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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
Author
조국영
Keywords
Lithium metal secondary batteries; Lithium metal anode; Electrolyte; Dielectric constant
Issue Date
2019-03
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v. 300, Page. 299-305
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 (similar to 3860 mAh g(-1)) and the low electro-chemical 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. (C) 2019 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0013468619301306https://repository.hanyang.ac.kr/handle/20.500.11754/112532
ISSN
0013-4686; 1873-3859
DOI
10.1016/j.electacta.2019.01.113
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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