TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The fluoride compound contains element of copper, zinc and/or bismuth.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further comprises: cationic-exchanging reaction of (I) to obtain (A2); reacting (I) with an organic compound containing an onium cation to give (A3), and exchanging a cation of (A3) to obtain (A2); and reacting (A3) with an alkali metal salt to obtain (A2). The method comprises: reacting (A1) with the organic compound containing the onium cation to give an organic salt of chlorosulfonylimide of formula ((R5)(Cl-S(O)2-N-S(O)2-R3)n) (A4); and reacting (A4) with the fluoride compound to obtain (A3). (A1) is obtainable by using cyanogen chloride and amidosulfuric acid as a starting material. Preferred Definitions:    R2 = alkali metal;    R3 = Cl (in (A1));    R4 = F (in (I) and (A2)); and    l = 1.    SPECIFIC COMPOUNDS - Preparation of 13 compounds (I) is disclosed e.g. bis(di(fluorosulfonyl)imide)zinc salt of formula ((Zn2+)(F-S(O)2-N--S(O)2-F)2), bis(di(fluorosulfonyl)imide)copper salt, tris(di(fluorosulfonyl)imide)bismuth salt, (di(fluorosulfonyl)imide)lithium salt and (di(fluorosulfonyl)imide)ammonium salt.    EXAMPLE - Liquid sulfuric anhydride (80.1 g) was charged in a reaction vessel (200 ml), and cyanogen chloride gas (61.5 g) was introduced at 25-35 degrees C over 15 hours. The temperature of the reaction solution was adjusted to 25-30 degrees C, followed by stirring for 0.5 hour and worked up to give chlorosulfonyl isocyanate (g1). Chlorosulfonic acid (148.7 g) was added in a reaction vessel (500 ml), followed by heating to 120 degrees C. Then, (g1) (180.4 g) was added to the reaction vessel over 2 hours and the mixed solution was heated to 150 degrees C, followed by stirring for 6 hours and worked up to give di(chlorosulfonyl)imide (g2). (g2) (2.18 g) and acetonitrile (4.36 g) were added in a reaction vessel (20 ml), followed by stirring. Zinc fluoride (2.63 g) was added into the reaction vessel, followed by conducting a reaction at room temperature (25 degrees C) for 24 hours and worked up to give bis(di(fluorosulfonyl)imide)zinc salt.