Synthesis and Characterization of 2 × 4 Tunnel Structured Manganese Dioxides as Cathodes in Rechargeable Li, Na, and Mg Batteries

Sodium containing 2 × 4 (0.46nm × 0.92nm) tunnel structured manganese dioxide (Na-2 × 4-MnO2) nanofibers are hydrothermally synthesized. The nanofibrous Na-2 × 4-MnO2 was thoroughly characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), inductively coupled plasma optical emis...

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Veröffentlicht in:Journal of the Electrochemical Society 2019, Vol.166 (4), p.A670-A678
Hauptverfasser: Poyraz, Altug S., Quilty, Calvin D., Housel, Lisa M., Hu, Xiaobing, Bruck, Andrea M., Li, Yue Ru, Yin, Jiefu, Zhang, Bingjie, Huang, Jianping, Wu, Lijun, Zhu, Yimei, Takeuchi, Esther S., Marschilok, Amy C., Takeuchi, Kenneth J.
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Sprache:eng
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Zusammenfassung:Sodium containing 2 × 4 (0.46nm × 0.92nm) tunnel structured manganese dioxide (Na-2 × 4-MnO2) nanofibers are hydrothermally synthesized. The nanofibrous Na-2 × 4-MnO2 was thoroughly characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), inductively coupled plasma optical emission spectroscopy (ICP-OES), N2 sorption, and electron microscopy (SEM and TEM) and is assigned a formula of Na0.25MnO2.0.16H2O. The electrochemistry of Na-2 × 4-MnO2 in non-aqueous Li, Na and Mg batteries is compared for the first time and first cycle delivered capacities were found to be 152mAh/g, 86mAh/g, and 307mAh/g, respectively. Characterization of the active material after electrochemical tests demonstrated that Na-2 × 4-MnO2 preserved both its crystallographic structure and nanofibrous morphology after cycling in Na and Li cells, however, Na-2 × 4-MnO2 lost its crystalline structure after cycling in a Mg based system.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1341902jes