The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2008
Filed:
Apr. 11, 2005
Takashi Suzuki, Aichi, JP;
Toshiyuki Miwa, Shizuoka, JP;
Hiroto Sagisaka, Shizuoka, JP;
Kenji Nabekura, Shizuoka, JP;
Masanori Nakanishi, Shizuoka, JP;
Minoru Inagaki, Shizuoka, JP;
Takashi Suzuki, Aichi, JP;
Toshiyuki Miwa, Shizuoka, JP;
Hiroto Sagisaka, Shizuoka, JP;
Kenji Nabekura, Shizuoka, JP;
Masanori Nakanishi, Shizuoka, JP;
Minoru Inagaki, Shizuoka, JP;
FDK Corporation, Tokyo, JP;
Abstract
A non-aqueous electrolyte secondary battery in which a positive electrode formed of a graphite powder and an negative electrode formed of a material capable of absorption/desorption of a lithium metal or lithium are placed to face each other in an electrolyte containing lithium salt. The positive electrode of this battery 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 which 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 the graphite material of the positive electrode filled in the battery is 20 to 50 (mAh/g). Preferably, the graphite powder of the positive electrode has an ratio (A/B) which is the ratio of a specific surface area A determined by a nitrogen absorption (BET) method to a surface area B determined on the basis of an area average diameter of 20 or less.