DataVXACS Applied Energy MaterialsPaper
journal article·2019-07-22

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

Huinan Si, Lei Li, Weijian Hao, Lukas Seidl, Xiaolu Cheng, Hanying Xu, Guixiao Jia, Oliver Schneider, Shengli An, Xinping Qiu

ACS Applied Energy Materials· Volume 2· Issue 7
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Source abstract

Abstract

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.
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Research context

Energy storageNanomaterials

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China

School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China

Physik-Department, Technische Universität München, James-Franck Straße 1, 85748 Garching, Germany

Institut für Informatik VI, Electrochemical Research Group, and the Joint Research Institute for Advanced Power Sources for Electric Vehicles, Technische Universität München, Schleißheimerstraße 90a, 85748 Garching, Germany

Ordos Institute of Technology, Ordos, Inner Mongolia 017000, China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · China-US Electric Vehicle Project · Beijing Municipal Science and Technology Commission

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