TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Battery: The battery includes a polymer compound which is gelled upon absorption of the nonaqueous electrolytic solution. The battery is present in the form of a nonaqueous electrolyte battery comprising: positive electrode; negative electrode; and nonaqueous electrolytic solution containing solvent and electrolyte salt, where a coating in a gel form containing a compound derived from monofluorophosphate and/or difluorophosphate, and an amorphous polyacid and/or polyacid compound having at least one kind of a polyelement (preferably heteropolyacid and/or heteropolyacid compound) is formed on the negative electrode. The coating in gel form is obtained from the amorphous polyacid and/or polyacid compound deposited so as to have a three-dimensional network structure upon absorbing the electrolytic solution in it.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The polyacid and/or the polyacid compound is a polyacid and/or a polyacid compound, each having at least one kind of a polyelement (preferably the polyacid and/or the polyacid compound is a heteropolyacid and/or a heteropolyacid compound of formula A'x(B'D'12O40).yH2O (I)). The cation constituting the monofluorophosphate and/or the difluorophosphate is lithium, magnesium, or ammonium cation. The electrolyte salt contains lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, and/or lithium hexafluoroarsenate.A'=Li, Na, K, Rb, Cs, Mg, Ca, Al, NH4, quaternary ammonium salt or phosphonium salt;B'=P, Si, As or Ge;D'=Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Zr, Nb, Mo, Tc, Rh, Cd, In, Sn, Ta, W, Re, and/or Tl;x=0-7;y=0-50.Preferred Composition: The nonaqueous electrolytic solution (S1) contains the heteropolyacid and/or the heteropolyacid compound (0.01-3 mass%), and the monofluorophosphate and/or the difluorophosphate (10-5000 ppm).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The solvent is selected from unsaturated cyclic carbonates and/or halogenated cyclic carbonates. EXAMPLE - No suitable example given.