Stabilization of Lithium-Metal Batteries Based on the in Situ Formation of a Stable Solid Electrolyte Interphase Layer

Title
Stabilization of Lithium-Metal Batteries Based on the in Situ Formation of a Stable Solid Electrolyte Interphase Layer
Authors
정훈기박성진황장연윤종승선양국
Keywords
Li-metal battery; high-energy density; NCM 622; fluoroethylene carbonate; LiF-rich SEI layer
Issue Date
2018-05
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 10, NO 21-17993
Abstract
Lithium (Li) metals have been considered most promising candidates as an anode to increase the energy density of Li-ion batteries because of their ultrahigh specific capacity (3860 mA h g(-1)) and lowest redox potential (-3.040 V vs standard hydrogen electrode). However, unstable dendritic electrodeposition, low Coulombic efficiency, and infinite volume changes severely hinder their practical uses. Herein, we report that ethyl methyl carbonate (EMC)- and fluoroethylene carbonate (FEC)-based electrolytes significantly enhance the energy density and cycling stability of Li-metal batteries (LMBs). In LMBs, using commercialized Ni-rich Li[Ni0.6Co0.2Mn0.2]O-2 (NCM622) and 1 M LiPF6 in EMC/FEC = 3:1 electrolyte exhibits a high initial capacity of 1.8 mA h cm(-2) with superior cycling stability and high Coulombic efficiency above 99.8% for 500 cycles while delivering a unprecedented energy density. The present work also highlights a significant improvement in scaled-up pouch-type Li/NCM622 cells. Moreover, the postmortem characterization of the cycled cathodes, separators, and Li-metal anodes collected from the pouch-type Li/NCM622 cells helped identifying the improvement or degradation mechanisms behind the observed electrochemical cycling.
URI
http://pubs.kist.re.kr/handle/201004/67866
ISSN
1944-8244
Appears in Collections:
KIST Publication > Article
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