▎ 摘　　要

NOVELTY - A cathode sheet comprises a cathode current collector, a coating layer (I) provided on the cathode current collector, and a coating layer (II) provided on the coating layer (I). The coating layer (II) includes an active material (II), and the surface of the particles of the active material (II) is coated with the graphene (I). USE - Cathode sheet for battery (claimed) used in portable mobile electronic device such as notebook computer and smartphone. ADVANTAGE - The volume expansion of the active material during charging and discharging can be suppressed, thereby suppressing the volume expansion of the cathode sheet. The expansion of the battery volume is suppressed, and the problem of large expansion of the battery volume caused by charging is solved. The graphene is coated on the surface of the particles of the active material, which can form a better conductive network, and can reduce the possibility of lithium precipitation in the cathode sheet.