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Hong, Sung You
Synthetic Organic Chemistry Lab.
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Synergistic Effect of Partially Fluorinated Ether and Fluoroethylene Carbonate for High-Voltage Lithium-Ion Batteries with Rapid Chargeability and Dischargeability

Author(s)
Kim, Choon-KiKim, KoeunShin, KyominWoo, Jung-JeKim, SaheumHong, Sung YouChoi, Nam-Soon
Issued Date
2017-12
DOI
10.1021/acsami.7b12352
URI
https://scholarworks.unist.ac.kr/handle/201301/23035
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.7b12352
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.50, pp.44161 - 44172
Abstract
The roles of a partially fluorinated ether (PFE) based on a mixture of 1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane and 2-(difluoro(methoxy)methyl)-1,1,1,2,3,3,3-heptafluoropropane on the oxidative durability of an electrolyte under high voltage conditions, the rate capability of the graphite and 5 V-class LiNi0.4Mn1.6O4 (LNMO) electrodes, and the cycling performance of graphite/LNMO full cells are examined. Our findings indicate that the use of PFE as a co-solvent in the electrolyte yields thermally stable electrolytes with self-extinguishing ability. Furthermore, the PFE combined with fluoroethylene carbonate (FEC) effectively alleviates the oxidative decomposition of the electrolyte at the high-voltage LNMO cathode, allowing reversible electrochemical reactions at the graphite anodes and LNMO cathodes at high rates. In striking contrast to other electrolytes, the FEC-PFE electrolyte allows the rapid charging of high-density LNMO cathodes and graphite anodes at high rates. Moreover, the combination of PFE, which mitigates electrolyte decomposition at high voltages, and FEC, which stabilizes the anode-electrolyte interface, enables the reversible cycling of high-voltage full cells (graphite/LNMO) with a capacity retention of 70.3% and a high Coulombic efficiency of 99.7% after 100 cycles at 1C rate at 30 °C.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
partially fluorinated etherfluoroethylene carbonatesolid electrolyte interphase5 V-class spinel-type cathodelithium-ion battery
Keyword
METHYL NONAFLUOROBUTYL ETHERCYCLING PERFORMANCESAFE ELECTROLYTESRATE CAPABILITYLINI0.5MN1.5O4MIXTURESHYDROFLUOROETHERELECTRODESSOLVENTSPROGRESS

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