| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery with thin size and having a large capacity. <P>SOLUTION: The nonaqueous secondary battery has a wound around electrode body in which a positive electrode having a positive electrode mixture layer on one side or both sides of a positive electrode current collector, a negative electrode, and a separator are laminated and these are wound around in spiral shape, sealed together with a non-aqueous electrolyte in an outer package having a ratio of width against thickness of 1.7-10.0. The positive electrode mixture layer has a density of 3.5 g/cm<SP>3</SP>or more and a porosity of 25% or less, and the positive electrode current collector is an Al alloy foil with a thickness of 15 μm or less and a tensile strength of 200 N/mm<SP>2</SP>or more. <P>COPYRIGHT: (C)2009,JPO&INPIT |
