Reversible phase transformation-type electrolyte based on layered shape polyoxometalate
Abstract
Reversible phase transformation-type electrolyte, consisting of 1-(3-sulfonic group)propyl-3-methyl imidazolium cation (MIMPS) and tungstovanadophosphoric anion with Keggin structure, [MIMPS]4PW11VO40, is synthesized and characterized using elemental analysis, IR, UV, XRD, and TG-DTA. This product is in quasi-solid-state, a novel type of ionic liquid, with a layered type of structure. This compound can process the phase transition from a crystal phase to an isotropic phase below 100 °C. Moreover, the DTA and conductivity–temperature plot shows an observable increase in conductivity above 84.2 °C, which is caused by the phase transformation from crystal phase to isotropic phase. This novel electrolyte material exhibits high conductivity (8.60 × 10−2 S cm−1 at 83 °C and 80% relative humidity). In the range of the measured temperature, its conductivity increases with higher temperature, indicating that the conductive activation energy for this conduction step is 42.06 kJ mol−1.
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