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High Voltage LiNi 0.5 Mn 0.3 Co 0.2 O 2 /Graphite Cell Cycled at 4.6 V with a FEC/HFDEC‐Based Electrolyte
Author(s) -
He Meinan,
Su ChiCheung,
Feng Zhenxing,
Zeng Li,
Wu Tianpin,
Bedzyk Michael J.,
Fenter Paul,
Wang Yan,
Zhang Zhengcheng
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700109
Subject(s) - faraday efficiency , electrolyte , materials science , x ray photoelectron spectroscopy , electrochemistry , cathode , graphite , analytical chemistry (journal) , scanning electron microscope , absorption (acoustics) , chemical engineering , electrode , chemistry , organic chemistry , engineering , composite material
A high voltage LiNi 0.5 Mn 0.3 Co 0.2 O 2 /graphite cell with a fluorinated electrolyte formulation 1.0 m LiPF 6 fluoroethylene carbonate/bis(2,2,2‐trifluoroethyl) carbonate is reported and its electrochemical performance is evaluated at cell voltage of 4.6 V. Comparing with its nonfluorinated electrolyte counterpart, the reported fluorinated one shows much improved Coulombic efficiency and capacity retention when a higher cut‐off voltage (4.6 V) is applied. Scanning electron microscopy/energy dispersive X‐ray spectroscopy and X‐ray photoelectron spectroscopy data clearly demonstrate the superior oxidative stability of the new electrolyte. The structural stability of the bulk cathode materials cycled with different electrolytes is extensively studied by X‐ray absorption near edge structure and X‐ray diffraction.