▎ 摘　　要

NOVELTY - Positive current collector comprises supporting layer, which is provided with two opposite surfaces in the thickness direction of itself, a conductive layer, set on at least one of the two surfaces of the supporting layer. The material of the conductive layer is aluminum or aluminum alloy, the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2 microns, preferably is more than or equal to 500nm but less than or equal to 2 microns, more preferably 600nm is less than or equal to D1less than or equal to 1.5 microns. USE - Positive current collector. ADVANTAGE - The positive current collector has high safety performance and high electro-chemical performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) an positive pole piece, which comprises a positive electrode current collector and a positive electrode active material layer arranged on the positive electrode current collector; and (2) an electrochemical device, which comprises a positive pole piece, a negative pole piece, a separator and an electrolyte.