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

Zulipiya Shadike, Yong-Ning Zhou, Lan-Li Chen, Qu Wu, Ji-Li Yue, Nian Zhang, Xiao-Qing Yang, Lin Gu, Xiao-Song Liu (), Si-Qi Shi () and Zheng-Wen Fu ()
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Zulipiya Shadike: Fudan University
Yong-Ning Zhou: Fudan University
Lan-Li Chen: Shanghai University
Qu Wu: Shanghai University
Ji-Li Yue: Fudan University
Nian Zhang: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science
Xiao-Qing Yang: Fudan University
Lin Gu: Institute of Physics, Chinese Academy of Sciences
Xiao-Song Liu: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science
Si-Qi Shi: Shanghai University
Zheng-Wen Fu: Fudan University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract 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 previous compounds involve a single cationic redox reaction or a cumulative cationic and anionic redox reaction. Here we report an anionic redox chemistry and structural stabilization of layered sodium chromium sulfide. It was discovered that the sulfur in sodium chromium sulfide is electrochemically active, undergoing oxidation/reduction 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. Our present work not only enriches the electrochemistry of layered intercalation compounds, but also extends the scope of investigation on high-capacity electrodes.

Date: 2017
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DOI: 10.1038/s41467-017-00677-3

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