| US 7,572,552 B2 | ||
| Nonaqueous electrolyte secondary battery | ||
| Shinsuke Matsuno, Kashiwa (Japan); Tatsuoki Kohno, Tokyo (Japan); Takao Sawa, Yokohama (Japan); and Norio Takami, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Apr. 16, 2004, as Appl. No. 10/825,437. | ||
| Claims priority of application No. 2003-113190 (JP), filed on Apr. 17, 2003; and application No. 2003-336246 (JP), filed on Sep. 26, 2003. | ||
| Prior Publication US 2004/0258993 A1, Dec. 23, 2004 | ||
| Int. Cl. H01M 4/38 (2006.01) | ||
| U.S. Cl. 429—223 [429/231.5] | 8 Claims |
| 1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode including an alloy having a CeNiSi2 type crystal structure; and
a nonaqueous electrolyte,
wherein the alloy is made of a ternary alloy system that has a composition represented by a formula
LnM1xM2y
where Ln denotes at least one kind of element selected from the elements having an atomic radius falling within a range of
1.6×10−10 m to 2.2×10−10m, M1 is at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, and Nb, M2 is at least
one element selected from the group consisting of P, Si, Ge, Sn and Sb, and x and y satisfy the conditions of 0.5≤x≤1.5 and
1.5≤y≤3.5.
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