Quasi-solid-state zinc-ion battery based on alpha-MnO2 cathode with husk-like morphology

Abstract

Zinc-ion batteries (ZIBs) are very promising energy storage devices owing to their safety, environmental friendliness, and low-costs. Nevertheless, their development has been mostly focused on aqueous-based systems. We fabricated a quasi-solid-state ZIB based on alpha-MnO2 nanohusk morphology synthesized using a one-step hydrothermal method and gel electrolyte. The fabricated quasi-solid-state ZIB exhibited a high initial discharge capacity of 321 mA h g(-1) at a current density of 33 mA g(-1) and considerable cyclability. We systematically investigated its electrochemical properties utilizing various characterization methods such as cyclic voltammetry and galvanostatic intermittent titration technique. In addition, in-situ synchrotron X-ray diffraction and X-ray absorption spectroscopy were used to elucidate the phase transformation of the cathode in the quasi- solid-state ZIB upon electrochemical cycling. This study may provide further insight into electrochemical behaviour of the quasi-solid-state ZIB based on the alpha-MnO2 nanohusk morphology and gel electrolyte as a promising energy storage device.