TY  - CONF
AU  - Durmus, Yasin Emre
AU  - Montiel Guerrero, Saul Said
AU  - Dzieciol, Krzysztof
AU  - Kungl, Hans
AU  - Tempel, Hermann
AU  - Eichel, Rüdiger-A.
TI  - Improved Electrochemical Performance of Zinc Anodes by Electrolyte Additives in Near-Neu-tral Zinc-Air Batteries
M1  - FZJ-2024-00291
PY  - 2023
AB  - Metal-air batteries are considered up-and-coming electrochemical energy storage technolo-gies due to possessing very high theoretical energy densities while utilizing cost-effective, safe, and abundant materials. Among various possible configurations, zinc-based metal-air batteries are one of the most advanced for primary and secondary applications. Although primary Zinc-air batteries (ZABs) have been commercially available for various applications, secondary bat-teries have faced challenges, especially in alkaline media. In this regard, employing aqueous neutral electrolytes brings several advantages, such as suppressed carbonization of the elec-trolyte and dendrite formation. However, the performance of such ZABs with neutral electro-lytes can be hindered by the passivation of the zinc surface, the formation of insoluble zinc species, and corrosion.The objective of the present work is to evaluate the influence of Ethylenediaminetetraacetic acid (EDTA) electrolyte additive on the performance of near-neutral secondary Zn-air batteries. The electrochemical behaviour of Zn electrodes was investigated in 2M NaCl (pH 10) solutions with and without EDTA additive. Initially, open-circuit and potentiodynamic polarization exper-iments were conducted to extract the corrosion parameters of the Zn electrodes. The interme-diate-term (24 h) discharge experiments were performed under current densities of 0.1, 0.25, 0.5, and 1 mA/cm2 in a three-electrode half-cell setup. These electrochemical measurements confirmed that Zn is only partially active in neat 2M NaCl electrolytes. However, it could still be discharged up to 1 mA/cm2 at discharge potentials around −1.0 VAg/AgCl. In order to study the dissolution behaviour and the discharge products, the surface of the electrodes was further characterized by a laser scanning microscope (LSM), X-ray diffraction (XRD), and scanning electron microscope (SEM) upon discharge experiments. The performance of full-cell Zn-air batteries was then evaluated in galvanostatic discharge experiments (in primary-mode) up to 930 h with specific energies up to 840 Wh/kgZn and in galvanostatic cycling experiments (in secondary mode) up to 575 h with 70 cycles. In comparison to neat electrolytes, the addition of EDTA to the electrolyte results in enhanced specific energies and mass utilization efficien-cies of near-neutral zinc-air batteries.
T2  - 3RD INTERNATIONAL ZINC-AIR AND OTHER ZINC BATTERIES WORKSHOP
CY  - 18 Sep 2023 - 19 Sep 2023, Ulm (Germany)
Y2  - 18 Sep 2023 - 19 Sep 2023
M2  - Ulm, Germany
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/1020596
ER  -