Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 51, Pages 16703-16707Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201810579
Keywords
heterostructure; lithium-sulfur batteries; sulfur host materials; two-dimensional materials
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Funding
- Australian Research Council (ARC) [DP160104866, LP160100927, FL170100154]
- Chinese CSC Scholarship Program
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Lithium-sulfur batteries hold promise for next-generation batteries. A problem, however, is rapid capacity fading. Moreover, atomic-level understanding of the chemical interaction between sulfur host and polysulfides is poorly elucidated from a theoretical perspective. Here, a two-dimensional (2D) heterostructured MoN-VN is fabricated and investigated as a new model sulfur host. Theoretical calculations indicate that electronic structure of MoN can be tailored by incorporation of V. This leads to enhanced polysulfides adsorption. Additionally, in situ synchrotron X-ray diffraction and electrochemical measurements reveal effective regulation and utilization of the polysulfides in the MoN-VN. The MoN-VN-based lithium-sulfur batteries have a capacity of 708 mAhg(-1) at 2 C and a capacity decay as low as 0.068% per cycle during 500 cycles with sulfur loading of 3.0 mgcm(-2).
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