为了研究非金属元素包覆和金属元素掺杂对LiFePO_4的电化学性能和振实密度的影响,用固相反应法制备了炭包覆的LiFePO_4/C和铜掺杂的LiFe_(0.95)Cu_(0.05)PO_4正极材料,并对所制材料进行了XRD、SEM、充放电循环、倍率性能和振实密度的测试.结果显示:LiFePO_4/C和LiFe_(0.95)Cu_(0.05)PO_4的循环平均容量分别达到147mAh/g和131mAh/g;在高倍率放电时,LiFe_(0.95)Cu_(0.05)PO_4的容量衰减远大于LiFePO_4/C.LiFePO_4/C材料的各项电化学性能都优于LiFe_(0.95)Cu_(0.05)PO_4材料,而LiFe_(0.95)Cu_(0.05)PO_4材料的振实密度远大于LiFePO_4/C材料的振实密度,前者是后者的1.5倍.
The effects of a carbon coating and copper doping on the electrochemical performance and tap density of a LiFePO_4 cathode for lithium ion batteries were investigated by XRD, SEM, charge/discharge cycle tests, rate tests and tap density tests. Results showed that the average discharge capacity of LiFePO_4/C and LiFe_(0.95)Cu_(0.05)PO_4 were 147 mAh/g and 131 mAh/g respectively. The capacity fading rate of LiFe_(0.95)Cu_(0.05)PO_4 was much larger than that of LiFePO_4/C in a high-rate discharging test. The electrochemical performance of LiFePO_4/C was better than that of LiFe_(0.95)Cu_(0.05)PO_4, but the tap density of the latter was 1.5 times as large as that of the former.
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