113results about How to "Good ion transmission ability" patented technology

The invention discloses a surface modified porous carbon structural carbon fiber/sulfur composite cathode material and a preparation method thereof. The composite cathode material is formed by compounding surface modified porous carbon structural carbon fiber and elemental sulfur. The preparation method comprises the steps: firstly, preparing an organic metal frame coated carbon fiber composite by using a solvothermal method; carbonizing the composite at high temperature; and then, compounding the composite with sulfur to obtain the surface modified porous carbon structural carbon fiber/sulfur composite cathode material. The preparation method is simple; the adopted raw materials are low in cost; the prepared composite cathode material has high specific capacity and high utilization ratio of active sulfur; the cycle performance of a lithium sulfur battery is greatly improved.

The invention relates to the field of lithium ion battery materials, and in particular relates to an adhesive and a lithium ion battery with the same. The adhesive is a polymer containing structure units shown as the formulas I, II, III and IV, and the number-average molecular mass of the adhesive is 0.5 million to 1.2 million. The invention also relates to the lithium ion battery, comprising a positive electrode piece, a negative electrode piece, a separator and electrolyte, wherein the positive electrode piece comprises the adhesive. With the adhesive, the flexibility of the positive electrode piece can be improved greatly, so that the problems of processing, battery performance and the like, caused by crisp electrode pieces, can be avoided, the compaction density can be enhanced, and the energy density of the battery can be further improved.

The invention discloses a preparation method of a flexible anode of a lithium-selenium battery. The flexible anode is compounded of a carbon fiber film and elemental selenium, wherein the carbon fiber film is self-supported and modified with nitrogen-containing porous carbon on the surface. The preparation method concretely comprises the steps of in situ forming a metal-organic framework ZIF-8 on a freeze-dried bacterial cellulose membrane, carrying out high temperature carbonization, and enabling the product to be compounded with a selenium-containing organic solvent. The flexible anode of the lithium-selenium battery, obtained by the method, has the advantages of good selenium fixing effect, high selenium content, high mechanical strength, etc. Furthermore, the preparation method is simple and does not need a complicated coating technology; the prepared flexible anode of the lithium-selenium battery is free of a bonding agent, a conductive agent and a current collector, is applied to the lithium-selenium battery and has excellent electrochemical performance.

The invention relates to a sulfur-doped molybdenum selenide negative composite material for a sodium-ion battery and a preparation method of the sulfur-doped molybdenum selenide negative composite material, and belongs to the technical field of sodium-ion batteries. The sulfur-doped molybdenum selenide negative composite material comprises sulfur-doped molybdenum selenide and a carbon nanotube, wherein the sulfur-doped molybdenum selenide is evenly deposited for growth on the surface of the carbon nanotube to form a three-dimensional conductive network. According to the preparation method, a molybdenum oxide evenly grows on the surface of the carbon nanotube through a hydrothermal synthesis method; with the molybdenum oxide/carbon nanotube composite material as a molybdenum source and a carbon source, the molybdenum oxide/carbon nanotube composite material is evenly dispersed into an alcoholic solution; a reducing agent, a selenium source and a sulfur source are added; the alcoholic solution is cooled and dried to a room temperature after hydrothermal reaction; and then the sulfur-doped molybdenum selenide negative composite material is obtained through high-temperature calcination treatment. The preparation method is simple, reliable, good in process repeatability, high in operability, low in cost and applicable to industrial production. The composite material shows high specific capacity and long cycling stability when applied to the sodium-ion battery.

The invention provides a preparation method of a two-dimensional/one-dimensional heterogeneous nanochannel film. The method is characterized by comprising the following steps that step 1, graphene oxide is dissolved in an aqueous piperazine solution, and ultrasonic treatment is performed at the room temperature to obtain a uniformly dispersed first solution; step 2, the first solution is added dropwise to the upper layer of a porous aluminum oxide film, and after the solvent is evaporated at the room temperature, a first composite film with a graphene oxide film layer and a porous aluminum oxide film layer is obtained; step 3, a benzenetricarbonyl trichloride solution is added dropwise to the upper surface of the graphene oxide film layer of the first composite film, and drying is carriedout to obtain the two-dimensional/one-dimensional heterogeneous nanochannel film. The invention provides the two-dimensional/one-dimensional heterogeneous nanochannel film prepared by using the methodand application of the two-dimensional/one-dimensional heterogeneous nanochannel film in salt difference energy conversion.

The utility model relates to a polymer electrolyte film for a micro cross-linking gel state lithium-ion battery and a preparation method, which is used for making the battery. The utility model discloses the poly-acrylonitrile-methyl methacrylate with the cross-linking degree of 0.1 to 0.4 % is obtained after suspension polymerization with the monomer component mass ratio of a methyl methacrylate and an acrylonitrile of 1:9 to 4:6, then the poly-acrylonitrile-methyl methacrylate is dissolved by a polar organic solvent and coated on a formed die, finally the micro cross-linking degree polymer electrolyte film is obtained when the film is removed from the formed die, the thickness of the film is 20 to 50um, the tensile strength is 7 to 22Mpa, and the average hole diameter is 0.1to 3um. The utility model has advantages of good conductivity, good absorbing capability, good heat stability, good electrochemical stability and good mechanical property under the ambient temperature, and simple manufacturing operation, high transforming rate of polymer, economy and environmental friendliness.

The invention discloses a polymer isolating membrane, comprising: (a) a porous substrate and (b) a polymer coating arranged on the porous substrate; wherein the polymer in the polymer coating contains mixture of monomer methyl methacrylate, monomer vinyl acetate and low polymer polyethylene glycol diacrylate, or mixture of monomer methyl methacrylate, monomer vinyl acetate and low polymer polyethyleneglycol dimethacrylate or mixture of the two mixtures. The polymer isolating membrane of the invention has desired lithium interface stability, tensile strength and ionic conductivity, the ionic conductivity of gel polymer electrolyte obtained by virtue of the polymer isolating membrane of the invention can reach 3.02x10-3S/cm at room temperature, tensile strength is more than 15MPa, and lithium interface resistance is small and interface stability is good. Besides, the invention also discloses a lithium ion battery applying the polymer isolating membrane of the invention.

The invention discloses a preparation method for a graphene nanobelt-lithium iron phosphate composite material, and belongs to the technical field of a lithium ion battery. A carbon nanotube is subjected to chemical cutting and ultrasonic peeling to prepare a graphene nanobelt; then commercial lithium iron phosphate is endowed with positive static charges through a surfactant; and next, the prepared graphene nanobelt and the lithium iron phosphate are ultrasonically-mixed and dried to prepare the graphene nanobelt-lithium iron phosphate composite material product. The preparation method has the characteristics of simple process, convenient operation, capability of promoting large-scale production, convenience in popularization and application, low energy consumption, low production cost, high production safety and the like; the product prepared by the preparation method has the characteristics of excellent conductivity, high ionic transport property, long cycle life, high rate charge-discharge performance and the like; the preparation method can be widely applied to the preparation of the graphene nanobelt-lithium iron phosphate composite material; and the product prepared by the preparation method can be widely used as a positive electrode material to be applied to the lithium ion battery which has high requirement on cycle performance and rate capability.

The invention relates to an anthraquinone molecule-cografted carbon/conductive polymer composite material and a preparation method thereof. The method comprises the steps of adding graphene oxide and an epoxidized carbon nanotube to an amino-anthraquinone ethanol solution and carrying out heating reflux to prepare anthraquinone molecule-cografted carbon; and adding a conductive polymer monomer, a dopant and an oxidant to an anthraquinone molecule-cografted carbon dispersion liquid, reacting at 0-30 DEG C under a stirring condition for 12-24 hours and then obtaining the anthraquinone molecule-cografted carbon/conductive polymer composite material. Amino-anthraquinone molecules are cografted with the graphene oxide and the carbon nanotube as an electroactive medium, so that the dispersity of the graphene in the composite material is improved and a potential window is expanded; a composite grafting structure of a two-dimensional graphene sheet and a one-dimensional carbon nanotube is compounded with a conductive polymer to obtain the composite material with a three-dimensional network structure; and the anthraquinone molecule-cografted carbon/conductive polymer composite material has relatively high energy density and cycle stability as a super capacitor electrode material.

The invention provides an ultrahigh specific surface area mesoporous carbon nanosphere as well as a preparation method and application thereof, wherein the ultrahigh specific surface area mesoporous carbon nanosphere is prepared by carbonizing aniline, pyrrole and a block copolymer at high temperature by a mesoporous carbon nanosphere precursor through a copolymerization-induction self-assembly method and is of a mesoporous/microporous shell layer structure with the diameter being 200-800nm, the size of mesopores being 6-20nm, the specific surface area being 372-2520m<2>/g and the total pore volume being 0.24-1.43cm<3>/g. The ultrahigh specific surface area mesoporous carbon nanosphere integrates the unique advantages of a porous carbon material and a mesoporous material, is larger in specific surface area and pore volume, good in conductivity and ion transmission performance and has wide application prospect in various fields of energy, catalysis, adsorption, biomedicines and the like due to a proper quantity of nitrogen doping and modifiability of a skeleton wall.

The invention discloses a modified high-voltage positive electrode material as well as a preparation method and application thereof. The modified high-voltage positive electrode material comprises a high-voltage positive electrode material core and a conductive polymer shell layer coating the surface of the high-voltage positive electrode material core, the preparation method comprises the following steps: carrying out in-situ reaction by adopting a high-voltage positive electrode material, a conductive polymer monomer, a catalyst and an initiator or carrying out direct coating by adopting thehigh-voltage positive electrode material, a conductive polymer and a coupling agent. The modified high-voltage positive electrode material can gradually react with an electrolyte in a battery througha controllable electrochemical activation process to form a new surface compact coating layer, the surface impedance of the battery can be effectively reduced, the ion transmission performance is improved, the rate capability of the material is improved, and the preparation method is simple to operate, high in controllability, non-toxic, harmless, few in by-product and suitable for industrial production.

The invention relates to a preparation method for a self-supporting porous electrode, and the self-supporting porous electrode. The preparation method comprises the following steps: mixing organic polymer resin, a conductive agent and a carbon-sulfur compound in an organic solvent, scraping the obtained mixture onto a notched substrate, preparing an electrode blank by using an immersion phase inversion method, separating the electrode blank from the substrate, and subjecting the electrode blank to washing and freeze drying so as to prepare the self-supporting porous electrode. The flexible porous electrode is simple and environment-friendly to prepare, controllable in thickness, adjustable in pore size and porosity, wide in application scope, and capable of maximally reducing material waste in shearing and flaking and breaking requirements of traditional flexible self-supporting electrodes on material dimensions (i.e., 1D and 2D).

The invention discloses a graphitizing carbon material with a three-dimensional micro-nano composite structure, and a preparation method and application thereof, and belongs to the technical field ofenergy source materials. The preparation method comprises the following steps of firstly, mixing indium salt, BTC (trimesic acid) and a solvent at room temperature, stirring and/or treating by ultrasonic waves until the solid is dissolved; then, treating by a hydrothermal method, so as to obtain a precursor; further carbonizing, pickling, and the like, so as to obtain the graphitizing carbon material of the three-dimensional micro-nano composite structure, wherein the porous graphitizing carbon material can be used as an active matter carrier and applied to a positive electrode of a lithium and sulfur battery. The prepared porous graphitizing carbon material with a spherical structure has the advantages that the porous graphitizing carbon material is a secondary micrometer-level carbon sphere formed by primary nanometer-level hollow particles; the carbon sphere has more internal cavities, large pore capacity, large specific surface area, good dispersivity and high stability; the conductivity is good. The lithium and sulfur battery using the porous graphitizing carbon material as the carrier for the active matter sulfur has higher energy density, good rate and cycle property.

The invention discloses a preparation method of a cigarette filter tip and graphene composite material. The preparation method comprises the following steps: soaking recycled cigarette filter tips into an oxidized graphene and ethyl alcohol dispersion liquid repeatedly, drying, and then carrying out carbonization to obtain the cigarette filter tip and graphene composite material. The invention also discloses application of the prepared material. Oxidized graphene is doped into the filter tips of waste cigarette ends by controlling the dispersion concentration of the oxidized graphene inside anethyl alcohol solution. After carbonization, the oxidized graphene is thermally reduced into graphene and is doped into the material, and the material contains trace elements such as nitrogen. The obtained composite material is porous, and has high specific surface area and excellent electrical conductivity and ion transmission property. Therefore, the composite material can serve as an electrodematerial of supercapacitors. The preparation method has the advantages of simple technology, low cost and high speed, the waste cigarette ends can be directly recycled, and the composite material hasgood environmental benefits and economic benefits.

The invention provides a gel electrolyte, a preparation method and application thereof. According to the gel electrolyteprovided by the invention, the gel electrolyte is obtained by gelling by polymerizing a composition comprising boric acid or a derivative thereof, a polymer monomer, a polymerization initiator, an organic solvent, and an electrolyte salt. The invention also relates to a preparation method of the gel electrolyte, a battery or a capacitor comprising the gel electrolyte and a preparation method of the battery.

Provided are a negative electrode material, a method for preparing the same, a negative electrode tab, an electrochemical device, and an electronic device, the negative electrode material comprising: a core comprising: a porous carbon material; the silicon-containing compound Si-M-C is loaded in pores of the porous carbon material, and M is one or more of B, N, O and Al; and a conductive carbon layer on a surface of the core.

The invention provides an ion transmission system and method, the ion transmission system comprises a power supply and a vacuum supply device, and the vacuum supply device comprises a first vacuum cavity and a sucking pump; the ion transmission system further comprises a first transmission device arranged in the first vacuum cavity, the first transmission device comprises multiple sets of electrodes, each set of electrodes comprises multiple electrodes in axial symmetry, the multiple electrodes define a circular area, the diameter of the circular area defined by the multiple sets of electrodes is gradually decreased in the arrangement direction of the multiple sets of electrodes, and the diameter of the circular area is larger than that of the multiple sets of electrodes. The electrodes in each group of electrodes are sequentially arranged along the axial direction; and the power supply is used for applying voltage to the plurality of electrodes in each group of electrodes, so that ions advance in an area enclosed by each group of electrodes in an accelerated and focused manner. The method has the advantages that the ion focusing effect is good, and electric field deviation caused by machining and assembling errors is eliminated.

The invention provides a binder and a rechargeable battery containing the same, and relates to the field of batteries. The binder contains polymers of structural units shown as a formula I, a formulaII, a formula III and a formula IV; and the problem that in the prior art, when PVDF or modified PVDF is adopted as the binder, a pole piece is prone to breakage or active substances fall off can be solved through the binder, the purpose of improving the flexibility of the binder and the binding performance is achieved, and therefore, the cycling stability of the battery is improved.

The invention discloses a carbon-coated NiTiO3/CNT negative electrode material. Carbon-coated nickel titanate nano-particles grow on the surface of a carbon nano tube in situ. The invention further discloses a preparation method of the carbon-coated NiTiO3/CNT negative electrode material. The preparation method includes the steps of dissolving and/or dispersing the carbon nano tube, a titanium source, a nickel and an organic carbon source in a solvent, mixing with stirring to obtain a mixed solution; subjecting the mixed solution to hydrothermal reaction, solid-liquid separation and washing to obtain a coated precursor; subjecting the coated precursor to thermal treatment to obtain the carbon-coated NiTiO3/CNT negative electrode material. The invention further discloses application of the carbon-coated NiTiO3/CNT negative electrode material in a sodium-ion battery. The carbon-coated NiTiO3/CNT negative electrode material is excellent in electrical properties, simple in preparation process, low in cost and wide in industrial application prospect.

The invention provides a hydroelectric fabric and a preparation method and application thereof, and belongs to the technical field of intelligent materials. The hydroelectric fabric takes fiber yarns as warp yarns and takes fiber yarns and metal wires as weft yarns, and the hydroelectric fabric is obtained by weaving the warp yarns and the weft yarns. The fiber yarns and the metal wires are woven to obtain the hydroelectric fabric, rich polar groups (hydroxyl groups) are distributed on macromolecular chains of the fiber yarns, the hydroelectric fabric has a good air moisture absorption effect and excellent ion transmission capacity, hydroelectricity is achieved by combining and utilizing the metal wires, the hydroelectric fabric is used for moisture power generation, and the hydroelectric fabric has excellent market prospects. The hydroelectric fabric can effectively utilize water vapor or sweat released by a human body, is clean, environment-friendly and convenient, can provide important power supply for intelligent clothes, and can provide important thinking reference for designing and developing novel flexible materials.

The invention belongs to the field of energy storage studying, and particularly relates to a lithium titanate cathode material which comprises a core structure and a shell structure. Thickness of the shell structure is h1 which is less than or equal to 5um, the shell structure is of a porous structure, pores are of micro-nano size and are uniformly distributed in the shell structure, and porosity is 1-20%. In other words, the shell structure is thick enough, so that stability of the shell structure is maintained, and effective effect on isolating the core shell from an electrolyte is realized. The porous structure enables the lithium titanate cathode material to have excellent ion transmission performance, so that the lithium titanate cathode material has excellent electrochemical performance.