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:
Jun. 04, 2019
Filed:
Jul. 23, 2013
Kazuhiro Yamamoto, Tokyo, JP;
Mayuri Komoriya, Tokyo, JP;
Motohiro Yamaki, Tokyo, JP;
Tomohito Fukugawa, Tokyo, JP;
Akihiro Kuroyanagi, Tokyo, JP;
Kazuhiro Yamamoto, Tokyo, JP;
Mayuri Komoriya, Tokyo, JP;
Motohiro Yamaki, Tokyo, JP;
Tomohito Fukugawa, Tokyo, JP;
Akihiro Kuroyanagi, Tokyo, JP;
TOKAI CARBON CO., LTD., Tokyo, JP;
Abstract
A method for easily producing a graphite powder for use as a lithium secondary battery negative electrode material with small specific surface area while reducing energy consumption, and achieving high graphitization efficiency, includes melt-mixing a coke powder and a carbon precursor binder so that an amount of fixed carbon included in the carbon precursor binder is 5 to 15 parts by mass based on 100 parts by mass of the coke powder, to prepare a mixture, and pressing the mixture to prepare a compact, the coke powder being obtained by heating a green coke powder at 600 to 1450° C. in a non-oxidizing atmosphere, the green coke powder having a cumulative particle size at 50% in a volumetric cumulative particle size distribution of 5 to 50 μm; heating the compact in a non-oxidizing atmosphere to effect carbonization and graphitization to obtain a graphitized compact; and grinding the graphitized compact.