Fluoroethylene Carbonate as an Important Component in Electrolyte Solutions for High-Voltage Lithium Batteries: Role of Surface Chemistry on the Cathode

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• 作者：Elena Markevich ; Gregory Salitra ; Katia Fridman ; Ronit Sharabi ; Gregory Gershinsky ; Arnd Garsuch ; Guenter Semrau ; Michael A. Schmidt ; Doron Aurbach
• 刊名：Langmuir
• 出版年：2014
• 出版时间：July 1, 2014
• 年：2014
• 卷：30
• 期：25
• 页码：7414-7424
• 全文大小：653K
• ISSN：1520-5827

文摘

The effect of fluorinated ethylene carbonate (FEC) as a cosolvent in alkyl carbonates/LiPF₆ on the cycling performance of high-voltage (5 V) cathodes for Li-ion batteries was investigated using electrochemical tools, X-ray photoelectron spectroscopy (XPS), and high-resolution scanning electron microscopy (HRSEM). An excellent cycling stability of LiCoPO₄/Li, LiNi_0.5Mn_1.5O₄/Si, and LiCoPO₄/Si cells and a reasonable cycling of LiCoPO₄/Si cells was achieved by replacing the commonly used cosolvent ethylene carbonate (EC) by FEC in electrolyte solutions for high-voltage Li-ion batteries. The roles of FEC in the improvement of the cycling performance of high-voltage Li-ion cells and of surface chemistry on the cathode are discussed.