TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The ionic conductive material comprises alkali metal salt and/or alkaline earth metal salt. EXAMPLE - Methyl pyrrolidone (in g) (85) and 2-butanone (400) were taken in a flask. The content was maintained at 50degreesC under nitrogen stream. n-butyl bromide (205.5) was added for 2 hours, and reacted at 80degreesC for 2 hours. The reaction solution was filtered to obtain yellow white crystal of 1-methyl-3-butyl pyrrolidium bromide (MBPyBr). The crystal was washed with 2-butanone to obtain white MBPyBr (187) with yield of 90%. Potassium tricyano methide (25.8) was dissolved in ion exchange water, and filtered. Silver nitrate (34) was dissolved in ion exchange water (100). The filtered solution was added for 1 hour, and reacted at 40degreesC. The content was stirred for 3 hours, and filtered. A white product as cake was formed. The cake was dispersed in ion exchange water, and suction filtered thrice to obtain tricyano methide silver (AgTCM). Obtained AgTCM (50) and ion exchange water (200) were taken in a flask, and stirred at room temperature. White MBPyBr (31.2) was dissolved in ion exchange water (200). The obtained solution was dropped to the AgTCM aqueous solution for 2 hours. The content was maintained at 30degreesC or less. The content was stirred at room temperature for 24 hours. The deposit was removed by suction filtration. The filtrate was evaporated, and volatile compound was removed. The obtained content was dried at 60degreesC for 3 days under reduced pressure to obtain yellow liquid of 1-methyl-3-butyl pyrrolidium tricyano methide (MBPyTCM). Lithium bis trifluoro methane sulfonyl imide (LiTFSI) (10) in tetrahydrofuran was added to the obtained MBPyTCM (100), and stir-mixed. The pressure reduction removal of tetrahydrofuran was performed to obtain electrolyte. The electrolyte had ion conductivity of 9.2x10 to the power 3, 3x10 to the power 3 and 0.8x10 to the power 3 S/cm at 25, 0 and -20degreesC, respectively.