Method for recycling waste lithium iron phosphate positive electrode material and applying recycled waste lithium iron phosphate positive electrode material to iron-air battery

The invention discloses a method for recycling a waste lithium iron phosphate positive electrode material and applying the recycled waste lithium iron phosphate positive electrode material to an iron-air battery, belonging to the field of recovery technologies for lithium iron phosphate positive electrode materials in waste lithium ion batteries and the field of alkaline secondary batteries. According to a technical scheme in the invention, a waste lithium iron phosphate material is used as a raw material and is uniformly mixed with a ferric salt, a bismuth salt and an organic additive so as to obtain a mixture; then the mixture is subjected to calcining in an inert atmosphere so as to prepare a lithium iron phosphate-based composite material; and the lithium iron phosphate-based composite material is used for preparation of the negative electrode of an iron-air battery. The method provided by the invention can efficiently recycle waste lithium ion battery positive electrode materials and apply the recycled w