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. 12, 2023
Filed:
Jul. 28, 2022
Jfe Chemical Corporation, Tokyo, JP;
Jfe Steel Corporation, Tokyo, JP;
Ryota Yamaji, Tokyo, JP;
Yasushi Madokoro, Tokyo, JP;
Akira Matsuzaki, Tokyo, JP;
Yusuke Fushiwaki, Tokyo, JP;
Mikito Suto, Tokyo, JP;
JFE Chemical Corporation, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
Provided is spherically-shaped coated graphite exhibiting excellent cycle capacity-maintaining property when used as a negative electrode material for a lithium ion secondary battery. The spherically-shaped coated graphite includes: spherically-shaped graphite in which primary particles with an equivalent spherical diameter of not more than 0.8 μm have a volume ratio of more than 40.0% and not more than 70.0%, and primary particles with an equivalent spherical diameter of not less than 1.5 μm and not more than 3.0 μm have a volume ratio of not less than 3.0% and not more than 17.0%, in a particle size distribution of primary particles obtained using X-ray computed tomography; and a carbonaceous substance covering the spherically-shaped graphite, and a pore volume of pores with a pore size of 7.8 nm to 36.0 nm is not more than 0.017 cm/g, and a mass of infiltrated dibutyl phthalate is less than 0.70 g/cm.