Abstract
The liquid-crystalline behavior of fluorinated block-structured molecules and the ion transport properties of their complexes with a Li salt have been examined. The block-structured molecules comprise a perfluorinated oligo (ethylene oxide) moiety containing a terminal methyl carbonate or a terminal hydroxyl group and an octadecyl moiety. These molecules exhibit highly ordered smectic phases. The fluorinated molecule with a terminal methyl carbonate possesses an isotropization temperature lower than that of the analogous non-fluorinated molecule. The fluorinated molecule complexed with a Li salt shows ionic conductivities on the order of 10−6 S cm−1 in the smectic phase formed at ambient temperature, while conductivities on the order of 10−5 S cm−1 are observed in the isotropic phase. A perfluorinated oligo (ethylene oxide) monoalkyl ether containing a terminal methyl carbonate has been developed for potential application as quasi-solid-state electrolytes for Li-ion batteries. The fluorinated block-structured molecule self-assembles to form nanosegregated bilayer structures, which can be used for anisotropic Li ion transport when complexed with a Li salt. The complex shows ionic conductivities on the order of 10−6 S cm−1 in the ordered smectic phase formed at ambient temperature.
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