alpha-MnO2 hollow clews for rechargeable Li-air batteries with improved cyclability

作者：Zhang LeiLei; Wang ZhongLi; Xu Dan; Xu JiJing; Zhang XinBo^*; Wang LiMin

来源：Chinese Science Bulletin, 2012, 57(32): 4210-4214.

DOI：10.1007/s11434-012-5013-6

• Li-air battery
• alpha-MnO2
• catalyst
• cyclability

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 alpha-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 alpha-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.

• 出版日期2012-11
• 单位中国科学院; 中国科学院长春应用化学研究所; 稀土资源利用国家重点实验室