Patent Number: 8,501,307

Title: Recompressed exfoliated graphite articles

Abstract: This invention provides an electrically conductive, less anisotropic, recompressed exfoliated graphite article comprising a mixture of (a) expanded or exfoliated graphite flakes; and (b) particles of non-expandable graphite or carbon, wherein the non-expandable graphite or carbon particles are in the amount of between about 3% and about 70% by weight based on the total weight of the particles and the expanded graphite flakes combined; wherein the mixture is compressed to form the article having an apparent bulk density of from about 0.1 g/cm.sup.3 to about 2.0 g/cm.sup.3. The article exhibits a thickness-direction conductivity typically greater than 50 S/cm, more typically greater than 100 S/cm, and most typically greater than 200 S/cm. The article, when used in a thin foil or sheet form, can be a useful component in a sheet molding compound plate used as a fuel cell separator or flow field plate. The article may also be used as a current collector for a battery, supercapacitor, or any other electrochemical cell.

Inventors: Zhamu; Aruna (Centerville, OH), Shi; Jinjun (Columbus, OH), Guo; Jiusheng (Centerville, OH), Jang; Bor Z. (Centerville, OH)

Assignee: Nanotek Instruments, Inc.

International Classification: B32B 9/00 (20060101); H01B 1/04 (20060101); H01B 1/06 (20060101)

Expiration Date: 2021-08-06 0:00:00