Method of producing iron phosphate, lithium iron phosphate, electrode active substance, and secondary battery
AssigneeMurata Manufacturing Co., Ltd.
InventorYuji Kintaka
Life of this patent
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Abstract
A mixed aqueous solution is prepared in which a phosphorus source, a divalent Fe compound, and an oxidant are mixed at a predetermined ratio. Then, this mixed aqueous solution is dropwise added into a buffer solution having a pH value of 1.5 to 9, thereby to produce a precipitated powder of FePO4. This FePO4 is synthesized with a lithium compound to obtain LiFePO4. An electrode active substance containing this LiFePO4 as a major component is used as a positive electrode material of a secondary battery.
Claims12
A method of producing iron phosphate, the method comprising bringing a mixed aqueous solution, in which a phosphorus source and an iron compound containing trivalent iron are dissolved, into contact with a buffer solution having a pH value of 1.5 to 9 to produce a powder consisting of iron phosphate.
Dependencies are inferred from the claim text.