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Title: Interfacial Effects on Lithium Superoxide Disproportionation in Li-O₂ Batteries

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1222095
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Letters, 15(2):1041-1046
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Zhai, Dengyun, Lau, Kah Chun, Wang, Hsien-Hau, Wen, Jianguo, Miller, Dean, Lu, Jun, Kang, Feiyu, Li, Baohua, Yang, Wenge, Gao, Jing, Indacochea, Ernesto, Curtiss, Larry A., and Amine, Khalil. Interfacial Effects on Lithium Superoxide Disproportionation in Li-O₂ Batteries. United States: N. p., 2015. Web. doi:10.1021/nl503943z.
Zhai, Dengyun, Lau, Kah Chun, Wang, Hsien-Hau, Wen, Jianguo, Miller, Dean, Lu, Jun, Kang, Feiyu, Li, Baohua, Yang, Wenge, Gao, Jing, Indacochea, Ernesto, Curtiss, Larry A., & Amine, Khalil. Interfacial Effects on Lithium Superoxide Disproportionation in Li-O₂ Batteries. United States. doi:10.1021/nl503943z.
Zhai, Dengyun, Lau, Kah Chun, Wang, Hsien-Hau, Wen, Jianguo, Miller, Dean, Lu, Jun, Kang, Feiyu, Li, Baohua, Yang, Wenge, Gao, Jing, Indacochea, Ernesto, Curtiss, Larry A., and Amine, Khalil. Wed . "Interfacial Effects on Lithium Superoxide Disproportionation in Li-O₂ Batteries". United States. doi:10.1021/nl503943z.
@article{osti_1222095,
title = {Interfacial Effects on Lithium Superoxide Disproportionation in Li-O₂ Batteries},
author = {Zhai, Dengyun and Lau, Kah Chun and Wang, Hsien-Hau and Wen, Jianguo and Miller, Dean and Lu, Jun and Kang, Feiyu and Li, Baohua and Yang, Wenge and Gao, Jing and Indacochea, Ernesto and Curtiss, Larry A. and Amine, Khalil},
abstractNote = {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.},
doi = {10.1021/nl503943z},
journal = {Nano Letters, 15(2):1041-1046},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 11 00:00:00 EST 2015},
month = {Wed Feb 11 00:00:00 EST 2015}
}