Reaction mechanisms for electrolytic manganese dioxide in rechargeable aqueous zinc-ion batteries.

ABSTRACT: This study reports the phase transformation behaviour associated with electrolytic manganese dioxide (EMD) utilized as the positive electrode active material for aqueous zinc-ion batteries. Electrochemical techniques, including galvanostatic charge-discharge and rotating ring-disk electrode measurements, and microstructural techniques, using X-ray powder diffraction, scanning electron microscopy, and transmission/scanning transmission electron microscopy, were utilized to characterize the positive electrode at different stages of discharge and charge of zinc-ion cells. The results indicate that, during discharge, a fraction of EMD undergoes a transformation to ZnMn₂O₄ (spinel-type) and Zn²⁺ is intercalated into the tunnels of the γ- and ε-MnO₂ ph

SUBMITTER: Tran TNT 

PROVIDER: S-EPMC8531032 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature