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:
Apr. 12, 2016
Filed:
Dec. 06, 2011
Tatsuo Umeno, Fukuoka, JP;
Tadanori Tsunawaki, Fukuoka, JP;
Koutarou Mizuma, Fukuoka, JP;
Shinya Okabe, Fukuoka, JP;
Shiroh Oie, Fukuoka, JP;
Tatsuo Umeno, Fukuoka, JP;
Tadanori Tsunawaki, Fukuoka, JP;
Koutarou Mizuma, Fukuoka, JP;
Shinya Okabe, Fukuoka, JP;
Shiroh Oie, Fukuoka, JP;
Nippon Coke & Engineering Co., Ltd., Tokyo, JP;
Abstract
A negative electrode material for lithium ion secondary batteries comprises amorphous coated particles that are composed of a plurality of consolidated particles having no specific shape, said consolidated particles being obtained by consolidating a plurality of primary spheroidized graphite particles, and 0.5-20% by mass of an amorphous carbon layer that covers the surfaces of the consolidated particles and binds the consolidated particles with each other; and 0.5-20% by mass of a highly crystalline carbon layer that is formed so as to cover the outer surfaces of the amorphous coated particles and has an interplanar distance ascribed to CVD processing of 0.335 nm or more but less than 0.3369 nm. The negative electrode material for lithium ion secondary batteries is also characterized by having a porosity of 5% by volume or less, and a method for producing the negative electrode material for lithium ion secondary batteries.