Journal
SMALL
Volume 13, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701471
Keywords
anodes; composites; graphene; K-ion batteries; MoS2
Categories
Funding
- National Natural Science Foundation of China [51674202, 51402236, 51521061]
- Program of Introducing Talents of Discipline to Universities [B08040]
- Fundamental Research Funds for the Central Universities [G2016KY0307]
- Key R&D Program of Shaanxi [2017ZDCXL-GY-08-03]
- Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [Z2017094]
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Potassium has its unique advantages over lithium or sodium as a charge carrier in rechargeable batteries. However, progresses in K-ion battery (KIB) chemistry have so far been hindered by lacking suitable electrode materials to host the relatively large K+ ions compared to its Li+ and Na+ counterparts. Herein, molybdenum disulfide (MoS2) roses grown on reduced graphene oxide sheets (MoS2@rGO) are synthesized via a two-step solvothermal route. The as-synthesized MoS2@rGO composite, with expanded interlayer spacing of MoS2, chemically bonded between MoS2 and rGO, and a unique nano-architecture, displays the one of the best electrochemical performances to date as an anode material for nonaqueous KIBs. More importantly, a combined K+ storage mechanism of intercalation and conversion reaction is also revealed. The findings presented indicate the enormous potential of layered metal dichalcogenides as advanced electrode materials for high-performance KIBs and also provide new insights and understanding of K+ storage mechanism.
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