Aqueous Rechargeable Manganese/Iodine Battery

Abstract Carbon neutralization has promoted the identification of new types of energy storage devices. Aqueous iodine batteries (AIBs) with reversible iodine redox activity are considered a viable candidate for stationary energy storage units and thus have recently drawn extensive research interest. Herein, we introduce an aqueous manganese iodine battery (AMIB), utilizing sodium iodide (NaI) as a redox‐active additive in the Mn(ClO 4 ) 2 (NMC) electrolyte, activated carbon (AC) as a redox host and Mn ions as the charge carrier. Taking advantage of enhanced kinetics facilitated by I 2 /2I − redox activity, our suggested AMIBs can be electrochemically charged/discharged with only a 6 % loss in capacity after 2,000 cycles at a low current density of 0.3 A g −1 in an AC||AC coin cell configuration. Moreover, the AC||Zn−Mn hybrid full‐cell configuration is also established with AC and a Zn−Mn anode involving the NMC electrolyte, which retains a high energy of 185 Wh kg −1 at a specific power of 2,600 W kg −1 . Overall, the AMIBs in this study preferred I 2 /I − conversion chemistry, yielding stable cycle stability, rate performance, and low capacity loss per cycle when compared to Manganese Ion Batteries (MIBs) which are based on Mn 2+ intercalation chemistry.