Ionic plastic crytals are attracting attention as new solid-state electrolytes. Ions in ionic plastic crystals are highly disordered and constituting or doped ions can diffuse in the lattice.Although several structures of ionic plastic crystals are known, there is no systematic study for them. Our differential scanning calorimetric and X-ray diffraction studies on tetraalkylammonium and tetraalkylphosphonium salts of BF4- and PF6-revealed that the structural types of ionic plastic crytals change, depending on the size of the ions, giving CsCl-, NaCl, and inverse-NiAs type structures. Tetrabutylammonium and tetrabutylphosphonium salts have a different type of primitive cubic lattice.Ionic plastic crystal of N,N-dimethylpyrrolidinium fluorohydrogenate has a NaCl-type crystal lattice and exhibits a high ionic conductivity. This ionic plastic crystals works as an electrolyte for electrochemical capacitors using activated carbon electrodes.

Structures of ionic plastic crystals based on fluoroanions

248th National Meeting (2014)

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