TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The electrolyte also contains at least one of lithium hexafluorophosphate and Li(CF9SO2)2 (sic).    TECHNOLOGY FOCUS - ELECTRONICS - Preferred Composition: The electrolyte contains 0.5-1.0 mol/kg in terms of Li concentration of the solvent.Preferred Device: The gel electrolyte battery comprises:(a) a positive electrode containing an active material;(b) a negative electrode comprising an active material and facing the positive electrode; and(c) the above gel electrolyte arranged between the electrodes    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The matrix polymer is polyvinylidene fluoride, a polyvinylidene fluoride/hexafluoropropylene copolymer, polyethylene oxide and/or polypropylene oxide, preferably a polymer of molecular weight 500,000-700,000 obtained by copolymerizing hexafluoropropylene and vinylidene fluoride in a weight ratio of less than 8 wt.%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: Dichloroanisole is added to the non-aqueous solvent. EXAMPLE - First, a positive electrode an a negative electrode were fabricated. For fabricating the positive electrode, 92 wt.% of lithium cobaltate (LiCoO2), 3 wt% of powdered polyvinylidene fluoride and 5 wt.% of powdered graphite were dispersed in N-methyl pyrrolidone (NMP) to form a slurry, which was coated on both surfaces of an aluminum foil as a positive electrode current collector. The resulting product was dried at 100 degreesC for 24 hours under reduced pressure. The dried product was compressed by a roll press operating under a suitable pressure to give a positive electrode sheet. This positive electrode sheet was sliced to a rectangular shape 50 mm by 300 mm and a lead of an aluminum foil 50 microm in thickness was welded to a portion of the positive electrode current collector not coated with the positive electrode mixture to serve as a positive electrode terminal. This produced a positive electrode. For fabricating a negative electrode, 91 wt.% of artificial graphite and 9 wt.% of powdered polyvinylidene fluoride were dispersed in NMP to form a slurry. This slurry was coated on both sides of the copper foil as a negative electrode current collector and dried at 100 degreesC for 24 hours under reduced pressure. The dried product was compressed by a roll press operating under a suitable pressure to give a negative electrode sheet. This negative electrode sheet was sliced to a rectangular shape 52 mm by 320 mm and a lead of a copper or nickel foil 50 microm in thickness was welded to a portion of the negative electrode current collector not coated with the negative electrode mixture so as to serve as a negative electrode terminal. This produced a negative electrode. A PVDF based gel electrolyte was then prepared as an electrolyte. In preparing the gel electrolyte, a PVDF (polyvinylidene fluoride) - HPF (hexafluoropropylene) copolymer, in which 7 wt.% of PVDF is replaced by HFP, an electrolytic solution and dimethyl carbonate (DMC), a solvent for polymers, were mixed together at a weight ratio of 1:5:8 and stirred at 75 degreesC to give a sol-like electrolytic solution. Difluoro anisole was to be added. The electrolytic solution was prepared by dissolving lithium phosphate hexafluoride (LiPF6) in a solvent obtained on mixing ethylene carbonate (EC), propylene carbonate (PC) and gamma-butyrolactone (GBL) at a weight ratio of EC = 30%, PC = 70% and GBL = 0%, so that the amount of lithium phosphate hexafluoride (LiPF6) in the solvent will be 0.76 mol/kg. Then, using a bar coater, the above-mentioned electrolytic solution was coated on the active material layers of the positive electrode and the active material layers of the negative electrode, and the solvent was volatilized in a vessel maintained at a constant temperature of 70 degreesC to form a gel electrolyte layer. The positive and negative electrodes then were layered together, with the gel electrolyte layers in-between, and coiled in the longitudinal direction to form an electrode coil. Finally, this electrode coil was packed in vacuum with a general-purpose laminate film, comprised of an aluminum foil sandwiched between polyolefin films. The positive electrode terminal and the negative electrode terminal were clinched in the sealing opening to complete the gel electrolyte battery.