TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The electrolytic salt is chosen from lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(trifluoromethanesulfone)imide and lithium bisperfluoroethanesulfonimide. The positive electrode contains positive electrode active material containing compound chosen from lithium composite metal oxide and lithium-containing olivine-type phosphate. The negative electrode active material contains compound chosen from occlusion and dischargeable metallic compound in a carbon material with negative electrode able to occlude and discharge lithium metal, lithium alloy, and lithium, and lithium. Preferred Property: The molar ratio of lithium hexafluorophosphate with respect to lithium tetrafluoroborate, lithium bis(trifluoromethanesulfone)imide and lithium bisperfluoroethanesulfonimide is 70:30-99:1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The nitrile compound (1) is obtained by reacting cyano alcohol and halo-1-5C thionyl in presence of base and in presence or absence of solvent. Preferred Component: The nonaqueous solvent contains cyclic carbonate and linear carbonate. Preferred Property: The capacitance ratio of cyclic carbonate and linear carbonate is 10:90-40:60. Preferred Definitions:    R4=2-cyanoethyl, 1,1-dimethylcyanomethyl, 1,1-dimethylcyanoethyl, or 2-propynyl.    SPECIFIC COMPOUNDS - 14 Nitrile compounds such as bis(2-cyanoethyl)sulfone of formula: NC-CH2-CH2-SO2-CH2CH2CN, 2-cyanoethyl-2-propynyl sulfone, 2-cyanoethyl-2-propynyl sulfite, 1,1-dimethylcyanomethyl-2-propynyl sulfite and 1,1-dimethylcyanomethyl-2-propynyl oxalate, are claimed.    EXAMPLE - 2-Cyanoethanol (in g) (11.69), propargyl alcohol (9.22) and triethylamine (33.29) were dissolved in toluene (400 ml). Further, thionyl chloride (19) was dripped to the resulting mixture at 10 degrees C for 20 minutes and stirred at 25 degrees C for 2 hours. Then, triethylamine hydrochloride was filter-separated, and the filtrate was concentrated and purified to obtain 2-cyanoethyl-2-propynyl sulfite (4) having yield of 14%. A lithium ion secondary battery was formed using the obtained 2-cyanoethyl-2-propynyl sulfite.