Improved electrochemical performance of Zn–air secondary batteries via novel organic additives

In this study, we report the electrochemical and corrosion behaviors of Zn anodes in electrolytes (6.0 M KOH) with various additives, such as ethylenediaminetetraacetic acid (EDTA), polysorbate 20 (Tween 20), and tartaric acid. Data are given as Tafel plots, linear polarizations, cyclic voltammetry...

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Bibliographic Details
Published in:Journal of the Chinese Chemical Society (Taipei) 2018-10, Vol.65 (10), p.1239-1244
Main Authors: Huang, Mao‐Chia, Huang, Shih‐Hsuan, Chiu, Sheng‐Cheng, Hsueh, Kan‐Lin, Chang, Wen‐Sheng, Yang, Chang‐Chung, Wu, Ching‐Chen, Lin, Jing‐Chie
Format: Article
Language:English
Subjects:
Acids
Additives
Anodes
anticorrosion
Corrosion resistance
dendrite formation
Dendritic structure
Discharge
Electrochemical analysis
electrochemical behavior
Electrode polarization
Electrolytes
Ethylenediaminetetraacetic acids
Linear polarization
Metal air batteries
Morphology
Polyoxyethylene sorbitan monolaurate
Scanning electron microscopy
Storage batteries
Tartaric acid
Zinc-oxygen batteries
Zn–air secondary battery
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Summary:In this study, we report the electrochemical and corrosion behaviors of Zn anodes in electrolytes (6.0 M KOH) with various additives, such as ethylenediaminetetraacetic acid (EDTA), polysorbate 20 (Tween 20), and tartaric acid. Data are given as Tafel plots, linear polarizations, cyclic voltammetry measurements, and charge–discharge test results. After the 1000th cycle of charge–discharge measurements, the morphologies of the Zn anodes in electrolytes with various additives were examined by scanning electron microscopy (SEM). The results of linear polarization show that the corrosion resistance was in the order EDTA > Tween 20 > tartaric acid > blank. Based on the SEM images, the prevention of dendrite formation followed the order EDTA > Tween 20 = tartaric acid > blank. In this study, we report the electrochemical and corrosion behaviors of Zn anodes in electrolytes with various additives, such as ethylenediaminetetraacetic acid (EDTA), Tween 20, and tartaric acid. After the 1000th cycle of charge–discharge measurements, scanning electron microscopy (SEM) images revealed that the electrolyte with 0.1 wt% EDTA effectively prevented the formation of dendrites. In battery performance results, the voltage during charging and discharging fluctuated greatly for the blank, whereas the 0.1 wt% EDTA showed the best stability. Hence 0.1 wt% EDTA can be used in a Zn–air rechargeable battery and can replace existing primary mechanically rechargeable batteries because electrical recharging is easier than mechanical recharging.
ISSN:0009-4536
2192-6549
DOI:10.1002/jccs.201700445