Provided is a positive electrode material slurry for secondary battery including a positive electrode active material, a conductive agent, a binder, and a solvent, wherein the conductive agent includes a first conductive agent and a second conductive agent having different particle shapes and sizes.

Since the conductive agent of the present invention may be uniformly dispersed in the positive electrode active material by including a point-type conductive agent, as the first conductive agent, and carbon nanotubes (CNTs) subjected to a grinding process as the linear second conductive agent, conductivity of an electrode to be prepared may be improved and a secondary battery having improved high-rate discharge capacity characteristics may be provided.

The disclosure generally relates to a dispersion of nanoparticles in a liquid medium. The liquid medium is suitably water-based and further includes an ionic liquid-based stabilizer in the liquid medium to stabilize the dispersion of nanoparticles therein. The stabilizer can be polymeric or monomeric and generally includes a moiety with at least one quaternary ammonium cation from a corresponding ionic liquid. The dispersion suitably can be formed by shearing or otherwise mixing a mixture/combination of its components. The dispersions can be used to form nanoparticle composite films upon drying or otherwise removing the liquid medium carrier, with the stabilizer providing a nanoparticle binder in the composite film. The films can be formed on essentially any desired substrate and can impart improved electrical conductivity and/or thermal conductivity properties to the substrate.

The present invention relates to preparation of a highly dispersible graphene powder. Further, the present invention includes providing an electrode for a lithium ion battery having good output characteristics and cycle characteristics by utilizing a highly dispersible graphene powder. The present invention also includes providing a graphene powder having a specific surface area of 80 m.sup.2/g or more to 250 m.sup.2/g or less as measured by BET measurement, and an oxygen-to-carbon element ratio of 0.09 or more to 0.30 or less as measured by X-ray photoelectron spectroscopy.

In the graphene manufacturing method, a graphite oxide is formed from graphite, and then the graphite oxide is treated with a hydrochloric acid. The hydrochloric acid-treated graphite oxide is reduced at temperature of 120° C. or above and 200° C. or below by performing thermal treatment thereto. Since a low-temperature process is used for manufacturing graphene by performing thermal treatment at a relatively low temperature for a short time, this method has great economic feasibility and utilization. Due to a simple composing process and low thermal treatment temperature, graphene may be mass-produced with a low price. In particular, the graphene may be used as a cathode material for a lithium secondary battery, which exhibits a high capacity at a high voltage of 2V or above by reacting with Li, different from an anode material of a lithium secondary battery.

The disclosure relates to a method for making a carbon nanotube structure, comprising the following steps of providing a carbon nanotube array formed on a surface of a substrate; drawing a first carbon nanotube film from the carbon nanotube array, wherein the first carbon nanotube film comprises a first end connected to the carbon nanotube array and a second end opposite to the first end; providing an elastic rod and fixing the second end of the first carbon nanotube film to a first portion of the elastic rod, wherein the elastic rod is curved toward the carbon nanotube array; and rotating the elastic rod around a rotational axis which coincides with a center axis of the elastic rod, wherein the elastic rod is curved toward the carbon nanotube array during the rotation of the elastic rod.

The disclosure relates to a method for making a carbon nanotube structure, comprising the following steps of: providing a carbon nanotube array formed on a surface of a substrate; drawing a first carbon nanotube film from the carbon nanotube array, wherein the first carbon nanotube film comprises a first end connected to the carbon nanotube array and a second end opposite to the first end; providing an elastic rod and fixing the second end of the first carbon nanotube film to a first portion of the elastic rod, wherein the elastic rod is curved away from the carbon nanotube array; and rotating the elastic rod around a rotational axis which coincides with a center axis of the elastic rod, wherein the elastic rod is curved away from the carbon nanotube array during rotation the elastic rod.

The disclosure relates to a device for making carbon nanotube structure. The device includes: an elastic rod including a first end and a second end opposite to the first end; and a controller connected to the first end and the second end respectively, wherein the controller is configured to rotate the elastic rod around a rotational axis which coincides with a center axis of the elastic rod.

The present invention relates to a method of producing hollow carbon capsules which can simply and effectively produce hollow carbon capsule by using polymer particles as soft templates and using a spray-drying method.

Compositions comprising hydrogenated and dehydrogenated graphite comprising a plurality of flakes. At least one flake in ten has a size in excess of ten square micrometers. For example, the flakes can have an average thickness of 10 atomic layers or less.

A field emission device comprises one or more emitter elements, each having a high aspect ratio structure with a nanometer scaled cross section; and one or more segmented electrodes, each surrounding one of the one or more emitters. Each of the one or more segmented electrodes has multiple electrode plates. This abstract is provided to comply with rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.