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Poly(vinylidene fluoride) (PVDF)-based nanocomposite solid polymer electrolytes (NSPEs) were prepared and ion conduction property was investigated according to the filler content. The organically modified clay (Cloisite 1 15A, C15A) was used as a filler because it has had a good compatibility with PVDF. X-ray diffraction measurement revealed the dispersion of C15A in PVDF and the states of exfoliation and intercalation of C15A were also observed by transmission electron microscopy. In order to confirm the ion conduction properties of NSPEs with LiCF 3 SO 3 , ac impedance analyzer and FT-IR spectrometer were used. The highest ionic conductivity was appeared in NSPE containing 5wt% of C15A and the maximum conductivity was 1.04 Â 10 À3 S cm À1 . And the improvement of electrochemical stability of NSPEs by adding C15A was confirmed.