TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: The electrolyteliquid material further contains an alkali metal salt and/or alkalineearth metal salt, a proton, an organic compound having onium cation and anorganic solvent.Preferred Properties: The mixture of ionic liquid, alkali metal saltand/or alkaline earth metal salt has a viscosity of 300 mPa. second orless, and an ionic conductivity of 0.5 ms/cm or more at 0degreesC.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Metal Salt: The alkali metal salt and/or alkaline earth metal salt is lithium salt. EXAMPLE - Silver dicyano amide (in g) (11.7), N-methyl-N-butyl pyrrolidium iodide (16.4) and ion exchange water (150) were refluxed at 50 degrees C under nitrogen stream. Then, ion exchange water insoluble portion was filtered, dried, volatile matter was removed and reaction material was obtained. The obtained reaction material was dissolved in dichloromethane, anhydrous magnesium sulfate was added, the mixture was kept undisturbed for 1 evening and then dried. The mixture was then filtered to remove magnesium sulfate, dichloromethane was evaporated and the residue obtained was dried at 100 degrees C under reduced pressure for 6 hours to obtain 90% yield of N-methyl-N-butyl pyrrolidium dicyano amide (MBPyDCA) (11.4). Sodium dicyano amide (31.5), lithium chloride (10), tetrahydrofuran (140) were stirred at 110 degrees C for 48 hours. Subsequently, tetrahydrofuran insoluble portion was recovered, dried and volatile matter was removed. Then, the residue obtained was dried at 110 degrees C under reduced pressure for 5 hours to obtain 85% yield of lithium dicyano amide (14.6). The obtained product was recrystallized at 120 degrees C under reduced pressure for 10 hours and white plate-shaped crystals were obtained. Lithium dicyano amide was added to N-methyl-N-butyl pyrrolidium dicyano amide and dissolved to obtain electrolyte-liquid material. The obtained electrolyte-liquid material had improved ionic conductivity, durability, and suppresses corrosion of electrodes and electrolyte salt decomposition in high potential.