Abstract
Aqueous Zn//MnO2 batteries, leveraging the Mn2+/MnO2 conversion reaction, are gaining significant interest for their high redox potential and cost-effectiveness. However, they typically require a highly acidic environment to initiate this redox process. Herein, Glycine (Gly), a gentle and safe amino acid, is employed to enhance the effectiveness of depositing and dissolving Mn2+/MnO2. On one hand, Gly can complex with Mn2+, reducing its concentration and releasing H+. This not only promotes the dissolution of MnO2 but also increases the electrode potential. On the other hand, the Gly attaches to the Zn metal anode’s surface, shielding it from unwanted reactions. Hence, the assembled aqueous Zn//MnO2 battery exhibits an elevated output voltage during the discharge of 1.5 V with high coulombic efficiency (0.5 mAh cm−2 capacity), a long cycling life and excellent rate. This work showcases an efficient approach to enable the two-electron process of MnO2 cathode materials in aqueous zinc batteries.
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