40results about How to "Improve ion conduction" patented technology

An alkali fuel cell comprises a solid stack consisting of a first electrode, a solid membrane conducting hydroxide ions and a second electrode, each electrode comprising an active layer that is in contact with the solid membrane. The material forming the active layer of each electrode comprises at least a catalytic element, an electronic conductive element and an element conducting hydroxide ions. The element conducting hydroxide ions is a polymer having vinylaromatic units comprising a quaternary ammonium function and a hydroxide ion OH⁻ is associated with each quaternary ammonium function. One such alkali fuel cell is unaffected by carbonation and maintains good electrochemical performances.

The invention relates to a lithium ion battery and a fabrication method thereof, in particular to an all-solid-state lithium ion battery and a fabrication method thereof. The all-solid-state lithium ion battery comprises a positive current collector, a positive active material layer, a negative current collector, a negative active material layer and a solid electrolyte, wherein the positive active material layer is fabricated on the positive current collector by a powder method, and the negative active material layer is fabricated on the negative current collector by a thin film method. By the fabrication method, the all-solid-state lithium ion battery which has excellent integral performance, is low in production cost and is suitable for large-scale industrial production can be obtained.

The invention belongs to the field of polymer anion exchange membranes and preparation thereof, and particularly relates to polyarylethersulfone containing multiple flexible side chain quaternary ammonium salt structures, and a preparation method thereof. The preparation method comprises the following steps: firstly, performing bromination and Suzuki coupling on 4,4'-difluorodiphenyl sulfone to prepare an active difluorosulfone monomer containing an octamethoxy structure; then, performing copolycondensation on the monomer, 4,4'-difluorodiphenyl sulfone and biphenol to prepare polyarylether sulfone containing a polymethoxy structure, further utilizing a demethylation reaction to convert the prepared polyether sulphone containing the polymethoxy structure into a polymer containing a hydroxylstructure, and finally utilizing a Williamson reaction to react the polymer containing the hydroxyl structure with (5-bromopentyl)trimethylammonium bromide to obtain the polyethersulfone containing multiple flexible side chain quaternary ammonium salt structures. The polyarylethersulfone has excellent film-forming property, and the prepared polymer film has high alkali-resistant stability, ionicconductivity and dimensional stability, and has important potential application value in application of alkaline fuel cells.

The invention provides a method for preparing carbon quantum dot modified lithium-sulfur battery positive electrode materials, and belongs to the field of preparation of lithium-sulfur battery positive electrode materials. The method has the advantages that carbon quantum dots with functionalized polyethyleneimine surfaces are used for preparing lithium-sulfur battery positive electrodes, shuttling effects in battery charge and discharge procedures can be inhibited under polysulfide adsorption effects of polyethyleneimine, and accordingly the long cycle performance of lithium-sulfur batteriescan be guaranteed; the method for preparing the carbon quantum dot modified lithium-sulfur battery positive electrode materials includes simple and convenient processes, the capacity, the rates and the cycle performance of the lithium-sulfur batteries under working conditions of high load and high current density can be obviously improved, and accordingly the method has a potential application value in the field of lithium-sulfur batteries.

The invention discloses a silicon or silicon oxide@titanium oxide core-shell structure composite material, and belongs to the technical field of lithium ion battery negative electrode materials. The composite material is a core-shell double-layer structure, the inner layer contains silicon or silicon oxide(SiOx), and the outer layer contains titanium oxide and densely and evenly wraps the inner layer. The invention also discloses a preparation method of the composite material. The preparation method includes the following steps of: adding powder containing silicon or silicon oxide and a surfactant into a reactor, mixing with a dispersion solution, adding a precursor solution into the mixture, heating to a coating reaction temperature for coating reaction, and obtaining an intermediate product; and roasting the intermediate product under the protection of an inert atmosphere to obtain the composite material. The composite material has the characteristics of easy dispersibility, high Sicontent, significantly-improved conductivity, high specific capacity and good cycle stability. The preparation method is simple in process, has no pollution, is low in cost and short in procedure, andis easy to realize batch production.

The invention discloses a ternary positive electrode material@titanium nitride core-shell-structured composite material, belonging to the technical field of positive electrode materials of lithium ion batteries. The composite material is of a compact double-layer structure, wherein the inner layer is a nickel-cobalt-aluminum or nickel-cobalt-aluminum ternary positive electrode material, and the outer layer is a high-crystallinity titanium oxide TiN; on the basis that the total weight of the composite material is 100%, the mass fraction of the inner layer is 30-95%, and the mass fraction of the outer layer is 5-70%; and the outer layer is TiN with high crystallinity, the crystallinity of the outer layer is not lower than 90%, and the purity of the outer layer is not lower than 99.5%. In addition, the invention also discloses a preparation method of the composite material. Compared with an original ternary positive electrode material which is not subjected to coating treatment, the composite material of the invention has the characteristics of remarkably improved conductivity, relatively high specific capacity, good cycling stability, improved rate capability and reduced internal resistance. The preparation method is simple in process, free of pollution, low in cost, short in flow and easy for industrial amplification.

The invention provides a lithium-sulfur battery positive copolymer sulfur material. The lithium-sulfur battery positive copolymer sulfur material is prepared through steps as follows, (1), sublimed sulfur powder and organic polymerization agent are collected to obtain uniform mixture through grinding, and the organic polymerization agent is nitrile organic substance; (2), the uniform mixture of the sublimed sulfur and the organic polymerization agent is sealed in a container under the high temperature condition and is insulated and stirred; and (3), the copolymerized sulfur obtained in the step (2) is pulverized to obtain positive electrode copolymerized sulfur particles. The invention further provides a lithium-sulfur battery made from the lithium-sulfur battery positive copolymer sulfurmaterial. The lithium-sulfur battery positive copolymer sulfur material is advantaged in that preparation requirements can be met through simple heating equipment, and the preparation process has characteristics of convenient operation and simple process. The preparation method is advantaged in that chemical bonding between the organic matter and the sulfur is produced through bond opening reaction of nitrile compounds'unique carbon-nitrogen triple bond and the 8-membered ring structure of the sublimated sulfur at the high temperature, and the polymeric sulfur copolymer can be formed.

The invention relates to the technical field of lithium ion batteries, in particular to an electrode and a preparation method thereof. The electrode comprises a current collector, a plurality of through hole layers and a plurality of active layers, the through hole layers and the active layers are arranged on the current collector, and the through hole layers are arranged between the current collector and the active layers or between any adjacent active layers. The electrode is composed of a plurality of active layers and through hole layers, each through hole layer is composed of a net structure of a high polymer, the high polymer is dissolved in electrolyte when the electrode is used, namely a pore structure with controllable pore size and distribution is formed, so that each active layer can be in contact with more electrolyte, and the problems that electrolyte infiltration of a thick electrode is difficult and ion transmission is slow are solved. Besides, the morphology of the through hole layer is controllable, compared with a traditional porous electrode, the tortuosity of pores is lower, ion conduction is faster, the ion conductivity of the pole piece is improved, and then the energy, the power density and the rate capability of a battery cell are guaranteed.

The present invention provides a pressure-sensitive adhesive composition which is excellent in removability, peel adhesive power temporal stability and staining properties; a pressure-sensitive adhesive layer produced with the same; and a pressure-sensitive adhesive sheet. The present invention also provides a pressure-sensitive adhesive composition which can prevent electrification of a non-antistatic protected adherend when peeled off using an ionic compound which is an antistatic agent, and is less likely to cause lifting and is also excellent in removability; a pressure-sensitive adhesive layer produced with the same; and a pressure-sensitive adhesive sheet.

The invention discloses a silicon nickel alloy-graphene electrode material and preparation method and application thereof. The electrode material is a silicon nickel alloy-graphene material, wherein graphene is in full contact with silicon nickel alloy, and silicon particle wraps an intermediate phase of the silicon nickel alloy. The preparation method comprises the steps of taking silicon powderand nickel powder as raw materials, and preparing silicon nickel alloy by a plasma discharging sintering (SPS) mode; and pulverizing the silicon nickel powder, performing ball-milling and combinationwith graphene powder to obtain the silicon nickel alloy-graphene electrode material. The invention also provides application of the silicon nickel alloy-graphene electrode material in preparation of alithium ion battery negative electrode. The silicon nickel alloy-graphene electrode material has the advantages of high reversible capacity, good cycle stability and the like, and mass production canbe achieved.

The invention discloses an electrolyte for a solid electrolyte-containing lithium secondary battery and application of the electrolyte. The electrolyte comprises a lithium salt and a non-aqueous organic solvent; the non-aqueous organic solvent is an ether compound and/or a non-ether organic matter with polarity smaller than that of diethyl ether; and the non-aqueous organic solvent does not dissolve a solid electrolyte and does not react with the solid electrolyte. The electrolyte provided by the invention can be used as an electrolyte of the lithium secondary battery, can also be used as an additive of a solid-state battery, and can achieve the effects of improving ion conduction and reducing interface impedance, thereby effectively improving the performance of the solid-state battery.

Electrolyte-infiltrated composite electrode includes an electrolyte component consisting of a polymer matrix with ceramic nanoparticles embedded in the matrix to form a networking structure of electrolyte. Suitable ceramic nanoparticles have the basic formula Li₇La₃Zr₂O₁₂ (LLZO) and its derivatives such as Al_xLi_7-xLa₃Zr_2-y-zTa_yNb_zO₁₂ where x ranges from 0 to 0.85, y ranges from 0 to 0.50 and z ranges from 0 to 0.75, wherein at least one of x, y and z is not equal to 0. The networking structure of the electrolyte establishes an effective lithium-ion transport pathway in the electrode and strengthens the contact between electrode layer and solid-state electrolyte resulting in higher lithium-ion electrochemical cell's cycling stability and longer battery life. Sold-state electrolytes incorporating the ceramic particles demonstrate improved performance. Large dimensional electrolyte-infiltrated composite electrode sheets can be used in all solid-state lithium electrochemical pouch cells which can be assembled into battery packs.

The invention discloses preparation and application of a non-woven multifunctional diaphragm. The preparation method comprises the following steps: (1) mixing deionized water and a formamide solutionwith a certain proportion with a commercial vanadium pentoxide drug, carrying out a hydrothermal reaction in a reaction kettle under certain conditions, and carrying out suction filtration and dryingto obtain a vanadium pentoxide nanosheet; (2) mixing the vanadium pentoxide nanosheet with a certain concentration with polyvinyl butyral ester, polyethylene glycol octylphenyl ether and dibutyl phthalate in absolute ethyl alcohol, drying to form a diaphragm, and testing the water absorption rate of the diaphragm; and (3) assembling the vanadium pentoxide nanosheet diaphragm with a certain concentration and two pieces of commercial carbon cloth with the same size into an energy storage device, exploring the optimal concentration of the vanadium pentoxide nanosheet of the diaphragm, and calculating the ionic conductivity of the vanadium pentoxide nanosheet. According to the invention, the diaphragm which is low in cost, high in ionic conductivity, stable in electrochemical performance and adjustable in adsorbability is prepared through the method which is simple and rapid to operate, and a new thought is provided for research and development of diaphragms of energy storage devices.

The invention belongs to the technical field of battery materials, and discloses a method for performing sulfur-doped phosphorus modification on a carbon surface and application of the method, the method comprises the following steps: mixing a phosphorus source and a sulfur source, and then performing heat treatment on the mixed phosphorus-sulfur mixed material and a raw material with a carbon-based surface at 300-600 DEG C to obtain a product, the introduction of sulfur can improve the deposition efficiency, uniformity and environmental stability of the phosphorus element on the carbon-based surface in the heat treatment process, and the correspondingly obtained material has a sulfur-doped phosphorus interface layer. According to the method disclosed by the invention, the high-performance battery negative electrode material with the sulfur-doped phosphorus interface layer can be particularly obtained, the high-performance battery negative electrode material is used as an alkali metal ion battery, and the sulfur-doped phosphorus interface layer has good environmental stability, so that the material can be used for manufacturing a battery electrode by using a water-based binder; and phosphides generated in the circulation process can improve the ionic conductivity of the material, so that the fast charging performance of the battery is improved.

The invention relates to a lithium-sulfur battery technology, and aims to provide a preparation method of a conductive adhesive based on reinforced polysulfide ion adsorption. The preparation method comprises the following steps: adding beta-cyclodextrin dissolved by deionized water into an aniline solution, and performing ultrasonic dispersion and vacuum drying to obtain an aniline cyclodextrin inclusion compound; preparing a solution from the aniline cyclodextrin inclusion compound and deionized water; dropwise adding hydrogen peroxide, and carrying out ultrasonic dispersion to polymerize aniline in the adjacent aniline cyclodextrin inclusion compound; and drying in vacuum to obtain the conductive adhesive. Compared with a traditional binder, the product has excellent electrical conductivity, the electrode impedance can be greatly reduced, and the used binder is environmentally friendly and green. The obtained modified porous carbon has the characteristics of large specific surface area and large pore volume, can carry more sulfur, has very strong polysulfide adsorption capacity, is favorable for inhibiting shuttling of polysulfide ions due to iron oxide dispersed on the inner wall of the carbon, is suitable for preparing a high-performance sulfur electrode material, and prolongs the service life of a sulfur battery.

Disclosed are a lithium salt expressed by a formula, LiAlX_n(OY)_4-n, where “X” is an electrophilic substituent group and “Y” is an oligoether group, an ionic conductor with the lithium salt dispersed in a structural member, and a liquid electrolyte with the lithium salt dissolved in a solvent. For example, the ionic conductor exhibits high ionic conductivity as well as high lithium ion transport number.