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:
Oct. 08, 2024
Filed:
Jan. 08, 2020
Applicant:
Nec Corporation, Tokyo, JP;
Inventor:
Katsumi Maeda, Tokyo, JP;
Assignee:
NEC CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01M 4/587 (2010.01); C01B 32/198 (2017.01); C01B 32/21 (2017.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01); H01M 10/0566 (2010.01);
U.S. Cl.
CPC ...
H01M 4/587 (2013.01); C01B 32/198 (2017.08); C01B 32/21 (2017.08); H01M 2004/027 (2013.01); H01M 10/0525 (2013.01); H01M 10/0566 (2013.01); H01M 2300/0017 (2013.01);
Abstract
An object of the present invention is to provide a reduced graphene oxide-graphite composite material capable of improving battery characteristics such as the charge and discharge efficiency and the capacity retention ratio of a lithium ion secondary battery, and a method for producing the same. The present invention relates to a reduced graphene oxide-graphite composite material in which a reduced graphene oxide and a graphite are formed into a composite, wherein the functional group ratio (C—O/C═O) between C—O bond and C═O bond is 3 to 6 as obtained from a C1s spectrum based on surface analysis measured by X-ray photoelectron spectroscopy (XPS).