MCMB/LiCoO_2电池的循环稳定性

Cycle stability of MCMB/LiCoO_2 battery

通过对AA型MCMB/LiCoO2电池及以MCMB为负极、LiCoO2为正极、金属锂为参比电极的AA型三电极电池的性能测试,结合XRD实验、双电极模拟电池的交流阻抗 电位实验,研究了MCMB/LiCoO2电池的循环稳定性及其容量衰减的原因。结果表明:在室温条件下,电池具有较好的循环稳定性和较高的放电电压平台。循环150次时,电池的容量仍为初始容量的98%,3 6V以上容量为总容量的82%。随着循环次数的增加,正极性能的恶化是导致电池容量衰减和放电电压平台降低的主要原因。

The AA-size MCMB/LiCoO_2 batteries and AA-size three-electrode batteries using LiCoO_2 as cathode,MCMB as anode and lithium metal as reference electrode, were assembled. By the performance measurements of batteries and the XRD expriment, two-electrode simulate battery impedance-potential measurement,the cyclic performance and the reason of capacity fading of MCMB/LiCoO_2 battery were investigated. The results showed that at room temperature, the battery had excellent cycle stability and high discharge voltage platform. After 150 cycled,the batterys capacity was 98% of the initial capacity, the capacity above (3.6?V) was 82% of the total capacity.With the increasing of cycle number, the performance deterioration of the LiCoO_2 cathode was the main reason of battery capacity fading and discharge voltage platform drop.