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Authors
Abstract
Ionic liquids consisted of 1-((2-methoxyethoxy)methyl)-1-methylpiperidinium (PP1MEM) or 1-hexyl-1-methylpiperidinium (PP16) and bis(trifluoromethanesulfonyl)amide (TFSA) were applied to an electrolyte for Li-ion battery. The effect of their cation structure on anode properties of Si electrodes were investigated through the use of thick film prepared by gas-deposition without any binder and conductive additive. The Si electrode in PP1MEM-TFSA exhibited an initial reversible capacity of 2670 mA h g−1, which is larger than that in PP16-TFSA by ca. 900 mA h g−1. Moreover, a comparatively high capacity of 1150 mA h g−1 at a high current density of 4200 mA g−1 is achieved in PP1MEM-TFSA whereas the Si electrode in PP16-TFSA showed the capacity of only 210 mA h g−1. Raman analysis and electrochemical impedance measurements revealed that PP1MEM cation played a role reducing the interaction between Li ion and TFSA anions, and that Li-ion transfer at the electrode−electrolyte interface in PP1MEM-TFSA was remarkably improved compared with PP16-TFSA. These results indicate that the excellent performances obtained in PP1MEM-TFSA originate from a smooth Li-insertion into Si electrode. It was suggested that introduction of ether functional group into cation is valid to enhance the electrode performance.
Publisher
The Electrochemical Society
Content Type
Journal Article
Link
ISSN・ISBN
0013-4651
NCID
AA00697016
Journal Title
Journal of the Electrochemical Society
Current Journal Title
Journal of the Electrochemical Society
Volume
161
Issue
12
Start Page
A1765
End Page
A1771
Published Date
2014-08-08
Publisher-DOI
Text Version
Publisher
Rights
© 2014 The Electrochemical Society. [DOI: 10.1149/2.0021412jes] All rights reserved.
Citation
Journal of the Electrochemical Society. 2014, 161(12), A1765-A1771
Department
Faculty of Engineering/Graduate School of Engineering
Language
English