POSITIVE CURRENT COLLECTOR, POSITIVE ELECTRODE PLATE, SECONDARY BATTERY, AND DEVICE

A positive current collector (10), a positive electrode plate (20), a secondary battery (5), and an apparatus, the positive current collector (10) comprising a support layer (101), provided with two opposing surfaces (101a, 101b) in the thickness direction thereof, and a conductive layer (102) arranged on at least one of the two surfaces (101a, 101b) of the support layer (101), wherein the conductive layer (102) has a thickness D1 satisfying 300 nm ≤ D1 ≤ 2µm; and when the positive current collector (10) has a the tensile strain of 1.5%, the conductive layer (102) has a sheet resistance growth rate of T ≤ 30%. The positive current collector (10) has higher safety performance and meanwhile higher electrical performance, and thus a positive electrode plate (20) and a secondary battery (5) adopting the positive current collector (10) could have higher safety performance and meanwhile higher electro-chemical performance.