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Operando Identification of the Chemical and Structural Origin of Li-Ion Battery Aging at Near-Ambient Temperature

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Authors
Kim, Min-Seob; Lee, Byoung-Hoon; Park, Jae-Hyuk; Lee, Hyeon Seok; Antink, Wytse Hooch; Jung, Euiyeon; Kim, Jiheon; Yoo, Tae Yong; Lee, Chan Woo; Ahn, Chi-Yeong; Kang, Seok Mun; Bok, Jinsol; Ko, Wonjae; Wang, Xiao; Cho, Sung-Pyo; Yu, Seung-Ho; Hyeon, Taeghwan; Sung, Yung-Eun
Issue Date
2020-08
Citation
Journal of the American Chemical Society, Vol.142 No.31, pp.13406-13414
Abstract
Integrated with heat-generating devices, a Li-ion battery (LIB) often operates at 20-40 degrees C higher than the ordinary working temperature. Although macroscopic investigation of the thermal contribution has shown a significant reduction in the LIB performance, the molecular level structural and chemical origin of battery aging in a mild thermal environment has not been elucidated. On the basis of the combined experiments of the electrochemical measurements, Cs-corrected electron microscopy, and in situ analyses, we herein provide operando structural and chemical insights on how a mild thermal environment affects the overall battery performance using anatase TiO2 as a model intercalation compound. Interestingly, a mild thermal condition induces excess lithium intercalation even at near-ambient temperature (45 degrees C), which does not occur at the ordinary working temperature. The anomalous intercalation enables excess lithium storage in the first few cycles but exerts severe intracrystal stress, consequently cracking the crystal that leads to battery aging. Importantly, this mild thermal effect is accumulated upon cycling, resulting in irreversible capacity loss even after the thermal condition is removed. Battery aging at a high working temperature is universal in nearly all intercalation compounds, and therefore, it is significant to understand how the thermal condition contributes to battery aging for designing intercalation compounds for advanced battery electrode materials.
ISSN
0002-7863
URI
https://hdl.handle.net/10371/171758
DOI
https://doi.org/10.1021/jacs.0c02203
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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