1060 results about "Electro conductivity" patented technology

Provided is lithium secondary battery comprising a cathode, an anode, and an electrolyte or separator-electrolyte assembly disposed between the cathode and the anode, wherein the anode comprises: (a) a foil or coating of lithium or lithium alloy as an anode active material; and (b) a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 5%, a lithium ion conductivity no less than 10⁻⁶ S/cm at room temperature, and a thickness from 1 nm to 10 μm, wherein the high-elasticity polymer contains an ultrahigh molecular weight polymer having a molecular weight from 0.5×10⁶ to 9×10⁶ g/mole and is disposed between the lithium or lithium alloy and the electrolyte or separator-electrolyte assembly.

The invention discloses a preparation method of an all-solid polymer electrolyte through in-situ ring opening polymerization of an epoxy compound, and an application of the all-solid polymer electrolyte in an all-solid battery. The preparation method is characterized in that a liquid-state epoxy compound, a lithium salt, a battery additive and the like are employed as precursors and are injected into between a positive pole sheet and a negative pole sheet of the battery, and under a heating condition, in-situ polymerization solidification is carried out to form the all-solid polymer electrolyte, and furthermore, the all-solid battery is produced. The ionic conductivity at room temperature of the all-solid polymer electrolyte can reach from 1*10<-5> S/cm to 9*10<-3> S/cm and electric potential window is 3.5-5 V. The all-solid polymer electrolyte is prepared through the in-situ copolymerization method, so that the all-solid polymer electrolyte has excellent contact with electrodes, thereby greatly improving interface compatibility of the solid-state battery, reducing interface wetting and modification steps of the solid-state battery, reducing production cost of the solid-state battery and improving performances of the solid-state battery. The invention also discloses an all-solid polymer lithium battery assembled from the all-solid polymer electrolyte.

The invention discloses a thick electrode with a good electrochemical performance. The electrode comprises a current collector and an electrode membrane containing active substances and conductive substances. With a thickness greater than 300 micrometers, the electrode membrane includes an internal membrane layer close to the current collector and an external membrane layer far from the current collector. The conductivity of the electrode membrane decreases from the internal membrane layer to the external membrane layer, while the porosity of the electrode membrane increases from the internal membrane layer to the external membrane layer. The internal membrane layer has great conductivity which can make electrons at the current collector entering or separating from the internal membrane layer rapidly. With great porosity, the external membrane layer can adsorb a lot of electrolyte, thus solving the problem of poor electrolyte wettability of thick electrodes. In addition, the invention also discloses a preparation method of a thick electrode with a good electrochemical performance.

The invention relates to a high-strength and high-conductivity dispersion-strengthened alloy, which comprises a copper base, a ceramic dispersion-strengthening phase and a doping element, wherein the ceramic dispersion-strengthening phase may be one or several of ZrO2, Y2O3, MgO, Al2O3 and TiB2 which accounts for 0.1 to 2 mass percent of the copper alloy; and the doping element may be one or several of Ni, Y, Ag, Ti, Zr and Hf which accounts for 0.1 to 1 percent of the copper alloy. In the invention, the problems of ceramic particle agglomeration caused by low bonding performance of the copper and ceramic interface, the roughening of the ceramic particles in sintering and material conductivity reduction caused by the scattering of electrons at the copper and ceramic interface are solved, and the dispersion-strengthened alloy with higher hardness and higher conductivity is obtained. The invention also relates to a preparation method of the high-strength and high-conductivity dispersion-strengthened alloy.

The invention discloses an all-solid polymer electrolyte, and a preparation method and an application of the all-solid polymer electrolyte, and belongs to the field of lithium ion batteries. The all-solid polymer electrolyte comprises polyethylene oxide, lithium salt, inorganic nano particles and ion liquid, wherein a mass ratio of the lithium salt to polyethylene oxide is 0.1-0.5; the mass sum of the inorganic nano particles and the ion liquid is 10-30% of the mass of the all-solid polymer electrolyte; the lithium salt comprises one or several of bistrifluoromethane sulfonimide lithium salt, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium trifluoromethanesulfonate and lithium bis borate; and the inorganic nano particles comprise one or several of nano aluminum oxide, nano silicon oxide, nano zirconium oxide and nano barium titanate. The all-solid polymer electrolyte has better mechanical strength and higher ion conductivity. The method is simple in technology and low in cost; and raw materials are easy to obtain.

The invention belongs to the field of lithium batteries, and relates to an inorganic/organic composite porous lithium battery diaphragm and a preparation method thereof. The inorganic/organic composite porous lithium battery diaphragm comprises a base material layer and an inorganic/organic composite porous diaphragm layer arranged on the surface of the base material layer, wherein the base material layer adopts polypropylene non-woven fabrics; the inorganic/organic composite porous diaphragm layer adopts a polyvinylidene fluoride- hexafluoropropylene multipolymer containing inorganic nano grains and hydrophilizing agents; and the inorganic nano grains are silicon dioxide nano grains or coupling agent improved silicon dioxide nano grains. The inorganic/organic composite porous lithium battery diaphragm provided by the invention has the advantages that the production cost of the lithium battery diaphragm is lowered while high ion-conductivity, excellent electrochemical performance, high mechanical strength and low thermal shrinking percentage are ensured.

The invention discloses a three-layer composite wave-absorbing film and a preparation method thereof. The three-layer composite wave-absorbing film consists of an impedance matching layer, an absorption layer and a reflection layer, wherein the impedance matching layer consists of a dielectric material and an organic carrier; the absorption layer consists of magnetic particles and the organic carrier; the reflection layer consists of a carbon material with better electro-conductivity and the organic carrier; the thickness of the impedance matching layer is 0.1 to 0.3 millimetre (mm); the thickness of the absorption layer is 0.2 to 0.4 mm; and the thickness of the reflection layer is 0.1 to 0.3 mm. The preparation method of the three-layer composite wave-absorbing film comprises the following steps of: firstly, processing organic particles; secondly, uniformly dispersing the organic particles in an organic phase in a certain mode, and spreading to form a film; and finally, after a solvent of a first layer is completely volatilized, spreading a second layer and a third layer to form the three-layer composite wave-absorbing film. The three-layer composite wave-absorbing film has the advantages of high efficiency, light weight and low thickness, can be applied to electromagnetic shielding materials, and has a wide application prospect in ultra-thin radar wave-absorbing materials.

The invention relates to a method for preparing a nano-sulfur / graphene oxide composite material with high specific capacity and belongs to the field of cross application of material synthesis and electrochemical power supplies. The nano-sulfur / graphene oxide composite material is applicable to an electrode material of a lithium sulfur secondary battery with the high specific capacity. The method is characterized by comprising the following steps of: synthesizing nano-sulfur particles by using a simple chemical method under the protection of a surfactant; and uniformly attracting graphene oxide and a carbon material to the surfaces of the nano-sulfur particles by interaction of the surfactant and the graphene oxide to form a core-shell type nano-sulfur / graphene oxide composite material. The graphene oxide and the carbon material coat a sulfur surface, so a sulfur electrode material is stable in structure, high in electric conductivity and high in cycle performance. Environmentally-harmful materials are not employed, and the method can be implemented at low temperature, and is low in energy consumption in the synthesis process and low in equipment requirement. The synthesized material is high in charging/discharging capacity, non-toxic and harmless to a human body, and sulfur is abundant in nature, so the material has a good industrial prospect and can be applied to large-scale industrial production.

Belonging to the technical field of chemical material preparation, the invention relates to a preparation method of a Co3O4/graphene nanocomposite material. The method provided in the invention is characterized by: first employing a simple chemical method to synthesize Co3O4 nanoparticles under the protection of a surfactant, then adsorbing oxidized graphene on surfaces of the Co3O4 nanoparticles uniformly by means of the interaction between the surfactant and the oxidized graphene, and reducing the oxidized graphene, thus forming the uniform Co3O4/graphene nanocomposite material. Good electrical conductivity is achieved among Co3O4 nanoparticles through graphene, so that the electroconductibility of the composite material can be improved. The Co3O4 nanoparticles in the composite material have a size of 50-100 nanometers, and account for 60%-95% by weight. The method provided in the invention does not involve environmentally harmful materials, and the process is simple, practicable and easy to operate. The prepared Co3O4/graphene nanocomposite material has high specific capacity and capacitance, as well as good cycle performance, thus having good application prospects in the fields of lithium ion batteries and supercapacitors.

A light emitting device 100 of the invention is the one using a first main surface of a compound semiconductor layer portion, having a light emitting layer section 24 therein, as a light extraction surface, and having, on the second main surface side of the compound semiconductor layer, a device-substrate 7 bonded thereto while placing, in between, a main metal layer 10 having a reflective surface reflecting light from the light emitting layer section 24 towards the light extraction surface side, and is characterized in that the device-substrate 7 is composed of a Si substrate having a conductivity type of p type, and that the device-substrate 7 has, as being formed on the main surface thereof on the main metal layer 10 side, a contact layer 31 having Al as a major component. With respect to light emitting devices configured as having a structure in which a light emitting layer section and a device-substrate are bonded while placing a metal layer in between, the invention is successful in providing a light emitting device having a desirable electro-conductivity, and a method of fabricating the same.

The invention discloses application of a high ionic conductivity solid electrolyte layer in an all-solid-state lithium ion battery. An assembling step of the battery comprises the following steps: cutting a composite positive electrode and a composite negative electrode which are coated with films, uniformly coating the composite positive electrode or the composite negative electrode with electrolyte slurry, laminating the composite positive electrode and the composite negative electrode, drying the electrodes by blast air, then drying the electrodes in vacuum, baking the electrodes, welding tabs, performing vacuum packaging and cold-thermal pressing to realize close connection between electrolyte layers, and completing preparation of the all-solid-state lithium ion battery. The application has the advantages that the surfaces of the composite positive and negative electrodes are coated with the high ionic conductivity solid electrolyte layer and then are dried and sliced, and the surface of the cut composite positive electrode or composite negative electrode is uniformly coated with the electrolyte layer; before baking, the positive and negative electrodes are assembled, then dried by the blast air and assembled into the battery; and by twice coating of the electrolyte slurry, the problem of a micro short circuit of the full-solid-state battery and the problem of a relativelyhigh interface impedance between the electrolyte and composite positive and negative pole pieces as well as between one electrolyte layer and the other electrolyte layer can be effectively solved.

The invention discloses a composite all solid-state polymer electrolyte lithium ion battery and a preparation method of the composite all solid-state polymer electrolyte lithium ion battery, and belongs to the all solid-state polymer electrolyte preparation technology and the lithium ion battery field. The composite all solid-state polymer electrolyte lithium ion battery disclosed by the invention comprises a battery case and an electrode core, wherein the electrode core is accommodated in the battery case in a sealed way and comprises a positive electrode, a negative electrode and composite all solid-state polymer electrolytes positioned between the positive electrode and the negative electrode, and the composite all solid-state polymer electrolytes comprise dimethyl siloxane-ethylene oxide copolymers, lithium salts and nanometer inorganic fillers. Compared with the existing composite all solid-state polymer electrolytes, the composite all solid-state polymer electrolytes adopted by the invention have the advantages that base materials are the dimethyl siloxane-ethylene oxide copolymers, the regularity of the polymer chain segment is reduced, and the crystallization degree of the polymers at the surface is reduced, so higher ionic conductivity is realized at normal temperature.

On the one hand is provided an electric heating element (15, 31) consisting of a semiconducting ceramic (28, 32) as well as a method for its production. The semiconducting ceramic material may be porous or foamed to thus contain pores (29, 34) open outwardly. The pores are attainable by admixing filler bodies, which dissolve during sintering, to the starting material or by impreganting a textile substrate material (36) with a ceramic material. Due to the porosity of the heating element (15, 31) an increased radiant surface area is attained. On the other hand is provided an electric heating element (115, 132, 145, 150, 158, 160, 162) as well as a method for its production which consists of semiconducting ceramic and comprises a negative temperature coefficient of the electrical resistance. The temperature coefficient is negative throughout over the full operating temperature range. The material suitable for the heating element (115, 132, 145, 150, 158, 160, 162) is doped silicon carbide or TiN. One such heating element (115, 132, 145, 150, 158, 160, 162) may be put to use, for example, rod-shaped in a radiant heater body (111) or foil-shaped at the underside of a surface element (30) of a cooktop (31). The electric conductivity of the material of the heating element (115, 132, 145, 150, 158, 160, 162) can be adjusted by nitrogen absorption during annealing in a nitrogen atmosphere subsequent to the sintering process.

The invention discloses a washing machine which comprises a tank, a washing tub, a motor, a detergent storage tank, a detergent put-in device, a turbidity sensor, a conductivity sensor and a controller. The detergent put-in device is used for putting detergent agent in the detergent storage tank into the washing tub according to detergent put-in amount signals. The turbidity sensor is used for detecting the after-pre-washing turbidity of washing water in the washing tub to obtain a first turbidity value and detecting the after-rinsing-suspension turbidity of washing water to obtain a second turbidity value. The conductivity sensor is used for detecting an after-rinsing-suspension conductivity value of washing water. The controller is used for controlling pre-washing, generating the detergent put-in amount signals according to the first turbidity value and controlling rinsing according to the second turbidity value and the conductivity value. By means of the washing machine, stains on clothes can be reduced, and clothes can be cleaner after being washed and rinsed. The invention further discloses a control method of the washing machine.

The invention relates to the technical field of electrolyte for power lithium ion batteries, and in particular relates to low-temperature electrolyte for a ternary power lithium ion battery. The low-temperature electrolyte is characterized by consisting of lithium salt, an organic solvent and an additive, wherein the organic solvent accounts for 85% to 97% in mass percent while the additive accounts for 3% to 15% in mass percent; and the lithium salt is added to ensure that the concentration of the lithium salt of the electrolyte is 0.6 to 1.5 mol/L. The preparation method comprises the following steps of: adding the organic solvent with water content lower than 10ppm into a fluorinated bottle according to a proportion under the protection of dry inert gas for performing molecular sieve dehydration treatment, uniformly stirring the organic solvent until the water content of the organic solvent is 0 to 10ppm, adding the additive and the lithium salt according to set proportions into the uniformly stirred organic solvent, and uniformly stirring the three materials to obtain the required low-temperature electrolyte, wherein the temperature in an operation process is controlled to range from 8 to 12 DEG C. The electrolyte is low in melting point and viscosity and wide in temperature window range, has high electric conductivity at room temperature to -40 DEG C, and can be applied to the use of the ternary power lithium ion battery under a low-temperature condition.

Disclosed herein is an electro-conductive thermoplastic resin composition with controllable superior electro-conductivity and excellent impact resistance. The electro-conductive thermoplastic resin composition comprises 80 to 99.7 parts by weight of a thermoplastic resin, 0.1 to 5 parts by weight of a carbon nanotube, 0.1 to 5 parts by weight of an impact modifier, and 0.1 to 10 parts by weight of a hydrophobic polymer additive, based on a total of 100 parts by weight of the electro-conductive thermoplastic resin composition.

The invention provides a lithium battery graphene conductive paste. The lithium battery graphene conductive paste is characterized by consisting of 10 to 15 parts of graphite power, 0.5 to 2 parts of active agent, 0.5 to 1 part of dispersing agent, 0.2 to 0.3 parts of colloid material, 0.1 to 0.5 parts of carbon nano tube, 0.01 to 0.1 part of accelerant, 85 to 90 parts of solvent, and moderate viscosity modifier. By refining and activating graphite and further dispersing, grinding and stripping the graphite, and under the action of shear force and friction force of a grinding unit, a micron-grade accelerant is used as a micro force transfer medium, so that the graphite is stripped into the graphene, and meanwhile, the micron-grade accelerant, the graphene and the carbon nano tube are interweaved by the colloid material in the grinding process to form a composite micro colloidal particle; the composite micro colloidal particle has an excellent dispersibility in lithium battery anode and cathode active materials, so that the charge discharge efficiency of the active materials is substantially improved; and besides, the composite micro colloidal particle is compounded with the graphene and used for a lithium battery conductive agent, thus the carrier concentration can be remarkably improved, and the conductivity and discharge capacity of the battery active materials can be improved.

The invention discloses a silver copper oxide/copper composite electrical contact material and a preparation process thereof. The process comprises the following steps: mixing silver and copper according to certain proportions, and then, smelting the mixture in an intermediate frequency furnace; then, carrying out alloy atomization by using high pressure water atomizing equipment; baking after atomization to obtain powder; screening; putting the screened powder into an internal oxidization furnace for oxidizing at certain temperature and oxygen pressure; carrying out isostatic cool pressing after oxidization to form a billet; sintering and extruding to form a plate; and then, carrying out composite rolling with copper to obtain a finished product. Because the formula and process disclosed by the invention are reasonable, the produced electrical contact has the characteristics of high conductivity, uniform and fine tissue, high bonding strength between a working layer and a welding layer, fusion welding resistance, electrical arc erosion resistance and the like.

An electrode array, a system and a method for reconstructing the distribution of electrical properties within a multi-material object. One embodiment includes electrodes arranged along a three-dimensional helical path to provide one or more helical arrays and circuitry to measure signals for calculating a conductivity or admittivity distribution representative of the interior of the structure. Image data may be obtained which is representative of the multi-material region.

The invention provides a solid electrolyte material, a preparation method thereof and a solid-state lithium battery. The chemical formula of the solid electrolyte material is LiaMX<3+> a-yX'y, wherein1.5 < = a < = 4.5, 0 < y < = 3.0, M is one of rare earth elements La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y and Sc, X is one of Cl, Br and I, and X' is at least one of F, Cl and Br'. The invention provides a solid electrolyte material. By doping halogen anions, the electrochemical stability is effectively improved, the ionic conductivity is further effectively improved after cation doping, the material can be compatible with a commercial positive electrode material, the material can be applied to an all-solid-state lithium secondary battery, a battery with high safety andrelatively high chemical stability and electrochemical stability can be obtained, and the application prospect is wide.

The invention belongs to the technical field of batteries, in particular to an integrated all-solid-state lithium metal battery, including the positive electrode, a negative electrode and an organic-inorganic composite solid electrolyte disposed between the positive electrode and the negative electrode, the negative electrode is made of metal lithium, the organic-inorganic composite solid electrolyte comprises polyethylene oxide, an electrolyte and ceramic nanowires uniformly dispersed in the polyethylene oxide, and an adhesive in the positive electrode comprises a mixture of the polyethyleneoxide and the electrolyte. Compared with the prior art, the organic-inorganic composite solid electrolyte with high ionic conductivity and high mechanical strength can be obtained by uniformly dispersing ceramic nanowires in polyethylene oxide (PEO); Furthermore, the binder in the cathode contains the mixture of polyethylene oxide and electrolyte, which effectively ensures the ion transport in the cathode and the good contact of the interface, so as to obtain the integrated all-solid-state lithium metal battery with high safety and excellent electrochemical performance.

The invention provides a metal/graphene composite material and a preparation method as well as application thereof. The metal/graphene composite material comprises a core, a shell and nanoparticles, wherein the shell wraps the outer side of the core; the nanoparticles are compounded on the surface of the shell; the core is micron-sized metal powder; the micron-sized metal powder is selected from one or more of micron-sized copper powder, micron-sized nickel powder, micron-sized zinc powder, micron-sized silver powder and micron-sized tin powder; the shell is graphene; the nanoparticles are selected from one or more of nano-scale copper powder, nano-scale nickel powder, nano-scale zinc powder, nano-scale silver powder and nano-scale tin powder. A functional material which is prepared by sintering the metal/graphene composite material and the copper powder meanwhile has good conductivity and higher bonding strength; the electrical conductivity of the composite material provided by the invention is more than 85 percent of that of a pure copper material, and the tensile strength is more than 500 MPa and is far higher than the tensile strength of the pure copper material.

The invention relates to a copper-clad aluminum alloy composite conducting wire and a preparation method thereof. The copper-clad aluminum alloy composite conducting wire comprises the following elements in percentage by mass: 0.5 to 1.0 percent of iron (Fe), 0.05 to 0.15 percent of magnesium (Mg), 0.15 to 0.3 percent of copper (Cu), 0.02 to 0.06 percent of boron (B), less than 0.1 percent of silicon (Si) and other impurities, wherein the sum of the contain percentage of manganese (Mn), chromium (Cr) and vanadium (V) in the impurities is less than or equal to 0.05 percent. The preparation method comprises the following steps of continuously extruding aluminum alloy wire poles at low temperature under the horizontal continuous casting by a cladding welding method; directly cladding copper layers outside the aluminum wire poles; and thus preparing the high-strength and high-conductivity copper-clad aluminum alloy composite conducting wire by a multi-stage cold drawing process and a finished product annealing process. The copper-clad aluminum alloy composite conducting wire has the advantages that the mechanical properties and the electric properties of the copper-clad aluminum alloy composite conducting wire are better than those of the conventional copper-clad aluminum and copper-clad aluminum magnesium alloy wires, and the copper-clad aluminum alloy composite conducting wire has the characteristics of high yield, low production cost and the like.

The invention provides 80-100mm hardenability aluminium alloy with the super strength of 690-730Mpa and a preparation method thereof. The 80-100mm hardenability aluminium alloy is characterized by mainly comprising aluminum, zinc, magnesium, copper, zirconium and strontium, wherein the mass percent of the zinc is 10.78-13.01%, the mass percent of the magnesium is 2.78-3.51%, the mass percent of the copper is 2.26-2.80%, the mass percent of the zirconium is 0.204-0.24%, the mass percent of the strontium is 0.0025-0.0751%, and the rest is aluminium and few impurity elements. The preparation method comprises the following steps: (1) casting; (2) carrying out homogenizing annealing (400 DEG C*6h+420 DEG C*6h+440 DEG C*6h+460 DEG C*12h); (3) carrying out hot extrusion (the extrusion ratio is 12); (4) carrying out solution treatment (450 DEG C*2h+460 DEG C*2h+470 DEG C*2h); and (5) carrying out aging treatment (121 DEG C*24h). The aluminium alloy has the advantages that the crystal particles of the aluminium alloy are very small (the average crystal particle size is less than 10 micrometers), the highest actual measurement strength of the aluminium alloy can reach 731 Mpa, meanwhile, the percentage of elongation of the aluminium alloy is 6.6%, the hardness of the aluminium alloy is 231.1HV, the electrical conductivity of the aluminium alloy is 25.9% IACS (International Annealed Copper Standard), and the end-quenching hardenability of the aluminium alloy in water is 80mm.

Electro-conductive fibers comprise synthetic fibers and an electro-conductive layer containing carbon nanotubes and covering a surface of the synthetic fibers, and the coverage of the electro-conductive layer relative to the whole surface of the synthetic fibers is not less than 60% (particularly not less than 90%). The electric resistance value of the electro-conductive fibers ranges from 1×10⁻² to 1×10¹⁰ Ω/cm, and the standard deviation of the logarithm of the electric resistance value is less than 1.0. The thickness of the electro-conductive layer ranges from 0.1 to 5 μm, and the ratio of the carbon nanotubes may be 0.1 to 50 parts by mass relative to 100 parts by mass of the synthetic fibers. The electro-conductive layer may further contain a binder. The electro-conductive fibers may be produced by immersing the synthetic fibers in a dispersion with vibrating the synthetic fibers to form the electro-conductive layer adhered to the surface of the synthetic fibers. The electro-conductive fibers have the carbon nanotubes homogeneously and firmly adhered to an almost whole of a surface thereof and have an electro-conductivity and a softness.

An electrolyte composition and a solid polymer electrolyte for electrical double-layer capacitors are endowed with high ionic conductivity. The invention is also directed at a polar electrode composition and a polar electrode having excellent binder capabilities which are able to strongly bond a high surface area material such as activated carbon and an electrically conductive material to a current collector, and which also have shape stability. A high-performance electrical double-layer capacitor arrived at using the above compositions and components is additionally disclosed.

The invention relates to a preparation method for graphene load flower-shaped porous nickel oxide composite materials. The preparation method is characterized in that graphene serves as a matrix, and flaky porous nickel oxide is assembled into flower-shaped nickel oxide balls and grows on the graphene matrix. The graphene serving as a matrix framework has good electric conductivity, the flower-shaped nickel oxide micro balls can achieve good electric conductivity through the graphene, and the appearance electric conductivity of the composite materials is improved. The width of a nickel oxide piece is 200-300 nm, the length of the nickel oxide piece is 400-600 nm, the thickness of the nickel oxide piece is 5-10 nm, mesopores of 2-10 nm are distributed in the flaky layer structure, and the diameter of the formed flower-shaped nickel oxide micro balls is 1-3 micrometers. The graphene load flower-shaped porous nickel oxide composite materials prepared through a hydrothermal method have the advantages of being large in specific surface area, high in single electrode capacity, good in cycle performance and the like, and suitable for supercapacitor electrode materials.

Disclosed is an electromagnetic continuous casting apparatus for a material having a low electric conductivity. The casting apparatus includes a crucible having a vertical axis. The crucible comprises an upper hot crucible and a lower cold crucible. The crucible is surrounded with an induction coil. The hot crucible is formed of a non-metallic material having a high electric conductivity and is not water-cooled. The cold crucible has a cooling structure and is formed of a metallic material having a high thermal conductivity and a high electric conductivity.

The invention discloses a silver-plated carbon fiber-enhanced carbon-based pantograph sliding plate. A preparation method of the silver-plated carbon fiber-enhanced carbon-based pantograph sliding plate comprises the steps that pretreating is conducted by taking carbon fiber cloth as a raw material, a chemical silver plating solution is added into the pretreated carbon fiber cloth, and a well-plated silver layer is obtained; the silver-plated carbon fiber cloth, a copper mesh, short-cut carbon fibers, modified phenolic resin, graphite, copper powder, butadiene-acrylonitrile rubber and the like form mixed materials, the mixed materials are subjected to compression molding treating, hot-press sintering and steeping re-pressing, and then the silver-plated carbon fiber-enhanced carbon sliding plate can be obtained. According to the silver-plated carbon fiber-enhanced carbon-based pantograph sliding plate, by adding enhancement bodies such as the silver-plated carbon fibers into the carbon-based sliding plate, the electrical conductivity and the heat conductivity of the sliding plate can be improved, the bonding property and the interface bonding strength between internal materials including the carbon fibers and other components of the sliding plate are improved, the self-lubricating property of the sliding plate is improved, the service performance of the pantograph sliding plate in a high speed railway is further enhanced, and the service life of the pantograph sliding plate is prolonged.

The invention discloses a high-conductivity polyimides-graphene composite material and a preparation method thereof. The preparation method comprises: taking polyimides microballoon subjected to none modification and graphene oxide as raw materials, firstly preparing a polyimides/graphene oxide core-shell composite microballoon, then employing a chemical reduction process to obtain a polyimides/reduced graphene oxide core-shell composite microballoon, and finally performing hot-pressing molding on the polyimides/reduced graphene oxide core-shell composite microballoon, so as to obtain the high-conductivity polyimides-graphene composite material. The preparation method is simple in technology, environment-friendly and free of pollution, and the prepared composite material is high in conductivity, and suitable for industrialized large-scale production.