US 7,491,468 B2
Method for preparing positive electrode material for secondary cell, and secondary cell
Shigeto Okada, Fukuoka (Japan); Jun-ichi Yamaki, Kasuga (Japan); Naoki Hatta, Ichihara (Japan); Izumi Uchiyama, Ichihara (Japan); and Toshikazu Inaba, Ichihara (Japan)
Assigned to Japan as represented by the President of the University of Kyusyu, Higashi-Ku, Fukoka-shi (Japan); and Mitsui Engineering & Shipbuilding Co., Ltd. et al., Tokyo (Japan)
Appl. No. 10/531,196
PCT Filed Oct. 17, 2003, PCT No. PCT/JP03/13314
§ 371(c)(1), (2), (4) Date Dec. 12, 2005,
PCT Pub. No. WO2004/036671, PCT Pub. Date Apr. 29, 2004.
Claims priority of application No. 2002-303931 (JP), filed on Oct. 18, 2002.
Prior Publication US 2006/0147365 A1, Jul. 06, 2006
Int. Cl. H01M 4/00 (2006.01); H01M 4/58 (2006.01); C01B 15/16 (2006.01)
U.S. Cl. 429—221  [429/231.95; 423/306] 8 Claims
OG exemplary drawing
 
1. A method for producing a cathode material for a secondary battery, comprising the steps of mixing a compound which releases phosphate ions in a solution with water and metal iron to dissolve the metal iron, adding lithium carbonate, lithium hydroxide or a hydrate thereof to the solution, and calcining the reaction mixture to synthesize LiFePO4.