Method for preparing phosphorus-doped lithium-rich lithium iron phosphate from waste lithium iron phosphate electrode and product obtained

Abstract

This invention provides a method for preparing phosphorus-doped lithium ferrite using waste lithium iron phosphate (LFP) electrode sheets and the resulting product, belonging to the field of materials synthesis technology. This method creatively recycles waste LFP electrode sheets in the form of phosphorus-doped lithium ferrite, greatly improving their utilization value. The method for synthesizing phosphorus-doped lithium ferrite using waste LFP electrode sheets has the following advantages: 1) This method requires no additional oxidant, is environmentally friendly, and solves the problem of difficult treatment of phosphorus-containing waste from the process; 2) Using waste LFP electrode sheets as raw materials not only reduces costs and yields high-value-added products, but also has high atom utilization, introduces no other impurities, and is pollution-free; 3) Phosphorus doping can improve the conductivity of lithium ferrite, reduce polarization, and improve structural and air stability.