TY  - JOUR
AU  - Montiel Guerrero, Saul Said
AU  - Durmus, Yasin Emre
AU  - Dzieciol, Krzysztof
AU  - Basak, Shibabrata
AU  - Tempel, Hermann
AU  - Waasen, Stefan
AU  - Kungl, Hans
AU  - Eichel, Rüdiger-A.
TI  - Improved Electrochemical Performance of Zinc Anodes by EDTA in Near‐Neutral Zinc−Air Batteries
JO  - Batteries & supercaps
VL  - 4
IS  - 12
SN  - 2566-6223
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-03715
SP  - 1830-1842
PY  - 2021
AB  - The influence of ethylenediaminetetraacetic acid (EDTA) electrolyte additive on the performance of Zn−air batteries with near-neutral chloride-based electrolytes was examined for primary and secondary batteries. The electrochemical measurements indicated that Zn is not completely active in neat 2 M NaCl, but still could be discharged up to 1 mA cm−2 around −1.0 VAg/AgCl. The characterization of the Zn surfaces revealed the existence of a passive film consisting of Simonkolleite, Zn(OH)2, and/or ZnO. The EDTA additive enhanced the discharge voltages by 200 mV to −1.2 VAg/AgCl indicating an active Zn surface. The effect of EDTA is explained by its chelation abilities with Zn2+ before formation of hydroxide or oxide species. The Zn−air cells with EDTA were operated up to 930 h with specific energies up to 840 Wh kgZn−1. The cells could also be cycled up to 70 cycles while providing enhanced discharge voltages at 1.15 V over 50 cycles. The positive effect of EDTA is dependent on the amount of free EDTA molecules. Nevertheless, the Zn−air cells showed better performance in terms of higher discharge voltage, discharge energies, and lower overpotentials in presence of EDTA.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000681759200001
DO  - DOI:10.1002/batt.202100116
UR  - https://juser.fz-juelich.de/record/897253
ER  -