%0 Journal Article
%A Montiel Guerrero, Saul Said
%A Durmus, Yasin Emre
%A Dzieciol, Krzysztof
%A Basak, Shibabrata
%A Tempel, Hermann
%A Waasen, Stefan
%A Kungl, Hans
%A Eichel, Rüdiger-A.
%T Improved Electrochemical Performance of Zinc Anodes by EDTA in Near‐Neutral Zinc−Air Batteries
%J Batteries & supercaps
%V 4
%N 12
%@ 2566-6223
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-03715
%P 1830-1842
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000681759200001
%R 10.1002/batt.202100116
%U https://juser.fz-juelich.de/record/897253