Graphite-base hydrogen storage material and production method thereof

• Main Authors: YONETA KOJI, HATANO MASAHARU, SHIRAHIGE MINORU, ITO MASASHI, KAWAI MIKIO, KATAMURA JUNJI
• Format: Patent
• Language: English
• Published: 26.01.2006
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING

Disclosed is a hydrogen storage material and a production method thereof. The hydrogen storage material has a carbon material having: an interlayer space for hydrogen occlusion, produced by removal at least a portion of an organic compound from a graphite intercalation compound comprising graphite and the organic compound intercalated in the graphite; and an active point at which hydrogen is adsorbed, being produced on the remaining organic compound and/or a part of the hexagonal carbon layers defining the interlayer space. It has a layered lattice structure with hexagonal carbon layers and an expanded interlayer space, and its density determined in accordance with He equilibrium pressure density measuring method changes according as pre-equilibrium He pressures and falls in a range of 0.2 to 1.2 g/cm3 at pre-equilibrium pressures of 0.2 MPa and 0.8 MPa. The hydrogen storage material is produced by; preparing an organic-graphite intercalation compound; and reducing the organic-graphite intercalation compound to remove at least a portion of the inserted organic compound from the organic-graphite intercalation compound, thereby forming an interlayer space.