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New Insight into the Reaction Mechanism for Exceptional Capacity of Ordered Mesoporous SnO2 Electrodes via Synchrotron-Based X-ray Analysis

Cited 108 time in Web of Science Cited 116 time in Scopus
Authors

Kim, Hyunchul; Park, Gwi Ok; Kim, Yunok; Muhammad, Shoaib; Yoo, Jaeseung; Balasubramanian, Mahalingam; Cho, Yong-Hun; Kim, Min-Gyu; Lee, Byungju; Kang, Kisuk; Kim, Hansu; Kim, Ji Man; Yoon, Won-Sub

Issue Date
2014-11
Publisher
American Chemical Society
Citation
Chemistry of Materials, Vol.26 No.22, pp.6361-6370
Abstract
Tin oxide-based materials, operating via irreversible conversion and reversible alloying reaction, are promising lithium storage materials due to their higher capacity. Recent studies reported that nanostructured SnO2 anode provides higher capacity beyond theoretical capacity based on the alloying reaction mechanism; however, their exact mechanism remains still unclear. Here, we report the detailed lithium storage mechanism of an ordered mesoporous SnO2 electrode material. Synchrotron X-ray diffraction and absorption spectroscopy reveal that some portion of Li2O decomposes upon delithiation and the resulting oxygen reacts with Sn to form the SnOx phase along with dealloying of LixSn, which are the main reasons for unexpected high capacity of an ordered mesoporous SnO2 material. This finding will not only be helpful in a more complete understanding of the reaction mechanism of Sn-based oxide anode materials but also will offer valuable guidance for developing new anode materials with abnormal high capacity for next generation rechargeable batteries.
ISSN
0897-4756
URI
https://hdl.handle.net/10371/165109
DOI
https://doi.org/10.1021/cm5025603
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