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Title: Antisite occupation induced single anionic redox chemistry and structural stabilization of layered sodium chromium sulfide

The intercalation compounds with various electrochemically active or inactive elements in the layered structure have been the subject of increasing interest due to their high capacities, good reversibility, simple structures and ease of synthesis. However, their reversible intercalation/deintercalation redox chemistries in all previous compounds involve a single cationic redox reaction or a cumulative cationic and anionic redox reaction. Here we report an anionic redox only chemistry and structural stabilization of layered sodium chromium sulfide. It is discovered that sulfur in sodium chromium sulfide is electrochemical active undergoing oxidation/reduction of sulfur rather than chromium. Significantly, sodium ions can successfully move out and into without changing its lattice parameter c, which is explained in terms of the occurrence of chromium/sodium vacancy antisite during desodiation and sodiation processes. Here, our present work not only enriches the electrochemistry of layered intercalation compounds, but also extends the scope of investigation on high-capacity electrodes.
 [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [4] ;  [4] ;  [4] ;  [3] ;  [2]
  1. Fudan Univ., Shanghai (People's Republic of China); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Fudan Univ., Shanghai (People's Republic of China)
  3. Shanghai Univ., Shanghai (People's Republic of China)
  4. Chinese Academy of Sciences, Beijing (People's Republic of China)
Publication Date:
Report Number(s):
Journal ID: ISSN 2041-1723; R&D Project: MA453MAEA; VT1201000
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
25 ENERGY STORAGE; National Synchrotron Light Source
OSTI Identifier: