| US 7,611,804 B2 | ||
| Nonaqueous secondary battery and electronic equipment using the same | ||
| Hideo Sakata, Ibaraki (Japan); Hayato Higuchi, Ibaraki (Japan); and Fusaji Kita, Ibaraki (Japan) | ||
| Assigned to Hitachi Maxell, Ltd., Ibaraki-shi, Osaka (Japan) | ||
| Filed on Mar. 30, 2005, as Appl. No. 11/92,652. | ||
| Claims priority of application No. P2004-107162 (JP), filed on Mar. 31, 2004; and application No. P2004-263311 (JP), filed on Sep. 10, 2004. | ||
| Prior Publication US 2005/0221185 A1, Oct. 06, 2005 | ||
| Int. Cl. H01M 4/58 (2006.01) | ||
| U.S. Cl. 429—231.8 [429/322; 429/321; 429/231.7] | 13 Claims |
| 1. A nonaqueous secondary battery comprising an electrode body which comprises a positive electrode, a negative electrode,
a separator laminated between the positive and negative electrodes, and a nonaqueous electrolyte,
wherein said negative electrode contains graphite as a negative electrode active material, has a dried and pressed coating
density of at least 1.70 g/cm3, a pore diameter of the maximum of less than 0.5 μm, and a logarithmic value of differential intrusion of at least 0.14 cm3/g at the pore diameter of the maximum.
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