▎ 摘　　要

NOVELTY - Preparing iron-based phosphate lithium battery materials using ferrophosphorus slag, comprises (i) roasting ferrophosphorus slag at 500-1200℃ for 3-10 hours to obtain P2O5 gas phase and solid phase products; (ii) passing phosphorus pentoxide gas phase into pure water to obtain phosphoric acid solution; (iii) using dilute nitric acid to carry out acid leaching to described solid phase product and obtaining solid-liquid separation to obtain iron-containing filtrate;(iv) mixing production raw materials including lithium source, iron-containing filtrate, and phosphoric acid solution into a mixed solution; (v) adding carbon source to mixed solution so that carbon content of the solution is 8-10 wt.%, to obtain a precursor solution; (vi) drying precursor solution under a vacuum of -800 to -600Pa at 75-100℃ to obtain a precursor material and a by-product gas phase; and (vii) calcining precursor material to obtain an iron-based phosphate lithium battery material. USE - The method is useful for preparing iron-based phosphate lithium battery materials using ferrophosphorus slag. ADVANTAGE - The method enables to prepare iron-based phosphate lithium electric material, which has reduced raw material cost. The oxidizing nitrate radical species react with the reducing organic carbon species to release heat, which saves energy and reduces consumption, the reaction decomposition gas is convenient for constructing porous structure material, further improving the material conductive ability. The manganese source increases the discharge voltage under the premise of keeping the capacity, and improves the specific energy.