A carbon nanotube composition capable of producing an FET having improved mobility is provided. The carbon nanotube composition of the present invention is a halogen-free carbon nanotube composition comprising a carbon nanotube having the following features (1) and (2).

(1) A dispersion liquid obtained by dispersing the carbon nanotube in a solution containing a cholic acid derivative and water has, in the absorption spectrum in the wavelength range of 300 nm to 1100 nm measured by an ultraviolet/visible/near-infrared spectroscopy, the minimum absorbance in the range of 600 nm to 700 nm and the maximum absorbance in the range of 900 nm to 1050 nm; wherein the ratio of the minimum absorbance and the maximum absorbance is 2.5 or more and 4.5 or less; and
(2) the dispersion liquid has the height ratio of the G-band and the D-band (value of (D/G)×100) of 3.33 or less, as measured by a Raman spectrophotometer, using light having a wavelength of 532 nm as excitation light.

CNT foams and methods are provided. The methods may include forming, in a non-solvent liquid, a suspension of CNTs and particles of a pyrolytic polymer; removing the non-solvent liquid; and removing the particles of the pyrolytic polymer to produce a CNT foam having cells that at least substantially correspond to the dimensions of the particles of the pyrolytic polymer. CNT foams having porous structures also are provided.

A method for producing a carbon nanotube-metal composite in which carbon nanotubes are layered on a metal substrate, the method comprising: (i) depositing a liquid, in which carbon nanotubes are suspended, onto said metal substrate; (ii) during or after step (i), subjecting said liquid to a shearing force sufficient to spatially confine the liquid to induce at least partial alignment of said carbon nanotubes on said metal substrate; and (iii) removing said liquid to produce said carbon nanotube-metal composite; wherein, after step (iii), the lengthwise dimensions of said carbon nanotubes are adhered to and oriented parallel with said metal surface, and said carbon nanotubes are at least partially aligned with each other. In some embodiments, the liquid is deposited in the form of droplets, and the droplets are subjected to a shearing force to cause them to elongate, which induces at least partial alignment of the carbon nanotubes.

The present invention relates to a carbon nanotube having an La(100) of less than 7.0 nm when measured by XRD and a specific surface area of 100 m.sup.2/g to 196 m.sup.2/g, and an electrode and a secondary battery including the carbon nanotube.

A method for carbon nanotube purification, preferably including: providing carbon nanotubes; depositing a mask; and/or selectively removing a portion of the mask; and optionally including removing a subset of the carbon nanotubes and/or removing the remaining mask.

Electrical device including a substrate having a surface and a radiofrequency field effect transistor (RF-FET) on the substrate surface. RF-FET includes a CNT layer on the substrate surface, the CNT layer including electrically conductive aligned carbon nanotubes, and pin-down anchor layers on the CNT layer. A first portion of the CNT layer, located in-between the pin-down anchor layers, is not covered by the pin-down anchor layers and is a channel region of the radiofrequency field effect transistor and second portions of the CNT layer are covered by the pin-down anchor layers. For cross-sections in a direction perpendicular to a common alignment direction of the aligned CNTs in the first portion of the CNT layer: the aligned CNTs have an average linear density in a range from 20 to 120 nanotubes per micron along the cross-section, and at least 40 percent of the aligned CNTs are discrete from any CNTs of the CNT layer.

The invention relates to a silicon-based anode material for a lithium-ion battery, a preparation method therefor, and a battery. The silicon-based negative electrode material is prepared by the compounding of 90 wt %-99.9 wt % of a silicon-based material and 0.1 wt %-10 wt % of carbon nanotubes and/or carbon nanofibers which grow on the surface of the silicon-based material in situ.

Carbon nanostructures are used to prepare electrode compositions for lithium ion batteries. In one example, carbon nanostructures, fragments of carbon nanostructures and/or fractured carbon nanotubes are provided in an aqueous dispersion that can be used in the manufacture of silicon-containing anodes. The aqueous dispersion can further include another conductive carbon additive such as carbon black.

The present invention provides a dispersant for carbon materials, the dispersant containing a copolymer having a nitrogen-containing group, wherein the copolymer has a nitrogen content of 0.01 wt % or more and 5 wt % or less and the copolymer has an SP value of 8.0 to 12 (cal/cm.sup.3).sup.1/2.

The invention relates to electrotechnical industry, more particularly to lithium-ion batteries, and even more particularly to lithium-ion batteries with silicon-containing negative electrode (anode). The invention provides a method for producing an anode slurry (paste), an anode slurry (paste), a method for producing an anode for a lithium-ion battery, an anode for a lithium-ion battery, and a lithium-ion battery with a high initial specific capacity and a long cycle life with a large number of charge-discharge cycles over which the battery retains at least 80% of its initial capacity. This result becomes possible due to the presence in the anode material of bundles of single-walled and/or double-walled carbon nanotubes having a length of less than 5 μm, together with bundles of single-walled and/or double-walled carbon nanotubes having a diameter of more than 500 nm and a length of more than 10 μm.