Patent ID: 8900757

Claim:
A lithium ion secondary battery, comprising a positive electrode including a current collector with a positive active material mixture layer applied thereon, the positive active material mixture layer including: active material particles; conductive additive particles comprising a carbonaceous material; and a binder, wherein the ranges of 1 μm≦D≦10 μm, −0.01D+0.57≦b/a≦−0.01D+0.97 hold, and −0.7D+13≦c≦13, where D denotes a value of an average particle diameter D50 of the active material particles, a denotes a volume % of a volume fraction of the active material particles in the positive active material mixture layer, b denotes a volume % of a volume fraction of a vacancy volume in the positive active material mixture layer and c denotes a volume % of a volume fraction of the conductive additive particles in the positive active material mixture layer.