In this study, the electrochemical and transport properties (e.g., reversible Zn deposition behavior, Coulombic efficiency, anodic stability, ionic conductivity and diffusion coefficient) of a variety of non-aqueous Zn electrolytes have been examined in detail.7 Classical molecular dynamics and DFT calculations have been utilized to complement the experimental work and to provide insights into the molecular-level solvation structure and dynamics of the bulk electrolytes and a prediction of the electrochemical stability window.7 Based upon the experimental analysis and the simulation studies of the range of different electrolytes, we have selected promising electrolytes and instituted electrochemically testing with a cell consisting of a Zn metal anode and a variety of cathodes materials. Among them, the Zn metal cell consisting of an acetonitrile-Zn(TFSI)2 electrolyte and a synthesized nanostructured bilayered-hydrated V2O510 demonstrates good reversibility and stability for 120 cycles with nearly 100% coulombic efficiency and ~180 mAhg-1 of gravimetric capacity, albeit operating at a relatively low cell voltage of 0.9 V. On the other hand, λ-MnO2 (spinel) host material represents no intercalation behavior even in all selected electrolytes, while nanostructured and low crystalline α-, γ-, and δ-MnO2(tunnel or layer) show possible intercalation behavior.
Acknowledgments
This work was supported as part of the Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences. The submitted abstract has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract no. DE-AC02-06CH11357.
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