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:
May. 24, 2011
Filed:
Sep. 02, 2004
Kouichi Takei, Hitachi, JP;
Kiyoshi Suzuki, Hitachi, JP;
Tatsuya Nishida, Hitachi, JP;
Hideyuki Inomata, Naruto, JP;
Hiroshi Nakagawa, Tokushima-ken, JP;
Katsuya Imai, Naruto, JP;
Yoshihiro Shoji, Tokushima, JP;
Masayuki Terasaka, Awaji, JP;
Kouichi Takei, Hitachi, JP;
Kiyoshi Suzuki, Hitachi, JP;
Tatsuya Nishida, Hitachi, JP;
Hideyuki Inomata, Naruto, JP;
Hiroshi Nakagawa, Tokushima-ken, JP;
Katsuya Imai, Naruto, JP;
Yoshihiro Shoji, Tokushima, JP;
Masayuki Terasaka, Awaji, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In order to provide a nonaqueous electrolyte secondary battery negative electrode material that has an excellent discharging capacity, the charge/discharge efficiency and the charge load characteristics, a manufacturing method thereof, a nonaqueous electrolyte secondary battery negative electrode with the negative electrode material and a nonaqueous electrolyte secondary battery, the invention provides a nonaqueous electrolyte secondary battery negative electrode material including graphite particles that have a block-like structure where a plurality of flat graphite fine particles assembles or bonds non-parallel with each other, the aspect ratio of 5 or less and a volume of fine pores in the range of 10 to 10nm in a volume of 400 to 2000 cm/kg; and a layer of carbon formed on a surface of the graphite particle, wherein a ratio (by weight ratio) of the layer of carbon to the graphite particle is in the range of 0.001 to 0.01, a manufacturing method thereof, a nonaqueous electrolyte secondary battery negative electrode with the negative electrode material and a nonaqueous electrolyte secondary battery.