Graphite film and method for producing graphite film

摘要

Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.

主权项

1. A method for producing a graphite film, the method comprising
providing a heat-treated film that is a polymer film that has been subjected to a heat treatment, graphitizing the heat-treated film to give the graphite film, wherein the graphitizing comprises substeps (i) and (ii): (i) subjecting the heat-treated film to a first graphitizing heat treatment at a temperature of not less than 2,000° C. while the heat-treated film is in a state of being wrapped around an internal core, wherein the heat-treated film is loosened by the first graphitizing heat treatment, and (ii) winding up the heat-treated, loosened film during the first graphitizing heat treatment, after the first graphitizing heat treatment and prior to a subsequent graphitizing heat treatment, or during a subsequent graphitizing heat treatment.