Title
Nafion Ionomer-Based Single Component Electrolytes for Aqueous Zn/MnO2 Batteries with Long Cycle Life
Author
Ghosh, M.
Vijayakumar, V.
Anothumakkool, B.
Kurungot, S.
Publication year
2020
Abstract
Recently, aqueous rechargeable Zn/MnO2 batteries are emerging as promising energy storage aids owing to their improved safety, low cost of fabrication, and high energy density. However, the rapid decay of capacity during extended charge-discharge cycles hinders the prospect of this technology beyond lab-scale. In the conventional Zn/MnO2 cell, additives such as Mn2+ have been used to tackle the stability issue. Here, we demonstrate that cycling performance of the Zn/MnO2 cell can be improved substantially by using Nafion ionomer as the separator in combination with zinc-ion conducting electrolytes. The Nafion ionomer-based Zn/MnO2 cells do not require any Mn2+ additive in the electrolyte and hence termed as "single component" electrolytes. The postmortem study of the post-cycled electrodes reveals that the structural evolution of both the anode and cathode in various electrolytes (1 M Zn(CF3SO3)2, 1 M ZnSO4·7H2O, and 3 M ZnSO4·7H2O) during prolonged cycling significantly influences the cycle life of the respective cells. Optimizing the Nafion ionomer membrane with a suitable electrolyte could render the desired combination of high capacity and high cycle life for a Zn/MnO2 cell.
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TNO identifier
876262
Publisher
ACS
ISSN
2168-0485
Source
ACS Sustainable Chemistry and Engineering, 8 (13), 5040-5049
Document type
article