A cathode is disclosed. In some implementations, the cathode includes a current collector, a first cathode mixture layer on at least one surface of the current collector, and a second cathode mixture layer on the first cathode mixture layer. The first cathode mixture layer includes a first cathode active material having a layered crystal structure, and the second cathode mixture layer includes a second cathode active material having an olivine-based crystal structure. The first cathode mixture layer and the second cathode mixture layer have a thickness ratio of 1:9 to 4:6.