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홍성유

Hong, Sung You
Synthetic Organic Chemistry Lab.
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Exploiting chemically and electrochemically reactive phosphite derivatives for high-voltage spinel LiNi0.5Mn1.5O4 cathodes

Author(s)
Song, Young-MinKim, Choon-KiKim, Ko-EunHong, Sung YouChoi, Nam-Soon
Issued Date
2016-01
DOI
10.1016/j.jpowsour.2015.10.043
URI
https://scholarworks.unist.ac.kr/handle/201301/17695
Fulltext
http://www.sciencedirect.com/science/article/pii/S0378775315304316
Citation
JOURNAL OF POWER SOURCES, v.302, pp.22 - 23
Abstract
A family of organophosphorus compounds including triphenyl phosphite (TPP), trimethyl phosphite (TMP), tris(2,2,2-trifluoroethyl) phosphite (TFEP), and tris(trimethylsilyl) phosphite (TMSP) is investigated as additives for the stabilization of high-voltage LiNi0.5Mn1.5O4 (LNMO) cathode-electrolyte interface. Our investigation reveals that the cycling performance of Li/LNMO half cells with the TMP, TFEP or TMSP additive is drastically improved at 60°C compared to the baseline electrolyte. Among the various phosphite-based additives tested, TMSP additive enables facile Li ion transport at high C rates and significantly enhances the storage performance of the Li/LNMO cells at 60°C. To understand the effects of the phosphite-based additives on electrolyte oxidative decomposition at high voltages, the surface chemistry of the cathode after precycling is investigated via ex-situ X-ray photoelectron spectroscopy (XPS). Additionally, the roles of phosphite-based additives to suppress LiPF6 hydrolysis and to remove HF are examined via 19F and 31P NMR spectroscopies.
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753
Keyword (Author)
Electrolyte additiveLithium nickel manganese oxide cathodeLithium-ion batteryPhosphite derivativesSolid electrolyte interphase
Keyword
SULFONE-BASED ELECTROLYTESION BATTERYFLUORINATED ELECTROLYTESLITHIUM BATTERIESPERFORMANCESURFACEFILMTRIS(TRIMETHYLSILYL)PHOSPHATEELECTRODESADDITIVES

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