| http://www.w3.org/ns/prov#value | - Alternatively, at least one of P, Ca, Si, Al and Mg for example will melt in the heat treatment step and spread across the entire layered surface of the graphite, making it easier for the element other than carbon to be discharged outside the film when the raw material polymer film is carbonized and graphitized, and allowing the foaming condition to be controlled and pore regions to be formed with
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