Patent ID: 9287567
Filing Date: 2016-03-15
CPC Classification: H01M,Y02E,Y02T

Claim Text:
1. A secondary battery comprising: a cathode including a cathode active material layer on a cathode current collector; an anode; and an electrolytic solution, wherein: the cathode active material layer includes spherical secondary active material particles each comprising a plurality of first primary particles and planular secondary active material particles each comprising a plurality of second primary particles, the spherical secondary active material particles are each included in a first region of the cathode active material layer and the planular secondary active material particles are each included in a second region of the cathode active material layer that is farther from the cathode current collector than the first region, the first primary particles have an average particle diameter that is larger than an average particle diameter of the second primary particles, and the spherical secondary active material particles have an average degree of circularity that is larger than an average degree of circularity of the planular secondary active material particles.