Zinc‐ion batteries (ZIBs) are emerging as attractive energy storage systems due to their inherent safety, environmental friendliness, low cost, high specific capacity, and nonflammability, which are enabled by aqueous electrolytes. Zn‐ion charge storage systems have been widely investigated with various cathode materials. However, the choice of electrolyte is very scant. Therefore, in recent times, investigations on electrolytes for Zn‐ion storage have increased. In this article, Zn||MnO 2 cells have been investigated using zinc trifluoromethanesulfonate (Zn(OTf) 2 mixed with manganese sulfate (MnSO 4 ) electrolyte; Zn(OTf) 2 incorporated with MnSO 4 electrolytes were optimized with a focus on developing highly conductive, stable aqueous liquid electrolytes for enhanced Zn‐ion storage. The incorporation of manganese sulfate (MnSO 4 ) as an additive significantly improved electrochemical performance by stabilizing the cathode and promoting Zn 2+ transport. The cell using 1 M Zn(OTf) 2 alone delivered a specific capacity of 157.8 mAh g −1 , while the addition of MnSO 4 increased the capacity to 237.25 mAh g −1 . These results demonstrate that MnSO 4 acts as an effective additive, improving the cell's capacity, redox reversibility, and overall cycling stability. It is noted that the cell fabricated with the additive electrolyte improved performance and cycling stability, achieving up to 1300 cycles with 99% coulombic efficiency. Thus, the newly obtained electrolyte will be a promising alternative for Zn‐ion cell applications.
Rajan et al. (Mon,) studied this question.