522results about "Composite electrolytes" patented technology

Embodiments described herein relate generally to electrochemical cells including a selectively permeable membrane and systems and methods for manufacturing the same. In some embodiments, the selectively permeable membrane can include a solid-state electrolyte material. In some embodiments, electrochemical cells can include a cathode disposed on a cathode current collector, an anode disposed on an anode current collector, and the selectively permeable membrane disposed therebetween. In some embodiments, the cathode and / or anode can include a slurry of an active material and a conductive material in a liquid electrolyte. In some embodiments, a catholyte can be different from an anolyte. In some embodiments, the catholyte can be optimized to improve the redox electrochemistry of the cathode and the anolyte can be optimized to improve the redox electrochemistry of the anode. In some embodiments, the selectively permeable membrane can be configured to isolate the catholyte from the anolyte.

A advanced fuel cell (AFC) assembly comprises a variety of features improving its performance, reliability, durability, and manufacturability include an ion exchange membrane such as a proton exchange membrane comprising polymers of perfluorinated sulfonic acid or hydrocarbon compounds supported by an inert endoskeletal structure of greater mechanical strength preventing deformation damage from handling, temperature cycling, and ionomer swelling and contraction from humidity cycling. The endoskeleton may be attached to wider exoskeletal pillars used for singulating one membrane from another after fabrication and to a thicker handle used to transport the membrane during processing prior to separation. Other AFC features include a asymmetric catalyst coated membrane inhibiting fuel cross over, oxygen back streaming, and CO atmospheric poisoning; a graded heterogenous gas diffusion layer for enhanced charge and gas transport; and a self-aligned gasket-less assembly with integrated sealant preventing gas leakage.

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 relates to the field of new energy batteries, in particular to an oxyhalide solid electrolyte composite material, a preparation method thereof and a battery, the oxyhalide solid electrolyte composite material comprises a core particle and a coating layer coating the surface of the core particle; wherein the inner core particle comprises LiaMObXc, the coating layer material comprises LiaMObXc-dFd, a is greater than or equal to 0.1 and less than or equal to 5w, and d is greater than or equal to 0.1 and less than or equal to 0.5 w; b < = 2, 2 < = c < = 6, 0lt; d < = 2; m is selected from at least one of Hf, Zr, Nb, Ta and Ti, and X is selected from at least one of Cl, Br and I. The oxyhalide solid electrolyte composite material disclosed by the invention is relatively low in fluorine content in a main body, so that the negative influence of over-low conductivity caused by high overall fluorine content of the material is reduced, and the electrolyte material is promoted to have excellent electrochemical oxidation potential and air stability while maintaining high ionic conductivity.

The invention relates to the technical field of lithium ion batteries, in particular to a high-safety nickel cobalt lithium manganate semi-solid battery and a preparation method thereof, and the high-safety nickel cobalt lithium manganate semi-solid battery comprises a positive electrode, a negative electrode, a double-gradient functional layer composite diaphragm and a high-safety electrolyte; the positive electrode comprises a positive electrode current collector and a modified nickel cobalt lithium manganate positive electrode material on the surface of the positive electrode current collector, the modified nickel cobalt lithium manganate positive electrode material comprises a modified nickel cobalt lithium manganate active material, a positive electrode conductive agent, a positive electrode binder and an inorganic solid electrolyte, and the modified nickel cobalt lithium manganate active material comprises a core body and a shell layer; the core body is a Ti and F gradient doped NCM core body, and the shell layer is of a Li2TiO3 / LiAlXB1-xO2 composite double-layer coating structure; the double-gradient functional layer composite diaphragm is of a sandwich double-gradient structure and comprises a base layer located in the middle, and a negative electrode side gradient layer and a positive electrode side gradient layer which are attached to the two side faces of the base layer respectively. The semi-solid battery has the advantages of high energy density, long cycle stability and high safety.

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 invention relates to a vertical orientation ceramic fiber / polymer composite solid electrolyte membrane and a preparation method and application thereof, the vertical orientation ceramic fiber / polymer composite solid electrolyte membrane is composed of an inorganic framework material with a vertical orientation structure and a toughening matrix material filled in the inorganic framework material, the inorganic framework material is an inorganic ceramic nanofiber with high lithium ion conductivity, the toughening matrix material is a polymer / lithium salt compound with relatively high lithium ion conductivity. The composite solid electrolyte membrane combines high modulus of an inorganic skeleton and high toughness of a polymer, has excellent mechanical properties, and can form good contact with a positive electrode and a negative electrode of a battery. More importantly, the unique vertical orientation fiber structure of the inorganic skeleton can greatly reduce the actual transmission path of ions in the operation process of the battery, and the ionic conductivity of the composite solid electrolyte membrane is greatly 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 relates to a preparation method of a composite solid electrolyte membrane and the composite solid electrolyte membrane, and the preparation method comprises the following steps: uniformly mixing a sulfide electrolyte and a halide electrolyte with a polymer monomer and an initiator respectively to obtain a sulfur-containing mixture and a halogen-containing mixture respectively; spraying a sulfur-containing mixture on the substrate, and spraying a halogen-containing mixture on the sulfur-containing mixture to obtain an electrolyte membrane precursor; carrying out light treatment on the electrolyte membrane precursor to obtain an electrolyte membrane prepolymer; carrying out heating treatment on the electrolyte membrane prepolymer to obtain an electrolyte membrane full polymer; and removing the substrate in the electrolyte membrane full polymer to obtain the composite solid electrolyte membrane. In the embodiment of the invention, the sulfide electrolyte and the halide electrolyte are combined together through in-situ polymerization of the polymer monomer under illumination, and the preparation method which is simple in process and can be used for batch production is provided. According to the preparation method, the mechanical strength, compactness and ion transmission capability of the composite solid electrolyte membrane can be improved.

The invention relates to an MXene-composite solid electrolyte, a preparation method and application thereof in the technical field of lithium batteries, and the method comprises the following steps: S1, preparing an MXene-polymer electrolyte; S2, mixing the MXene-polymer electrolyte prepared in the S1 with a nano solid electrolyte and a fibrosis binder, and performing fibrosis to obtain mixed powder; and S3, heating and calendering the mixed powder prepared in the step S2 to obtain the MXene composite solid electrolyte membrane. The preparation method comprises the following steps: forming an organic polymer electrolyte layer, namely MXene at polymer electrolyte, on the surface of MXene, and compounding nanocrystallized inorganic solid electrolyte powder, a binder and the MXene at polymer electrolyte into a film by using a dry preparation method. The problems that the nanocrystallized solid electrolyte powder is easy to agglomerate in the slurry and the internal distribution of the organic-inorganic composite electrolyte membrane in the electrolyte membrane is non-uniform are solved, and the introduction of the MXene material increases the conductivity of the electrolyte membrane, and the electrolyte membrane has high conductivity.

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 belongs to the field of waste residue oil hydrogenation catalyst recovery, and particularly relates to a method for preparing vanadyl sulfate electrolyte by using a waste residue oil hydrogenation catalyst. According to the method, the waste residue oil hydrogenation catalyst is used as a raw material, the high-purity vanadyl sulfate solution is prepared through the preparation procedures of roasting, leaching, impurity removal, reduction, extraction and reverse extraction, on one hand, the problem of solid waste treatment is solved, on the other hand, vanadium is selectively recycled from the high-concentration vanadium-containing solution through a solvent extraction method, and the production cost is greatly reduced. And the obtained vanadyl sulfate solution is high in purity, few in impurities and high in production efficiency.

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 discloses a preparation method of a high-viscosity polyvinylpyrrolidone-based gel electrolyte and application of the high-viscosity polyvinylpyrrolidone-based gel electrolyte in an aqueous zinc-iodine battery, and belongs to the technical field of batteries. Comprising the following steps: mixing vinyl pyrrolidone with a monomer, adding a solvent, fully stirring, and then adding a cross-linking agent and an initiator for copolymerization to obtain a polyvinylpyrrolidone-based copolymer; mixing the polyvinylpyrrolidone-based copolymer with biomass saccharides, pouring the mixture into a mold, and performing heating treatment to obtain a composite film; and soaking the composite membrane in a zinc salt solution to obtain the high-viscosity polyvinylpyrrolidone-based gel electrolyte. According to the preparation method, the high-viscosity polyvinylpyrrolidone-based gel electrolyte can be prepared, and the electrolyte has the advantages of being high in binding power and mechanical strength, environmentally friendly, low in cost and the like. The high-viscosity polyvinylpyrrolidone-based gel electrolyte can be used for preparing an aqueous zinc-iodine battery.

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 discloses a polyion liquid-based solid electrolyte, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method provided by the invention comprises the following steps: dispersing LLZTO nanoparticles into a polyacrylonitrile solution to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a composite fiber membrane; the preparation method comprises the following steps: mixing poly (diallyldimethylammonium) bis (fluorosulfonyl) imide, lithium bis (fluorosulfonyl) imide and 1-methyl-1-propyl pyrrolidinium bis (fluorosulfonyl) imide in a solvent to obtain a polyion liquid electrolyte solution; and immersing the composite fiber membrane into the polyion liquid electrolyte solution, taking out, standing and drying to obtain the composite fiber membrane. The solid electrolyte prepared by the invention has relatively high ionic conductivity and mechanical strength, and good flexibility and flame retardance, and a battery prepared from the solid electrolyte can circulate for more than 200 circles under high-rate current density.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion solid electrolyte system, a battery and a preparation method thereof.The solid electrolyte system comprises a solid electrolyte membrane and a gel electrolyte formed by curing a gel electrolyte precursor solution, and the solid electrolyte membrane is prepared from a polymer matrix and an inorganic solid electrolyte, sodium salt, a plasticizer and a first solvent; the inorganic solid electrolyte comprises an oxide electrolyte; the gel electrolyte precursor solution is prepared from the following raw materials: a monomer, sodium salt, an auxiliary agent, an initiator and a second solvent; the auxiliary agent is prepared from one or more than two of ethoxypentafluorocyclotriphosphazene, hexafluorocyclotriphosphazene, pentafluorophenoxy cyclotriphosphazene, triethyl phosphate and trimethyl phosphate. The solid electrolyte membrane disclosed by the invention has relatively high ionic conductivity and dendritic crystal resistance, and the gel electrolyte can improve the interface problem of the sodium-ion solid-state battery and reduce the liquid injection amount of the battery, so that the safety performance of the sodium-ion solid-state battery is improved.

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.