Patent ID: 8124278

Claim:
A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte, wherein a material mixture layer containing an active material and a binder is formed on a surface of a current collector of at least one of the positive electrode and the negative electrode, the material mixture layer includes a first layer and a second layer which are different in volume ratio of the binder to the active material, the volume ratio (A) of the binder in the first layer which is in contact with a surface of the current collector is not less than 2.4 vol % and less than 4.7 vol % and the volume ratio (B) of the binder in the second layer is not less than 4.7 vol % and not more than 50 vol %, and the volume ratio (B) of the binder in the second layer is 2.5 or more times higher than the volume ratio (A) of the binder in the first layer.