Effect of ether group on the electrochemical stability of zwitterionic imidazolium compounds

• Published in: Electrochemistry communications Vol. 10; no. 11; pp. 1761 - 1764
• Main Authors: Kim, H., Nguyen, D.Q., Bae, H.W., Lee, J.S., Cho, B.W., Kim, H.S., Cheong, M., Lee, H.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.11.2008; Amsterdam Elsevier; New York, NY
• Subjects: Applied sciences; Cycle performance; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrolytes; Exact sciences and technology; Ionic liquids; Lithium battery; Zwitterion; Lithium battery; Ionic liquids; Zwitterion; Electrolytes; Cycle performance; Cycling; Organic cation; Stability; Organic carbonate; Ether; Electrical properties; Ionic conductivity; Secondary cell; Ionic liquid; Sulfonate; Electrolyte; Lithium Hexafluophosphates; Specific capacity; Electrical characteristic
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2008.09.006

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 LiPF 6 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.