Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 18, Pages 5694-5700Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201204254
Keywords
absorption; electrochemistry; lithium storage; sulfur; tungsten
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Funding
- National 973 Program of China [2009CB220100]
- National 863 Program [2009AA033101]
- Open Foundation of Beijing Key Laboratory of Environment Science and Engineering
- China-Australia Sci-Tech Collaboration Foundation (NSFC) [51011120044]
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Graphene-like and platelike WS2 were obtained by solid-state reactions. High-resolution (HR) TEM, BET, and Raman scattering studies show that the graphene-like WS2 is a few-layer-structured material. It exhibits better electrochemical performances than the platelike WS2. Structural characterization indicates that metallic W and Li2S are the end products of discharge (0.01V versus Li+/Li), whereas metallic W and S are the recharge (3.00V) products. In addition, X-ray absorption near-edge structure (XANES) characterization shows that the d electrons of W deviate towards the Li (or S) atom during the discharge/charge process, thus forming a weak bond between W and Li2S (or S).
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