| 摘要 |
<p>A mixed aqueous solution, in which a phosphorus source such as H3PO4, a divalent Fe compound such as FeSO4·7H2O and an oxidant such as H2O2 are mixed at a predetermined ratio, is prepared. A pH regulating agent having a pH of 6-9 (preferable a pH of 6.5-7.5) is introduced into the mixed aqueous solution, thereby increasing the pH of the solution to 1.5 or higher within 60 seconds and producing a FePO4 sediment powder. This FePO4 sediment powder is filtered, cleaned and dried so as to be formed into a powder, and then synthesized with a lithium compound such as Li(CH3COO), thereby obtaining LiFePO4. An electrode active material which is mainly composed of this LiFePO4 is used for a positive electrode (4) of a secondary battery. Consequently, there are provided: a method for producing iron phosphate, by which iron phosphate in the form of fine particles having a uniform particle size distribution can be easily obtained; lithium iron phosphate which is obtained using the production method; an electrode active material which is mainly composed of this lithium iron phosphate; and a secondary battery which contains the electrode active material in the positive electrode.</p> |
