NOVELTY - An ion-conductive polymer electrolyte secondary battery has a polyelectrolyte layer interposed between a positive electrode and a negative electrode, and a cation. The negative electrode contains graphite material that coated with an amorphous carbon as an active material. The positive electrode contains lithium nickel cobalt metal oxide (A). A first polymer electrolyte is electrolytic salt, non-woven fabric containing polymerizable boron compound (I), and high molecular compound (II). A second polymer electrolyte is arranged in front and back of the first polymer electrolyte.    USE - Ion-conductive polymer electrolyte secondary battery. Uses include but are not limited to handheld terminal e.g. portable audio-video equipment, such as a digital camera, a video camera, a portable audio player and a portable liquid crystal television, a notebook computer, a mobile telephone, an electronic organizer, a handheld game machine device, electric tool, electrically driven bicycle, hybrid motor vehicle, electric vehicle and an electric power storage system.    ADVANTAGE - The secondary battery has high stability and durability, and improved output characteristics, charging/discharging cycling characteristics, safety and flexibility.    DETAILED DESCRIPTION - An ion-conductive polymer electrolyte secondary battery has a polyelectrolyte layer interposed between a positive electrode and a negative electrode, and a cation. The negative electrode contains graphite material that coated with an amorphous carbon as an active material. The positive electrode contains lithium nickel cobalt metal oxide of formula (LiNi1-(x+y)CoxMyO2) (A), where the weight of the compound-material layer of the positive and negative electrodes is below 190 g/m2. A first polymer electrolyte is electrolytic salt, non-woven fabric containing polymerizable boron compound of formula (Z1-(OA1)h-O-B(O-(A1O)i-Z2)(O-(A1O)j-Z3)) (I), and high molecular compound of formula (R1O-(A2O)-R2) (II), where mass ratio of the boron compound (I) and the high molecular compound (II) is 5/95-60/40. A second polymer electrolyte is arranged in front and back of the first polymer electrolyte. The second polymer electrolyte is formed by mixing the high molecular compound, electrolytic salt, silica particles, and additive. The additive is vinylene carbonate, propane sultone or ethylene sulfite, where the mixture ratio is 2-15 mass parts of silica particles, and 0.1-10 mass parts of additives with respect to a total of 100 mass parts of the mass of the high molecular compound (II), and electrolytic salt, and a mass ratio of the first polymer electrolyte and the second polymer electrolyte is 10/90-70/30.    M=aluminum, manganese, boron, titanium, niobium or tungsten;    x,y=0-0.5;    B=boron atom;    Z1,Z2,Z3=acryloyl or methacryloyl group;    A1,A2=2-3C oxyalkylene;    h,i,j=1-3, where h,i,j are average added mole number of an oxyalkylene group;    R1,R2=1-10C hydrocarbon;and    k=5-10, where k is average added mole number of an oxyalkylene group.