Aqueous all-manganese batteries

Abstract

A SeO2-additive electrolyte is developed to achieve a proof-of-concept aqueous all-manganese battery, which shows MnO2/Mn2+ reactions at the cathode and Mn/Mn2+ chemistries at the anode with a theoretical potential of 2.42 V.

An Energetic Aqueous Mn Metal Anode

“…Lastly, these typical issues faced by aqueous Mn metal anodes are intricately intertwined, leading to the primary problem of irreversibility in Mn metal deposition/​dissolution. Specifically, the deposition/​dissolution CE of an aqueous Mn metal anode under a high current is currently only up to 73%, significantly lower than the CE of other aqueous metal negative electrodes (greater than 99%). ,, …”

“…Moreover, the addition of trace organic or inorganic molecules may potentially promote the nucleation process of Mn metal deposition. 28,54,55 Thus, the electrolyte design for an aqueous Mn anode is a complex and comprehensive process that may require a combination of multiple methods to collectively enhance their overall electrochemical performance. Electrode Design.…”

“…This showcased the vast potential application of aqueous Mn metal batteries. By employing SeO 2 as an electrolyte additive, they demonstrated, through multiple characterization methods, α-Mn deposition assisted by α-MnSe as the nucleus. , They achieved a maximum 73% CE at high current density. Optical microscopy further evidenced reversible deposition/​dissolution of metallic Mn.…”

“…However, it is crucial to note that the design process involving the addition of various electrolyte additives to suppress HER should not affect the efficiency of Mn metal deposition/​dissolution. Moreover, the addition of trace organic or inorganic molecules may potentially promote the nucleation process of Mn metal deposition. ,, Thus, the electrolyte design for an aqueous Mn anode is a complex and comprehensive process that may require a combination of multiple methods to collectively enhance their overall electrochemical performance.…”

“…Copyright 2023 The Author(s), published by Oxford University Press under a Creative Commons CC-BY license. (c) Comparison of some typical aqueous Cu, Ni, Fe, Zn, and Mn anodes in terms of redox potential, specific capacity, and ionic radius. ,, …”