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:
Dec. 11, 2012
Filed:
Jul. 10, 2009
Akihide Tanaka, Hitachinaka, JP;
Hidetoshi Honbou, Hitachinaka, JP;
Akihide Tanaka, Hitachinaka, JP;
Hidetoshi Honbou, Hitachinaka, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Abstract
The present invention is to provide a lithium ion secondary battery that realizes to raise an initial charge and discharge efficiency without deteriorating its charge and discharge characteristic in comparison with the conventional technology. A carbon material and a lithium ion secondary battery using the carbon material as the anode material, wherein the face interval dof the carbon material determined by an X ray diffraction apparatus is not less than 0.340 nm and not more than 0.370 nm, and further, V/Vrepresenting a ratio of a volume Vof pores having diameters from not less than 1 nm to less than 10 nm in the carbon material with respect to a volume Vof pores having diameters from not less than 10 nm to less than 100 nm therein is not more than 0.2.