Corresponding Author

Li-juan ZHANG(zhanglj1997@bjut.edu.cn)


The silver-titanium dioxide co-modified manganese dioxide (Ag-TiO2-MnO2) cathode material was prepared through high temperature solid state reaction. The microstructure, phase composition and electrochemical performance of the prepared samples were characterized by X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), X-ray photoelectron spectroscopy (XPS), Energy-dispersive X-ray spectroscopy (EDS), Cyclic voltammetry (CV), galvanostatic discharge and electrochemical impedance spectroscopy (EIS). Results showed that the unmodified and Ag-TiO2 modified MnO2 samples both exhibited β-MnO2 structurebut with different morphologies. The EDS mapping results revealed that Ag was uniformly dispersed on the surface of manganese dioxide, while Ti was relatively non-uniform in the Ag-TiO2-MnO2 sample. The modified samples were effective in improving specific discharge capacities. The specific discharge capacity increased from 75 mAh·g-1 to 115 mAh·g-1 at the rate of 1C. The stronger bond energy of Mn-O in the modified MnO2 could suppress the volume expansion during the discharge process, which can maintain the structural stability of the manganese dioxide material.

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line-height: 150%'>, mso-bidi-font-size: 10.5pt'>Manganese dioxide cathode material, Ag-TiO2, modification, electrochemical performance

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