Abstract
An urchin-like hollow Al-doped α-MnO2−x microsphere is prepared by a facile hydrothermal method and exhibited effective regulation for the dissolution of polysulfides from the Li-S cathode. After Al doping, the conductivity of MnO2 has been greatly improved, and made the traditional MnO2 morphology changed. These Al-doped α-MnO2−x/S microspheres are found to exhibit high initial discharge capacity of 1017 mAh g−1 under sulfur content up to 73 wt% at 1 C and they exhibit a favorable cycle stability of 694 mAh g−1 at 3 C after 300 cycles. These excellent characteristics make this composite a promising cathode material for Li-S batteries.
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