Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9760350 | Journal of Power Sources | 2005 | 5 Pages |
Abstract
Internal modified-mesoporous SiO2 using ionic liquid (IL-MPSi) as one of the additives has been prepared and added to the poly(ethylene oxide) (PEO)-based solid electrolytes for improving the ionic conductivity. In this study, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) has been used as an ionic liquid. The conductivity was significantly improved by the addition of IL-MPSi, to be more than 10â5Â SÂ cmâ1 at room temperature and at the filler contents of 15Â wt.%, in the solid state. From the combination of dc polarization and ac impedance measurement for lithium cells, it was revealed that the addition of IL-MPSi increased the Li+ transference number (t+), because the EMImBF4 used in this study possesses higher t+ (approximately 0.5) than the PEO-salt simple mixture. This means that the MPSi domains can act as “bypass” for transport of carrier ions to the PEO matrix through the inside IL phase.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yoichi Tominaga, Shigeo Asai, Masao Sumita, Stefania Panero, Bruno Scrosati,