过渡金属氧化物用作锂空气电池催化剂

摘要

比较了MnO2、V2 O5、Sb2 O3及CeO2等4种不同过渡金属氧化物用作锂空气电池催化剂的催化效果；研究MnO2晶型对锂空气电池性能的影响。多孔纳米球Birnessite-type MnO2（Bir-MnO2）的催化性能最好。当电极中Bir-MnO2、Super P石墨和聚偏氟乙烯的质量比为1∶3∶1时，以0.05 mA/cm2的电流密度在2.0～4.5 V循环，制备的锂空气电池的放电比容量可达832.60 mAh/g，第5次循环的容量保持率高于52％。%The catalytic performance of 4 kinds of transition metal oxides such as MnO2 ,V2 O5 ,Sb2 O3 and CeO2 used as catalyst of lithium-air battery was compared;effect of crystal type of MnO2 to the performance of lithium-air battery was studied. Porous nano-spheres birnessite-type manganese dioxide(Bir-MnO2 )had the best catalytic performance. While the mass ratio of Bir-MnO2 ,Super P graphite and poly(vinylidene fluoride)in the electrode was 1∶3∶1 ,when cycled in 2.0~4.5 V with the current density of 0.05 mA/cm2 ,the specific discharge capacity of the prepared lithium-air battery could reach to 832.60 mAh/g,the capacity retention rate was higher than 52% in the 5th cycle.