期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 11, 页码 3521-3526出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201813698
关键词
commercial MoS2; high rate; layered crystalline structure; lithiation depth; lithium ion batteries
资金
- Singapore MOE Tier 2, Singapore National Research Foundation [MOE2015-T2-1-110]
MoS2 holds great promise as high-rate electrode for lithium-ion batteries since its large interlayer can allow fast lithium diffusion in 3.0-1.0 V. However, the low theoretical capacity (167 mAh g(-1)) limits its wide application. Here, by fine tuning the lithiation depth of MoS2, we demonstrate that its parent layered structure can be preserved with expanded interlayers while cycling in 3.0-0.6 V. The deeper lithiation and maintained crystalline structure endows commercially micrometer-sized MoS2 with a capacity of 232 mAh g(-1) at 0.05 A g(-1) and circa 92 % capacity retention after 1000 cycles at 1.0 A g(-1). Moreover, the enlarged interlayers enable MoS2 to release a capacity of 165 mAh g(-1) at 5.0 A g(-1), which is double the capacity obtained under 3.0-1.0 V at the same rate. Our strategy of controlling the lithiation depth of MoS2 to avoid fracture ushers in new possibilities to enhance the lithium storage of layered transition-metal dichalcogenides.
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