▎ 摘　　要

NOVELTY - Cathode sheet, comprises current collector, first cathode active layer, and second cathode active layer, where the first cathode active layer is arranged between current collector and second cathode active layer, the first cathode active layer includes first cathode active material, first conductive agent composed of carbon nanotube cluster, and first agglomerant, the carbon nanotube cluster is composed of multiple bundle-shaped carbon nanotube unit, the diameter of carbon nanotube cluster is more than 0.2 μm, the second cathode active layer includes second cathode active material and second agglomerant, the average gram capacity of first cathode active layer is greater than the average gram capacity of second cathode active layer, and the thickness (H1) of first cathode active layer and the thickness (H2) of second cathode active layer satisfies 0.1≤H1/H2≤1. USE - The cathode sheet is useful in secondary batteries for electronic devices (all claimed). ADVANTAGE - The cathode sheet provides secondary batteries which has high energy density and excellent cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: Secondary battery; and Electronic device.