Structural Transformation and Cycling Improvement of Nanosized Flower-like γ‑MnO2 in a Sodium Battery

Structural Transformation and Cycling Improvement of Nanosized Flower-like γ‑MnO2 in a Sodium Battery

In this paper, we prepared nanostructured γ-MnO2 and used it as the cathode material in a sodium battery. X-ray diffraction (XRD), inductively coupled plasma spectroscopy (ICP), a first-principles calculation, and other tests were carried out to study the structural changes of γ-MnO2 during Na+ (de)...

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Veröffentlicht in:ACS applied energy materials 2019-07, Vol.2 (7), p.5050-5056
Hauptverfasser: Si, Huinan, Li, Lei, Hao, Weijian, Seidl, Lukas, Cheng, Xiaolu, Xu, Hanying, Jia, Guixiao, Schneider, Oliver, An, Shengli, Qiu, Xinping
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container_end_page 5056
container_issue 7
container_start_page 5050
container_title ACS applied energy materials
container_volume 2
creator Si, Huinan
Li, Lei
Hao, Weijian
Seidl, Lukas
Cheng, Xiaolu
Xu, Hanying
Jia, Guixiao
Schneider, Oliver
An, Shengli
Qiu, Xinping
description In this paper, we prepared nanostructured γ-MnO2 and used it as the cathode material in a sodium battery. X-ray diffraction (XRD), inductively coupled plasma spectroscopy (ICP), a first-principles calculation, and other tests were carried out to study the structural changes of γ-MnO2 during Na+ (de)­intercalation. A phase transformation of γ-MnO2 to NaMnO2 was found during the first discharge. However, the capacity decayed quickly in EC-based electrolytes due to the dissolution of Mn2+. By replacing the electrolyte with ionic liquid­(IL), Mn2+ dissolution can be effectively alleviated and the cycling of γ-MnO2 can be improved. The capacity is as high as ∼150 mAh/g after 100 cycles in the ionic liqiud.
doi_str_mv 10.1021/acsaem.9b00723
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