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Journal Article
Effect of the Dielectric Constant of a Liquid Electrolyte on Lithium Metal Anodes
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- Authors
- Ju Young Kim, Dong Ok Shin, Taeyong Chang, Kwang Man Kim, Jiseon Jeong, Joonam Park, Yong Min Lee, Kuk Young Cho, Charudatta Phatak, Seungbum Hong, Young-Gi Lee
- Issue Date
- 2019-03
- Citation
- Electrochimica Acta, v.300, pp.299-305
- ISSN
- 0013-4686
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- 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 ?닋1 ) and the low electrochemical potential of lithium (?닋3.04 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.
- KSP Keywords
- Carbonate content, Dielectric Constant, Electrochemical potential, Electrolyte system, Gravimetric energy density, Hydrogen electrode, Liquid electrolyte, Lithium plating, Long-term use, Solid electrolyte interphase, anode materials