α-MnO_2 hollow clews for rechargeable Li-air batteries with improved cyclability  

作　　者：ZHANG LeiLei WANG ZhongLi XU Dan XU JiJing ZHANG XinBo WANG LiMin 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences Changchun 130022,China [2]Graduate University of Ch inese Academy of Seienees,Beijing 100049,China

出　　处：《Chinese Science Bulletin》2012年第32期4210-4214,共5页

基　　金：supported by the Program of One Hundred Talented People of the Chinese Academy of Sciences;the National Natural Science Foundation of China (21101147);the Jilin Science and Technology Development Program (20100102)

摘　　要：Lithium-air(Li-air) batteries have attracted worldwide attention due to their high energy density(11140 Wh kg-1) comparable to gasoline.In this work,we have synthesized the α-MnO2 hollow clews via a simple method and characterized them by X-ray diffraction and scanning electron microscope.Interestingly,cycle performance of Li-air batteries is improved greatly when using the α-MnO2 hollow clews as the catalyst.The first discharge capacity is 596 mAh g-1,and the charge capacity is 590 mAh g-1 at the current density of 0.1 mA cm-2 between 2.0 and 4.2 V using the Vulcan XC-72 as the carbon material.Additionally,by re-assembling new batteries with the used lithium foil,separators and cathode separately,we find that the cathode is the key role to end the Li-air battery life.Lithium-air （Li-air） batteries have attracted worldwide attention due to their high energy density （11140 Wh kg 1） comparable to gasoline. In this work, we have synthesized the α-MnO2 hollow clews via a simple method and characterized them by X-ray dif- fraction and scanning electron microscope. Interestingly, cycle performance of Li-air batteries is improved greatly when using the α-MnO2 hollow clews as the catalyst. The first discharge capacity is 596 mAh g -1, and the charge capacity is 590 mAh g t at the current density of 0.1 mA cm 2 between 2.0 and 4.2 V using the Vulcan XC-72 as the carbon material. Additionally, by re- assembling new batteries with the used lithium foil, separators and cathode separately, we find that the cathode is the key role to end the Li-air battery life.

关 键 词：空气电池 循环性能 二氧化锰 可充电 锂 空心 X-射线衍射 MNO2 

分 类 号：TM912[电气工程—电力电子与电力传动]