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35251 results about "Graphene" patented technology

Graphene (/ˈɡræfiːn/) is an allotrope of carbon in the form of a single layer of atoms in a two-dimensional hexagonal lattice in which one atom forms each vertex. It is the basic structural element of other allotropes, including graphite, charcoal, carbon nanotubes and fullerenes. It can also be considered as an indefinitely large aromatic molecule, the ultimate case of the family of flat polycyclic aromatic hydrocarbons.

Process for producing nano graphene reinforced composite particles for lithium battery electrodes

A process for producing solid nanocomposite particles for lithium metal or lithium ion battery electrode applications is provided. In one preferred embodiment, the process comprises: (A) Preparing an electrode active material in a form of fine particles, rods, wires, fibers, or tubes with a dimension smaller than 1 μm; (B) Preparing separated or isolated nano graphene platelets with a thickness less than 50 nm; (C) Dispersing the nano graphene platelets and the electrode active material in a precursor fluid medium to form a suspension wherein the fluid medium contains a precursor matrix material dispersed or dissolved therein; and (D) Converting the suspension to the solid nanocomposite particles, wherein the precursor matrix material is converted into a protective matrix material reinforced by the nano graphene platelets and the electrode active material is substantially dispersed in the protective matrix material. For a lithium ion battery anode application, the matrix material is preferably amorphous carbon, polymeric carbon, or meso-phase carbon. Such solid nanocomposite particles provide a high anode capacity and good cycling stability. For a cathode application, the resulting lithium metal or lithium ion battery exhibits an exceptionally high cycle life.

Graphene-based transistor

A graphene layer is formed on a surface of a silicon carbide substrate. A dummy gate structure is formed over the fin, in the trench, or on a portion of the planar graphene layer to implant dopants into source and drain regions. The dummy gate structure is thereafter removed to provide an opening over the channel of the transistor. Threshold voltage adjustment implantation may be performed to form a threshold voltage implant region directly beneath the channel, which comprises the graphene layer. A gate dielectric is deposited over a channel portion of the graphene layer. After an optional spacer formation, a gate conductor is formed by deposition and planarization. The resulting graphene-based field effect transistor has a high carrier mobility due to the graphene layer in the channel, low contact resistance to the source and drain region, and optimized threshold voltage and leakage due to the threshold voltage implant region.

Carbon/silicon/carbon nano composite structure cathode material and preparation method thereof

InactiveCN102214817AControllable GeometrySimple processCell electrodesCarbon compositesGas phase
The invention discloses a carbon/silicon/carbon nano composite structure cathode material and a preparation method thereof, belonging to the technical field of electrochemical power supply technologies. The cathode material consists of a carbon-based conductive substrate, nano silicon and a nano carbon coating layer, wherein the nano silicon is uniformly distributed on the carbon-based conductive substrate; the nano carbon coating layer is arranged on the surface of the nano silicon; the carbon-based conductive substrate is porous carbon, a carbon nanotube or graphene; the nano silicon exists in the state of nanoparticles or nano films; the weight percentage of the nano silicon in the cathode material is 10-90 percent; and the thickness of the nano carbon coating layer is 0.1-10 nanometers. The preparation method comprises the following steps of: depositing nano silicon on the carbon substrate in a reaction space in oxygen-free atmosphere by adopting a chemical vapor deposition process; and coating nano carbon on the surface of the nano silicon by adopting the chemical vapor deposition process. In the obtained carbon/silicon/carbon composite cathode material, the volume change of a silicon electrode material is controlled effectively in the charging and discharging processes, the electrode structure is kept complete, the circulation volume is large, the circulation service life is long, and the electrochemical performance is high.

General electronic paste based on graphene filler

The invention discloses general electronic paste based on graphene filler. The electronic paste contains graphene-containing conductive filler, an organic carrier, a solvent and an auxiliary agent. Because the graphene has good electronic conductivity and a unique two-dimensional laminar nano structure, the graphene forms a conductive network in the organic carrier more easily, and the electric conductivity of the electronic paste is improved by adding the graphene. Further, the conductive filler also contains a conductive material with relatively high electric conductivity, so that the electric conductivity of the electronic paste is further improved. Because the graphene and the conductive material are compounded to form the conductive filler, the electronic paste has good electric conductivity. The electronic paste can obtain a relatively wide electric conductivity range by changing the category of the conductive material mixed with the graphene and adjusting the relative proportion of the graphene to the conductive material of different category. The electric conductivity of the electronic paste is 1*10<-3>S / cm to 1*10<3>S / cm. The paste can be widely applied, and can be particularly used as a conductive coating or adhesive.

Secondary lithium ion battery containing a prelithiated anode

The present invention provides a lithium ion battery that exhibits a significantly improved specific capacity and much longer charge-discharge cycle life. In one preferred embodiment, the battery comprises an anode active material that has been prelithiated and pre-pulverized. This anode may be prepared with a method that comprises (a) providing an anode active material (preferably in the form of fine powder or thin film); (b) intercalating or absorbing a desired amount of lithium into the anode active material to produce a prelithiated anode active material; (c) comminuting the prelithiated anode active material into fine particles with an average size less than 10 μm (preferably <1 μm and most preferably <200 nm); and (d) combining multiple fine particles of the prelithiated anode active material with a conductive additive and / or a binder material to form the anode. Preferably, the prelithiated particles are protected by a lithium ion-conducting matrix or coating material. Further preferably, the matrix material is reinforced with nano graphene platelets.

Nano-scaled graphene plate films and articles

Disclosed is a nano-scaled graphene article comprising a non-woven aggregate of nano-scaled graphene platelets wherein each of the platelets comprises a graphene sheet or multiple graphene sheets and the platelets have a thickness no greater than 100 nm (preferably smaller than 10 nm) and platelets contact other platelets to define a plurality of conductive pathways along the article. The article has an exceptional thermal conductivity (typically greater than 500 Wm−1K−1) and excellent electrical conductivity (typically greater than 1,000 S / cm). Thin-film articles of the present invention can be used for thermal management in micro-electronic devices and for current-dissipating on an aircraft skin against lightning strikes.

Graphene conductive ink and preparation method thereof

The invention relates to graphene conductive ink comprising the following components by weight percent: 0.01-25% of resin, 0.1-95% of graphene, 0.1-30.0% of assistant, and 5.0-99.79% of solvent. The two-dimensional conductive material graphene is used for the conductive ink; the graphene with special ratio is adopted as a conductive phase; the resin is taken as a binder; the assistant and the solvent are used for assisting; the prepared ink is good in anti-sedimentation property, and adjustable in viscosity and rheological behavior, and can be used for flexibly printing on the surfaces of a plurality of substrates; and the ink is stable in mechanical property, stable in electrical properties, oxidation resistance, acid resistance, alkali resistance and resistance to a chemical solvent after being cured.
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