TY - JOUR
AU - Tominaga, Yoichi
AB - Addition of inorganic fillers to polyether-based electrolytes can lead to an increase in ionic conductivity, a reduction in the degree of crystallinity, and an increase in cation transport number. In order to enhance further conductivity of polyether/clay composites, a dispersion of “nano-level” clay in polyether is needed. In this study, we prepared polyether composite filled with freeze-dried clay, which may give a more dispersed state. In a previous study, we reported that supercritical carbon dioxide (scCO2) treatment medium is an effective method for enhancing the conductivity of polyether/saponite (Sa) composites. Here, we prepared polyether/freeze-dried saponite (fSa) composites and treated them with scCO2 and studied the effects of freeze-drying and scCO2 treatment using wide-angle X-ray diffraction (WAXD), transmission electron microscopy (TEM), differential scanning calorimetry, and complex impedance measurements. The WAXD and TEM measurements revealed that the dispersion of Sa in polyether is caused by the freeze-drying pretreatment. Moreover, the combination of freeze-drying and scCO2 treatment gave rise to homogeneous composites, leading to a significant increase in conductivity. The conductivity of the scCO2-treated fSa composite was 100 times greater than that of the original Sa composite.
TI - Improvement in dispersion and ionic conductivity of polyether/freeze-dried clay composites using supercritical carbon dioxide as treatment medium
JF - Ionics
DO - 10.1007/s11581-012-0731-y
DA - 2012-05-13
UR - https://www.deepdyve.com/lp/springer-journals/improvement-in-dispersion-and-ionic-conductivity-of-polyether-freeze-0hFiSlTFRq
SP - 845
EP - 851
VL - 18
IS - 9
DP - DeepDyve
ER -