TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The polymer is chosen from polyethylene oxide, polyacrylate, and polypropylene oxide, and has weight average molecular weight of 100000 or more. The non-flammable polymer mixture and/or non-aqueous electrolyte include supporting electrode. Preferred Component: A polymer battery is provided with gel electrolyte, positive electrode and negative electrode. EXAMPLE - Polyethylene oxide (in g) (45) having weight average molecular weight of 500000-600000, diphosphoryl tetra-fluoride (5) and lithium hexafluoro phosphate (LiPF6) (3.7) were mixed, acetonitrile (10 ml) was added, uniformly mixed and subjected to dissolution process at 80 degrees C, to obtain polyethylene-oxide sol. The obtained sol was heated at 40 degrees C under vacuum, acetonitrile was volatilized and dried. Then, a mixed solution of ethylene carbonate and ethyl methyl carbonate in volume ratio of 1:1 was impregnated as non-aqueous electrolyte, and swelled, to obtain gel-form polymer battery electrolyte. The obtained gel-form polymer battery electrolyte was nonflammable, and provides excellent safety and high limiting oxygen index measured based on JIS K7201. Acetylene black (in mass parts) (3) and polyvinylidene fluoride (3) were added to lithium-manganese oxide compound (LiMn2O4) (94), and mixed with mixed solvent of ethyl acetate and ethanol. The obtained kneaded material was coated with doctor blade on aluminum foil having thickness of 25 mu m, and dried using hot air at 100-120 degrees C, to obtain positive electrode sheet. Then, the obtained kneaded material was coated on graphite having thickness of 150 mu m and dried using hot air, to obtain negative electrode. The polyethylene-oxide sol of gel-form electrolyte was coated on both surface of polyethylene separator, and acetonitrile was evaporated, to obtain dry-cleaning gel. The obtained dry-cleaning gel was inserted between the positive electrode sheet and negative electrode sheet, wound-up, nonaqueous electrolyte was impregnated and swollen, to obtain AA polymer battery. The polymer battery had excellent safety and discharge capacity maintenance factor of 142 mAh/g at initial stage and 141 mAh/g after completing 50 cycles.