555results about How to "Good electron transport properties" patented technology

The invention discloses a carbon-silicon composite negative electrode material of a lithium ion battery and a preparation method of the carbon-silicon composite negative electrode material. The negative electrode material is prepared by coating the surface of a single silicon particle with a uniform carbon-cladding layer, an impurity-element-doped carbon-cladding layer or a porous carbon-cladding layer. By adopting a hydrothermal method and subsequent calcining method, environmental friendliness can be achieved, the procedure is simple and easiness in operation can be realized; the silicon and a resilient carbon carrier form a composite material, the electrochemical performance of the silicon material can be improved through the complementary advantages under the synergistic effect of carbon and silicon components, and the primary charging-discharging efficiency and the cycling stability can be improved. The prepared silicon-carbon composite negative electrode material of the lithium ion battery has the advantages of high specific capacity, good cycling stability, safety, no pollution and the like, and an effective way is provided for the research of a high-capacity lithium ion battery.

Provided are a novel nitrogen-containing heterocyclic derivative having a specific structure and an organic electroluminescence device having an organic thin film layer composed of one or a plurality of layers including at least a light emitting layer and interposed between a cathode and an anode, in which at least one layer of the organic thin film layer contains the nitrogen-containing heterocyclic derivative alone or as a component of a mixture. As a result, a novel nitrogen-containing heterocyclic derivative useful as a component of an organic electroluminescence device can be provided, and an organic electroluminescence device being driven at a low voltage and having high luminous efficiency, excellent electron transporting property, and high emission luminance can be realized by using the nitrogen-containing heterocyclic derivative in at least one layer of its organic thin film layer.

The invention provides a perovskite thin-film solar cell with a three-dimensional ordered mesopore support layer. The perovskite thin-film solar cell with the three-dimensional ordered mesopore support layer comprises a transparent conducting substrate, a compact layer, the three-dimensional ordered mesopore support layer, a perovskite light absorbing layer, a hole transporting layer and a counter electrode layer which are sequentially laminated to form a laminating layer, wherein the three-dimensional ordered mesopore support layer is filled with the perovskite light absorbing layer, the hole transporting layer and the counter electrode layer; the three-dimensional ordered mesopore support layer is of a three-dimensional ordered mesopore material prepared by using water-soluble colloidal crystal microspheres as a template; the aperture dimension of the three-dimensional ordered mesopore support layer depends on the dimension of the water-soluble colloidal crystal microspheres; and the perovskite light absorbing layer is prepared through materials of an ABXmY3-m type crystal structure. The perovskite thin-film solar cell has the advantages that the three-dimensional ordered mesopore support layer of which the aperture is uniform and adjustable, the specific surface area is relatively large and a good electronic transmission channel is arranged is provided and reaches high photoelectric conversion efficiency and outstanding repeatability and stability; and the preparation method has the advantages that the conditions are mild and controllable, the preparation method is simple and needs a little cost, and large-scale commercial production can be popularized.

The invention discloses a porous carbon membrane for lithium-sulfur batteries and an application of the porous carbon membrane in the lithium-sulfur batteries. According to the porous carbon membrane for the lithium-sulfur batteries, the porous carbon membrane is prepared through subjecting an organic membrane or organic-inorganic composite membrane, which is prepared from organic macromolecular resin, a mixture of organic macromolecular resin and inorganic nanoparticles, a mixture of organic macromolecular resin and an organic complex or a mixture of organic macromolecular resin and a powder carbon material, to preoxidation, programmed heating carbonization and template etching. The porous carbon membrane serves as a positive pole material of the lithium-sulfur batteries and has unapproachable advantages in the aspects of pole preparation process, raw material utilization factor, conductivity, pole composition structure and quality, and the like, thereby having a good application prospect.

The invention provides a process for producing a layer of a semiconductor material, wherein the process comprises: a) disposing on a substrate: i) a plurality of particles of a semiconductor material, ii) a binder, wherein the binder is a molecular compound comprising at least one metal atom or metalloid atom, and iii) a solvent; and b) removing the solvent. The invention also provides a layer of semiconductor material obtainable by this process. In a preferred embodiment, the particles of a semiconductor material comprise mesoporous particles of the semiconductor material or mesoporous single crystals of the semiconductor material. The invention provides a process for producing a compact layer of a semiconductor material, wherein the process comprises: disposing on a substrate i) a solvent, and ii) a molecular compound comprising at least one metal or metalloid atom and one or more groups of formula OR, wherein each R is the same or different and is an unsubstituted or substituted C1-C8 hydrocarbyl group, and wherein two or more R groups may be bonded to each other; and b) removing the solvent. The invention also provides a compact layer of a semiconductor material obtainable by this process. These processes can be effectively performed at temperatures of less than 300° C. Further provided are semiconductor devices comprising either a layer of a semiconductor material or a compact layer of a semiconductor material obtainable by the processes of the invention. The invention also provides a process for producing a semiconductor device.

The invention discloses a method for electro-chemical compounding of graphene and metallic oxide. The method comprises the following steps of: (1) adding a graphite flake as a positive electrode and a platinum sheet as a negative electrode into an electrolyte solution; (2) adding variational voltage for 1-60 minutes between the positive electrode and the negative electrode; and (3) centrifuging, washing and carrying out vacuum drying to obtain a compound of the graphene and the metallic oxide. The compound material of the graphene and the metallic oxide, prepared by the method, has excellent electrical transmission performance and excellent performances, can serve as a lithium ion battery cathode material and a photocatalytic-degraded organic pollutant material and is simple to operate and suitable for large-scale industrial production.

The invention relates to a copper-iron layered double metal hydroxide, a copper-iron layered double metal hydroxide / carbon based composite material as well as preparation methods and application of the copper-iron layered double metal hydroxide and the composite material. The preparation method of the copper-iron layered double metal hydroxide includes the following steps: (1) dissolving a metal copper salt and a metal iron salt into deionized water to obtain a mixed solution; and (2) adding an alkaline reagent into the mixed solution, adjusting the pH to 5-7, and performing aging at 60-130 DEG C for 20-80 h to obtain the copper-iron layered double metal hydroxide.

The invention relates to a carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and a preparation method of the electrocatalyst. A carbon-supported metal precursor is prepared through in-situ growth by using a transition metal-catalyzed carbon material, then phosphorization is conducted on the metal precursor so as to obtain the carbon-supported transition metal phosphide electrocatalyst for hydrogen generation. In the electrochemical hydrogen generation reaction, only overpotentials of 49 and 130 mV are required by the prepared carbon-supported iron phosphide (FeP / Fe@NC) when the current density is 10 and 100 mA / cm<2>, and meanwhile the catalyst has excellent stability without deactivation for 90 hours or above at a current density of 10 mA / cm<2>. The preparation method is simple and easy, the required raw materials are cheap and easily available, and high binding between the catalyst and the carbon carrier and excellent dispersibility of the catalyst can be ensured, so that the catalyst has good conductivity and electron transport characteristics.

The invention relates to a nickel-cobalt lithium manganate positive material, a preparation method thereof and a lithium ion battery. The nickel-cobalt lithium manganate positive material comprises monocrystal nickel-cobalt lithium manganate and a coating layer coated on the surface of the monocrystal nickel-cobalt lithium manganate, and the coating layer consists of lithium vanadium phosphate anda carbon material. Compared with the prior art, the lithium vanadium phosphate and the carbon material are coated on the surface of the monocrystal nickel-cobalt lithium manganate to form a compositematerial, good ion transport performance of lithium vanadium phosphate is combined with preferable electron transport performance of carbon, the electrochemical activity of the monocrystal material is improved, and the gram volume and rate capability of the monocrystal nickel-cobalt lithium manganate positive material are improved greatly.

An organic light-emitting device includes a first electrode; a second electrode; and an organic layer interposed between the first electrode and the second electrode, the organic layer including one or more anthracene derivative compounds represented by Formula 1 below and optionally an ionic metal complex:wherein R1 and R2 are each independently a hydrogen atom, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C4-C30 heteroaryl group, a substituted or unsubstituted C6-C30 condensed polycyclic group, a hydroxyl group, halogen, a cyano group, or a substituted or unsubstituted amino group.