Patent ID: 9487880
Filing Date: 2016-11-08
CPC Classification: C25B,C25D,Y02E,Y02P

Claim Text:
1. A method for reducing graphene oxide to form graphene with the use of a flexible substrate processing apparatus, the flexible substrate processing apparatus comprising: a substrate carrying-out portion comprising an unwinder provided with a first bobbin configured so that a flexible substrate is wound around the first bobbin; a reduction treatment portion comprising a first bath configured to be provided with an electrolyte, a first electrode configured so that the flexible substrate is located in parallel with the first electrode in the first bath, and first rollers configured so that the flexible substrate is soaked in the electrolyte, wherein the electrolyte includes an aprotic solvent; a washing portion comprising a second bath configured to be provided with a washing solution and second rollers configured to support the flexible substrate so that the flexible substrate is soaked in the washing solution; a drying portion comprising a drying means; and a substrate carrying-in portion comprising a winder provided with a second bobbin configured to take up the flexible substrate, wherein one or more of the first bobbin, the second bobbin, the first rollers, and the second rollers serve as a second electrode, the method comprising the steps of: making the flexible substrate be contact with the first bobbin and taking the flexible substrate up in the substrate carrying-out portion; making the flexible substrate and the first electrode be soaked in the electrolyte in the first bath; reducing graphene oxide contained in a film-like structure body formed on the flexible substrate to form graphene by supplying a certain potential to the second electrode so that the flexible substrate is at the same potential as the second electrode, wherein the film-like structure body further comprises an electrode active material; washing the film-like structure body and the flexible substrate in the second bath; drying the film-like structure body and the flexible substrate with the use of the drying means in the drying portion; and taking the flexible substrate up by the second bobbin wherein a reduction potential for the reducing step to be supplied is a reduction potential determined relative to a redox potential of lithium metal, and wherein the reduction potential for the reducing step to be supplied is 2.0 V.