US 12,113,219 B2
Reduced graphene oxide-graphite composite material, method for producing same, and lithium ion secondary battery using same
Katsumi Maeda, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/421,361
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jan. 8, 2020, PCT No. PCT/JP2020/000291
§ 371(c)(1), (2) Date Jul. 7, 2021,
PCT Pub. No. WO2020/145298, PCT Pub. Date Jul. 16, 2020.
Claims priority of application No. 2019-001754 (JP), filed on Jan. 9, 2019.
Prior Publication US 2021/0399300 A1, Dec. 23, 2021
Int. Cl. 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)
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)] 7 Claims
OG exemplary drawing
 
1. A reduced graphene oxide-graphite composite material in which a reduced graphene oxide and a graphite are formed into a composite, wherein a 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 as measured by X-ray photoelectron spectroscopy (XPS), and a mass ratio of the reduced graphene oxide and the graphite in the reduced graphene oxide-graphite composite is 90:10 to 20:80.