| US 7,583,058 B2 | ||
| Method of charging lithium ion secondary battery including a constant current, charging apparatus, and power supply apparatus | ||
| Tsuyoshi Iijima, Chuo-ku (Japan); Kazuya Ogawa, Chuo-ku (Japan); Toshifumi Tanaka, Chuo-ku (Japan); and Satoshi Maruyama, Chuo-ku (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Filed on Nov. 15, 2004, as Appl. No. 10/986,956. | ||
| Claims priority of application No. 2003-390858 (JP), filed on Nov. 20, 2003. | ||
| Prior Publication US 2005/0194934 A1, Sep. 08, 2005 | ||
| Int. Cl. H02J 7/00 (2006.01) | ||
| U.S. Cl. 320—128 [320/107; 429/231.1] | 14 Claims |
| 1. A method of charging a lithium ion secondary battery, the lithium ion secondary battery comprising 1) a positive electrode
that includes a mixed metal oxide containing at least Li, Mn, and Ni as metal components as a positive electrode active material,
2) a negative electrode, and 3) a nonaqueous electrolytic solution containing a lithium salt, the method comprising:
constant current charging the lithium ion secondary battery with a set charging current value I1 corresponding to a set value nC satisfying a condition represented by an expression (1):
10C<nC≤60C (1) where C is a rated capacity value of the lithium ion secondary battery, and n is a number from 2 to 60, wherein
the mixed metal oxide simultaneously satisfies conditions of expressions (I) to (IV):
LixMnyNizCo(1-y-z)O2 (I)
0.85≤X≤1.1 (II)
0.1≤Y≤0.5 (III)
0.55≤Z≤0.8 (IV) where X, Y, and Z in expression (I) indicate values simultaneously satisfying the conditions of expressions (II) to (IV).
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