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. 29, 2014
Filed:
Aug. 05, 2011
Chiaki Sotowa, Tokyo, JP;
Takahiro Tamura, Tokyo, JP;
Chiaki Sotowa, Tokyo, JP;
Takahiro Tamura, Tokyo, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
By a method that includes coking a residue resulting from distillation of crude oil under reduced pressure and having API gravity of 1 to 5, an asphaltene content of 10 to 50%, a resin content of 5 to 30%, and a sulfur content of 1 to 12% to obtain coke, pulverizing the coke to obtain a carbon powder, and heating the carbon powder at 1000 to 3500 deg C., a graphite anode active material for use in a lithium secondary battery is obtained that has, in X-ray powder diffraction, dof not smaller than 0.3354 nm and not greater than 0.337 nm, Lc(004) of smaller than 100 nm, La(110) of not smaller than 100 nm, and a half width of the peak of a plane (101) at a diffraction angle (2θ) of 44 degrees to 45 degrees of not smaller than 0.65 degree.