▎ 摘　　要

NOVELTY - Method for recovering and preparing graphene-based lithium iron phosphate from a waste battery involves (i) discharging a waste lithium iron phosphate battery, crushing and disassembling to obtain a positive electrode sheet and a negative electrode sheet, (ii) crushing and winnowing, obtaining aluminum powder and lithium iron phosphate from the positive electrode sheet and obtaining copper powder and graphite powder from the negative electrode sheet, (iii) introducing the lithium iron phosphate into an inert gas for heat treatment to obtain lithium iron phosphate powder, (iv) adding 3-10 % lithium source based on the mass lithium iron phosphate powder to the lithium iron phosphate powder, and mixing to obtain dry powder, (v) adding the dry powder, the dispersant with the dry powder mass of 1-5% and the graphene powder with the dry powder mass of 1-3% to N-methylpyrrolidone and uniformly stirring to obtain a mixed slurry and (vi) evaporating the solvent and sintering and cooling. USE - The method is useful for recovering and preparing graphene-based lithium iron phosphate from a waste battery. ADVANTAGE - The method can effectively recycle waste battery, reduces the raw material cost and environmental pressure and provides the product with excellent electrical conductivity and rate charge and discharge performance. DETAILED DESCRIPTION - Method for recovering and preparing graphene-based lithium iron phosphate from a waste battery involves (i) discharging a waste lithium iron phosphate battery, crushing and disassembling to obtain a positive electrode sheet and a negative electrode sheet, (ii) respectively crushing and winnowing the positive electrode sheet and the negative electrode sheet, obtaining aluminum powder and lithium iron phosphate from the positive electrode sheet and obtaining copper powder and graphite powder from the negative electrode sheet, (iii) introducing the lithium iron phosphate into an inert gas under a vacuum environment for heat treatment to obtain lithium iron phosphate powder, (iv) adding 3-10 % lithium source based on the mass lithium iron phosphate powder to the lithium iron phosphate powder, and mixing to obtain dry powder, (v) adding the dry powder, the dispersant with the dry powder mass of 1-5% and the graphene powder with the dry powder mass of 1-3% to N-methylpyrrolidone and uniformly stirring to obtain a mixed slurry and (vi) evaporating the solvent in the mixed slurry and sintering and cooling in an inert atmosphere.