Interfacial Effects on Lithium Superoxide Disproportionation in Li-O2 Batteries

During the cycling of Li-O2 batteries the discharge process gives rise to dynamically evolving agglomerates composed of lithium–oxygen nanostructures; however, little is known about their composition. In this paper, we present results for a Li-O2 battery based on an activated carbon cathode that ind...

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Published in:Nano letters 2015-02, Vol.15 (2), p.1041-1046
Main Authors: Zhai, Dengyun, Lau, Kah Chun, Wang, Hsien-Hau, Wen, Jianguo, Miller, Dean J, Lu, Jun, Kang, Feiyu, Li, Baohua, Yang, Wenge, Gao, Jing, Indacochea, Ernesto, Curtiss, Larry A, Amine, Khalil
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container_issue 2
container_start_page 1041
container_title Nano letters
container_volume 15
creator Zhai, Dengyun
Lau, Kah Chun
Wang, Hsien-Hau
Wen, Jianguo
Miller, Dean J
Lu, Jun
Kang, Feiyu
Li, Baohua
Yang, Wenge
Gao, Jing
Indacochea, Ernesto
Curtiss, Larry A
Amine, Khalil
description During the cycling of Li-O2 batteries the discharge process gives rise to dynamically evolving agglomerates composed of lithium–oxygen nanostructures; however, little is known about their composition. In this paper, we present results for a Li-O2 battery based on an activated carbon cathode that indicate interfacial effects can suppress disproportionation of a LiO2 component in the discharge product. High-intensity X-ray diffraction and transmission electron microscopy measurements are first used to show that there is a LiO2 component along with Li2O2 in the discharge product. The stability of the discharge product was then probed by investigating the dependence of the charge potential and Raman intensity of the superoxide peak with time. The results indicate that the LiO2 component can be stable for possibly up to days when an electrolyte is left on the surface of the discharged cathode. Density functional calculations on amorphous LiO2 reveal that the disproportionation process will be slower at an electrolyte/LiO2 interface compared to a vacuum/LiO2 interface. The combined experimental and theoretical results provide new insight into how interfacial effects can stabilize LiO2 and suggest that these interfacial effects may play an important role in the charge and discharge chemistries of a Li–O2 battery.
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title Interfacial Effects on Lithium Superoxide Disproportionation in Li-O2 Batteries
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