In:
Angewandte Chemie, Wiley, Vol. 131, No. 44 ( 2019-10-28), p. 16057-16062
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 2 /[ZnI x (OH 2 ) 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 [ZnI x (OH 2 ) 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.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v131.44
DOI:
10.1002/ange.201909324
Language:
English
Publisher:
Wiley
Publication Date:
2019
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