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Effect of the dielectric constant of a liquid electrolyte on lithium metal anodes

Title
Effect of the dielectric constant of a liquid electrolyte on lithium metal anodes
Authors
Kim, Ju YoungShin, Dong OkChang, TaeyongKim, Kwang ManJeong, JiseonPark, JoonamLee, Yong MinCho, Kuk YoungPhatak, CharudattaHong, SeungbumLee, Young-Gi
DGIST Authors
Lee, Yong Min
Issue Date
2019-03
Citation
Electrochimica Acta, 300, 299-305
Type
Article
Article Type
Article
Author Keywords
Lithium metal secondary batteriesLithium metal anodeElectrolyteDielectric constant
Keywords
POLYMER ELECTROLYTECURRENT COLLECTORDENDRITE GROWTHION BATTERIESDEPOSITIONMECHANISMSCHEMISTRYBEHAVIORSAFE
ISSN
0013-4686
Abstract
Lithium metal is considered one of the most promising anode materials for realizing high volumetric and gravimetric energy density, owing to the high specific capacity (∼3860 mAh g −1 ) and the low electrochemical potential of lithium (−3.04 V vs. the standard hydrogen electrode). However, undesirable dendritic lithium growth and corresponding instability of the solid electrolyte interphase prevent safe and long-term use of lithium metal anodes. This paper presents a simple electrolyte approach to enhance the performance of lithium metal batteries by tuning the dielectric constant of the liquid electrolyte. Electrolyte formulations are designed by changing the concentration of ethylene carbonate to have various dielectric constants. This study confirms that high ethylene carbonate content in a liquid electrolyte enhances the cycling performance of lithium metal batteries because the electric field intensity applied to the electrolyte is reduced in relation to the polarization of the electrolyte and thus allows smooth lithium plating and formation of a stable solid electrolyte interphase. We believe that this approach provides an important concept for electrolyte system design suitable to lithium metal batteries. © 2019 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/9599
DOI
10.1016/j.electacta.2019.01.113
Publisher
Pergamon Press Ltd.
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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