Compatibility of N-Methyl-N-propylpyrrolidinium Cation Room-Temperature Ionic Liquid.pdfVIP

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Compatibility of N-Methyl-N-propylpyrrolidinium Cation Room-Temperature Ionic Liquid.pdf

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Compatibility of N-Methyl-N-propylpyrrolidinium Cation Room-Temperature Ionic Liquid

Compatibility of N-Methyl-N-propylpyrrolidinium Cation Room-Temperature Ionic Liquid Electrolytes and Graphite Electrodes Shiro Seki,* Yo Kobayashi, Hajime Miyashiro, Yasutaka Ohno, Yuichi Mita, and Nobuyuki Terada Materials Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1, Iwado-kita, Komae, Tokyo 201-8511, Japan Patrick Charest, Abdelbast Guerfi, and Karim Zaghib Institut de Recherche d’Hydro-Que?bec (IREQ), 1800 Boul, Lionel-Boulet, Varennes, Que?bec, Canada J3X 1S1 ReceiVed: June 19, 2008; ReVised Manuscript ReceiVed: August 19, 2008 To realize high-safety, high-performance lithium ion secondary batteries using room-temperature ionic liquids, we examined [graphite electrode|room-temperature ionic liquid-lithium salt binary electrolyte|lithium metal electrode] cells by varying the cation structure of the room-temperature ionic liquid. In particular, a bis(fluorosulfonyl)imide anion based room-temperature ionic liquid cell showed high charge/discharge capacity and reversibility. By application of electrochemical calorimetric measurements during charge/discharge operation, the formation of a suitable interfacial layer, such as a solid electrolyte interphase between the graphite electrode and the room-temperature ionic liquid-lithium salt binary electrolyte was indicated. Moreover, we found that not only the anion structure but also the cation structure was important for the suitable charge/discharge of the graphite electrode. Introduction To tackle global warming issues, the effective and active utilization of renewable energy (i.e., wind, solar power) worldwide is strongly expected to take a leading role. At the same time, energy storage and conversion devices such as secondary batteries are essential components for the smoothing the electric power generated by renewable energy with an unstable output such an wind power and sunlight, and lithium ion secondary batteries are predicted to be potential candidates for