Patent ID: 7871728

Claim:
A nonaqueous electrolyte secondary battery comprising: a positive electrode plate having an elongated positive electrode substrate and a positive electrode mixture layer containing a positive electrode active material coated on the positive electrode substrate such that an uncoated part is formed along at least one long side of the positive electrode substrate; a negative electrode plate having an elongated negative electrode substrate and a negative electrode mixture layer coated on the negative electrode substrate such that an uncoated part is formed along at least one long side of the negative electrode substrate; and a separator laminated between the positive electrode plate and the negative electrode plate; the positive electrode plate, the negative electrode plate and the separator being forming a rolled electrode, the positive electrode mixture layer including a lithium transition-metal compound capable of insertion and separation of lithium ion, and 5 to 15% by mass of a conductive material with respect to the positive electrode mixture, the conductive material containing not less than 70% by mass of flaked graphite particles with an average particle diameter (D 50 ) of 5 to 30 μm and an average thickness of 0.1 to 1.0 μm with respect to the whole amount of the conductive material, and a packing density of the positive electrode mixture layer being 2.00 to 2.80 g/cc.