Iron (III) orthophosphate, process for producing it, use thereof for preparing LiFePO4 cathode material for Li ion accumulators, said Li ion accumulator cathode material and said Li ion accumulators

摘要

Iron (III) Orthophosphate for Ion Accumulators The present invention relates to iron (III) orthophosphate of the formula fep04 x nh20 (n $ 2.5), prepared by a process which comprises iron (II) compounds, iron (! li) or mixed iron (ll, ili) selected from hydroxides, oxides, oxideshydroxides, oxides hydrates, carbonates and hydroxide carbonates are reacted with phosphoric acid with a concentration in the range of 5% to 50%, any iron (ll ) present after the reaction being converted to iron (lll) by the addition of an oxidant, and solid iron (lll) orthophosphate being separated from the reaction mixture.