Vibrational Spectroscopic Study on Ion Solvation and Ion Association of Lithium Tetrafluoroborate in 4‐Ethoxymethyl‐ethylene Carbonate |
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| Authors: | Hong‐Wei QIAO He‐Lin LUAN Zhi‐Ming ZHOU Xiang‐Peng FANG Wen YAO Xin WANG Ji‐Mei LI |
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| Institution: | 1. Beijing General Research Institute of Mining and Metallurgy, Beijing 100044, China;2. School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China;3. Laboratory for Solid State Ionics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Solvation and association interactions in solutions of lithium tetrafluoroborate/4‐ethoxymethyl‐ethylene carbonate (EEC) have been studied as a function of concentration of lithium tetrafluoroborate by infrared and Raman spectroscopy. Strong interactions between Li+ and solvent molecules or BF4? anions were observed. Splitting of the ring symmetric angle deformation band, the carbonyl stretching band and the skeletal ring vibrational band suggests that the interaction between Li+ ions and EEC molecules take place via the oxygen atom on the carbonyl group. The apparent solvation numbers of Li+, varying from 4.32 to 1.26 with increasing the solution concentrations, were deduced. Band‐fitting to the B–F stretching band of BF4? anion permits detailed assess of ion pairing. The spectroscopically free BF4? anion, contact ion pair and contact ion dimmers coexist in concentrated solutions. |
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| Keywords: | vibrational spectroscopy ion solvation and association lithium tetrafluoroborate solvation number |
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