| US 7,615,315 B2 | ||
| Positive electrode material for lithium secondary cell and process for producing the same | ||
| Koji Tatsumi, Chigasaki (Japan); Toshiaki Abe, Chigasaki (Japan); Naoshi Saito, Chigasaki (Japan); and Manabu Suhara, Chigasaki (Japan) | ||
| Assigned to Seimi Chemical Co., Ltd., Chigasaki-shi, Kanagawa-ken (Japan) | ||
| Appl. No. 10/546,806 PCT Filed Aug. 16, 2004, PCT No. PCT/JP2004/011748 § 371(c)(1), (2), (4) Date Aug. 25, 2005, PCT Pub. No. WO2005/018027, PCT Pub. Date Feb. 24, 2005. |
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| Claims priority of application No. 2003-295171 (JP), filed on Aug. 19, 2003. | ||
| Prior Publication US 2006/0222951 A1, Oct. 05, 2006 | ||
| Int. Cl. H01M 4/58 (2006.01); H01M 4/02 (2006.01) | ||
| U.S. Cl. 429—231.95 [429/231.3; 429/231.6; 423/594.6; 423/464] | 10 Claims |
| 1. A positive electrode material for a lithium secondary battery, comprising an active material including particles, each of the particles comprising a composition represented by a general formula, LiaCobMgcAdOeFf, wherein the element A is tungsten or silicon, 0.90≤a≤1.10, 0.97≤b≤1.00, 0.0001≤c≤0.03, 0.0001≤d≤0.03, 1.98≤e≤2.02, 0≤f≤0.02 and 0.0001≤c+d≤0.03, and wherein the magnesium and the element A, or further fluorine are evenly present in a vicinity of a surface of said particle. |