A High‐Performance Zinc–Air Battery Cathode Catalyst from Recycling of Spent Lithium Iron Phosphate Batteries

A novel recycling process of the conductive agent in spent lithium iron phosphate batteries is demonstrated. Wet chemistry applied recovering and phosphate, filter residue calcined with a small amount recovered N2 at 900 °C to form FeNP-codoped carbon catalyst, which exhibits low half-wave potential excellent durability for oxygen reduction. When rechargeable Zn–air battery, power density can reach 80 mW cm−2.