Fig. 2
From: Rechargeable aqueous zinc-manganese dioxide batteries with high energy and power densities
Electrochemical and structural evolution of β-MnO2 in Zn-MnO2 cell. a Cyclic voltammograms of β-MnO2 electrode at a scan rate of 0.1 mV s−1 from 0.8 to 1.9 V. b Typical charge/discharge curves for the initial two cycles at 0.32 C in 3 M Zn(CF3SO3)2 aqueous electrolyte. The points A–J marked the states where data were collected for XRD analysis. c XRD patterns of β-MnO2 electrode at selected states during the first and second cycles
