期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 112, 期 32, 页码 12550-12556出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp800336n
关键词
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The addition of 2% vinyl ethylene carbonate (VEC) into LiPF6/EC + DMC electrolyte can significantly improve the cyclic performance of a LiNi0.8Co0.2O2/Li cell at elevated temperatures such as 50 degrees C. In situ electrochemical mass spectrometry (EMS) was used to investigate the gas evolution spectroscopy in the cell during a charge/discharge process with and without VEC additive. Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), and liquid nuclear magnetic resonance (NMR) spectroscopies were also carried out to investigate the reactions between various electrolyte components and VEC without the electrochemical reaction. We propose the possible polymerized products based on the spectroscopy and the acting mechanism of the VEC additives.
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