▎ 摘　　要

NOVELTY - Single-layer coated cathode sheet comprises a current collector (6) and a cathode film layer disposed on at least one surface of the current collector. The cathode film layer includes cathode active material and carbon microtubes, optionally includes a conductive agent. The mass fraction W1 of the carbon microtubes in the cathode film layer and the mass fraction W2 of the conductive agent in the cathode film layer satisfy: W1+W2 ≤ 2% when W1 = 0.2-2%, and W2 = 0-0.5% when W1 > 2% based on the total weight of the cathode film layer. USE - The cathode sheet is useful in hydraulic power, firepower, wind power and solar power station energy storage power supply system, electric tool, electric bicycle, electric motorcycles, electric automobile, military equipment and aerospace fields. ADVANTAGE - The method also provides a double-coated cathode sheet, and achieve the purpose of improving the charging performance of the battery and the diffusion capability of the lithium-ion in the cathode layer. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a double-layer coated cathode sheet; a secondary battery; a battery module; a battery pack; and an electric device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a single-layer coated cathode sheet. 6Current collector 7Single-layer cathode film layer