Application of room temperature ionic liquids to Li batteries

• Published in: Electrochimica acta Vol. 53; no. 3; pp. 1048 - 1054
• Main Authors: Sakaebe, Hikari, Matsumoto, Hajime, Tatsumi, Kuniaki
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 20.12.2007; Elsevier
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Li cycling efficiency; Li-ion battery; Li-metal battery; Room temperature ionic liquid; Safety; Li cycling efficiency; Safety; Room temperature ionic liquid; Li-ion battery; Li-metal battery; Differential scanning calorimetry; Cycling; Secondary cell; Thermal stability; Ionic liquid; Lithium battery; Electrolyte; Efficiency; Lithion ion batteries; Thermal analysis; Room temperature; Electrical characteristic
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2007.02.054

Novel electrolyte materials, room temperature ionic liquids (RTILs) were applied to the Li battery system and their characteristics in Li-metal batteries are discussed, partly reviewing authors work in the past. Quaternary ammonium (QA) cation-imide RTIL was focused on because of the excellent stability in cathodic environment of Li. Li/LiCoO 2 cell performance and Li cycling efficiency using the selected QA-imide RTIL was almost satisfactory. In addition, thermal stability of selected QA-imide RTIL with the charged positive electrode and Li was the advantage for Li battery. On the other hand, further improvement in the conducting properties is required with balanced approach for both electrochemical stability and thermal stability in order to use the RTIL electrolyte practically in batteries.