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AssigneeNEC Corporation
InventorKatsumi Maeda
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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).
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.
Dependencies are inferred from the claim text.