POSITIVE ELECTRODE PLATE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND ELECTRIC APPARATUS

The present application provides a cathode plate, a secondary battery, a battery module, a battery pack, and an electric device. The cathode plate includes: a current collector, a conductive coating, and a cathode active layer. The conductive coating is arranged on at least one surface of the current collector. The conductive coating includes a conductive agent having a weight content of 20% to 50% and a binder having a weight content of 50%~80%. The cathode active layer is arranged on a surface of the conductive coating away from the current collector, and a cathode active material in the cathode active layer is at least one of a lithium manganate-based cathode material, a ternary cathode material, and a quaternary cathode material. The use of the conductive coating effectively avoids the problem of the electrode plate breakage caused by oxidation; in addition, by controlling the amounts of the conductive agent and the binder, not only is the stability of electronic conduction between the current collector and the cathode active material ensured, but also the peel strength between the current collector and the conductive coating is enhanced, thereby effectively improving the cycle performance and cycle stability of the secondary battery containing such cathode plate.