Lithium–air (O₂) batteries still suffer from a relatively low practical energy density even though it far exceeds other energy storage systems with its extremely high theoretical energy density. The multiphase electrochemical reaction on the air–cathode of a Li–air battery has difficulty in proceeding when operated with solid catalysts. The battery reaction involves three-phase (solid–liquid–gas that is, catalyst–electrolyte–O₂) electrochemical interface which landed in the investigation of a diffusive liquid phase electrocatalyst. Iron phthalocyanines (FePc) were dissolved in 1M LiTFSI (DMSO) electrolyte and employed as liquid catalysts in Li–air batteries. The dissolved FePc facilitated the cell reaction kinetics by acting as a transporter for superoxide species (O₂)^- and electrons between the cathode surface and discharge products, Li₂O₂. The electrochemical battery testing and impedance analyses exhibited better performance with liquid FePc catalysts than the solid catalysts. The proper formation and decomposition of Li₂O₂ without direct contact with carbon surface or blocking of pores were evident from the post characterization studies of the air cathode surfaces.