锂离子电池的2-甲氧乙基（甲基）碳酸酯基电解质,Electrochimica Acta

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锂离子电池的2-甲氧乙基（甲基）碳酸酯基电解质
Electrochimica Acta ( IF 5.5 ) Pub Date : 15 June 2000 , DOI: 10.1016/s0013-4686(00)00394-7
G.Y. Gu , S. Bouvier , C. Wu , R. Laura , M. Rzeznik , K.M. Abraham

碳酸2-甲氧乙酯（MOEMC）被确定为可再充电锂离子电池的有用溶剂。MOEMC中锂盐溶液的电导率-温度和粘度-温度数据可以拟合为Vogel-Tammann-Fulcher（VTF）方程。MOEMC中配制的电解质的特征是在没有遇到凝固点的情况下出现了玻璃化转变温度，这种独特的低温行为使我们能够通过实验确定它们的玻璃化转变温度。这反过来又使我们能够通过实验证明VTF理论在解释这些电解质的电导率-温度数据方面的应用。结果支持溶剂辅助的离子传导机制，这归因于溶剂分子与Li离子之间的强相互作用。溶剂分子与阴离子之间似乎没有强烈的相互作用，但是由于离子对的存在，溶剂的波动间接地辅助了阴离子的传导。溶剂与锂之间的强相互作用⁺已通过核磁共振（NMR）和红外（IR）光谱数据验证。已经测试了在MOEMC中配制的电解质的电化学稳定性以及石墨阳极和LiCoO ₂阴极的Li循环性能，从而证明了其在锂离子电池开发中的效用。

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2-Methoxyethyl (methyl) carbonate-based electrolytes for Li-ion batteries

2-Methoxyethyl (methyl) carbonate (MOEMC) has been identified as a useful solvent for rechargeable Li-ion batteries. The conductivity–temperature and viscosity–temperature data for Li salt solutions in MOEMC can be fitted to the Vogel–Tammann–Fulcher (VTF) equation. The electrolytes formulated in MOEMC are characterized by the appearance of glass-transition temperatures without encountering freezing points, and this unique low-temperature behavior has allowed us to experimentally determine their glass-transition temperatures. This in turn has enabled us to experimentally demonstrate the application of the VTF theory to explain the conductivity–temperature data of these electrolytes. The results support a solvent-assisted ion conduction mechanism attributable to the strong interactions between the solvent molecules and Li ions. There appears to be no strong interaction between solvent molecules and the anions, but because of ion-pairing, the anion conduction is indirectly assisted by solvent fluctuations. Strong interactions between the solvent and Li⁺ have been verified by nuclear magnetic resonance (NMR) and infrared (IR) spectroscopic data. The electrolytes formulated in MOEMC have been tested for their electrochemical stability and Li cycling performance of the graphite anode and the LiCoO₂ cathode, thereby demonstrating their utility for Li-ion battery development.

更新日期：2017-01-31

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