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Abnormal self-discharge in lithium-ion batteries

Cited 17 time in Web of Science Cited 22 time in Scopus
Authors
Seong, Won Mo; Park, Kyu-Young; Lee, Myeong Hwan; Moon, Sehwan; Oh, Kyungbae; Park, Hyeokjun; Lee, Sechan; Kang, Kisuk
Issue Date
2018-04
Citation
Energy and Environmental Sciences, Vol.11 No.4, pp.970-978
Abstract
Lithium-ion batteries are expected to serve as a key technology for large-scale energy storage systems (ESSs), which will help satisfy recent increasing demands for renewable energy utilization. Besides their promising electrochemical performance, the low self-discharge rate (<5% of the stored capacity over 1 month) of lithium-ion batteries is one of their most significant advantages for ESSs. Herein, contrary to conventional belief, we report that the self-discharge of LIBs can be abnormally accelerated when the battery has been exposed even to a routine short-term thermal exposure. We demonstrate that this thermal 'history' in addition to the temperature itself is memorized in the battery and accelerates the self-discharge rate. The series of characterizations performed in our work reveal that the electrolyte salt acts as a strong oxidizing agent by vigorously damaging the surface of the cathode, producing an internal 'parasitic' lithium source that continuously supplies lithium for the self-discharge. Although it is widely known that battery operation at elevated temperature generally induces faster degradation of capacity over multiple cycles, the key finding here is that not only the operation temperature but also the 'thermal history' of the battery should be carefully considered because this history remains and continues to affect the self-discharge rate afterwards. The self-discharge of LIBs has remained largely neglected; however, our findings suggest that close attention must be paid to the self-discharge of LIBs applied to large-scale ESSs, which, unlike mobile electronic devices, will be exposed to various outdoor temperature conditions.
ISSN
1754-5692
URI
http://hdl.handle.net/10371/164990
DOI
https://doi.org/10.1039/c8ee00186c
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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