Method for recovering waste lithium manganese iron phosphate electrode material and preparing oxygen evolution reaction catalyst based on ternary deep eutectic solvent

Abstract

The invention discloses a method for recycling a waste lithium manganese iron phosphate electrode material and preparing an oxygen evolution reaction catalyst based on a ternary deep eutectic solvent. The method comprises the following steps: pre-treating a positive plate of the waste lithium iron manganese phosphate battery to obtain an electrode material; then adding into a ternary deep eutectic solvent composed of choline chloride, oxalic acid dehydrate and ascorbic acid, and realizing rapid dissolution of all components under mild conditions; water is added to induce precipitation, so that iron and manganese ions are separated out in the form of a ferromanganese oxalate solid solution; adjusting the pH value of the filtrate to precipitate lithium phosphate, thereby realizing selective recovery of lithium, phosphorus and transition metal; preparing the oxalate ferromanganese solid solution into slurry, coating foamed nickel with the slurry, and performing electrochemical activation in-situ reconstruction to obtain an iron-manganese-based oxyhydroxide, thereby obtaining the high-performance oxygen evolution reaction catalyst. The ternary deep eutectic solvent can be recycled by supplementing oxalate. The process disclosed by the invention is green and environment-friendly, high in added value of products and good in application prospect.

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