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A bifunctional auxiliary electrode for safe lithium metal batteries

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Authors
Moon, Sehwan; Tamwattana, Orapa; Park, Hyeokjun; Yoon, Gabin; Seong, Won Mo; Lee, Myeong Hwan; Park, Kyu-Young; Meethong, Nonglak; Kang, Kisuk
Issue Date
2019-11
Citation
Journal of Materials Chemistry A, Vol.7 No.43, pp.24807-24813
Abstract
Increasing demands for performance beyond the limit of current lithium ion batteries for higher energy densities have rejuvenated research using lithium metal as an anode. However, commercial implementation has still been hampered due to safety issues. Herein, we introduce a lithium rechargeable battery system with an auxiliary electrode that can detect the potential signs of an internal short-circuit and simultaneously prevent cell failure by inhibiting further dendritic growth of lithium metal. Based on this working principle, we provide guidelines for an auxiliary electrode design and demonstrate that it can act as both a safety sensor and a lithium scavenger. Finally, we show that our in-house designed cell, using a flexible and self-standing auxiliary electrode, can effectively alert the danger of a short circuit in real-time without additional dendrite growth. We expect that this finding will open up unexplored opportunities utilizing various auxiliary electrode chemistries for safe rechargeable lithium metal batteries.
ISSN
2050-7488
URI
http://hdl.handle.net/10371/164966
DOI
https://doi.org/10.1039/c9ta08032e
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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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