Enhanced Cycling Performance of Rechargeable Zinc–Air Flow Batteries Using Potassium Persulfate as Electrolyte Additive

International Journal of Molecular Sciences

Abhishek Lahiri¹  Ramin Khezri²  Soraya Hosseini²  Soorathep Kheawhom²  ShivaRezaei Motlagh³  MaiThanh Nguyen⁴  Tetsu Yonezawa⁴ 

[1] Department of Chemical Engineering, Brunel University London, London UB8 3PH, UK;Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;Department of chemical engineering, faculty of engineering, Universiti Putra Malaysia, Selangor 43300, Malaysia;Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Hokkaido 060-8628, Japan;

关键词: zinc–air batteries;    sulfur-containing additive;    electrolyte additive;    cycling performances;    electrochemical characterization;   

DOI  :  10.3390/ijms21197303

来源: DOAJ

【 摘 要 】

Zinc–air batteries (ZABs) offer high specific energy and low-cost production. However, rechargeable ZABs suffer from a limited cycle life. This paper reports that potassium persulfate (KPS) additive in an alkaline electrolyte can effectively enhance the performance and electrochemical characteristics of rechargeable zinc–air flow batteries (ZAFBs). Introducing redox additives into electrolytes is an effective approach to promote battery performance. With the addition of 450 ppm KPS, remarkable improvement in anodic currents corresponding to zinc (Zn) dissolution and limited passivation of the Zn surface is observed, thus indicating its strong effect on the redox reaction of Zn. Besides, the addition of 450 ppm KPS reduces the corrosion rate of Zn, enhances surface reactions and decreases the solution resistance. However, excess KPS (900 and 1350 ppm) has a negative effect on rechargeable ZAFBs, which leads to a shorter cycle life and poor cyclability. The rechargeable ZAFB, using 450 ppm KPS, exhibits a highly stable charge/discharge voltage for 800 cycles. Overall, KPS demonstrates great promise for the enhancement of the charge/discharge performance of rechargeable ZABs.

【 授权许可】

Unknown