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조재필

Cho, Jaephil
Nano Energy Storage Material Lab.
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Mechanisms for electrochemical performance enhancement by the salt-type electrolyte additive, lithium difluoro(oxalato)borate, in high-voltage lithium-ion batteries

Author(s)
Cha, JihoHan, Jung-GuHwang, JaeseongCho, JaephilChoi, Nam-Soon
Issued Date
2017-07
DOI
10.1016/j.jpowsour.2017.04.094
URI
https://scholarworks.unist.ac.kr/handle/201301/22282
Fulltext
http://www.sciencedirect.com/science/article/pii/S0378775317305979
Citation
JOURNAL OF POWER SOURCES, v.357, pp.97 - 106
Abstract
Lithium difluoro(oxalato) borate (LiDFOB) with one oxalate moiety bonded to a central boron core was employed as a salt-type additive to enhance the interfacial stabilities of high-voltage Li-rich cathodes and graphite anodes. Our investigation revealed that the LiDFOB additive modified the surface film on the electrodes and effectively restrained degradation of the cycling performance of the electrodes. Investigation of the surface chemistries of the electrodes confirmed that LiDFOB produces a LiF-less surface film on the Li-rich cathode and a LiF-rich surface film on the graphite anode. Moreover, the use of 1% LiDFOB drastically improved the rate capabilities of Li-rich cathodes and graphite anodes. Within 100 cycles at a rate of C/2 at 25 degrees C, only 45.8% of the initial discharge capacity of a high-voltage Li-rich/graphite full cell was delivered in the baseline electrolyte, while the LiDFOB-containing electrolyte retained 82.7%.
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753
Keyword (Author)
Lithium-ion batteryLiPF6-based electrolyteGraphite anodesLi-rich cathodesLithium difluoro(oxalato)borateSolid electrolyte interphase
Keyword
RICH COMPOSITE CATHODELAYERED OXIDE CATHODECYCLING STABILITYENERGY DENSITYPHOSPHITEFADEFILMTETRAFLUOROOXALATOPHOSPHATELI1.2MN0.54NI0.13CO0.13O2CAPABILITY

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