Invention Grant
- Patent Title: Method of producing iron phosphate, lithium iron phosphate, electrode active substance, and secondary battery
- Patent Title (中): 生产磷酸铁，磷酸铁锂，电极活性物质和二次电池的方法
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Application No.: US13767938Application Date: 2013-02-15
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Publication No.: US09543573B2Publication Date: 2017-01-10
- Inventor: Yuji Kintaka
- Applicant: MURATA MANUFACTURING CO., LTD.
- Applicant Address: JP Nagaokakyo-Shi, Kyoto-Fu
- Assignee: MURATA MANUFACTURING CO., LTD.
- Current Assignee: MURATA MANUFACTURING CO., LTD.
- Current Assignee Address: JP Nagaokakyo-Shi, Kyoto-Fu
- Agency: Arent Fox LLP
- Priority: JP2010-182990 20100818
- Main IPC: H01M4/136
- IPC: H01M4/136 ; C01B25/37 ; C01B25/45 ; H01M4/1397 ; H01M4/58 ; H01M10/052
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.
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