| abstract |
A positive electrode 4 having a positive electrode mixture layer containing a positive electrode active material and a binder on a positive electrode current collector, a negative electrode 5, a porous insulating layer 6 disposed between the positive electrode 4 and the negative electrode 5, and In the nonaqueous electrolyte secondary battery having the nonaqueous electrolyte, the tensile extension percentage of the positive electrode 4 is 3.0% or more, and the positive electrode current collector is made of aluminum containing iron. This increases the tensile elongation rate of the positive electrode without causing a decrease in capacity of the nonaqueous electrolyte secondary battery, so that a short circuit occurs in the nonaqueous electrolyte secondary battery even if the nonaqueous electrolyte secondary battery is crushed due to pressure crushing. Can be suppressed.n n n Tensile Elongation, Dynamic Hardness, Iron, Heat Treatment, Softening Temperature |