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.
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)