411results about "Composite electrolytes" patented technology

The invention relates to a composite solid electrolyte membrane with high ceramic content and a preparation method and application thereof. The preparation method comprises the following steps: mixing ceramic solid electrolyte particles activated by a silane coupling agent with an in-situ polymerization solution containing a cross-linking agent, an organic monomer, a plasticizer, a lithium salt, an ultraviolet light initiator and a thermal initiator to form solid electrolyte slurry, wherein the ceramic solid electrolyte particles account for 60-90% of the total mass of the composite solid electrolyte membrane; the preparation method comprises the following steps: coating a positive pole piece with solid electrolyte slurry, initiating shallow organic matter monomers and a cross-linking agent to generate in-situ polymerization through an ultraviolet light initiator, covering a negative pole piece for hot pressing treatment, initiating residual organic matter monomers and the cross-linking agent to generate in-situ polymerization through a thermal initiator, and forming a composite electrolyte membrane with high ceramic content. The invention also discloses an all-solid-state battery containing the composite solid electrolyte membrane. The solid-state battery containing the in-situ formed composite solid-state electrolyte membrane has relatively high cycling stability.

The invention provides a wide-temperature-range chargeable and dischargeable semi-solid-state battery, a preparation method thereof and electric equipment, and relates to the technical field of new energy. According to the wide-temperature-range chargeable and dischargeable semi-solid-state battery provided by the invention, the solid-state electrolyte is added into the positive electrode material, and the diaphragm is coated with the solid-state electrolyte layer, so that atomic-scale contact between the solid-state electrolyte and the surfaces of electrode material particles is fully realized, and the thermal stability of the battery is greatly improved; meanwhile, the problem of slow reaction kinetics at low temperature is solved by using the nano solid electrolyte blended positive electrode material, and the low-temperature cycle performance of the battery is improved; the nanometer solid electrolyte coating diaphragm can solve the problem of poor electrolyte capacity diving, the electrolyte injection coefficient is effectively reduced, meanwhile, low internal resistance is achieved, and the long cycle stability of the battery is further improved; and a coating layer can be formed on the surface of the material by using the coating type binder, so that the side reaction between the electrode material and an electrolyte is effectively reduced, and the dissolution of transition metal Fe ions is remarkably inhibited.

The invention provides a high-temperature-resistant fast-charging PVDF-HFP-based all-solid-state electrolyte membrane as well as a preparation method and application thereof, and relates to the technical field of power batteries. The preparation method comprises the following steps: uniformly mixing a polyvinylidene fluoride-hexafluoropropylene copolymer, a lithium salt and a polar solvent to obtain a PVDF-HFP solution; then uniformly mixing the PVDF-HFP solution with a cross-linking agent and a 2, 2-bis (4-allyloxy-3, 5-dibromophenyl) propane monomer, so as to obtain a precursor solution; uniformly mixing an initiator with the precursor solution to obtain a reaction solution; and finally, coating a substrate with the reaction solution, and heating at 70-80 DEG C for 12-16 hours to obtain the high-temperature-resistant fast-charging PVDF-HFP-based all-solid-state electrolyte membrane. When the high-temperature-resistant and fast-charging PVDF-HFP-based all-solid-state electrolyte membrane is applied to a lithium metal battery, the thermal safety and the high-temperature-resistant and fast-charging performance can be remarkably improved.

The present invention relates to a composite sulfide electrolyte, and a preparation method therefor and a use thereof. The composite sulfide electrolyte has a three-dimensional crosslinked structure formed by connecting a sulfide electrolyte and a dynamic bond-containing crosslinked polymer by means of chemical bonds. The polymer contains a sulfur element and exhibits relatively higher stability when interacting with the sulfide electrolyte, the chemical crosslinking between the sulfide electrolyte and the dynamic bond-containing crosslinked polymer is formed by means of multiple chemical bonds, such as a disulfide bond and an amido bond, and a strong binding force and self-healing function are provided, in order to simultaneously solve the problems of interfacial delamination and cracking caused by mechanical stress inside the sulfide electrolyte. When applied in an all-solid-state battery, the composite sulfide electrolyte can improve the limiting current density and cycle stability of the all-solid-state battery.

The invention discloses a biosynthetic bacterial cellulose-based solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolytes. The solid electrolyte is prepared by taking modified bacterial cellulose prepared by fermenting acetobacter xylinum, rhizobium, pseudomonas, azospirillum, alcaligenes and other bacteria as a substrate, introducing a low-molecular-weight polymer to regulate and control the arrangement of cellulose molecular chains to serve as a conductive ion framework, and then compounding a conductive ion high-molecular-weight polymer and a lithium salt. According to the invention, cellulose molecular chains are modified by modified glucose, and a network structure is regulated and controlled by a low-molecular-weight polymer, so that the problems of small spacing, lack of ion coordination sites and weak ion transmission capability of pure cellulose molecular chains are effectively solved, the ionic conductivity of the prepared solid electrolyte can reach 10 <-4 > S cm <-1 >, the electrochemical window width reaches 5V, and the solid electrolyte has a good application prospect. The material can tolerate high critical current density, is suitable for various positive electrode materials, and is suitable for high-voltage and long-cycle-life energy storage devices.

The invention discloses a composite sulfide solid-state electrolyte and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The composite sulfide solid electrolyte comprises sulfide solid electrolyte particles and nano ion conductor particles which are stable to water vapor, wherein the nano ion conductor particles are uniformly distributed on the surfaces and gaps of the sulfide solid electrolyte particles to form a composite structure. Therefore, through the composite structure that the nano ion conductor particles are uniformly distributed on the surfaces of the sulfide particles and in the gaps, the surface coverage of the sulfide solid electrolyte can be increased, the hydrolysis reaction rate can be reduced, and the sulfide solid electrolyte is well protected while the reduction amplitude of the lithium ion conductivity is reduced; the stability to air is improved; and the electrochemical stability is also improved. In addition, the method is simple in process, has good mass production capacity, and has high application value for actual production.

The invention discloses a composite solid electrolyte and a preparation method and application thereof, and belongs to the technical field of solid lithium batteries. The composite solid electrolyte comprises a polymer matrix, a lithium salt and a lithium ion modified ionic metal organic framework (MOF) material. The metal center of the ion-conducting MOF material can be selected from Zr, Ti, Hf and the like, and the organic ligand can be selected from organic acids containing sulfydryl, sulfo groups and the like. The MOF material can effectively inhibit crystallization of a polymer matrix and increase the proportion of an amorphous region, Lewis acid sites on the surface of the MOF material can promote dissociation of lithium salt, and a lithium ion coordination channel formed in the MOF material can provide an extra rapid transmission path for lithium ions. When the electrolyte is applied to the solid-state lithium battery, the growth of lithium dendrites can be effectively inhibited, and the rate capability, the cycling stability and the safety of the battery can be remarkably improved.

A gel polymer electrolyte for a lithium battery and a lithium battery including the gel polymer electrolyte are disclosed. The gel polymer electrolyte includes a gel polymer and a liquid electrolyte, the gel polymer may be i) a crosslinked product of a polyfunctional acryl-based monomer having 3 or more polymerizable functional groups, or ii) a crosslinked product of a first polymerizable monomer and a second polymerizable monomer, the first polymerizable monomer being a polyfunctional acryl-based monomer having 3 or more polymerizable functional groups, and the second polymerizable monomer being one or more selected from among a urethane acryl-based monomer having two or more polymerizable functional groups and a polymerizable monomer having two or more polymerizable functional groups and containing a perfluoropolyether unit, wherein the liquid electrolyte includes a lithium salt, an organic solvent, and butyronitrile, and the lithium salt may include lithium difluoro(oxalato)borate and lithium tetrafluoroborate.

The invention discloses a composite solid electrolyte layer, a preparation method and application, the composite solid electrolyte layer comprises a porous membrane laminated on a negative pole piece, and pores in the porous membrane and gaps between the porous membrane and the negative pole piece are filled with in-situ generated polymers. Inorganic solid electrolyte is also dispersed in the porous membrane, and lithium salt is dispersed in the polymer and the porous membrane. The composite solid electrolyte layer is obtained through in-situ polymerization of a polymer in pores in the porous membrane and gaps between the porous membrane and the negative electrode plate, and a novel interface structure with the electrode-electrolyte integration characteristic is constructed. By adopting a collaborative optimization strategy of a polymer matrix and inorganic filler double-crosslinking network system and an interface stable layer, the volume effect problem of a silicon-based negative electrode, the electrolyte interface impedance problem and the battery safety problem can be solved at the same time, so that the cycling stability and the rate capability of the lithium ion battery are remarkably improved.

The invention relates to a composite solid-state electrolyte membrane and a preparation method thereof, a lithium ion battery and an electric device, the composite solid-state electrolyte membrane comprises a lithium phosphorus oxygen nitrogen solid-state electrolyte, the general formula of the lithium phosphorus oxygen nitrogen solid-state electrolyte is LixPOyNz, x is greater than 2.7 and less than or equal to 3, zlt; 0.45, 3 < (y + z) < 4; along the thickness direction of the solid electrolyte membrane, the nitrogen doping ratio of the lithium-phosphorus-oxygen-nitrogen solid electrolyte in the composite solid electrolyte membrane is gradually increased, and the corresponding oxidation stoichiometric number is gradually reduced. According to the composite solid electrolyte membrane, the capacity retention ratio, the cycling stability and the safety of the lithium ion battery are improved.

The invention belongs to the field of solid-state batteries, and particularly relates to a solid-state battery and a composite electrolyte, preparation and application thereof, and the preparation method of the composite electrolyte comprises the following steps: dissolving a base membrane polymer with a solvent A to obtain a base membrane solution, and forming the base membrane solution into a wet membrane; pre-forming the wet film in an environment with the humidity of 50-80% RH in advance; soaking the wet film in a solvent B, and forming the wet film into a base film; and compounding the base membrane and a precursor solution for forming the electrolyte, and then carrying out in-situ polymerization to prepare the composite electrolyte, wherein the base membrane polymer comprises at least one of polyether sulfone, sulfonated polyether sulfone and polyetherimide; the solvent B is a mixed solvent of water and C1-C4 alcohol, and the volume ratio of the water to the C1-C4 alcohol is 1: (0.1-10); the precursor solution is a solution containing a monomer, a plasticizer and electrolytic salt. The method provided by the invention can be used for preparing the solid electrolyte with a special structure and excellent performance such as fast charge stability.

The invention discloses a preparation method of a composite gel electrolyte and the composite gel electrolyte. The preparation method comprises the following steps: modifying an inorganic oxide, preparing a gel precursor solution, and preparing an organic-inorganic composite gel electrolyte. Epoxy groups are grafted on the surfaces of modified inorganic particles, and the modified inorganic particles serve as hybridization centers to participate in ring-opening polymerization reaction and are combined with polymer molecules to form a cross-linked network, so that the orderliness of polymer chain segments is destroyed, the crystallinity is reduced, a new ion transmission path is provided, particle dispersion and agglomeration are reduced, and the ionic conductivity of electrolyte is promoted to be improved. According to the selected polymerization mode, the common Lewis acid lithium salt in the electrolyte is used as an initiator, additional introduction of the initiator and heating are not needed, and adverse effects such as initiator residue and decomposition gas production can be effectively avoided.

The invention provides a solid-state electrolyte membrane based on a bicontinuous lithium-conducting network and a preparation method and application of the solid-state electrolyte membrane. The solid electrolyte membrane comprises a three-dimensional ceramic lithium-conducting network, and the three-dimensional ceramic lithium-conducting network is a three-dimensional continuous porous ceramic skeleton; pores of the three-dimensional ceramic lithium-conducting network are filled with the cross-linked polymer lithium-conducting network; the cross-linked polymer lithium-conducting network contains lithium salt and a plasticizer; wherein the three-dimensional ceramic lithium-conducting network and the cross-linked polymer lithium-conducting network form a space interpenetrating structure through physical interlocking and / or chemical bonding, and Li < + > migration paths of the three-dimensional ceramic lithium-conducting network and the cross-linked polymer lithium-conducting network are continuously communicated at least in the thickness direction. According to the high-strength solid-state electrolyte membrane based on the bicontinuous lithium conduction network, through the synergistic effect of the ceramic network and the polymer network, the cycle performance of a lithium battery is improved while the mechanical and electrochemical aspects are remarkably improved, and the high-strength solid-state electrolyte membrane is suitable for large-scale application of a high-energy-density solid-state battery.

Provided are solid-state hybrid electrolytes. The hybrid electrolytes have a polymeric material layer, which may be a polymer copolymer layer or a gel polymer copolymer layer, disposed on at least a portion of an exterior surface or all of the exterior surfaces of a solid-state electrolyte. A hybrid electrolyte can form an interface with an electrode of an ion-conducting battery that exhibits desirable properties. The solid-state electrolyte can comprise a monolithic SSE body, a mesoporous SSE body, or an inorganic SSE having fibers et strands, which may be aligned. In the case of solid-state electrolytes that have strands, the strands can be formed using a sacrificial template. The hybrid solid-state electrolytes can be used in ion-conducting batteries, which may be flexible, ion-conducting batteries.

The embodiment of the invention discloses a preparation method of a solid electrolyte membrane and the solid electrolyte membrane. The preparation method of the solid electrolyte membrane comprises the following steps: providing a composite fiber solution, a thermoplastic elastomer solution, a solid electrolyte matrix and a positive electrode material; performing coaxial electrostatic spinning treatment on the composite fiber solution and the thermoplastic elastomer solution to obtain a fiber adhesive; carrying out ball milling treatment on the fiber adhesive, the solid electrolyte matrix and the positive electrode material to obtain a fibration mixture; and carrying out hot rolling treatment on the fiberized mixture to obtain the solid electrolyte membrane. According to the preparation method provided by the invention, the fiber adhesive prepared from the composite fiber and the thermoplastic elastomer, the solid electrolyte matrix and the positive electrode material are subjected to ball milling and hot rolling treatment, so that the interface contact between the cathode and the electrolyte is optimized, the interface impedance is reduced, the cyclic stress is relieved, and the generation of interface cracks is inhibited; the prepared solid electrolyte membrane is high in ionic conductivity and stable in structure.

The invention discloses a composite sulfide electrolyte as well as a preparation method and application thereof. The composite sulfide electrolyte contains a three-dimensional cross-linked structure formed by connecting a sulfide electrolyte and a cross-linked polymer containing dynamic bonds through chemical bonds. The composite sulfide electrolyte provided by the invention contains a three-dimensional cross-linked structure formed by the sulfide electrolyte and the cross-linked polymer containing dynamic bonds through chemical bonds, and the polymer contains sulfur element, so that the polymer and the sulfide electrolyte are relatively stable; various chemical bonds form chemical cross-linking between the sulfide electrolyte and the cross-linked polymer containing the dynamic bonds, for example, disulfide bonds, amido bonds and the like are contained at the same time, strong binding force and a self-repairing function are achieved, and the problems of interface layering and cracking caused by internal mechanical stress of the sulfide electrolyte are expected to be solved at the same time. When the composite sulfide electrolyte is applied to the all-solid-state battery, the limiting current density and the cycling stability of the all-solid-state battery can be improved.

The invention provides a secondary battery and a manufacturing method thereof, a battery device, an energy storage device and a power utilization device, which are at least beneficial to improving the performance of the secondary battery. The manufacturing method comprises the steps that magnetic composite filler comprising an ionic conductor core is prepared, the surface of the ionic conductor core is sequentially coated with a magnetic functional layer and a protective layer, the magnetic functional layer is made of a magnetic material, and the protective layer is made of an oxide; preparing a polymerization precursor comprising the magnetic composite filler, a polymer matrix, an initiator, a lithium salt and a solvent; coating the polymeric precursor under a pulsed magnetic field to form a film, so that the magnetic composite filler is directionally arranged along the thickness direction of a film layer; initiating the polymerization precursor to generate polymerization reaction, so that the polymerization precursor is cured and molded into a solid electrolyte membrane; a positive plate and a negative plate are provided, the positive plate, the solid electrolyte membrane and the negative plate are subjected to winding treatment or lamination treatment and then put into the shell, and an initial battery cell is formed.

The invention relates to a preparation method of a low-cost and high-safety composite polymer solid electrolyte, and belongs to the technical field of sodium ion semi-solid / solid batteries. The traditional PVDF-based solid electrolyte has the problems of low room-temperature ionic conductivity, insufficient mechanical strength, high interface impedance and the like. The composite solid electrolyte with a three-dimensional interpenetrating network structure is constructed by uniformly dispersing nanocellulose in a PVDF (polyvinylidene fluoride) matrix and combining a solvent casting process. The mechanical strength and the thermal stability of the electrolyte are remarkably improved through the nanocellulose, the interfacial compatibility between the electrolyte and an electrode is effectively improved through the synergistic effect of the nanocellulose and the PVDF, the interface impedance is reduced, and meanwhile, the growth of sodium dendrites is effectively inhibited. The preparation process is simple, the raw materials are environment-friendly, and the obtained electrolyte has high ionic conductivity, excellent mechanical properties and interface stability, is suitable for all-solid-state sodium metal batteries with high energy density and high safety, and has wide application prospects in the fields of electric automobiles and energy storage.

The invention discloses a preparation method of a poly (1, 3-dioxolame)-based composite electrolyte, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: adding a sodium salt and a 1, 3-dioxolame monomer into a solvent, then mixing with an additive to obtain a precursor, and carrying out standing and polymerization curing treatment to obtain the poly (1, 3-dioxolame)-based composite electrolyte. According to the invention, the polymerization curing time of the precursor is greatly shortened by optimizing a solvent system; the additive is introduced into the precursor, the additive comprises a cross-linking agent and / or an inorganic filler, the cross-linking agent is trimethylolpropane triglycidyl ether, and the inorganic filler is NASICON type solid electrolyte powder, so that the ionic conductivity of the poly (1, 3-dioxolame)-based composite electrolyte is effectively improved, and the service life of the poly (1, 3-dioxolame)-based composite electrolyte is prolonged. And the cycling stability and the first-cycle discharge specific capacity of the assembled battery are remarkably improved.

The invention provides a preparation method and application of a composite gel electrolyte, and relates to the technical field of electrochemical energy storage, and the preparation method comprises two steps of preparation of MXene-SiO2 and preparation of the composite gel electrolyte. Etched MXene, CTAB (cetyltrimethyl ammonium bromide) and NaOH are mixed and stirred, then TEOS (tetraethyl orthosilicate) is added to react under a water bath condition, washing and freeze drying are performed to obtain a required target product MXene-SiO2, and the composite gel electrolyte comprises a polymer monomer, a cross-linking agent, an initiator, zinc salt and a proper amount of MXene-based additive. The problem of poor compatibility between the solid electrolyte and an electrode interface can be improved, so that the cycle performance of the zinc ion battery is improved. The composite gel electrolyte obtained by the invention has the characteristics of high thermal stability and the like, and has high ionic conductivity, wide electrochemical window and good mechanical durability.

The invention relates to a composite solid electrolyte membrane with high ionic conductivity as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a porous matrix membrane, composite solid electrolytes and a copolymer, wherein the surfaces and pores of the porous matrix membrane are filled with the composite solid electrolytes, and the copolymer forms a cross-linked network among the composite solid electrolytes; the porous matrix membrane comprises a matrix material, a plasticizer, a first lithium salt and a fluorocarbon surfactant; the composite solid electrolyte is of a core-shell structure, an inner core is a solid electrolyte, and an outer shell is a metal organic framework with pores adsorbing ionic liquid; the ionic liquid is synthesized from imidazole ionic liquid and second lithium salt; the copolymer is formed by initiating in-situ polymerization of an organic matter monomer and a cross-linking agent through an initiator. The composite solid-state electrolyte membrane and the solid-state battery are prepared through in-situ polymerization, and the composite solid-state electrolyte membrane with high ionic conductivity can improve the electrochemical window of the solid-state battery, reduce the surface resistance and improve the cycle performance.

The invention discloses an electrolyte preparation method and a battery. The preparation method of the electrolyte comprises the following steps: adding a polymer and industrial solid waste into a solvent to form a mixed solution; preparing the mixed solution into a framework material; mixing a monomer, a lithium salt and an initiator to form a polymerization solution; and preparing the polymer solution and the framework material into the electrolyte. The method can realize high-value utilization of industrial solid wastes.

The invention discloses a nano hard alloy composite solid electrolyte membrane as well as a preparation method and application thereof, and belongs to the technical field of solid lithium batteries. The nano hard alloy composite solid electrolyte membrane comprises the following raw materials: nano hard alloy modified inorganic solid electrolyte, a spinning polymer, an organic dispersing agent and lithium salt, the nano hard alloy modified inorganic solid electrolyte comprises the following raw materials: nano hard alloy, a fluxing agent, a metal binder and an inorganic solid electrolyte. The invention also discloses a preparation method and application of the nano hard alloy composite solid electrolyte membrane. The problems of poor mechanical property, poor thermal stability, low ionic conductivity and poor electrochemical stability of the polymer solid electrolyte can be solved, and the application prospect is wide.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

The embodiment of the invention provides an electrolyte and a preparation method thereof, a battery and a power utilization device. The electrolyte comprises a polymer electrolyte substrate, an inorganic additive and a functional additive, the functional additive can prevent the inorganic additive from physical agglomeration and chemical denaturation. In the embodiment of the invention, the functional additive is introduced into the composite polymer electrolyte of the polymer electrolyte substrate and the inorganic additive, and the functional additive can maintain the stability of the slurry, so that the physical agglomeration and chemical denaturation of the inorganic additive are prevented, and the problem of poor interface stability between the polymer and the inorganic additive is further improved.

The invention relates to an organic-inorganic composite solid electrolyte and a preparation method thereof, and the organic-inorganic composite solid electrolyte with higher room-temperature ionic conductivity and wider electrochemical window is prepared by compounding an oxide solid electrolyte, an unsaturated polymer crosslinked on the surface of the oxide solid electrolyte in situ and a polar organic solvent. The room-temperature ionic conductivity of the prepared composite solid electrolyte can reach 0.1 mS / cm or above, the electrochemical window is larger than 4.5 V, the alkali metal cation transference number is larger than 0.9, in addition, the composite solid electrolyte is easy to form a film, and the prepared composite solid electrolyte film is thin in thickness. The electrolyte membrane is used for assembling a solid-state alkali metal battery, has good interface stability with a positive electrode and a negative electrode, can inhibit the growth of alkali metal dendritic crystals, and remarkably improves the battery performance.

The invention discloses a composite solid electrolyte membrane, a preparation method thereof and a lithium ion solid-state battery, and belongs to the technical field of batteries. The composite solid electrolyte membrane comprises inorganic fibers, lithium salt and a polymer film-forming matrix. The inorganic fiber comprises a dielectric ceramic fiber and an inorganic ion conductive fiber which are formed by side-by-side electrostatic spinning. Under an external electric field, a built-in electric field can be generated between the dielectric ceramic fiber and the inorganic ion conductive fiber which are formed by side-by-side electrostatic spinning, a space charge layer between the organic polymer solid electrolyte and the inorganic ion conductive material in the composite solid electrolyte membrane can be weakened, and the lithium flux is optimized, so that dissociation of lithium ions is promoted; the composite solid electrolyte membrane can generate more lithium ions easy to move, so that the lithium ions in the lithium salt can spontaneously transfer to the inorganic ion conductive material in a cross-interface manner, thereby realizing high-efficiency transmission of the lithium ions and further improving the ionic conductivity of the composite solid electrolyte membrane.

The invention relates to the technical field of lithium batteries, in particular to a composite solid electrolyte membrane, a preparation method thereof and a lithium metal battery. The composite solid electrolyte membrane comprises a fiber porous matrix and a filling phase, the fiber porous matrix is of a three-dimensional porous structure formed by ordered arrangement and crosslinking of fiber matrixes, and pores of the fiber porous matrix are filled with the filling phase; a Hellman orientation factor fgt of the fibrous porous matrix; 0.5 part; the fiber matrix comprises a fiber material and a first functional additive, and the first functional additive is attached to the fiber material; the filling phase comprises a polymer material, a lithium salt and a plasticizer. According to the composite solid electrolyte membrane disclosed by the invention, the components and structures of the fiber porous matrix and the filling phase are optimized, so that the ordered fiber porous matrix and the filling phase can play a better synergistic effect; therefore, the composite solid electrolyte membrane has excellent performance in the aspects of high ionic conductivity, wide electrochemical window, long cycle life, high safety and the like.

The invention discloses a lithium-stable ultrathin flexible solid electrolyte film based on a high-dielectric oxide skeleton, and belongs to the technical field of solid electrolyte. The ultra-thin flexible solid electrolyte film comprises a framework, a dielectric layer and a flexible layer, wherein the framework is composed of a high-dielectric oxide; and the polymer electrolyte is formed by in-situ curing, covers the surface of the framework and is filled in the pores of the framework. Benefited from the high dielectric oxide skeleton, the ultrathin flexible solid electrolyte film has high stability to lithium, high ionic conductivity, high ionic transference number and long cycle life, and is very suitable for preparing a solid-state battery with high volume and / or high mass energy density.

The invention discloses a preparation method of a polyether block polyamide (PEBAX) fiber solid electrolyte membrane. The polyether block polyamide (PEBAX) fiber solid electrolyte membrane is formed by compounding polyether block polyamide fibers and solid electrolyte, the preparation method comprises the following steps: dispersing a solid electrolyte in a polyether block polyamide solution, preparing a polyether block polyamide-based solid electrolyte membrane by adopting an electrostatic spinning process, carrying out vacuum heat treatment, and rolling by a roller press to obtain the polyether block polyamide-based solid electrolyte membrane. The tensile strength, Young modulus, ionic conductivity and lithium ion transference number of the developed polyether block polyamide-based solid electrolyte membrane are improved, and the polyether block polyamide-based solid electrolyte membrane is expected to be applied to all-solid-state lithium ion batteries.