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AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYumiko Yoneda, Teppei Oguni, Takuya Miwa, Masaki Yamakaji, Ayae Tsuruta
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To provide a manufacturing method of graphene oxide that allows mass production through a relatively simple process, at low costs, and with safety and efficiency. A hydrogen peroxide solution, sulfuric acid, and flake graphite are put in a reaction container, and the mixture is stirred to obtain expansion graphite. The synthesized expansion graphite is washed not with pure water but with a saturated aqueous solution of magnesium sulfate (MgSO4) or an organic solvent, whereby a large amount of sulfuric acid is contained between graphite layers. The expansion graphite is subjected to heat treatment or microwave irradiation to form expanded graphite, and a graphite layer is peeled by ultrasonic treatment and then oxidized to form a graphene compound.
A method for manufacturing a graphene compound, comprising the steps of:
A method for manufacturing a graphene compound, comprising the steps of:
A method for manufacturing a secondary battery, comprising the steps of:
Dependencies are inferred from the claim text.