Rechargeable aqueous zinc-manganese dioxide batteries with high energy and power densities.

ABSTRACT: Although alkaline zinc-manganese dioxide batteries have dominated the primary battery applications, it is challenging to make them rechargeable. Here we report a high-performance rechargeable zinc-manganese dioxide system with an aqueous mild-acidic zinc triflate electrolyte. We demonstrate that the tunnel structured manganese dioxide polymorphs undergo a phase transition to layered zinc-buserite on first discharging, thus allowing subsequent intercalation of zinc cations in the latter structure. Based on this electrode mechanism, we formulate an aqueous zinc/manganese triflate electrolyte that enables the formation of a protective porous manganese oxide layer. The cathode exhibits a high reversible capacity of 225 mAh g^-1 and long-term cyclability with 94% capacity retention ov

SUBMITTER: Zhang N 

PROVIDER: S-EPMC5581336 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature