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Corresponding Author

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

Abstract

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.

Graphical Abstract

Keywords

Manganese dioxide cathode material, Ag-TiO2, modification, electrochemical performance

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2018-06-28

Online Available Date

2018-03-12

Revised Date

2018-02-04

Received Date

2017-12-07

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