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137results about How to "Improve ionic conductivity" patented technology

High-energy flexible electrode material, preparation method thereof and application in secondary battery

The invention belongs to the field of an electrochemistry battery, in particular to a high energy flexible electrode material and a preparation method thereof and application thereof in a high-energy flexible lithium sulfur storage battery. The preparation method for the flexible electrode material comprises the following steps: elementary sulfur is uniformly absorbed and embedded in micropores of a carbon nanometer tube wall to form micropore domain limiting carbon nanometer tube/sulfur composite material with an interconnected porous channel and a three-dimensional electric conduction network, wherein the content of the active substance. i.e. elementary sulfur is in the range of 10-71wt%; an acidic electrolyte anodic oxidation metal substrate containing sulfate ions is used for preparing a porous template, and a large number of sulfate ions are absorbed in the template; a carbon nanometer tube is prepared in a chemical vapor deposition process; meanwhile, the high temperature in-situ carbon heating is used for restoring the sulfate ions to form the elementary sulfur embedded in the tube wall of the carbon nanometer tube; after the porous template is removed, the carbon nanometer tube/sulfur flexible composite material is obtained in a solvent ultrasonic dispersion and liquid phase evaporation self-assembly process. The flexible electrode material can be applied to the positive electrode materials of a lithium sulfur battery and a flexible power storage device.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Hollow structure material as well as preparation method and use thereof

The invention discloses a hollow structure material. The hollow structure material comprises silicon particles and an amorphous carbon shell, wherein the silicon particles are arranged in the amorphous carbon shell. The hollow structure material has the advantages that a hollow part between a silicon kernel and the carbon shell can be used for volume expansion of silicon; direct contact between the silicon and an electrolyte solution is blocked by a carbon shell membrane of a surface layer, so that a steady solid-state electrolyte solution interface can be formed on the surface of the carbon shell; and amorphous carbon is high in electronic conductivity and high in ionic conductivity, so that lithium ions and electrons can be freely transported through the amorphous carbon. A carbon-coated hollow material is applied to an existing slurry coating method electrode preparation technology and lays a foundation for industrial application. The invention also discloses a preparation method of the hollow structure material. The preparation method does not relate to dangerous gas such as silicane or similar expensive instruments for chemical vapor deposition. The large-scale production manufacturing of the hollow structure material is easily realized. A production condition control requirement is not strict, so that the hollow structure material is high in repeatability.
Owner:NANJING AMPRIUS

Method for preparing flexible three-dimensional solid electrolyte membrane

ActiveCN107887554AImprove ionic conductivityExcellent electrochemical stability and flexibilitySolid electrolytesSecondary cellsSolventCeramic particle
The invention belongs to the technical field of lithium ion batteries and relates to a method for preparing a flexible three-dimensional solid electrolyte membrane. The method comprises the followingsteps: adding nano fibers into a solvent to prepare nano fiber suspension; adding lithium-ion conductive ceramic particles into the nano fiber suspension, stirring at high speed, and performing freezedrying so as to obtain a ceramic particle/nano fiber three-dimensional porous composite scaffold; adding lithium salt into an acetonitrile solution of polyethylene oxide, and stirring at high speed so as to obtain a lithium salt-polyethylene oxide mixed solution; soaking the ceramic particle/nano fiber three-dimensional porous composite scaffold into the lithium salt-polyethylene oxide mixed solution, drying and performing hot-pressing treatment, thereby obtaining the flexible three-dimensional solid electrolyte membrane. According to the method disclosed by the invention, the lithium-ion conductive ceramic particles are uniformly attached onto the nano fibers to form the three-dimensional porous scaffold, so that the transmission path of lithium ions in a polymer matrix is lengthened, and the solid composite electrolyte membrane has high ionic conductivity, excellent electrochemical stability and flexibility at room temperature.
Owner:柔电(武汉)科技有限公司

Inorganic/organic composite thin film solid-state electrolyte for lithium metal battery and preparation method of inorganic/organic composite thin film solid-state electrolyte

The invention belongs to the technical field of a lithium metal battery, and particularly relates to an inorganic/organic composite thin film solid-state electrolyte for the lithium metal battery. The inorganic/organic composite thin film solid-state electrolyte comprises a ceramic nanowire network framework, an inorganic electrolyte and a polymer electrolyte, wherein the inorganic electrolyte is combined with the ceramic nanowire network framework by a magnetron sputtering method, and the polymer electrolyte is combined with the inorganic electrolyte and the ceramic nanowire network framework in an in-situ way. Compared with the prior art, the ceramic nanowire network framework with a unique structure is used, and the multi-layer network-structure inorganic/organic composite thin film solid-state electrolyte is prepared on the basis; and moreover, by optimizing and improving the interface compatibility and stability of the inorganic/organic composite thin film solid-state electrolyte and a metal lithium electrode, rapid ion transmission is achieved, the growth of lithium dendrites is suppressed, the penetrating of the lithium dendrites is prevented, and the cycle stability and the safety of the lithium metal battery are improved.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1

Solid electrolyte membrane, preparation method of solid electrolyte membrane, and lithium ion battery

The invention discloses a solid electrolyte membrane, a preparation method of the solid electrolyte membrane, and a lithium ion battery. The solid electrolyte membrane is a material of a composite structure, wherein the material is formed by compounding lithium inorganic solid electrolyte and a polymer; a polymer with a continuous three-dimensional sponge network structure is filled with the lithium inorganic solid electrolyte; the primary particle size of the lithium inorganic solid electrolyte is 0.01-3 microns; the polymer has the continuous three-dimensional sponge network structure; the diameter of the polymer in the network structure is 0.002-0.5 micron; a weight ratio of the lithium inorganic solid electrolyte to the polymer is 70:30 to 95:5; the composite structure has pores; the size of each pore is 0.01-3 microns; a ratio of the pore volume to the volume of the whole composite material is 1-15%; the overall thickness of the composite material is 1-50 microns; and the tensile strength is higher than 10MPa. According to the solid electrolyte membrane disclosed by the invention, high ionic conductivity of the lithium inorganic solid electrolyte can be maintained, and excellent processability, mechanical property, corrosion resistance and oxidation resistance can be provided.
Owner:上海纳晓能源科技有限公司

All-solid-state lithium-ion battery and manufacturing method thereof

The invention discloses an all-solid-state lithium-ion battery and a manufacturing method thereof. The manufacturing method comprises the following steps of (1) dissolving a polymer electrolyte into a solvent to prepare a glue solution; (2) fully mixing a positive electrode host material, a conductive agent and the glue solution obtained in the step (1), coating a positive current collector, heating the positive current collector and then carrying out co-curing to obtain a positive electrode plate, fully mixing a negative electrode host material, the conductive agent and the glue solution obtained in the step (1), coating a negative current collector, heating the negative current collector and then carrying out co-curing to obtain a negative electrode roll; (3) carrying out mechanical ball milling on a sulfide electrolyte, dissolving the product into the solvent to prepare slurry, coating the surface of the negative electrode roll, heating the negative electrode roll and then curing the negative electrode roll to obtain a negative electrode plate; and (4) assembling the positive electrode plate and the negative electrode plate by adopting a lamination technology to obtain the all-solid-state lithium-ion battery. Compared with the prior art, the all-solid-state lithium-ion battery disclosed by the invention has relatively low DC resistance, relatively high ionic conductivity and good cycle performance.
Owner:SHANGHAI AEROSPACE POWER TECH

High-ion-conductivity sulfide solid electrolyte based on liquid phase method and preparation method thereof

ActiveCN109888378AEliminates ion transmission lossImprove ionic conductivitySecondary cellsIonThermal treatment
The invention discloses a high-ion-conductivity sulfide solid electrolyte based on a liquid phase method and a preparation method thereof. The preparation method comprises the following steps: (1) adding raw materials at least comprising Li2S and P2S5 and a solvent into a stirring container, stirring, performing vacuum filtration, and drying under reduced pressure to obtain a mixture a; (2) filling the mixture a in the step (1) into a ball milling tank, vacuumizing, and performing ball milling to obtain a mixture b; (3) and taking out the mixture b in the step (2) from a glove box, and performing heat treatment under the protection of inert atmosphere to obtain the high-ion-conductivity sulfide solid electrolyte material. According to the invention, the porous structure introduced by solvent and crystallization solvent molecules in the obtained sulfide solid electrolyte is eliminated by secondary ball milling under reduced pressure after drying under reduced pressure, so that the high-ion-conductivity sulfide solid electrolyte is obtained. The invention further adopts a hot pressing or hot paired roller mode for molding, thereby enhancing the combination effect of the sulfide solidelectrolyte and further improving the ionic conductivity.
Owner:NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD

Alkaline polyarylether ionomer material with microphase separation structure and preparation and application thereof

The invention discloses an alkaline polyarylether ionomer with microphase separation structure. A molecular structure thereof comprises a long series hydrophilic chain segment and a long series hydrophobic chain segment. The invention also discloses a preparation method for the alkaline polyarylether ionomer, which comprises the following steps of polymerizing two (4,4'-hydroxyphenyl) diphenylmethane and dihalogen monomer with an Ar1 structure for preparing the hydrophilic chain segment, polymerizing double hydroxyl aromatic monomer with an Ar2 structure and the dihalogen monomer with the Ar1 structure for preparing the hydrophobic chain segment, carrying out condensation polymerization reaction on the hydrophilic chain segment and the hydrophobic chain segment so as to obtain polyarylether, thus obtaining the polyarylether ionomer through functionalization technologies such as chloromethylation, quaternization, alkalization and the like. The invention also discloses the application of the alkaline polyarylether ionomer. The alkaline polyarylether ionomer has obvious microphase separation structure, realizes the separation of hydrophilic structure and the hydrophobic structure, and has good alcohol resistance, chemical stability, heat stability, mechanical property and electrical property when being used in anion-exchange membrane of an alkaline fuel cell.
Owner:SOUTH CHINA UNIV OF TECH

Anion-cation double-doped lithium iron phosphate anode material and preparation method thereof

The invention discloses an anion-cation double-doped lithium iron phosphate anode material and a preparation method thereof, and belongs to the field of new energy materials. The anode material is a compound of magnesium-fluorine double-doped lithium iron phosphate and carbon, the magnesium ion part replaces the position of a iron ion in a lithium iron phosphate crystal, and the fluoride ion part replaces the position of a phosphoric acid ion in the lithium iron phosphate; main components of the anode material can be expressed as follows: LiFe(1-x)Mgx(PO4)(1-y)F3y/C, wherein x is equal to or greater than 0.001 and is equal to or less than 0.1, and y is equal to or greater than 0.001 and is equal to or less than 0.1. The anode material is prepared by using raw materials of lithium sources, ferrous sources, phosphorus sources, magnesium sources, fluorine sources and carbon sources through a high temperature solid phase method. According to the invention, positive active materials adopts the characteristics of high rate capability, good cycling performance, and the like of a positive active material, so that the capacity remains 98 mAh/g under 10C multiplying power, and the capacity retention ratio remains 98.4% under 1C multiplying power for the circulation of 150 times.
Owner:上海微纳科技有限公司
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