Positive electrode and lithium secondary battery manufactured using same

A positive electrode comprising a positive electrode active material layer, wherein

• the positive electrode active material layer comprises a first lithium iron phosphate and a second lithium iron phosphate as a positive electrode active material,
• wherein the first lithium iron phosphate has an average particle diameter D50 greater than that of the second lithium iron phosphate,
• when the cross section of the positive electrode is observed with a scanning electron microscope (SEM), the cross section of the first lithium iron phosphate has at least one side having a length of 2 μm or more, and
• wherein the positive electrode comprises a positive electrode current collector, and the positive electrode active material layer formed on at least one surface of the positive electrode current collector, wherein
• an adhesive force between the positive electrode current collector and the positive electrode active material layer measured through a 90-degree peel test is 70 gf/20 mm to 200 gf/20 mm.