| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing iron (III) orthophosphate of general formula FePO·nHO, where n?2.5, the iron (III) orthophosphate obtained using said method and to use thereof to produce lithium ferrophosphate (LiFePO) as a cathode material for lithium-ion batteries. The method of producing iron (III) orthophosphate includes a) preparing an aqueous solution containing Feions by introducing iron (II), iron (III) or mixed iron (II, III) oxide compounds selected from hydroxides, oxides, oxide hydroxides, oxide hydrates, carbonates and hydroxide carbonates, together with elementary iron, into a phosphoric acid-conataining aqueous medium, to dissolve Feions and to react Fewith elementary Fe in a comproportionation reaction to give Fe, b) separating solids from the phosphoric-acid aqueous Fesolution, and c) adding an oxidation agent to the phosphoric-acid aqueous Fesolution to oxidise iron (II) in the solution to precipitate iron (III) orthophosphate.EFFECT: obtained iron (III) orthophosphate has high degree of purity.16 cl, 4 dwg, 7 ex |
