A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS) cathode material. The lithiation products of metallic Mo and LiS rather than Mo and LiS species have been detected. This process could yield a high discharge capacity of 746 mAh g. Characterizations of the recovered molybdenum polysulfide after the delithiaiton process manifests the high reversibility of the unique conversion reaction, in contrast with the general irreversibility of the conventional conversion-type mechanism. As a result, the a-MoS electrodes deliver high cycling stability with an energy-density retention of 1166 Wh kg after 100 cycles. These results provide a novel model for the design of high-capacity and long-life electrode materials.
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