Provided is a carbon film including: a plurality of fibrous carbon nanostructures; and a conductive carbon, wherein the plurality of fibrous carbon nanostructures has a BET specific surface area of 500 m.sup.2/g or more. Also provided is a method of producing a carbon film, the method including mixing a conductive carbon into a fibrous carbon nanostructure dispersion liquid containing a plurality of fibrous carbon nanostructures having a BET specific surface area of 500 m.sup.2/g or more, a dispersant, and a solvent, and subsequently removing the solvent to form a carbon film.

A composition comprising a first particulate electroactive material, a particulate graphite material and a binder, wherein at least 50% of the total volume of each said particulate materials is made up of particles having a particle size D.sub.50 and wherein a ratio of electroactive material D.sub.50 particle size:graphite D.sub.50 particle size is up to 4.5:1.

A conductive material dispersion liquid, and an electrode and a lithium secondary battery manufactured using the same. The conductive material dispersion liquid includes a carbon-based conductive material, a dispersant, and a dispersion medium. The dispersant is a copolymer including a first repeating unit represented by Chemical Formula 1, a second repeating unit represented by Chemical Formula 2, and a third repeating unit represented by Chemical Formula 3, and the dispersion medium is a non-aqueous solvent.

Carbon nanotubes (CNTs) exhibit high electrical and thermal conductivity and good mechanical properties, making them suitable fillers for composites. Their effectiveness as a filler is affected by their state of aggregation. Novel ordered helical wrapping of poly (methyl methacrylate) (PMMA) has been achieved on single wall carbon nanotubes (SWNTs). This carbon nanotube composite not only thwarts CNT aggregation, but also may be successfully leveraged for applications such as electrical energy storage and mechanical reinforcement.

Disclosed are methods for decapping single wall carbon nanotubes and purifying the decapped single wall carbon nanotubes. The disclosed methods include the steps of oxidizing the single wall carbon nanotubes to remove the terminal end cap and subsequently acid washing the single wall carbon nanotubes to remove the catalyst particles. The resulting carbon nanotubes have improved BET surface area and pore volume.

An embodiment of the present specification provides a method for preparing a carbon nanotube, comprising: (a) introducing a catalyst into a chemical vapor deposition reactor; and (b) injecting a carbon source gas to synthesize a carbon nanotube, wherein an input of the catalyst and a flow rate of the carbon source gas satisfy the following Formula 1:

0.1 L/g.Math.min?a/b?1.1 L/g.Math.min[Formula 1] wherein a represents a flow rate (L/min) of the carbon source gas and b represents an input (g) of the catalyst.

The purpose of the present invention is to provide a catalyst support with which it is possible to produce a high-quality fibrous carbon nanostructure. The purpose of the present invention is to provide a catalyst support used when producing a fibrous carbon nanostructure, the catalyst support comprising a carrier and a catalyst layer formed on the carrier, the catalyst layer including a metal-containing compound, and the difference ?YI in yellowness expressed by the formula being 3-20, where YI.sub.A is the yellowness of the carrier, and YI.sub.B is the yellowness of the catalyst support. ?YI=YI.sub.B?YI.sub.A

A method of producing a carbon nanostructure is provided that enables production of a high-quality carbon nanostructure with a high yield. The method of producing a carbon nanostructure includes supplying a feedstock gas to a catalyst and growing a carbon nanostructure by chemical vapor deposition. A gas X that is derived from the feedstock gas and that comes into contact with the catalyst contains a hydrocarbon A having at least one cyclopentadiene skeleton and a hydrocarbon B having at least one acetylene skeleton. A total volume concentration [A] of the hydrocarbon A is at least 0.06%.

A method for producing a carbon nanostructure aggregate having a large external specific surface area and a carbon nanostructure aggregate are provided. The method for producing a carbon nanostructure aggregate comprises supplying a source gas to a catalyst to grow a carbon nanostructure aggregate comprising a plurality of carbon nanostructures by a chemical vapor deposition method, wherein a gas derived from the source gas and brought into contact with the catalyst comprises: as a hydrocarbon to serve as a carbon source, at least one of: a hydrocarbon A having at least one acetylene skeleton, a hydrocarbon B having at least one 1,3 -butadiene skeleton, a hydrocarbon C having at least one cyclopentadiene skeleton, and a hydrocarbon D having at least one allene skeleton, and carbon monoxide and carbon dioxide; and satisfies 0.01[CO]/[C]15 where [C] is a total volume concentration of carbon contained in the hydrocarbons A, B, C, and D, and [CO] is a volume concentration of carbon monoxide.

An embodiment of the present specification provides a method for preparing a catalyst for preparing a carbon nanotube, comprising: (a) dissolving a main catalyst precursor, a support precursor, a cocatalyst precursor and a precipitation inhibitor in a solvent to prepare a precursor solution; and (b) pyrolyzing the precursor solution by spraying the precursor solution into a reactor, wherein a mole fraction of the precipitation inhibitor to the cocatalyst precursor is 0.1 to 1.5.