A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS 5.7 ) cathode material. The lithiation products of metallic Mo and Li 2 S 2 rather than Mo and Li 2 S species have been detected. This process could yield a high discharge capacity of 746 mAh g –1 . 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 5.7 electrodes deliver high cycling stability with an energy-density retention of 1166 Wh kg –1 after 100 cycles. These results provide a novel model for the design of high-capacity and long-life electrode materials.
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Wang et al. (2017) studied this question.
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