CURRENT COLLECTOR AND PREPARATION METHOD THEREFOR, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND ELECTRICAL DEVICE

This application provides a current collector and a preparation method thereof, a secondary battery containing such current collector, a battery module, a battery pack, and an electric apparatus. The current collector in this application includes a support layer, a binder layer, and a metal layer, where the binder layer is arranged between the support layer and the metal layer, the binder layer includes an organic binder and inorganic particles, a thickness D of the binder layer is 1.0-5.0 µm, optionally 1.0-3.0 µm; and the inorganic particles include large particles with a median particle size D and small particles with a median particle size D, and the median particle sizes of the large particles and the small particles satisfy the following relationships: D > D; D = (0.5-0.9) × D; and D = (0.1-0.4) × D.