Lithium-air (Li-air) batteries have attracted worldwide attention due to their high energy density (1114 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 59 mAh g−1 at the current density of .1 mA cm−2 between 2. and 4.2 V using the Vulcan XC-72 as the carbon material. Additionally, by reassembling 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.
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