614 results about "Composite electrolyte" 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 belongs to the technical field of new energy, and discloses a preparation method and application of a LiaMXb-based composite solid electrolyte membrane, and the preparation method comprises the following steps: S1, carrying out spray drying on a mixed solution in which a Li source, an M source and an ammonium salt are dissolved, placing the mixed solution in a crucible of which the bottom is paved with the ammonium salt, and annealing for 2-10 hours at 350-800 DEG C in an inert atmosphere to obtain a LiaMXb solid electrolyte; s2, mixing the LiaMXb solid electrolyte with a fluorine-containing monomer A and a dispersing agent, and performing spray drying to obtain electrolyte powder wrapped by the fluorine-containing monomer A; s3, ball-milling and uniformly mixing the electrolyte powder wrapped by the fluorine-containing monomer A, a lithium salt, a thermal curing agent and a monomer B in an inert atmosphere to obtain composite electrolyte powder; and S4, carrying out cold isostatic pressing and hot pressing curing on the composite electrolyte powder to prepare the LiaMXb-based composite solid electrolyte membrane. The prepared LiaMXb-based composite solid electrolyte membrane not only has excellent air stability, flexibility and machinability, but also has a continuous three-dimensional ion conduction path, and the assembled all-solid-state lithium battery has good electrochemical performance.

The invention provides an aerogel reinforced composite electrolyte thin film for a solid-state lithium battery and a preparation method of the aerogel reinforced composite electrolyte thin film, and belongs to the technical field of composite electrolytes.The thin film comprises a three-dimensional porous aerogel skeleton, a solid-state electrolyte compound and lithium salt nanocrystals; wherein the three-dimensional porous aerogel skeleton is prepared from inorganic oxide nanoparticles and a polymer precursor through a sol-gel method; pores of the three-dimensional porous aerogel skeleton are filled with the solid electrolyte compound, the solid electrolyte compound comprises lithium lanthanum zirconium oxide nanowires and a polyoxyethylene-lithium salt composite matrix, and the lithium lanthanum zirconium oxide nanowires are directionally arranged in the thickness direction of the film; the lithium salt nanocrystals grow on the surface of the pore wall of the three-dimensional porous aerogel in situ; the mass ratio of the aerogel skeleton to the solid electrolyte compound is (1: 3)-(1: 15). According to the thin film, the ionic conductivity, the mechanical strength and the interface stability of the electrolyte are remarkably improved.

The invention discloses a composite solid electrolyte membrane, a solid lithium metal battery and a preparation method thereof, the composite solid electrolyte membrane comprises a fast ion conductor filler, a PVDF polymer matrix, a lithium salt and an amide additive, and the amide additive can perform weak coordination with lithium ions. According to the composite solid-state electrolyte membrane, the solid-state lithium metal battery and the preparation method of the solid-state lithium metal battery, disclosed by the invention, the room-temperature ionic conductivity of all-solid-state composite electrolyte can meet room-temperature operation of the battery, and the solid-state lithium metal battery is suitable for large-scale production and application.

The invention discloses a rechargeable magnesium battery composite electrolyte and a preparation method and application thereof, the electrolyte comprises an organic ether solvent, an electrolyte magnesium salt and an additive, and the additive is one or two of a sulfimide additive or a phosphate additive. By introducing the sulfimide additive into the organic ether solvent electrolyte containing the electrolyte magnesium salt, the kinetic performance of the electrolyte is remarkably improved under the mutual synergistic effect of all the components, the solvation structure of electrolyte magnesium ions is effectively regulated and controlled, the dissolution of the electrolyte magnesium salt is accelerated, the conductivity of the magnesium ions is improved, and the service life of the electrolyte is prolonged. Reversible electrochemical circulation of the magnesium symmetric battery under high current density is realized, the cycle life of the battery is prolonged, a phosphate ester additive is continuously introduced, a phosphorus-rich magnesium ion conductive interface film is formed on the surface of magnesium metal, the transmission capacity of Mg < 2 + > is enhanced, the overpotential and potential barrier of magnesium negative electrode dissolution / deposition are reduced, and the performance of the battery is improved. Therefore, the electrochemical reversibility and coulombic efficiency of the asymmetric battery are improved.

The invention discloses a preparation method and application of a composite sulfur positive electrode packaged by a sulfide-halide composite electrolyte spherical shell. The composite sulfur positive electrode packaged by the sulfide-halide composite electrolyte spherical shell provided by the invention has a core-shell structure, the inner core is a sulfur-carbon composite material, and the outer layer is a sulfide-halide composite electrolyte shell; the sulfur volume change effect in the charging and discharging process can be effectively relieved, uniform stress distribution and effective contact in the composite positive electrode are ensured, and the utilization rate of positive electrode active substances and the overall energy density of the battery are improved. Meanwhile, the composite sulfur positive electrode provided by the invention has high ionic conductivity at room temperature, can significantly improve the reaction kinetics of the positive electrode and improve the capacity and rate capability of the battery, can be used for assembling and preparing a solid-state lithium-sulfur battery, has good safety performance and high energy density, and has a wide application prospect.

The invention discloses a high-modulus leather / eutectic gel composite electrolyte and a preparation method and application thereof, and belongs to the technical field of energy storage. The preparation method comprises the following steps: 1) preparing a eutectic gel solution containing polyvinyl alcohol, zinc salt, small molecular polyol and water; 2) carrying out vacuum impregnation to obtain leather fibers containing a eutectic gel solution; and (3) obtaining the leather / eutectic gel composite electrolyte with the imitated reinforcing steel bar-concrete structure through freeze-thaw circulation.The composite electrolyte effectively solves the problem that an existing gel electrolyte is low in modulus and difficult to effectively deal with extreme mechanical deformation, and the cycle life of the water-based zinc ion battery is remarkably prolonged.

The invention discloses a gel electrolyte precursor, a gel composite electrolyte, a lithium ion battery and electric equipment. The gel electrolyte precursor comprises a polymer monomer, an inorganic nano-material, an initiator and a lithium salt solution, the lithium salt solution comprises a lithium salt and a solvent, and based on the total mass of the gel electrolyte precursor, the content of the inorganic nano-material is 1%-15%. According to the gel electrolyte precursor provided by the invention, the use amount of an electrolyte is reduced, the mechanical property of the electrolyte is improved, and the safety and cycling stability of a battery are enhanced.

The invention discloses a preparation method of a solid-state battery unit and a solid-state battery containing a composite multifunctional electrolyte layer, multifunctional integration of a single-layer electrolyte is realized through a composite material system, and compared with a traditional PE / PP diaphragm system, the proportion of an inorganic material in the composite electrolyte layer is greater than 90%, and the composite electrolyte layer has excellent high-temperature resistance and can be used for preparing a solid-state battery. And the structural integrity is kept when the battery is possibly subjected to thermal runaway. The localized adding mode of the ionic liquid and the conductive salt is optimized, and high-temperature degradation is avoided; the manufacturing process is simplified, tight interface contact between the electrolyte layer and the electrode is ensured, and impedance is reduced. Compared with a traditional liquid lithium ion battery, the solid-state battery prepared by the invention has the liquid content of less than 1%, and has high safety and cycle performance. The problems that an electrolyte layer in a traditional solid-state battery is single in function (for example, only ion conduction is concerned), the interface impedance is large, the thermal stability is poor, and the mechanical strength is insufficient are mainly solved, and the comprehensive performance and safety of the battery are improved.

The invention relates to the technical field of battery solid electrolyte, in particular to a method for constructing polyethylene oxide-based composite solid electrolyte by sub-nanowires. According to the specific technical scheme, the method comprises the following steps: (1) sub-nanowire surface grafting modification: dispersing sub-nanowires in a weak polar solvent, then adding a sulfhydryl compound and a photoinitiator, and reacting for 4-10 hours under the conditions of ultraviolet irradiation and ice bath; and (2) construction of the composite solid electrolyte: dissolving polyethylene oxide, a lithium salt and the sub-nanowire modified in the step (1) in a polar solvent, uniformly stirring, casting to form a film, and drying at normal temperature. According to the invention, the problems of poor filler dispersity, low size matching degree, insufficient interfacial compatibility and the like in the traditional composite electrolyte are solved.

Provided herein are compositions of solid-state ionically conductive composite materials that include particles of an inorganic phase in a matrix of an organic phase having a positive thermal coefficient of expansion. When the temperature of the composition is below a cutoff temperature Tc, the composition is ionically conductive and may be used as an electrolyte. As the temperature increases above Tc, the organic phase expands and reduces the ionic conductivity of the composition.

The invention provides a copper-nickel alloy foil and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode current collectors, and the preparation method comprises the following steps: preparing a copper-nickel composite electrolyte, and adding a coordination agent, a pH buffer agent and an additive into the copper-nickel composite electrolyte to obtain a mixed electrolyte; the coordination agent comprises a main coordination agent and an auxiliary coordination agent, and the main coordination agent comprises at least one of trisodium citrate, potassium sodium tartrate and sodium pyrophosphate; the auxiliary coordination agent comprises at least one of ammonia water, glycine and triethanolamine; and a cathode and an anode are placed in the mixed electrolyte, the pH of the mixed electrolyte is controlled to be 6-10, direct current is applied for electrochemical deposition, and the copper-nickel alloy foil is obtained. According to the method, the alkalescence system is adopted, the main coordination agent and the auxiliary coordination agent are used, full coordination of free Cu < 2 + > and Ni < 2 + > is achieved, precipitation is avoided, the hydrogen evolution phenomenon is greatly reduced, and the alloy foil quality is improved.

The invention relates to a surface-coated oxide solid electrolyte and a preparation method thereof, the surface-coated oxide solid electrolyte comprises an oxide electrolyte and a surface coating layer, the chemical formula of the oxide solid electrolyte is Li7-xLa3Zr2MxO12-x (M = Ta, Nb, Hf, Ge, Sc, Ti, Al, Si, Sn, Y, 0 < = x < = 1), the chemical formula of the surface coating layer is LiXON (R = Ta, Nb, Al, Zr, Ga, In, N = F, Cl, Br, I), and a lithium source, a lanthanum source, a zirconium source, an M source, an X source and an N source, or an XN source are connected in series, garnet solid electrolyte powder with a stable surface coating layer is obtained by adopting a solid phase method or a sol-gel method and combining a low-temperature calcination process; and then mixing and reacting with a lithium salt and a polymer electrolyte, and pouring the obtained slurry on a polyfluortetraethylene plate to prepare the composite electrolyte. Compared with the prior art, the high-ion conductor layer formed on the surface of the product in situ constructs a rapid transmission channel for lithium ion transmission in the composite electrolyte, and high ion conductivity is achieved.

The purpose of the present invention is to provide a composite electrolyte membrane which has excellent chemical resistance and can maintain sufficient mechanical strength even under conditions of high humidity and high pressure, which are the operating conditions for electrochemical hydrogen pumps and water electrolyzers. This composite electrolyte membrane, which is for achieving said purpose, has a composite layer obtained by combining a polyelectrolyte with a mesh woven material that satisfies (1) and (2) and comprises liquid crystal polyester fibers or polyphenylene sulfide fibers. (1): Mesh thickness (μm) / fiber diameter (μm)<2.0. (2): Opening (μm) / fiber diameter (μm)>1.0.

The invention relates to the technical field of lithium batteries, in particular to a lithium-loving PCOF-PMIA composite nanofiber membrane and a preparation method and application thereof.According to the preparation method, the lithium-loving PCOF-PMIA composite nanofiber membrane is obtained by means of an electrostatic spinning technology and a room-temperature in-situ growth technology, and the mechanical strength of the fiber membrane is greatly improved; the COF nanoparticles are prepared by a room-temperature stirring synthesis process, and the method has the advantages of mild reaction conditions, simplicity in operation, short time consumption and the like; the lithium-loving PCOF-PMIA composite nanofiber membrane has a uniform net-shaped nanofiber structure, and COF particles on the surface and in the fiber can be effectively connected at the same time, so that the maximum utilization of the COF can be achieved. The PMIA and the PCOF are simultaneously introduced into the composite nanofiber membrane provided by the invention, so that the ionic conductivity and the lithium ion transference number of the solid electrolyte are favorably improved, and the composite nanofiber membrane is expected to be applied to preparation of the solid composite electrolyte.

The invention belongs to the technical field of magnesium-zinc magnesium alloy surface treatment, and particularly relates to a method for in-situ growth of different blue ceramic film layers on the surface of a magnesium-zinc magnesium alloy. Comprising the following steps that the surface of a magnesium-zinc magnesium alloy sample is polished and cleaned, and then the surface of the sample is sequentially subjected to primary alkali washing, primary water washing, primary acid pickling, secondary water washing, secondary acid pickling, tertiary water washing and secondary alkali washing, so that the pretreated magnesium alloy is obtained; the pretreated magnesium alloy is placed in electrolyte for micro-arc oxidation treatment, and a blue ceramic film layer is generated on the surface of the magnesium alloy in situ; the electrolyte is formed by adding potassium fluotitanate and cobaltous sulfate into a silicate and phosphate composite electrolyte system; or the electrolyte is obtained by adding potassium fluotitanate into a phosphate electrolyte system. Different blue ceramic film layers are prepared, the ornamental value of the magnesium-zinc magnesium alloy component can be improved, and the visual effect is 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 belongs to the technical field of battery diaphragm materials, and particularly relates to a composite diaphragm, a preparation method, a battery and application of the battery. The composite diaphragm comprises a base membrane and a first coating coated on one surface of the base membrane, the porosity of the composite diaphragm is 45%-87%; the raw material of the first coating comprises a first active material, and the first active material comprises a composite electrolyte material; the composite electrolyte material comprises the following raw materials: a solid electrolyte, an organic ligand and a lithium supplement agent. The composite diaphragm has good liquid absorption rate and thermal stability, and can meet the requirements of rapid charging and discharging of the battery.

The invention provides a multifunctional carbon fiber lithium battery based on a sulfide composite electrolyte membrane and a preparation method and application of the multifunctional carbon fiber lithium battery, and belongs to the technical field of lithium batteries and functional composite materials. According to the invention, a nitrogen phosphide interface layer is constructed on the surface of a sulfide electrolyte membrane or a nitrogen phosphide derivative is dispersed in a bulk phase, so that the stability of an electrolyte and a metal lithium interface is effectively improved, and lithium dendrites are inhibited; and by combining the multifunctional characteristics of the carbon fiber and glass fiber woven cloth, high specific energy and light weight can be realized, the overall safety and mechanical strength are enhanced, and the composite material is suitable for various high-performance energy storage occasions.

The invention discloses a preparation method of a solid-state polymer composite electrolyte material and application of the solid-state polymer composite electrolyte material in an all-solid-state battery, and relates to the technical field of all-solid-state lithium ion batteries, and the preparation method comprises the following steps: firstly synthesizing a skeleton filler, adding an acid solution, and then carrying out ultrasonic treatment, soaking, centrifuging and washing to obtain an acid-modified skeleton filler; dispersing the acid-modified skeleton filler in an organic solution, adding a lithium salt, stirring, centrifuging, and washing to obtain a lithiated skeleton filler; weighing an electrolyte salt, adding the electrolyte salt into the polymer precursor, adding the lithiated skeleton filler, uniformly mixing, and drying to obtain a dried product; and finally, rolling the dried product into a thin film to obtain the solid polymer composite electrolyte thin film. According to the preparation method of the solid polymer composite electrolyte material, the ionic conductivity and Li < + > transference number of a solid polymer composite electrolyte thin film prepared by inducing polymer precursor polymerization through cations and compounding the inorganic filler at normal temperature are superior to those of a commercial PP film and a poly N, N-dimethylacrylamide film.

A lithium battery comprising an anode, a cathode, a solid-state electrolyte, an interface enhancer composition in ionic communication with the anode and the cathode, wherein (a) the electrolyte comprises a solid polymer, a polymer gel, an inorganic solid-state, or a polymer / inorganic composite electrolyte; (b) the interface enhancer composition comprises a lithium salt, a liquid solution comprising an organic solvent or ionic liquid and a lithium salt dissolved therein, a polymer containing a lithium salt dissolved or dispersed therein, or a combination thereof; (c) the cathode comprises a cathode active layer comprising particles of a cathode active material, a conductive additive, an optional binder, and pores occupying 1% to 40% by volume of the cathode active layer and the interface enhancer resides in 30% to 100% of the pores; and (d) the interface enhancer is present between the solid-state electrolyte and the cathode and between the solid-state electrolyte and the anode.

The invention relates to the technical field of sodium ion batteries, and discloses a low-overpotential uniform sodium deposition composite electrolyte and a preparation method of a sodium metal battery, the composite electrolyte comprises a sodium salt, a solvent, a film-forming additive and a sodium deposition regulating agent; the film forming additive is selected from at least one of NaPO2F2, NaDFOB and Na2SO3; the sodium deposition regulating agent is selected from at least one of CsTFSI, SnCl2 and Bi (OTf) 3. Through the synergistic effect of the film-forming additive and the sodium deposition regulating agent, a stable and firm SEI film can be formed on the interface of the negative electrode current collector, the overpotential of sodium deposition is obviously reduced to 20 mV or below, the growth of sodium dendrites is effectively inhibited, and dense and uniform deposition of sodium is realized. The negative-electrode-free sodium metal battery based on the composite electrolyte shows high first efficiency (greater than or equal to 90%), high coulombic efficiency (greater than 99.5%) and excellent cycling stability, and an effective scheme is provided for solving the core challenge of a sodium metal negative electrode.

The invention discloses a wide-temperature-range high-rate semi-solid lithium iron phosphate battery and a preparation method thereof, and belongs to the technical field of batteries, the wide-temperature-range high-rate semi-solid lithium iron phosphate battery comprises a positive electrode material, a negative electrode material, a diaphragm and an electrolyte; the positive electrode material comprises a positive electrode active material, a first conductive agent, a positive electrode binder and a graphene-coated aluminum foil current collector; the negative electrode material comprises a negative electrode active substance, a second conductive agent, a negative electrode binder and a graphene-coated aluminum foil current collector; the diaphragm is a single-side-coated ceramic diaphragm; the electrolyte comprises an organic solvent, a composite electrolyte and a composite additive. The positive electrode material adopts an active substance composed of lithium-aluminum-titanium-phosphorus and lithium iron phosphate, the active substance and the lithium iron phosphate have a synergistic effect, and are matched with the first conductive agent conductive carbon black, the positive electrode binder and the graphene-coated aluminum foil current collector, so that the stability of a positive electrode interface can be enhanced, and the lithium-aluminum-titanium-phosphorus lithium-iron-phosphate battery can be effectively improved at different temperatures. Especially at high temperature, the electrolyte solvent can be inhibited from oxygenolysis on the surface of the positive electrode, and generation of corrosive gas and loss of active substances are reduced.

The invention discloses a preparation method and application of a composite solid electrolyte containing a bifunctional multi-walled carbon nanotube, and the preparation method comprises the following steps: reacting a multi-walled carbon nanotube with nitric acid to obtain a multi-walled carbon nanotube rich in oxygen-containing functional groups; adsorbing a polar functional group by using the carbon nanotube to obtain a bifunctional multi-wall carbon nanotube; and mixing the bifunctional multi-walled carbon nanotubes with an electrolyte dispersion liquid, drying the mixture to obtain a composite electrolyte dispersion liquid, and drying the composite electrolyte dispersion liquid to obtain the composite solid electrolyte. The bifunctional multi-walled carbon nanotube can accelerate ion migration in the tube, so that a stable electrode / electrolyte interface layer is constructed, oxygen-containing functional groups and polar groups promote release of more free lithium ions, and the migration rate of the lithium ions in the electrolyte is improved. The contact interface between the solid electrolyte and the electrode can be effectively improved, and the ion transmission efficiency between the electrolyte and the electrode can be improved, so that the cycle performance is improved.

The invention discloses a method for preparing an hBN ceramic coating on the surface of a SiCp / 2024Al substrate, and belongs to the technical field of surface treatment. The invention discloses a method for preparing an hBN ceramic coating on the surface of a SiCp / 2024Al substrate. The method comprises the steps that the SiCp / 2024Al substrate is polished and ground and then dried after being subjected to ultrasonic cleaning; adding sodium silicate, sodium hydroxide, the hexagonal boron nitride nano-powder and a surface active component into deionized water, and performing ultrasonic dispersion to obtain a composite electrolyte; placing the composite electrolyte in a stainless steel electrolytic bath, and connecting the stainless steel electrolytic bath to a power supply cathode of a plasma discharge system; the pretreated SiCp / 2024Al substrate is connected to the positive electrode of a power source of a plasma discharge system and immersed in the composite electrolyte; and the plasma discharge system operates, under the action of positive and negative pulses, the nano-particles are driven to migrate to the surface of the SiCp / 2024Al substrate and participate in reaction co-deposition, and the compact and uniform large-thickness high-electrical-insulation hBN ceramic coating grows on the surface of the substrate.

The invention discloses an epoxy resin-based amorphous polymer electrolyte and a preparation method of a composite polymer electrolyte. The electrolyte is composed of an epoxy resin-based amorphous polymer electrolyte, a metal organic framework and inorganic solid electrolyte powder. In the preparation process of the composite electrolyte, a metal organic framework material is introduced, and lithium salt anions are anchored through unsaturated metal coordination sites, so that the lithium ion transference number of the composite electrolyte is increased. In addition, the introduced inorganic solid electrolyte powder further improves the ionic conductivity of the composite electrolyte, so that the composite electrolyte can meet the charge-discharge cycle requirements of the lithium iron phosphate battery at room temperature and a certain rate. The preparation method of the polymer electrolyte is simple, raw materials are easy to obtain, and the polymer electrolyte has industrial production and application prospects and has a heuristic effect on development of polymer-based solid-state batteries.

The invention discloses a lithium aluminum titanium phosphate composite polymer as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method of the titanium-aluminum-lithium phosphate composite polymer comprises the following steps: dissolving a polymer monomer and a lithium salt in an organic solvent in an inert atmosphere, then adding silane coupling agent modified titanium-aluminum-lithium phosphate, reacting, and then adding a cross-linking agent to carry out cross-linking polymerization on the polymer monomer and the silane coupling agent modified titanium-aluminum-lithium phosphate to obtain the titanium-aluminum-lithium phosphate composite polymer. And curing to obtain the lithium titanium aluminum phosphate composite polymer. Reaction sites dispersed in a polymer chain react with surface groups of the silane coupling agent modified LATP, so that the modified LATP particles are uniformly dispersed along the polymer chain. The LATP and the polymer are connected through a chemical bond, so that discontinuous conduction of lithium ions caused by an organic-inorganic interface of a traditional composite electrolyte is improved. The introduction of LATP makes the electrolyte have good mechanical properties and thermal stability.

The invention discloses a sulfide composite electrolyte as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries, an organic coating agent and an organic solvent are mixed, oxide nanoparticles are dispersed in the mixture, a precipitate is extracted and dried to obtain an oxide-organic coating agent composite material, then the oxide-organic coating agent composite material is subjected to ball milling treatment in the sulfide electrolyte, and the sulfide composite electrolyte is obtained. The sulfide composite electrolyte solves the problems of lithium dendrites and self discharge existing in a sulfide all-solid-state battery, the prepared sulfide composite electrolyte can smoothly transmit lithium ions, meanwhile, electron transfer between sulfide electrolyte interfaces is blocked, the electron conductivity is reduced, and the service life of the sulfide all-solid-state battery is prolonged. The growth of lithium dendrites along gaps of sulfide electrolyte is favorably inhibited, and the problem of lithium dendrites in a solid-state battery can be reduced. The preparation method provided by the invention is simple in process, low in equipment requirement and easy to amplify.

The invention relates to the field of batteries, in particular to a negative plate, a preparation method thereof and a battery. The negative plate comprises a current collector, a first coating, a second coating and a third coating, wherein the first coating comprises a graphite material coated with a carbon material; the second coating comprises a tin-based material coated with a conjugated polymer; and the third coating comprises a composite electrolyte, and the composite electrolyte comprises an oxide solid electrolyte and a polymer electrolyte. The preparation method of the negative plate comprises the following steps: coating a current collector with first slurry to form a first coating; coating the first coating with second slurry to form a second coating; and spraying the third slurry on the second coating to form a third coating so as to obtain the negative plate. The negative plate provided by the invention can improve the energy density performance, long cycle life performance and rapid charging performance of the battery, realizes consideration of high gram volume and dynamic performance, and also has relatively good safety performance.

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.