期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 44, 页码 38606-38611出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12709
关键词
a-MoS5.7; reversible conversion reaction; Li2S2; high capacity; high energy density
资金
- National Natural Science Foundation of China [21622407, 21673008]
- National Key Research and Development Program of China [2016YFB0700604]
- Guangdong Innovative and Entrepreneurial Research Team Progress [2013N080]
A unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS5.7) cathode material. The lithiation products of metallic Mo and Li2S2 rather than Mo and Li2S 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-MoS5.7 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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