AI Article Synopsis
- Plating battery electrodes can achieve higher capacity compared to other types because they don't need a host material; the active mass consists entirely of ion charge carriers.
- A new reversible iodine plating cathode is introduced, which utilizes the redox couple of I / [ZnI(OH)] in a concentrated water-based electrolyte, achieving a theoretical capacity of 211 mAh/g and a notable areal capacity of 4 mAh/cm² when plated on carbon fiber paper.
- Advanced techniques like femtosecond stimulated Raman spectroscopy and DFT calculations reveal the presence of superhalide ions in the electrolyte that facilitate iodide delivery, minimizing free iodide ions to prevent the dissolution of plated iodine as triiodides.
Article Abstract
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 /[ZnI (OH ) ] in a water-in-salt electrolyte. The iodine plating cathode with the theoretical capacity of 211 mAh g plates on carbon fiber paper as the current collector, delivering a large areal capacity of 4 mAh cm . Tunable femtosecond stimulated Raman spectroscopy coupled with DFT calculations elucidate a series of [ZnI (OH ) ] 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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| http://dx.doi.org/10.1002/anie.201909324 | DOI Listing |
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