Title:
METHOD FOR PRODUCING IRON LITHIUM PHOSPHATE, ELECTRODE ACTIVE SUBSTANCE, AND SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2013/018757
Kind Code:
A1
Abstract:
In the present invention, a mixed aqueous solution is prepared by blending prescribed proportions of a P source such as H3PO4, a divalent iron compound such as FeSO4·7H2O and an oxidizing agent such as H2O2. Next, this mixed aqueous solution is added dropwise to a buffer solution having a pH of 1.5 to 9 so as to generate a FePO4·nH2O co-precipitated powder. LiOH·nH2O is dissolved in pure water so as to obtain a strongly alkaline aqueous solution having a pH of 12 to 13, the FePO4·nH2O is added to the strongly alkaline aqueous solution so as to cause a reaction between the FePO4·nH2O and the LiOH·nH2O and produce a LiFePO4 co-precipitated powder, and this LiFePO4 co-precipitated powder is then fired so as to obtain a LiFePO4 fired powder. In this way, it is possible to easily produce a finely particulate, high purity iron lithium phosphate, which is suitable for use as an electrode active substance for a secondary battery, using a simple production process.
Inventors:
KINTAKA YUJI (JP)
Application Number:
PCT/JP2012/069317
Publication Date:
February 07, 2013
Filing Date:
July 30, 2012
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
KINTAKA YUJI (JP)
KINTAKA YUJI (JP)
International Classes:
C01B25/45; H01M4/58
Foreign References:
| JP2007305585A | 2007-11-22 | |||
| JP2009295465A | 2009-12-17 | |||
| JP2009534288A | 2009-09-24 | |||
| JP2002211908A | 2002-07-31 |
Other References:
WENXIU PENG ET AL.: "A novel sol-gel method based on FeP04-2H20 to synthesize submicrometer structured LiFeP04/C cathode material", J. POWER SOURCES, vol. 196, no. 5, 1 March 2011 (2011-03-01), pages 2841 - 2847
Attorney, Agent or Firm:
KUNIHIRO YASUTOSHI (JP)
Kunihiro Yasutoshi (JP)
Kunihiro Yasutoshi (JP)
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Claims: