Abstract: A method for making lithium ion battery anode includes: scrapping a carbon nanotube array to obtain a carbon nanotube source, and adding the carbon nanotube source into water to form a carbon nanotube dispersion; providing a transition metal nitrate, adding the transition metal nitrate to the carbon nanotube dispersion to form a mixture of a carbon nanotube floccule and a transition metal nitrate solution; freeze-drying the mixture of the carbon nanotube floccule and the transition metal nitrate solution under vacuum condition to form a lithium ion batter anode preform; and, heat-treating the lithium ion battery anode preform to form the lithium ion battery anode.

Abstract: A lithium ion battery including a shell, an anode, a cathode and an electrolyte film is provided. The anode includes a carbon nanotube sponge and a plurality of transition metal oxide particles. The carbon nanotube sponge includes a plurality of carbon nanotubes. The carbon nanotube sponge includes a plurality of holes. The plurality of transition metal oxide particles are uniformly attached to surfaces of the plurality of carbon nanotubes and located in the carbon nanotube sponge.

Abstract: A lithium ion battery anode includes a carbon nanotube sponge and a plurality of transition metal oxide particles. The carbon nanotube sponge is a honeycomb structure including a plurality of carbon nanotubes joined with each other by van der Waals attractive force. The carbon nanotube sponge includes a plurality of holes having sizes greater than or equal to 5 microns. The plurality of transition metal oxide particles are uniformly attached to surfaces of the plurality of carbon nanotubes and located in the holes. Sizes of the plurality of transition metal oxide particles are less than or equal to 200 nanometers.

Abstract: A lithium ion battery including a shell, an anode, a cathode, an electrolyte and a separator is provided. The anode includes a carbon nanotube sponge and a plurality of transition metal oxide particles. The carbon nanotube sponge includes a plurality of carbon nanotubes. The plurality of transition metal oxide particles are uniformly attached to surfaces of the plurality of carbon nanotubes and located in the sponge.

Abstract: A method for making a carbon nanotube sponge requires a carbon nanotube source being obtained and an organic solvent being added. The organic solvent is ultrasonically agitated to form a flocculent structure. The flocculent structure is washed by water and a carbon nanotube sponge preform obtained by freeze-drying the flocculent structure in a vacuum. Finally, the carbon nanotube sponge itself is obtained by depositing a carbon layer on the carbon nanotube sponge preform. A carbon nanotube sponge obtained by above method is also presented.

Abstract: An electrostrictive composite includes a flexible polymer matrix and a carbon nanotube film structure. The carbon nanotube film structure is at least partially embedded into the flexible polymer matrix through a first surface. The carbon nanotube film structure includes a plurality of carbon nanotubes combined by van der Waals attractive force therebetween.

Abstract: A method for making a thin film lithium ion battery is provided. A cathode material layer and an anode material layer are provided. A carbon nanotube array is applied to a surface of the cathode material layer and pressed to form a first carbon nanotube layer on the surface of the cathode material layer to obtain a cathode electrode. A second carbon nanotube layer is formed on a surface of the anode material layer to obtain an anode electrode. A solid electrolyte layer is applied between the cathode electrode and the anode electrode to form a battery cell. At least one battery cell is then encapsulated in an external encapsulating shell.

Abstract: An optical wavelength detecting device, the device including: a polarizer configured to transform an incident light into a polarized light; a detecting element configured to receive the polarized light and form a temperature difference or a potential difference between two points of the detecting element, wherein the detecting element comprises a carbon nanotube structure including a plurality of carbon nanotubes oriented along the same direction, and angles between a polarizing direction of the polarized light and an oriented direction of the plurality of carbon nanotubes is adjustable; a measuring device electrically connected to the detecting element and configured to measure the temperature difference or the potential difference; a data processor electrically connected to the measuring device and configured to obtain the optical wavelength by calculating and analyzing the temperature difference or the potential difference.

Abstract: A method for making carbon fiber film includes drawing a carbon nanotube film from a carbon nanotube array. The carbon nanotube film is successively passed through a first room and a second room. A carrier gas and a carbon source gas are supplied to the first room and a carbon layer is formed on the carbon nanotube film located in the first room. The carbon nanotube film with the carbon fiber film is taken into the second room from the first room, and the carbon layer is graphitized.

Abstract: An optical wavelength detecting device, the device including: a polarizer configured to transform an incident light into a polarized light; a detecting element configured to receive the polarized light and form a temperature difference or a potential difference between two points of the detecting element, wherein the detecting element includes a carbon nanotube structure including a plurality of carbon nanotubes oriented along the same direction, and angles between a polarizing direction of the polarized light and an oriented direction of the plurality of carbon nanotubes is adjustable; a measuring device electrically connected to the detecting element and configured to measure the temperature difference or the potential difference; a data processor electrically connected to the measuring device and configured to obtain the optical wavelength by calculating and analyzing the temperature difference or the potential difference.

Abstract: A method for making a lithium-sulfur battery cathode material includes steps of providing a carbon nanotube source; providing sulfur and a first solvent; adding the carbon nanotube source and the sulfur into the first solvent, and ultrasonically agitating the first solvent to form a first suspension. A second solvent is added during an agitation process to form a second suspension and the first solvent and the second solvent are removed from the second suspension. The present disclosure also relates to a lithium-sulfur battery cathode material obtained by the method.

Abstract: A thin film lithium ion battery includes a cathode electrode, an anode electrode, and a solid electrolyte layer. The solid electrolyte layer is sandwiched between the cathode electrode and the anode electrode. At least one of the cathode electrode and the anode electrode includes a current collector. The current collector is a carbon nanotube layer consisting of a plurality of carbon nanotubes.

Abstract: A membrane electrode assembly includes a proton exchange membrane and at least one electrode located on the proton exchange membrane, wherein the at least one electrode includes a carbon fiber film. The carbon fiber film includes at least one carbon nanotube film including a number of carbon nanotubes joined end to end and extending along a same direction. Each of the number of carbon nanotubes is joined with a number of graphene sheets, and an angle is between a lengthwise direction of each of the number of graphene sheets and the number of carbon nanotubes.

Abstract: A cathode of lithium-ion battery includes a carbon fiber film. The carbon fiber film includes at least one carbon nanotube film including a number of carbon nanotubes joined end to end and extending along a same direction. Each of the number of carbon nanotubes is joined with a number of graphene sheets, and an angle is between each of the number of graphene sheets and the number of carbon nanotubes.

Abstract: The present disclosure relates to a lithium-sulfur battery separator. The lithium-sulfur battery separator comprises a separator substrate and a functional layer covered on the separator substrate. The functional layer comprises at least two carbon nanotube layers and at least two graphene oxide composite layers. Each of the at least two graphene oxide composite layers comprises a plurality of graphene oxide sheets and a plurality of manganese dioxide nanoparticles, and the plurality of manganese dioxide nanoparticles are adsorbed on the plurality of graphene oxide sheets and embedded in an interlayer formed by the carbon nanotube layer and the plurality of graphene oxide sheets. The present disclosure also relates to a lithium-sulfur battery comprising the lithium-sulfur battery separator.

Abstract: The present disclosure relates to a method for making a lithium-sulfur battery separator. The method comprises providing a separator substrate, and forming a functional layer on at least one surface of the separator substrate. A method for forming the functional layer comprises applying a first carbon nanotube layer on the at least one surface; dispersing a plurality of graphene oxide sheets and a plurality of manganese dioxide nanoparticles in a solvent to form a mixture; and depositing the mixture on a surface of the first carbon nanotube layer to form a first graphene oxide composite layer; applying a second carbon nanotube layer on a surface of the first graphene oxide composite layer; and forming a second graphene oxide composite layer on a surface of the second carbon nanotube layer.

Abstract: The present disclosure relates to a flexible strain sensor. The flexible strain sensor includes a composite structure, a first electrode, a second electrode and a detector. The composite structure includes a carbon nanotube film and a substrate combined with each other. The carbon nanotube film defines a desired deformation direction and includes a plurality of first carbon nanotubes oriented substantially perpendicular with the desired deformation direction. The plurality of first carbon nanotubes are joined end to end with each other along their orientation direction. The first electrode and the second electrode are separately located at two opposite ends of the carbon nanotube film and electrically coupled with the carbon nanotube film. The detector is electrically connected with the first electrode and the second electrode.

Abstract: The present disclosure relates to a lithium ion battery electrode. The lithium ion battery electrode comprises a current collector and at least one electrode material layers stacked on the current collector. Each of the at least one electrode material layers comprises an electrode active material layer, a conductive agent, an adhesive material, and a carbon nanotube layered structure. The conductive agent and the adhesive material are dispersed in the electrode active material layer. The carbon nanotube layered structure is located on the electrode active material layer, and at least part of the carbon nanotube layered structure is embedded in the electrode active material layer. The electrode active material layer is located between the current collector and the carbon nanotube layered structure.

Abstract: The present disclosure relates to a method for making a lithium ion battery electrode. The method comprises providing a slurry comprising an electrode active material, an adhesive, a dispersant, and a conductive agent; spreading the slurry over a metal sheet to form an electrode active material layer; applying a carbon nanotube layer structure on a surface of the electrode active material layer to form a precursor; and drying the precursor.

Abstract: A method for making a carbon nanotube composite structure includes providing a polymer substrate having a first surface and a second surface opposite to the first surface. A first carbon nanotube layer including a plurality of carbon nanotubes is placed on the first surface to form a preformed structure, wherein the carbon nanotube layer and the polymer substrate are stacked with each other. The preformed structure is scanned with a laser according to a predetermined pattern. The treated preformed structure includes a first part and a second part. The first part is scanned by the laser, and the second part is not scanned by the laser. The first part includes a plurality of first carbon nanotubes, and the second part includes a plurality of second carbon nanotubes. The plurality of second carbon nanotubes is removed.