锂-氧气电池锰氧化物电催化剂研究(英文)  

MnO_x as Electrocatalyst for Lithium Oxygen Batteries

作　　者：付正浩[1] 张灯[1] 林秀婧[1] 黄桃[1] 余爱水[1] 

机构地区：[1]复旦大学化学系,上海市分子催化和功能材料重点实验室,新能源研究院,上海200433

出　　处：《复旦学报（自然科学版）》2012年第5期539-546,552,共9页Journal of Fudan University：Natural Science

基　　金：Project supported by the Pujiang Program of Shanghai City(07pj14019);Science & Technology Commission of Shanghai Municipality(08DZ2270500);Natural Science Foundation of China(20873032)

摘　　要：制备了一系列锰系氧化物的纳米棒,作为锂空气电池中的催化剂,对其放电容量和循环性能进行了测试.结果表明高比表面的催化剂有利于Li_2O_2的分解,使电池的循环性能大大的提高.以刺球型γ-MnO_2为催化剂的锂空气电池具有最高的可逆比容量,循环5圈后仍有2 350 mAh·g^(-1),相对整个电极的比容量为1 175 mAh·g^(-1),是常规锂电池的10倍.根据不同MnO_x催化剂所表现出的不同催化性能,提出了可能的催化剂失效机理.A series of manganese oxide nanorods are prepared as catalysts for lithium oxygen batteries. The dependence of discharge capacity and cycle performance on various manganese oxide catalysts is evaluated. It is found that high surface area of MnO2 catalyst can facilitate Li2O2 decomposition, so the cycling performance of the cell could be improved greatly. The clew-like γ-MnO2 catalyzed lithium oxygen cell is found with the highest reversible lithium storage capacity exceeding 2 350 mAh-g^-1 over 5 cycles even in a higher carbon loading condition, and specific capacity associated with the total mass of the cathode can be calculated as 1 175 mAh .g^-1 which is to be about ten times higher than that of the conventional lithium batteries. The performance of lithium oxygen batteries catalyzed by various MnOx is contrasted and catalyst failure mechanism is also discussed.

关 键 词：可逆锂氧气电池 纳米结构锰氧化物 催化剂失效 机理 

分 类 号：O646.54[理学—物理化学]