A Dual Plating Battery with the Iodine/[ZnI x (OH 2 ) 4− x ] 2− x Cathode

Autor:	Xiulei Ji, Longteng Tang, Heng Jiang, Bei Jin, Trenton C. Gallagher, Liangdong Zhu, Cheng Chen, Chong Fang, Qiubo Guo, Jessica J. Hong
Rok vydání:	2019
Předmět:	Battery (electricity) chemistry.chemical_classification Materials science 010405 organic chemistry Inorganic chemistry Iodide General Chemistry Electrolyte General Medicine Current collector 010402 general chemistry 01 natural sciences Catalysis Cathode 0104 chemical sciences law.invention Ion chemistry law Plating Electrode
Zdroj:	Angewandte Chemie. 131:16057-16062
ISSN:	1521-3757 0044-8249
DOI:	10.1002/ange.201909324
Popis:	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 I2 /[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.
Databáze:	OpenAIRE
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