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:
Jul. 15, 2008
Filed:
Jan. 22, 2007
Yoshito Ishii, Hitachi, JP;
Tatsuya Nishida, Hitachi, JP;
Atsushi Fujita, Hitachi, JP;
Kazuo Yamada, Hitachi, JP;
Yoshito Ishii, Hitachi, JP;
Tatsuya Nishida, Hitachi, JP;
Atsushi Fujita, Hitachi, JP;
Kazuo Yamada, Hitachi, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Abstract
A graphite particle obtained by assembling or binding together a plurality of flat-shaped particles so that the planes of orientation are not parallel to one another, or a graphite particle in which aspect ratio is 5 or less or specific surface area is 8 m/g or less or the size of crystallite in the direction of c-axis of the crystal is 500 Å or more and the size of crystallite in the direction of plane is 1,000 Å or less as measured by X ray broad angle diffraction, or a graphite particle in which pore volume of the pores having a size falling in a range of 10to 10Å is 0.4 to 2.0 cc/q per weight of graphite particle or pore volume of the pores having a size falling in a range of 1×10to 2×10Å is 0.08 to 0.4 cc/g per weight of graphite particle is suitable for production of negative electrode of lithium secondary battery, and a lithium secondary battery obtained therefrom is excellent in rapid charge-discharge characteristics, cycle characteristics, etc.