Effect of ether group on the electrochemical stability of zwitterionic imidazolium compounds |
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Institution: | 1. Department of Chemistry, Kyung Hee University, Seoul 130-701, Republic of Korea;2. Energy and Environment Division, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea |
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Abstract: | The cathodic stability of the zwitterionic imidazolium compounds was significantly enhanced by the introduction of an ether group at 1 or 2-position on the imidazolium ring. The cycle performance tests showed that the initial cell capacity was maintained almost unchanged up to 100 cycles at 0.5 and 1 C when 2.5 wt.% of 2-butoxymethyl-1-methylimidazolium-3-propylsulfonate or 2-butoxymethyl-1-butylimidazolium-3-propylsulfonate was added to the model electrolyte (1 M LiPF6 in ethylene carbonate, dimethyl carbonate and ethylmethyl carbonate (1/1/1 v/v/v)).Structures of zwitterionic compounds and their interactions with lithium ions were theoretically investigated. |
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