Patent ID: 9382117
Filing Date: 2016-07-05
CPC Classification: C01B,C01P,C09K,H01B

Claim Text:
1. A process for producing a highly oriented graphitic film with a thickness no greater than 0.1 mm and physical density no less than 1.8 g/cm 3 , said process comprising: a) preparing a dispersion of graphene oxide (GO) or chemically functionalized graphene (CFG) having GO or CFG sheets dispersed in a liquid medium, wherein said GO sheets contain an oxygen content higher than 5% by weight or said CFG sheets contain non-carbon element content higher than 5% by weight, and GO or CFG sheets are in a liquid crystal phase in said liquid medium; b) dispensing and depositing said GO or CFG dispersion onto a surface of a supporting substrate to form a layer of GO or CFG, wherein said dispensing and depositing procedure includes subjecting said liquid crystal phase to an orientation-inducing stress; c) partially or completely removing said liquid medium from the layer of GO or CFG to form a dried GO or CFG layer having a layer thickness less than 200 μm and having an inter-plane spacing d002 of 0.4 nm to 1.2 nm as determined by X-ray diffraction; d) thermally reducing said dried GO or CFG layer at a first heat treatment temperature higher than 80° C. for a sufficient period of time to produce a porous layer of reduced GO or CFG; e) further heat-treating said porous layer of reduced GO or CFG at a second heat treatment temperature higher than the first heat treatment temperature for a sufficient period of time to produce a porous graphitic film having an inter-plane spacing d002 less than 0.4 nm and the oxygen content or non-carbon element content less than 1% by weight; and f) compressing said porous graphitic film to produce said highly oriented graphitic film.