New curly MnOx nanomembrane cathode for high-performance Li-O2 battery; improved stability
13 July 2015
Researchers at the Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden) have prepared new curly manganese oxide (MnOx) nanomembranes for use as cathode materials for rechargeable Li-air systems. The Li–O2 battery using such curly MnOx nanomembranes as the cathode delivers a specific discharge capacity of 4610 mAh gC−1 at a current density of 70 mA gC−1 which is higher than that of carbon black.
The MnOx nanomembrane electrode also exhibits improved stability, being capable of cycling 112 times at a current density of 200 mA gC−1. A paper on their work is published in the Journal of Power Sources.
IFW Dresden team first prepared two-dimensional MnOx nanomembranes by electron beam evaporation, then rolled these up into three--dimensional hybrid micro/nano-tubes by strain release.
The researchers ascribed the encouraging performance to the unique superiorities of nanomembranes and their inner oxygen vacancies. The team suggested that the results indicated that such nanomembranes are promising materials for Li–O2 batteries.
Resources
Xueyi Lu, Wenping Si, Xiaolei Sun, Junwen Deng, Lixia Xi, Bo Liu, Chenglin Yan, Oliver G. Schmidt (2015) “Curly MnOx nanomembranes as cathode materials for rechargeable lithium–oxygen battery systems,” Journal of Power Sources, Volume 295, Pages 197-202 doi: 10.1016/j.jpowsour.2015.07.018
Yongping Zheng, Kyeongse Song, Jaepyeong Jung, Chenzhe Li, Yoon-Uk Heo, Min-Sik Park, Maenghyo Cho, Yong-Mook Kang, and Kyeongjae Cho (2015) “Critical Descriptor for the Rational Design of Oxide-Based Catalysts in Rechargeable Li–O2 Batteries: Surface Oxygen Density” Chemistry of Materials 27 (9), 3243-3249 doi: 10.1021/acs.chemmater.5b00056
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