Effect of vinyl acetate plus vinylene carbonate and vinyl ethylene carbonate plus biphenyl as electrolyte additives on the electrochemical performance of Li-ion batteries

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• 作者：Eun-Gi Shim ; Tae-Heum Nam ; Jung-Gu Kim ; Hyun-Soo Kim ; Seong-In Moon
• 关键词：Electrolyte additives ; Vinyl acetate ; Vinylene carbonate ; Vinyl ethylene carbonate ; Biphenyl
• 刊名：Electrochimica Acta
• 出版年：2007
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 December 2007
• 卷：53
• 期：2
• 页码：650-656
• 文件大小：1264 K

摘要

For application to Li-ion batteries, we studied the electrochemical behavior and thermal stability of the following two combinations of binary electrolyte additives in a triphenylphosphate (TPP)-containing ionic electrolyte: vinyl acetate (VA) plus vinylene carbonate (VC), and vinyl ethylene carbonate (VEC) plus biphenyl (BP). Mesocarbon microbeads (MCMB) and LiCoO₂ were used as the anode and cathode materials, respectively. Cyclic voltammetry (CV), differential scanning calorimetry (DSC), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) were used for the analyses. These results confirmed the capability of the VEC + BP electrolyte additive to improve the cell performance and electrolyte thermal stability in TPP-containing solutions in Li-ion batteries.