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

Journal Article · Tue Nov 25 00:00:00 EST 2014 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm5025603· OSTI ID:1241380

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, WonSub

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

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1241380
• Journal Information: Chemistry of Materials, Vol. 26, Issue 22; ISSN 0897-4756
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English