High Voltage LiNi0.5Mn0.3Co0.2O2/Graphite Cell Cycled at 4.6 V with a FEC/HFDEC-Based Electrolyte

He Meinan; Su Chi-Cheung; Feng Zhenxing; Zeng Li; Wu Tianpin; Bedzyk Michael J.; Fenter Paul; Wang Yan; Zhang Zhengcheng

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High Voltage LiNi0.5Mn0.3Co0.2O2/Graphite Cell Cycled at 4.6 V with a FEC/HFDEC-Based Electrolyte

机译：使用基于FEC / HFDEC的电解液在4.6 V下循环的高压LiNi0.5Mn0.3Co0.2O2 /石墨电池

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A high voltage LiNi0.5Mn0.3Co0.2O2/graphite cell with a fluorinated electrolyte formulation 1.0 m LiPF6 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.

机译：报道了一种氟化电解质配方为1.0 m的LiPF6氟碳酸亚乙酯/碳酸双（2,2,2-三氟乙基）碳酸酯的高压LiNi0.5Mn0.3Co0.2O2 /石墨电池，其电化学性能在4.6 V的电池电压下进行了评估。与非氟化电解质相比，所报道的氟化电解质在施加更高的截止电压（4.6 V）时显示出了更高的库仑效率和容量保持率。扫描电子显微镜/能量色散X射线光谱学和X射线光电子光谱学数据清楚地证明了新电解质的优异的氧化稳定性。通过在边缘结构附近的X射线吸收和X射线衍射，广泛研究了使用不同电解质循环的本体阴极材料的结构稳定性。

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来源
《Advanced energy materials》 |2017年第15期|1700109.1-1700109.9|共9页
作者
He Meinan; Su Chi-Cheung; Feng Zhenxing; Zeng Li; Wu Tianpin; Bedzyk Michael J.; Fenter Paul; Wang Yan; Zhang Zhengcheng;
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Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA|Worcester Polytech Inst, Dept Mech Engn, 100 Inst Rd, Worcester, MA 01609 USA;

Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA;

Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA;

Northwestern Univ, Appl Phys Program, Evanston, IL 60208 USA;

Argonne Natl Lab, Xray Sci Div, 9700 South Cass Ave, Argonne, IL 60439 USA;

Northwestern Univ, Appl Phys Program, Evanston, IL 60208 USA|Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA;

Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA;

Worcester Polytech Inst, Dept Mech Engn, 100 Inst Rd, Worcester, MA 01609 USA;

Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA;

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High Voltage LiNi0.5Mn0.3Co0.2O2/Graphite Cell Cycled at 4.6 V with a FEC/HFDEC-Based Electrolyte

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