A method for preparing a modified graphite includes performing crushing on coal-based needle coke to obtain a first material, performing shaping fine powder removal on the first material to obtain a second material, performing heat treatment on the second material in a reaction kettle and then cooling the second material after the heat treatment to room temperature to obtain a third material, and performing graphitization on the third material in a graphitization furnace and then cooling the third material after the graphitization to room temperature to obtain the modified graphite.

A film includes a film body including graphite, and at least one fragment including graphite and formed on one or more surfaces of the film body. The film has a water contact angle of 50 degrees or greater and a glossiness of 20 or lower.

A graphite material for a negative electrode of a lithium-ion secondary battery is provided. A ratio Lc(112)/Lc(006) defined as a ratio of expansion of graphene sheets to sheet displacement ranges from 0.08 to 0.11, both inclusive. A crystallite size Lc(006) calculated from a wide-angle X-ray diffraction line ranges from 30 nm to 40 nm, both inclusive. An average particle size ranges from 3 μm to 20 μm, both inclusive.

A thermal interlace material for transferring heat by interposing between two materials may include a graphite film. The graphite film may have a thickness T of 200 nm to 3 μm, and a ratio Ra/T of an arithmetic average roughness Ra on a surface of the graphite film to the thickness T of the graphite film, may be 0.1 to 30.

A thermal interlace material for transferring heat by interposing between two materials may include a graphite film. The graphite film may have a thickness T of 200 nm to 3 μm, and a ratio Ra/T of an arithmetic average roughness Ra on a surface of the graphite film to the thickness T of the graphite film, may be 0.1 to 30.

The first present invention is a graphite sheet having a thickness of not more than 9.6 μm and more than 50 nm and a thermal conductivity along the a-b plane direction at 25° C. of 1950 W/mK or more. The second present invention is a graphite sheet having a thickness in a range of less than 9.6 μm and 20 nm or more, an area of 9 mm2 or more, and a carrier mobility along the a-b plane direction at 25° C. of 8000 cm2/V.Math.sec or more.

A method of reducing a gaseous carbon oxide includes reacting a carbon oxide with a gaseous reducing agent in the presence of a non-ferrous catalyst. The reaction proceeds under conditions adapted to produce solid carbon of various allotropes and morphologies, the selective formation of which can be controlled by means of controlling reaction gas composition and reaction conditions including temperature and pressure. A method for utilizing a non-ferrous catalyst in a reactor includes placing the catalyst in a suitable reactor and flowing reaction gases comprising a carbon oxide with at least one gaseous reducing agent through the reactor where, in the presence of the catalyst, at least a portion of the carbon in the carbon oxide is converted to solid carbon and a tail gas mixture containing water vapor.

A method for making carbon fiber film includes growing a carbon nanotube array on a surface of a growth substrate. A carbon nanotube film is pulled out from the carbon nanotube array, and pass through a reaction room. A negative voltage is applied to the carbon nanotube film. A carrier gas and a carbon source gas are supplied to the reaction room to form graphite sheets on the carbon nanotube film.

A thermal interface material for transferring heat by interposing between two materials may include a graphite film. The graphite film may have a thickness of 1 μm to 50 μm, a density of 1.40 g/cm.sup.3 to 2.26 g/cm.sup.3, a thermal conductivity of 500 W/mK to 2000 W/mK in a film plane direction, and an arithmetic average roughness Ra of 0.1 μm to 10 μm on a surface of the graphite film.

A thermal interface material for transferring heat by interposing between two materials may include a graphite film. The graphite film may have a thickness of 1 μm to 50 μm, a density of 1.40 g/cm.sup.3 to 2.26 g/cm.sup.3, a thermal conductivity of 500 W/mK to 2000 W/mK in a film plane direction, and an arithmetic average roughness Ra of 0.1 μm to 10 μm on a surface of the graphite film.