Journal Article

FZJ-2021-03715

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Improved Electrochemical Performance of Zinc Anodes by EDTA in Near‐Neutral Zinc−Air Batteries

Montiel Guerrero, S. S.FZJ* ; Durmus, Y. E. (Corresponding author)FZJ* ; Dzieciol, K.FZJ* ; Basak, S.FZJ* ; Tempel, H.FZJ* ; Waasen, S.FZJ* ; Kungl, H.FZJ* ; Eichel, R.-A.FZJ*RWTH*

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/29492  doi:10.1002/batt.202100116

Abstract: 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.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)
2. Zentralinstitut für Elektronik (ZEA-2)

Research Program(s):

1. 1223 - Batteries in Application (POF4-122) (POF4-122)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; Science Citation Index Expanded ; Web of Science Core Collection

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