Ionic liquid electrolytes compatible with graphitized carbon negative without additive and their effects on interfacial properties |
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Authors: | Toshinori Sugimoto Manabu Kikuta Eriko Ishiko Michiyuki Kono Masashi Ishikawa |
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Affiliation: | 1. Department of Applied Chemistry, Faculty of Engineering, Kansai University, 3-3-35 Yamate-cho, Suita 564-8680, Japan;2. Dai-ichi Kogyo Seiyaku Co., Ltd., 55, Nishi-Shichijo, Higashikubo-cho, Shimogyo-ku, Kyoto 600-8873, Japan;3. Research Center for Business Academia Collaboration, Kansai University, 3-3-35 Yamate-cho, Suita 564-8680, Japan |
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Abstract: | Introduction of bis(fluorosulfonyl)imide (FSI) as an anion to an ambient-temperature ionic liquid electrolyte based on 1-ethyl-3-methylimidazolium (EMI) as well as lithium (Li) cations can provide a reversible Li intercalation into a graphitized electrode, while such intercalation is completely irreversible without FSI. The surface-layer components on the graphitized electrodes, cycled in the ionic liquid electrolytes with and without FSI, were found to be chemically similar based on X-ray photoelectron spectroscopy. Ac impedance spectroscopy revealed that the resistance of the electrode charged with FSI was much lower even than that charged in a solvent electrolyte system containing ethylene carbonate (EC) and dimethyl carbonate (DMC). On the basis of these physicochemical analyses, the origins of cycleability in the presence of FSI are discussed. |
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Keywords: | Ionic liquid Graphite negative electrode X-ray photoelectron spectroscopy Ac impedance spectroscopy |
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