期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 44, 页码 15910-15915出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909324
关键词
aqueous batteries; dual-plating batteries; iodine batteries; water-in-salt electrolyte; zinc batteries
资金
- NSF [CBET-1551693, CHE-1455353]
Plating battery electrodes typically deliver higher specific capacity values than insertion or conversion electrodes because the ion charge carriers represent the sole electrode active mass, and a host electrode is unnecessary. However, reversible plating electrodes are rare for electronically insulating nonmetals. Now, a highly reversible iodine plating cathode is presented that operates on the redox couples of I-2/[ZnIx(OH2)(4-x)](2-x) in a water-in-salt electrolyte. The iodine plating cathode with the theoretical capacity of 211 mAh g(-1) plates on carbon fiber paper as the current collector, delivering a large areal capacity of 4 mAh cm(-2). Tunable femtosecond stimulated Raman spectroscopy coupled with DFT calculations elucidate a series of [ZnIx(OH2)(4-x)](2-x) superhalide ions serving as iodide vehicles in the electrolyte, which eliminates most free iodide ions, thus preventing the consequent dissolution of the cathode-plated iodine as triiodides.
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