采用商品化的LiMn2O4和石墨作为正极材料制作锰酸锂动力电池,并利用XRD、SEM等分析手段表征了LiMn2O4原料。研究了不同面密度和导电剂含量对锰酸锂电池倍率性能的影响。研究发现,锰酸锂电池的倍率性能随着面密度的减小而改善,随着导电剂含量的增加先改善后变差。当正极面密度未2.5 g/dm2,导电剂含量为3%时电池的倍率性能最好。20 C放电容量为1 C的94.1%,1C充电5 C放电,100次循环后容量保持率为92%。

The power battery was manufactured with the commercial LiMn2O4 and graphite.Structure and morphology of the LiMn2O4 raw material were observed by XRD and SEM technique,respectively.The effects of bulk density and content of conductive agents of cathode on the performance of LiMn2O4 Li-ion battery were studied.The results showed that the rate performance of LiMn2O4 battery was improved with the bulk density diminishing.The rate performance of LiMn2O4 battery was improved and then worse with the increasing of the content of conductive agent.It was found that the discharge capacity at 20 C was 94.1% of that at 1 C rate when the area density was 2.5 g/dm2 and conductive was 3% wt.The capacity retention ratio was 92% when battery charged at 1 C and discharged at 5 C after 100 cycles.