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

The present invention provides a composite ion exchange membrane which has high mechanical strength and is suitable for use as a solid polymer electrolyte membrane excellent in ionic conductivity and a method for its production. The invention is achieved by a composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed of polybenzazole polymer, the support membrane being impregnated with ion exchange resin, and surface layers formed of ion exchange resin free of support membranes, the surface layers being formed on both surfaces of the composite layer so as to sandwich the composite layer therebetween.

Provided are a multi-layered structure electrolyte including a gel polymer electrolyte on opposite surfaces of a ceramic solid electrolyte, for a lithium ion secondary battery including positive and negative electrodes capable of intercalating/deintercalating lithium ions, and a lithium ion secondary battery including the electrode. The electrolyte includes a gel polymer electrolyte on opposite surfaces of a ceramic solid electrolyte.

First, second and third dopes 114, 115 and 116 each of which contains a solid electrolyte and an organic solvent are cast from a casting die 81 provided with a feed block 119 to a moving belt 82. A three-layer casting membrane 112 is peeled off from the belt 82 as a three-layer membrane 62 containing the organic solvent. After being dried in a tenter device 64, the membrane 62 still containing the organic solvent is contacted with a liquid which is a poor solvent of the solid electrolyte and having lower boiling point than the organic solvent. Thereafter, the membrane 62 is transported to a drying chamber 69 and dried while being supported by the plural rollers.

The invention relates to a cathode active substance of a lithium ion battery. The cathode active substance contains carbon material and metal oxide; the metal oxide is clad on the surface of the carbon material and adopts one or some of s IIA, IIIA, IB, IB, IIIB and IVB metal oxides in an element periodic table. The battery prepared and obtained by the cathode active substance has good safe performance and electrical chemical property.

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.

The present disclosure relates to an electrolyte for a lithium secondary battery capable of improving safety and reliability of the lithium secondary battery and a lithium secondary battery comprising the electrolyte. The electrolyte for a lithium secondary battery of the present embodiments comprises a non-aqueous organic solvent, a lithium salt, flame retarding materials of fluoroalkyl ether and phosphazene, and a solvent comprising at least one ester.

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.

The invention provides sulfide solid electrolytes shown by a formula (I) and sulfide solid electrolytes shown by a formula (II). The invention further provides a design thought and a preparation method of the sulfide solid electrolytes. A certain amount of oxide is doped and added to or compounded to the sulfide solid electrolytes, the air stability of the sulfide solid electrolytes is improved, and the ionic conductivity of the sulfide solid electrolytes is kept.

The invention provides an alkali metal flow battery comprising a positive electrode current collector, a negative electrode, positive electrode slurry, a negative electrode electrolyte, a separation film, an encapsulation shell, a positive electrode slurry storage tank, and a negative electrode electrolyte storage tank. The positive electrode current collector, the negative electrode, the separation film, part of the positive electrode slurry, and part of the negative electrode electrolyte are accommodated in the encapsulation shell. The separation film is positioned between the positive electrode current collector and the negative electrode, and separates the positive electrode slurry and the negative electrode electrolyte. The positive electrode slurry comprises a positive electrode active material, a conductive agent, and positive electrode electrolyte. The negative electrode is an alkali metal electrode. The invention also provides the application of the alkali metal flow battery in large-scale electricity storage in solar power generation or wind power generation.

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.

The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to an anion exchange membrane capable of being used for an alkaline fuel cell and a preparation method thereof. The preparation method comprises the following steps of: mixing a polymer monomer and polymeric ionic liquid in a mole ratio of 1:2-1:9; adding a cross-linking agent and an initiating agent; carrying out ultrasound on the mixed liquor to ensure that the mixed liquor is mixed uniformly; and carrying out in-situ polymerization to prepare the polymer anion exchange membrane, wherein the monomer is a mixture which is selected from one or more than two of acrylonitrile, styrene, alpha-methyl styrene, and alpha-methacrylonitrile. The preparation method is simple, more economic and more environment-friendly; compared with the anion exchange membrane reported in the prior art, the obtained anion exchange membrane can guarantee higher ionic conductivity, good alkali-resisting property, good heat stability and chemical stability, and can furthermore obtain good mechanical property.

A nanoporous polymer electrolyte and methods for making the polymer electrolyte are disclosed. The polymer electrolyte comprises a crosslinked self-assembly of a polymerizable salt surfactant, wherein the crosslinked self-assembly includes nanopores and wherein the crosslinked self-assembly has a conductivity of at least 1.0×10⁻⁶ S/cm at 25° C. The method of making a polymer electrolyte comprises providing a polymerizable salt surfactant. The method further comprises crosslinking the polymerizable salt surfactant to form a nanoporous polymer electrolyte.

The invention belongs to the technical field of batteries and particularly relates to a low-temperature zinc ion battery, comprising a cathode, an anode, and low-temperature electrolyte. The cathode is made from organics containing carbonyl functional groups, such as quinones, embedded compounds that may reversely dis-embed Zn2+, Li+ and Na+, or Prussian blue derivatives. The anode comprises a metal zinc sheet, zinc foil, zinc powder, a powdery porous zinc electrode, zinc alloy, or a zinc-based material applied to/deposited on another conductive substrate. The low-temperature electrolyte usesethyl acetate and its derivatives, or quinones or their derivatives as solvents, uses an organic zinc salt or inorganic zinc salt as a solute, and has a concentration of 0.01-10 mol/L. The low-temperature zinc ion battery may allow reversible charging and discharging through cathodic enolization and anode zinc dissolution/precipitation mechanism, and still has high specific capacity, high energy density, long cycle life and excellent power performance at the extreme low temperature (-70 DEG C).

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.

The invention concretely relates to a lithium ion secondary battery composite electrolyte film, and a making method and an application thereof. The making method of the lithium ion secondary battery composite electrolyte film comprises the following steps: 1) preparing inorganic electrolyte powder with the diameter of 10-100nm; 2) preparing a surface modified inorganic electrolyte powder material; and 3) making the composite electrolyte film. The lithium ion secondary battery composite electrolyte film with the advantages of high ion conductivity, good flexibility and easy processing can be made by adopting a conductive polymer containing a small amount of a lithium salt as a flexible conductive skeleton and adopting the high conductivity characteristic of the surface silanized inorganic electrode material through a slurry coating technology.

Proton exchange membrane compositions having high proton conductivity are provided. The proton exchange membrane composition includes a hyper-branched polymer, wherein the hyper-branched polymer has a DB (degree of branching) of more than 0.5. A polymer with high ion conductivity is distributed uniformly over the hyper-branched polymer, wherein the hyper-branched polymer has a weight ratio equal to or more than 5 wt %, based on the solid content of the proton exchange membrane composition.

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.

An object of the present invention is to provide a method that is applicable to the production of a polymer electrolyte having high ion-exchange capacity, uniform crosslinking points and improve ionic conductivity, unlike conventional methods.

A method for synthesizing a polymer electrolyte comprises:

• 1^st step of maintaining a polymer having sulfonic acid groups and sulfonyl halide groups within the molecule at 0° C. or less in the presence of a base; and
• 2^nd step of carrying out a crosslinking reaction between the polymer prepared in the 1^st step and a cross-linking agent having one or more types of functional group selected from the group consisting of a disulfonyl amide group, a diamine group, a diol group and a dithiol group in an organic solvent.

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.

The invention discloses high-adhesiveness conducting self-healing hydrogel as well as a preparation method and application thereof. A gamma ray or electron beam initiation polymerization method is used; cationic monomers shown as a formula I and polymerizable hydrophilic anion monomers are polymerized in an inorganic filler aqueous dispersion dissolved with polysaccharides; the physical crosslinking self-healing hydrogel is obtained. The self-healing hydrogel has the excellent characteristics of high response and self healing capability; the repeated use can be realized; high ionic conductivity, good biocompatibility and high adhesiveness are realized; the adhesive force on a conducting copper sheet can reach 60.5MPa. The gamma ray or electron beam irradiation method is used, so that the preparation method is simpler; safety and environment protection are realized; the energy consumption is low; the preparation method is very suitable for industrial production. The high-adhesiveness conducting self-healing hydrogel related by the invention is hopeful to be used in the fields of electronic device bonding agents, medical device bonding agents, tissue repair and the like.

The embodiment of the invention relates to a flexible ceramic matrix composite solid electrolyte and a preparation method thereof, a solid battery and electronic equipment. The flexible ceramic matrixcomposite solid electrolyte comprises an inorganic solid electrolyte ceramic matrix and an organic additive having a lithium conducing capability and lithium salt. The inorganic solid electrolyte ceramic matrix is prepared by utilizing a material containing an inorganic solid electrolyte and a binder by adopting a dry method; the organic additive with the lithium conducting capability and the lithium salt are filled in the inorganic solid electrolyte ceramic matrix. The flexible ceramic matrix composite solid electrolyte has good flexibility, high ionic conductivity, good electrochemical stability and good interface stability.

The invention discloses a preparation method of ceramic-based composite solid-state electrolyte. The specific preparation method is characterized by comprising the following steps: preparation of gelelectrolyte, preparation of ceramic-based electrolyte and preparation of ceramic-based composite electrolyte, wherein the preparation of the gel electrolyte comprises the steps: mixing an acrylate material, a crosslinking agent and electrolyte, adding an initiator into the mixed solution and uniformly stirring after adding the initiator; in step 2, the preparation of the ceramic-based electrolytecomprises the following steps: preparing a binding agent and an N-methylpyrrolidone solvent into a solution according to the mass ratio of 1 to (10 to 20); weighing a fast ion conductor and lithium salt according to a stoichiometric ratio and adding into the solution; carrying out stirring, ultrasonic treatment and the like to obtain uniformly-dispersed slurry; uniformly coating the slurry on a glass plate and drying at 30 to 60 DEG C for 24h; then drying for 24h in vacuum and at 50 to 60 DEG C, so as to obtain an electrolyte film with the thickness of 10 to 150mu m.

A nanocomposite including: a sulfonated polysulfone and a nonmodified clay dispersed in the sulfonated polysulfone, the nonmodified clay having a layered structure, and the nonmodified clay being intercalated with the sulfonated polysulfone, or the layers of the layered structure being exfoliated, a nanocomposite electrolyte membrane and a fuel cell using the same. In the nanocomposite, a nanoscale amount of the nonmodified clay, which has a layered structure, is dispersed in sulfonated polysulfone having excellent ionic conductivity. Thus, the nanocomposite has excellent ionic conductivity and mechanical properties. The nanocomposite electrolyte membrane formed using this nanocomposite has an improved ability to suppress permeation of polar organic fuels, such as methanol, while maintaining appropriate ionic conductivity. In addition, the fuel cell with the nanocomposite electrolyte membrane can effectively prevent crossover of methanol used as a fuel, thereby providing improved working efficiency and an extended lifespan.

The invention provides sulfide electrolyte materials shown by a formula (I) and sulfide electrolyte materials shown by a formula (II). The invention further provides a design thought and a preparation method of the sulfide electrolyte materials. A certain amount of lithium phosphate is doped and added to or compounded to sulfide solid electrolytes, and the ionic conductivity of the sulfide electrolyte materials is improved.

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.

The invention discloses a preparation technology of a solid-state lithium ion battery. The preparation technology comprises the following steps: step one, uniformly mixing inorganic ceramic electrolyte powder, a binding agent and lithium salt in an organic solvent, thus obtaining coating slurry; respectively coating the surfaces of a positive plate and a negative plate with the coating slurry; drying, thus obtaining an integrated electrode material of which the coating thickness is 10 to 100 mum and which is coated with the inorganic ceramic electrolyte . The preparation technology disclosed by the invention has the advantages that dual-solid-state electrolyte structure is adopted, electrolyte in the structure integrates an all-solid-state lithium ion battery having high ionic conductivityand excellent interface contact performance, and the all-solid-state lithium ion battery has higher specific capacity and excellent cycling stability; the preparation method is simple, the cost is low, the electrochemical performance is excellent, and a wide application prospect and advantages are obtained.

The present invention belongs to the field of solid electrolyte material, and provides one kind of solid electrolyte crystal material and the preparation process of its crystal film. The crystal material has the chemical expression of Rb0.5Cs0.5Ag4I5, cubic crystal structure under room temperature with lattice constant of a=1.131 nm. The preparation process of the crystal film includes compounding with RbI, CsI and AgI mixture (RbxCs1-xI)y(AgI)1-y, where x=0.5 and y=0.15-0.16; and vacuum evaporation coating for epitaxial growth of crystal film on newly cleaved NaCl crystal chip in a vacuum chamber of 0.002 Pa below pressure and at 55-75 deg.c with the film depositing rate being 5-15 nm/s.

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.

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.

Disclosed is a method of preparing a solid electrolyte, which includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution including a metal precursor solution, containing a lanthanum precursor, a zirconium precursor and an aluminum precursor, a complexing agent, and a pH controller to coprecipitation, (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry, (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source, and (d) preparing an aluminum-doped lithium lanthanum zirconium oxide (LLZO) solid electrolyte by calcining the mixture, and which is also capable of adjusting the aluminum content of a starting material to thus control sintering properties and of adjusting the composition of a precursor and a lithium source to thus control the crystal structure, thereby improving the ionic conductivity of the solid electrolyte. In addition, a method of manufacturing an all-solid-state lithium secondary battery, including a solid electrolyte having improved ion conductivity, can be provided using the method of preparing the solid electrolyte.