Electrolytes are fundamental materials that have been used in various industrial fields, for example, in batteries. Liquid electrolytes, though widely used, lack safety and moldability because of the inclusion of organic solvents and the inherent fluidity. The superior safety and moldability of solid electrolytes make them possible alternatives to liquid electrolytes. However, the ionic conductivity of solid electrolytes is lower than that of liquid electrolytes. Recently, a gel-type electrolyte, which combines the high ionic conductivity of liquid electrolytes and the safety of solid electrolytes, has been reported. However, the gel-type electrolyte needs various specific techniques for molding. In this presentation, we report a quasi-solid electrolyte comprising a transparent thixotropic gel swelled by an ionic liquid (IL) that is formed by a framework of cylindrical inorganic ‘‘imogolite’’ nanotubes. ILs are molten salts consisting of weakly coordinated cations and anions; ILs exhibit melting points below 100 ºC, low vapor pressure, high thermal stability, and high ionic conductivity. Thixotropy as well as stimuliresponsive liquid/solid phase transitions are important for molding of materials in numerous industrial processes (for example, paints and ceramic sols). An application of thixotropic nature to electrolyte will realize its free molding in accordance with the shape of the conduction interface that is difficult for ordinary liquid/solid/gel electrolytes. Imogolite (IG) is nanotube-like clay mineral, which has a rigid fibrous structure in the form of a single-walled aluminosilicate cylindrical inorganic polymer, with the composition (HO)3Al2O3SiOH. The outer and inner surfaces of IG are covered with Al(OH)2 (proton-capturing) and Si(OH) (proton-releasing) groups, respectively. Recently, we found that mixtures of IG and dicarboxylic acids (DAs) in water resulted in the formation of homogeneous gels, consisting of networked IGs at a mixing ratio, molar ratio of –Al(OH)2 vs. carboxyl groups in DA, of 1 : 1. The gels consisting of IG and DA such as maleic acid (hereafter denoted ‘‘IG–DA gel’’) exhibited hysteresis-free thixotropic behavior. In this study, the thixotropic electrolyte was obtained by substitution of water in the IG-DA gel to ionic liquid. Because of its transparency, moldability, thermal stability, and high ionic conductivity (Figure), the thixotropic gel electrolyte can be used in various applications such as free-moldable conductive and anti-icing coatings, and battery electrolytes. The transparency of the quasi-solid electrolyte would prevent damage to the base materials. Furthermore, specific abilities of the IG thixotropic gel, such as macroscopic supramolecular chiral ordering of the IG nanotubes and electrorheological responsiveness of the IG, indicate significant potential for the use of these IG–DA–IL based quasi-solid electrolytes as chiral sensing materials, multi-stimuli-responsive actuators, etc. Figure 1