Positive electrode and lithium secondary battery produced with it

Abstract

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 positive electrode active material, the first lithium iron phosphate having a larger average particle diameter D50 than the second lithium iron phosphate, and 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 with a length of 2 µm or more.