3328 results about "High conductivity" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

Provided are: a multilayer carbon nanotube assembly having high conductivity and good dispersibility in a dispersion medium; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.　Provided are: a multilayer carbon nanotube assembly comprising multilayered carbon nanotubes having a maximum length of 1000-30000 μm and Fe atoms, wherein the content ratio of Fe atoms to the total mass of the assembly is 0.5% by mass or more and less than 10% by mass; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.

The invention discloses a preparation method of a high-compaction lithium manganese iron phosphate positive electrode material, which comprises the following steps: placing a manganese source, an iron source and a phosphorus source in deionized water, stirring, carrying out primary high-speed ball milling, carrying out constant-temperature water bath, adding an oxidizing agent, stirring and oxidizing, and drying the slurry to obtain manganese iron phosphate precursor powder; carrying out primary sintering on the ferromanganese phosphate precursor powder to obtain a ferromanganese phosphate primary sintering material; putting the ferromanganese phosphate primary sintering material into deionized water, adding a lithium source and a carbon source at the same time, and performing stirring, secondary high-speed ball milling and drying to obtain lithium ferromanganese phosphate precursor powder; and carrying out secondary sintering on the lithium manganese iron phosphate precursor powder to obtain the high-compaction lithium manganese iron phosphate positive electrode material. The void ratio is well reduced and good carbon coating is realized by means of secondary grinding and secondary sintering, and compared with the prior art, the method has the advantages that good capacity can be maintained, the powder compaction density of the material can be improved, the conductivity can be improved, and the specific surface area of the material can be effectively reduced.

The invention discloses a single-end open type high-performance magnetic shielding system and a design method thereof. The system is formed by combining a passive magnetic shielding subsystem and an active magnetic compensation subsystem. The passive magnetic shielding subsystem is formed by alternately nesting single-end open type high-permeability and high-conductivity metal barrels, and the structure is beneficial to synchronously improving the shielding capability for full-band magnetic interference; the active magnetic compensation subsystem is composed of a group of axial nonlinear gradient coils, two groups of radial nonlinear gradient coils with orthogonal magnetic fields and a magnetic compensation control circuit, and three groups of magnetic compensation coil windings are obtained based on specific nonlinear distributed magnetic interference reverse design in a single-end open type magnetic shielding barrel; different from conventional shimming and linear gradient coils, accurate compensation of magnetic interference in a working area in the barrel can be realized. According to the invention, the shielding capability of the single-end open type magnetic shielding system is improved, and a required near-zero magnetic environment is provided for extremely weak magnetic measurement.

The invention discloses a conductivity measurement compensation method and system based on temperature field distribution modeling, and the method comprises the following steps: 1), building a to-be-measured medium temperature field model which is used for describing the temperature distribution in a medium; 2) establishing a conductivity temperature compensation model; 3) coupling the temperature field model and the conductivity temperature compensation model, and establishing a conductivity measurement compensation equation; 4) solving the conductivity measurement compensation equation to obtain compensated conductivity distribution; and 5) receiving data of the temperature sensor in real time, dynamically updating boundary conditions and initial conditions of the temperature field model, inputting temperature field distribution obtained by calculation into the conductivity compensation model, and compensating a conductivity measurement result in real time. According to the method, the influence of the temperature change on the conductivity is more accurately compensated by simulating the temperature distribution of the medium, the method adapts to the environment condition of rapid change, and the measurement precision of the conductivity can be obviously improved in the scene of large temperature gradient or rapid change.

A power connector system having a right-angle type plug connector or a straight type plug connector engageable with a header connector. The right-angle type plug connector is a plug connector having a mating direction, which is 90 degrees from the centerline of the cables exiting from the plug connector. The straight type plug connector is a plug connector having a mating direction, which is parallel to the centerline of the cables exiting the back of the plug connector. The header connector holds at least a female receiving terminal or receptacle made of a high electrical conductivity material. The female receiving terminal or receptacle includes fingers that extend parallel to each other, and are spaced apart from each other, and further includes a reinforcing spring member. The plug connector holds at least a male rectangular tab terminal, the male rectangular tab terminal having a short edge and a long edge. The female receiving terminal of the header connector may mate with either the short edge or the long edge of the male rectangular tab terminal of the plug connector. The other end of the male rectangular tab terminal includes a wire or a cable attached thereto via welding, mechanical crimp, or the like.

The invention relates to the field of super-hydrophobic materials, in particular to a basalt fiber composite material as well as a preparation method and application thereof. According to the composite fabric material provided by the invention, a multistage micro-nano rough surface of the MoS2 nanoflowers and the silver nanoparticles is constructed on the fiber substrate, so that not only is super-hydrophobic self-cleaning realized, but also the anti-icing performance is relatively high, and particularly, rapid heating is realized by combining broadband absorption of the MoS2 nanoflowers and a local surface plasma resonance effect of the silver nanoparticles; and meanwhile, the silver nanoparticles accelerate heat conduction, so that excellent ice melting capability is obtained. The high conductivity of the silver nanoparticles constructs a conductive path, and the layered structure of MoS2 triggers interface polarization, so that the electromagnetic shielding effectiveness of the X wave band is improved. The dual antibacterial mechanism of the MoS2 nanoflowers and the silver nanoparticles also realizes broad-spectrum efficient antibiosis, the preparation method is green and environment-friendly, the cost is low, and the requirements of complex scenes such as wearable electronic equipment, medical protection, polar region protection and national defense can be met.

A linear response stretchable resistance strain sensor belongs to the technical field of wearable sensors, is of a three-layer film structure and comprises a stretchable elastic substrate, a middle strain sensitive layer and a stretchable elastic package on the uppermost layer. The nano conductive material network bonded by the trace polymer not only has high conductivity close to that of a pure nano conductive material, but also enhances the mechanical stability of the conductive network. Uniform and random cracks are formed after primary stretching, and a stable structure similar to a plane spring is formed. The strain of the measured object drives the size of the air gap in the crack to change, and the conductive path is changed, so that the resistance is changed. The invention shows the detection capability of the sensor in a strain range of 0.001% to 100%, hysteresis (1.61%), linear response, fast enough reaction speed and extremely low residual resistance. The strain sensor also has stability, pressure insensitivity and waterproofness, and is suitable for long-term accurate monitoring of strain of soft systems such as biological tissues in the field of medical health.

The present application provides a battery cell, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a positive electrode sheet and an electrolyte solution. A coating mass of a positive electrode active material layer on a single side of the positive electrode sheet is 410 mg / 1540.25 mm2 to 550 mg / 1540.25 mm2, and a membrane resistance of the positive electrode sheet is ≥1Ω. A conductivity of the electrolyte solution is ≤14 mS / cm. The battery cell has thick coated electrode sheets, where the lower membrane resistance of the positive electrode sheet indicates its higher conductivity, which is conducive to reducing solid-state ohmic resistance of the battery cell. The higher conductivity of the electrolyte solution is conducive to reducing liquid-phase ohmic impedance of the battery and alleviating concentration polarization to some extent.

The invention discloses a copper alloy material with ultrahigh strength and high conductivity and a preparation method thereof. The copper alloy material comprises, by mass, 5%-13% of Ni, 6%-14% of Sn, 40%-70% of Sn (Ni + Sn), 0.01%-0.5% of M and the balance Cu, and M is selected from at least one of In, Al, Cr, V, Mn and Fe. The preparation process comprises the following steps: carrying out multi-stage homogenization treatment on a cast ingot of a columnar crystal structure containing the components, carrying out cyclic'processing-current treatment 'on the homogenized cast ingot to obtain an ultra-fine crystal structure, and then carrying out processing-aging treatment to obtain the ultra-fine crystal structure. The copper alloy material provided by the invention not only has ultrahigh hardness and tensile strength, but also has good conductivity.

The invention aims to disclose a preparation process of a high-wettability aluminum alloy and a high-strength and high-conductivity copper-aluminum composite material, and relates to the technical field of metal composite materials, and the high-wettability aluminum alloy and high-strength and high-conductivity copper-aluminum composite material comprises the following components in percentage by weight: 1.2%-2.1% of Si, 0.5%-1.0% of Fe, 0.03%-0.1% of Cu, 0.05%-0.07% of Mn, 0.05%-0.08% of Mg, 0.05%-0.1% of Zn, 0.05%-0.1% of Zr, 0.02%-0.05% of Ti, 20 ppm to 50 ppm of rare earth, and the balance of aluminum and inevitable impurities. Comprising the following steps that high-wettability aluminum alloy is cast and rolled into a semi-liquid alloy aluminum strip, and the thickness of the semi-liquid alloy aluminum strip ranges from 5 mm to 7 mm; casting and rolling to form a semi-solid copper strip, wherein the thickness of the semi-solid copper strip is 0.8-2mm; and the semi-liquid alloy aluminum strip and the semi-solid copper strip are cast-rolled and compounded into a composite metal strip of 6.0 mm-8. 5mm. The high-wettability aluminum alloy has the beneficial effects that the high-wettability aluminum alloy contains Si, Fe, Cu, Zr, Ti and rare earth, and has the characteristics of high strength, high hardness, high wettability and easiness in rolling; the semi-liquid aluminum alloy strip and the high-strength and high-conductivity semi-solid copper strip are continuously cast and rolled, and the formed composite metal strip has the characteristics of high peel strength, difficulty in layering and high conductivity.

The invention belongs to the field of catalyst preparation, and provides a preparation method for rapidly synthesizing a self-supporting high-entropy alloy difunctional electrocatalyst through Joule heat. The prepared FeCuRu-coated Ni1Co1-TPA is benefited from rich active sites, and the high conductivity of effective electron transfer and transmission is achieved. The catalyst shows excellent HER and OER catalytic performance under an alkaline condition, and the current density of 500mA cm <-2 > can be realized by only needing overpotentials of 120mV and 350mV, which is superior to those of a standard noble metal catalyst Pt / C and RuO2. In addition, when the composite material is used as a bifunctional electrocatalyst for electrolyzing water, the composite material shows excellent catalytic activity for electrolyzing water. The method has important significance for realizing the social renewable development target and developing clean and sustainable energy resources to replace fossil fuel.

The invention discloses a preparation method of a rapidly-formed Janus structure stretchable electrode, an electrode material system is a material system composed of thermoplastic polyurethane (TPU), liquid metal particles and N, N-dimethylformamide (DMF), and electrode forming comprises two self-assembly processes. In the first self-assembly process, the liquid metal particles rapidly settle to form a Janus structure under the action of gravity; and a second self-assembly process: quickly dissolving DMF in water under the action of phase separation, and quickly separating out TPU to form a porous structure. The whole electrode forming process is about 15 seconds, which is the fastest stretchable electrode film forming process so far. The electrode has high conductivity, high stretchability and insensitivity to tensile strain, the electrode can spontaneously form a Janus structure with one conductive side and the other insulated side so as to achieve a self-protection structure for the whole electrode, and the electrode is expected to be applied to the flexible electronic fields of electronic skin, human body information detection, stretchable electronic devices and the like.

The invention discloses a high-conductivity palladium alloy for a chip test probe and a preparation method of the high-conductivity palladium alloy, and the palladium alloy comprises the following components in percentage by mass: 50-58% of Pd, 35-40% of Cu, 5-10% of Ag, 0.05-1.0% of Cr and 0.1-1.5% of auxiliary elements, the auxiliary element is selected from at least one of Al, Zn, In and Si; the resistivity of the palladium alloy is 8.0 mu omega.cm or below, the Vickers hardness is 450 HV or above, the 90-degree bending frequency is 8 or above, the tensile strength is 1500 MPa or above, and the ductility is 6% or above, the palladium alloy is subjected to pre-smelting and secondary smelting, and at least part of Cu and at least part of Cr in raw materials are mixed and pre-smelted to obtain a copper-chromium intermediate alloy; and the copper-chromium intermediate alloy and the remaining raw materials are mixed and then subjected to secondary smelting. The palladium alloy can meet the urgent requirements of probes in various forms on low resistance, high plasticity and toughness, fatigue resistance, mechanical strength and the like at the same time.

The invention relates to a method for preparing a pyrochlore oxyfluoride solid electrolyte by a one-step solid phase method, which comprises the following steps: uniformly mixing lithium carbonate (Li2CO3), lanthanum oxide (La2O3), niobium pentoxide (Nb2O5) and lithium fluoride (LiF), and carrying out high-temperature one-time sintering under protective gas to synthesize a Li2-xLa (1 + x) / 3Nb2O6F (LLNOF solid electrolyte material. The synthesis route is optimized, a single fluorine source is used, and the types of raw materials are reduced; according to the method, secondary sintering is not needed, the pure-phase electrolyte powder can be obtained by adopting one-step sintering synthesis, the steps are simple, the efficiency is high, the cost is reduced, and the resource consumption is reduced. According to the obtained LLNOF electrolyte material powder, the synthesis temperature ranges from 900 DEG C to 1100 DEG C, heating to 1100 DEG C or above is not needed, the requirement for heating equipment is low, large-scale mass production can be conducted, the sample yield is large, and energy consumption is low. Required synthesis equipment is simple and easy to obtain, and the ionic conductivity is good. The lithium ion conductor with high conductivity and stability in air is synthesized through a one-step method.

Provided are: a multilayer carbon nanotube assembly having high conductivity; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.　Provided are: a multilayer carbon nanotube assembly including a multilayer carbon nanotube that has a median diameter of 80 nm or more in a volume-based particle size distribution obtained by a centrifugal sedimentation method when measured as an aqueous dispersion liquid at a concentration of 0.004% by mass, and has a rate of change in transmittance measured by a centrifugal sedimentation method of 0.3% or less per hour when measured as an aqueous dispersion liquid at a concentration of 0.2% by mass; a multilayer carbon nanotube dispersion liquid; a conductive material; an electrode; a secondary battery; a planar assembly; a filter; an electromagnetic wave shield; and a pellicle for extreme ultraviolet rays.

The invention provides a carbon nanotube / polyvinyl alcohol hydrogel and a preparation method and application thereof, and belongs to the technical field of composite materials and flexible electron cross materials. Cellulose nanofibers and multi-walled carbon nanotubes are dispersed in deionized water to obtain dispersion liquid; uniformly mixing a polyvinyl alcohol solution and the dispersion liquid to obtain a mixed solution; carrying out oriented freezing forming on the mixed solution, and then freeze-drying the mixed solution to obtain an aerogel sample; performing hot pressing on the aerogel sample to obtain a thin film material; and swelling and balancing the film material in deionized water to obtain the carbon nanotube / polyvinyl alcohol hydrogel. According to the invention, collaborative optimization of conductive network continuity, interface bonding strength and energy dissipation capability is realized, so that high conductivity, high stress and obdurability are considered, and the material is endowed with multi-dimensional strain sensing capability and signal stability; and a new idea is provided for realizing effective balance between high conductivity and excellent mechanical properties of the hydrogel material.

The invention relates to the technical field of solid electrolyte, in particular to normal-temperature surface modified flexible oxide solid electrolyte and a preparation method and application thereof. The normal-temperature surface-modified flexible oxide solid electrolyte is prepared from the following raw materials: a monomer, polyethylene oxide, a solvent, an initiator, a modified oxide ceramic electrolyte and electrolyte salt, wherein the mass of the monomer is 1-10% of the total mass of the components; the molar ratio of the initiator to the monomer is 0.01%-0.1%; the molar ratio of the electrolyte salt to the monomer is 1: (6-12); the mass ratio of the electrolyte salt to the modified oxide ceramic electrolyte is 1: (2.5-5). The flexible oxide solid electrolyte has high conductivity, wide temperature tolerance range and high structural stability, and when the flexible oxide solid electrolyte is applied to an all-solid-state lithium metal battery, the ionic conductivity, safety and cycle performance of the battery are improved.

The invention discloses a high-entropy NASICON type solid electrolyte and a preparation method thereof. According to the electrolyte, on the basis of Na3Zr2Si2PO12, five or more metal elements # imgabs0 # and # imgabs1 # with different valence states and different functions are doped at Zr sites through a solid-phase sintering method to obtain high-entropy # imgabs2 #, and the high-entropy # imgabs2 # can be further subjected to ion exchange to obtain # imgabs3 #; the regulation and control on the carrier (A = Na / Li) concentration, A-O bond energy and A + migration energy barriers can be realized while the lattice freedom degree of the electrolyte is improved, so that higher room-temperature conductivity is obtained while the electrochemical stability of the electrolyte is ensured.

The invention provides a quick-charge and quick-discharge type lithium battery and a preparation method thereof, and belongs to the technical field of lithium battery preparation. The preparation process comprises the following steps: preparing a fluorinated carbon nanotube based on biomass carbon; preparing a positive electrode plate; preparing the dendritic mesoporous silicon dioxide nano particles; preparing a cerium oxide-loaded two-dimensional hierarchical porous composite material; preparing a negative electrode plate; and assembling the lithium battery. According to the preparation method, the eutectic and the carbon fluoride nanotubes are added in the preparation of the positive electrode plate, and the cerium oxide-loaded two-dimensional hierarchical porous composite material and the carbon fluoride nanotubes are added in the preparation of the negative electrode plate, so that the prepared positive electrode plate and the prepared negative electrode plate have relatively high conductivity; and moreover, the ion transmission efficiency is improved, the rapid ion transmission is beneficial to reducing the polarization phenomenon of the battery, improving the charging and discharging rate and the power performance of the battery, enhancing the structural stability of the electrode, improving the performance and the safety of the battery, and being more beneficial to rapid charging and rapid discharging.

The invention discloses a magnetic visible light photocatalyst ZnFe2O4 / MXene as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. According to the specific technical scheme, the preparation method comprises the following steps: fully dissolving a zinc source and an iron source in a solvent under the ultrasonic action, adding a morphology regulator, and preparing magnetic ZnFe2O4 through a hydrothermal method; then a two-dimensional material MXene with high conductivity is introduced to promote separation and migration of ZnFe2O4 photo-induced electrons and holes and inhibit compounding of the ZnFe2O4 photo-induced electrons and holes, so that the photocatalytic efficiency is improved, and the magnetic visible light photocatalyst ZnFe2O4 / MXene is prepared. The prepared photocatalyst is easy to recover, has the advantage of rapidly degrading organic pollutants, and has a good application prospect in the aspect of treatment of organic wastewater such as dyeing wastewater and medical wastewater.

To provide a multilayer carbon nanotube assembly having high conductivity and excellent dispersibility to a dispersant, a multilayer carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic wave-shielding and a pellicle for extreme-ultraviolet light.SOLUTION: A multilayer carbon nanotube assembly includes a multilayer carbon nanotube with a maximum length of 1000 to 30000 μm and an Fe atom, in which a content ratio of the Fe atom to a total mass of the assembly is 0.5 mass% or more and less than 10 mass%. There are also provided a multilayer carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic wave-shielding and a pellicle for extreme-ultraviolet light.SELECTED DRAWING: None

The application relates to the technical field of material preparation, and discloses multi-element carbon-coated lithium manganate, a preparation method thereof and a secondary battery. The multi-element carbon-coated lithium manganate comprises a lithium manganate core and a carbon nanotube layer and a hard carbon layer which are sequentially coated on the lithium manganate core. The chemical formula of the lithium manganate core is LiAl a X b Mn 2‑a‑b O4, wherein 0.01<=a<=0.10, 0.01<=b<=0.05, and X comprises at least one of Co, Cr, Ti, V and B. The preparation method of the multi-element carbon-coated lithium manganate comprises the following steps: (I) preparing doped lithium manganate, (II) preparing carbon nanotubes and (III) multi-element carbon coating. The multi-element carbon-coated lithium manganate has high conductivity, rate performance, cycle performance and safety performance, and can be used as an alternative positive electrode material with high cycle and excellent fast-charging performance.

The invention provides an alkaline ion battery negative electrode material as well as a preparation method and application thereof, and particularly relates to an MXene / MoS2 / TiO2 composite material which is prepared by the following steps: etching an MAX phase by using mixed acid containing HF to obtain MXene; performing freeze drying to obtain powder containing MXene, a Mo source and an S source; and calcining to obtain the composite material. According to the negative electrode material disclosed by the invention, MoS2 is supported by utilizing high conductivity of MXene and structural collapse of the MoS2 is relieved, and TiO2 enhances cycle stability, is designed for a negative electrode of an alkaline ion battery and shows good cycle performance. MXene is obtained by etching an MAX phase with mixed acid, the composite material is prepared by combining freeze drying and calcination, NH prevents MXene from stacking and expands interlayer spacing, MoS2 is formed after calcination, and a small amount of TiO2 is generated in situ. And the single-layer MXene is used as a binder to replace a traditional material, so that the electrochemical performance of the composite electrode is improved.

The invention belongs to the technical field of halide solid-state electrolyte, and relates to a high-conductivity and high-lithium-stability modified halide solid-state electrolyte material constructed by solid source plasma, and a preparation method and application of the high-conductivity and high-lithium-stability modified halide solid-state electrolyte material. According to the preparation method, a halide solid electrolyte is taken as a matrix, halogenated ammonium salt is taken as a solid source, and the halide solid electrolyte is subjected to synergistic doping modification of elements such as nitrogen, fluorine / chlorine / bromine and the like by utilizing a plasma technology, so that the modified halide solid electrolyte material is obtained. The modified halide solid electrolyte material shows excellent conductivity and lithium-lithium symmetrical battery performance, and has a wide market application prospect. Meanwhile, the preparation method provided by the invention is simple, rapid, efficient and convenient, is easy to control, and contributes to promoting the development and application of the high-performance halide solid electrolyte material.

The invention belongs to the field of conductive films, and discloses a preparation method of a conductive film based on PEDOT: PSS and silver nanowires, and the preparation method specifically comprises the following steps: after carrying out surface hydroxylation treatment on the silver nanowires AgNWs, under the action of a silane coupling agent 3-(trimethoxymethylsilyl) propyl methacrylate TMSPMA, mixing the silver nanowires AgNWs with PEDOT: PSS to prepare a PEDOT: PSS / AgNWs base solution; the preparation method comprises the following steps: adjusting the pH value of a base solution to be nearly neutral through sodium citrate, then mixing the base solution with a PEA emulsion, carrying out spin coating to form a film, and finally, carrying out ultrafast laser treatment to improve the conductivity so as to obtain the conductive film based on PEDOT: PSS and silver nanowires. The conductive film provided by the invention has high conductivity (gt; 1200 S / cm), good stability and excellent mechanical properties, and is suitable for a flexible electronic device and stable work in a certain humidity environment.

The invention provides a vapor deposition silicon-carbon composite material for in-situ growth of interconnected carbon nanotubes and a preparation method of the vapor deposition silicon-carbon composite material, and belongs to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: firstly, complexing and neutralizing a metal salt catalyst solution, then blending the metal salt catalyst solution with a vapor deposition silicon-carbon material, placing a catalyst on the surface and inside the silicon-carbon material, and growing carbon nanotubes in situ under proper conditions to obtain the vapor deposition silicon-carbon composite negative electrode material interconnected with the in-situ grown carbon nanotubes. The prepared vapor deposition silicon-carbon negative electrode material of the in-situ growth interconnection carbon nano tube has the advantages of high conductivity, good mechanical property, high initial coulombic efficiency, long cycle life and the like, the preparation process route is clear, industrial production is easy, and the vapor deposition silicon-carbon negative electrode material has important significance and value for developing a novel negative electrode material of a high-performance lithium ion battery.

The invention relates to a non-equimolar-ratio high-entropy thermoelectric ceramic and a preparation method thereof. The chemical formula of the non-equimolar-ratio high-entropy thermoelectric ceramic is (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 (x = 0.1-0.4). Through presintering, spark plasma sintering and reduction annealing processes, a single-phase perovskite structure composed of phases of the A-site high-entropy perovskite thermoelectric ceramic is obtained, equiaxed crystal grains are arranged in the ceramic, and the morphology of the equiaxed crystal grains is matched with that of cubic perovskite structure crystal grains. Elements Ca, Sr, Ba, La, Ti and O in the ceramic are uniformly distributed in the ceramic, and no agglomeration phenomenon exists. The A-bit non-equimolar-ratio high-entropy perovskite thermoelectric ceramic (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 obtained by the invention has low thermal conductivity, high conductivity and Seebeck coefficient, further shows a high thermoelectric ZT figure of merit, is simple to operate and short in time period, and provides an effective path for preparing high-temperature thermoelectric materials.

The present invention provides an electrically-conductive composite water-based binder as well as a preparation method therefor and the use thereof. The electrically-conductive composite water-based binder comprises in parts by weight: 90-100 parts of a polyacrylic acid or polyacrylate water-based binder and 0.1-10 parts of an electrically-conductive filler. By means of introducing the electrically-conductive filler into the binder, the electrically-conductive composite water-based binder for lithium ion batteries which has flexibility, low swelling, good binding force and high conductivity is prepared, so that the binder plays a better role in lithium ion batteries.

The invention provides a lithium metal composite negative electrode, a preparation method thereof and a solid-state battery. The lithium metal composite negative electrode is of a three-layer structure and sequentially comprises a current collector, an active substance layer and a graphene space layer, the active substance layer is a lithium metal and / or lithium alloy layer, and the graphene space layer comprises three-dimensional graphene, lithium salt, a binder and a hydrophilic additive. In the space layer, the three-dimensional graphene is a novel carbon nanomaterial, the excellent characteristics of super-large specific surface area and super-high conductivity of the graphene are maintained, the pi-pi acting force between graphene sheet layers is overcome, the stability of a macrostructure is maintained, and the three-dimensional graphene serves as a space layer material to effectively store lithium ions and regulate and control lithium ion deposition; and the cycle and rate performance of the solid-state battery is improved.