电解质
法拉第效率
X射线光电子能谱
电化学
阴极
材料科学
石墨
分析化学(期刊)
扫描电子显微镜
化学工程
电极
化学
物理化学
有机化学
工程类
复合材料
作者
Meinan He,Chicheung Su,Zhenxing Feng,Li Zeng,Tianpin Wu,Michael J. Bedzyk,Paul Fenter,Yan Wang,Zhengcheng Zhang
标识
DOI:10.1002/aenm.201700109
摘要
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.
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