果发现:烧结温度对LiCoO2的晶体结构影响较大,烧结温度越高,LiCoO2的层状结构发育越完整。循环伏安曲线很好地反映了再生LiCoO2的脱/嵌锂行为。将LiCoO2样品做成电池进行电化学检测,结果发现,烧结温度为850℃的样品首次放电容量为151mA.h/g,30次循环之后,放电容量仍有141mA.h/g,表现出良好的电化学性能。

LiCoO2 was synthesized at different temperatures from recycled power containing little CO3O4, and the calcinating time was 12 h. The structure and morphology of resulted samples were observed by XRD and SEM, respectively. The results show that the calcinating temperature has great significant on the structure of LiCoO2. The layered structure of LiCoO2 is improved when the calcinating temperature increases. The cyclic voltammagrams curve shows the exaction/insertion performance of LiCoO2 well. The initial discharge capacity of LiCoO2 calcined at 850 ℃ is 151 mA·h/g. The discharge capacity after cycled 30 times is still 141 mA·h/g.