Iron(iii) orthophosphate for li ion accumulators

Details Iron(iii) orthophosphate for li ion accumulators Iron(iii) orthophosphate for li ion accumulators

C - Chemistry, Metallurgy

01

B

C01B 25/37 (2006.01) H01M 4/58 (2010.01)

Patent

CA 2698550

Iron(III) orthophosphate of the general formula FePO4 x nH2O (n <= 2.5), prepared by a process in which iron(II)-, iron(III)- or mixed iron(II, III) compounds selected from among hydroxides, oxides, oxidehydroxides, oxide hydrates, carbonates and hydroxidecarbonates are reacted with phosphoric acid having a concentration in the range from 5% to 50%, any iron(II) present after the reaction is converted into iron(III) by addition of an oxidant and solid iron(III) orthophosphate is separated off from the reaction mixture.

L'invention concerne un orthophosphate ferrique de formule générale FePO4 x nH2O (n = 2,5) qui est produit par un procédé selon lequel on fait réagir des composés ferreux, ferriques ou ferreux et ferriques mélangés, sélectionnés parmi des hydroxydes, des oxydes, des hydroxydes d'oxydes, des hydrates d'oxydes, des carbonates et des carbonates d'hydroxydes, avec de l'acide phosphorique ayant une concentration comprise entre 5% et 50%, on transforme le fer ferreux éventuellement présent après la réaction en fer ferrique par addition d'un agent oxydant et on sépare l'orthophosphate ferrique solide du mélange réactionnel.

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