| US 7,452,633 B2 | ||
| Non-aqueous electrolyte secondary battery and process for producing positive electrode for use in non-aqueous electrolyte secondary battery | ||
| Takashi Suzuki, Aichi (Japan); Toshiyuki Miwa, Shizuoka (Japan); Hiroto Sagisaka, Shizuoka (Japan); Kenji Nabekura, Shizuoka (Japan); Masanori Nakanishi, Shizuoka (Japan); and Minoru Inagaki, Shizuoka (Japan) | ||
| Assigned to FDK Corporation, Tokyo (Japan) | ||
| Filed on Apr. 11, 2005, as Appl. No. 11/103,420. | ||
| Application 11/103420 is a continuation of application No. PCT/JP03/12906, filed on Oct. 08, 2003. | ||
| Claims priority of application No. 2002-299238 (JP), filed on Oct. 11, 2002. | ||
| Prior Publication US 2006/0292447 A1, Dec. 28, 2006 | ||
| Int. Cl. H01M 4/58 (2006.01) | ||
| U.S. Cl. 429—231.8 | 4 Claims |
| 1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode formed of a graphite powder, where a Lc (112) which is the size of crystallite in a c axis direction
which is calculated from a (112) diffraction line of a graphite crystal and determined by a powder X-ray diffraction method
is from 4 nm to 30 nm, and a charge capacity at the first cycle which is calculated on the basis of a total weight of a graphite
material filled in the battery is 20 to 50 (mAh/g); and
a negative electrode formed of a material capable of absorption/desorption of a lithium metal and lithium,
wherein said positive electrode and said negative electrode are placed to oppose each other in an electrolyte containing lithium
salt; and
wherein the graphite powder of said positive electrode has a ratio (A/B) of a specific surface area A which is determined
by a nitrogen absorption (BET) method and a surface area B which is determined from an area average diameter which is 20 or
less.
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