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A novel structure of core-shell MnO 2 /S composite was designed as cathode materials for Li-S batteries. This structure could efficiently inhibit the polysulfide dissolution and improve the conductivity at the same time. As a result, the cycle performance of Li-S battery was greatly improved due to the presence of core-shell MnO 2 /S composite. The results show that the specific capacity of core-shell MnO 2 /S composite is 1200 mAh g -1 at 0.1 C. After 100 cycles, the specific capacity remainsdoi:10.20964/2018.12.09 fatcat:ym3gn4u6yjdytkgr5hylgqa4l4