首页> 外文期刊>International Journal of Electrochemical Science >Vinylene Carbonate Modified 1-Butyl-3-Methyle-Imidazolium Tetrafluoroborate Ionic Liquid Mixture as Electrolyte
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Vinylene Carbonate Modified 1-Butyl-3-Methyle-Imidazolium Tetrafluoroborate Ionic Liquid Mixture as Electrolyte

机译:碳酸亚乙烯酯修饰的1-丁基-3-甲基-咪唑四氟硼酸酯离子液体混合物为电解质

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Vinylene carbonate (VC) has higher reduction potential than that of 1-butyl-3-methyl-imidazoliumtetrafluoroborate (BMIMBF4) and can form solid electrolyte interface (SEI) film on lithium (Li) metalsurface. VC modified the mixed electrolyte based on BMIMBF4 and -butyrolactone (-BL) has beeninvestigated. The result indicates that the optimized mixed electrolyte, - BL / BMIMBF4 (70/30,-1 volume ratio) -1 M LiBF4, has high conductivity(14.87 mS cm ) at 25 C. Electrochemical impedancespectroscopy discloses that the addition of VC improves the compatibility of the mixed electrolytetowards lithium anodes and enhances the formation of SEI film to protect lithium anodes fromcorrosion. Accordingly, the Li/LiFePO4 battery with VC modified the BMIMBF4/-BL - 1 M LiBF4,-1 has a high discharge capacity of 123.1 mAh g without any considerable fading during the first 20cycles at a current density of 0.1C.
机译:碳酸亚乙烯酯(VC)的还原电势高于1-丁基-3-甲基咪唑四氟硼酸酯(BMIMBF4)的还原电势,并且可以在锂(Li)金属表面上形成固体电解质界面(SEI)膜。已经研究了VC改性基于BMIMBF4和-丁内酯(-BL)的混合电解质。结果表明,优化的混合电解质-BL / BMIMBF4(70/30,-1体积比)-1 M LiBF4在25 C时具有高电导率(14.87 mS cm)。电化学阻抗谱法表明,添加VC可以改善电导率。混合电解质与锂阳极之间的相容性,并增强了SEI膜的形成,以保护锂阳极免受腐蚀。因此,具有VC修饰的BMIMBF4 / -BL-1M LiBF4,-1的具有VC改性的Li / LiFePO4电池在电流密度为0.1C的前20个循环中具有123.1mAh g的高放电容量,而没有任何明显的褪色。

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