298 results about "Electrochemical window" patented technology

The invention discloses a difunctional filler synergistically enhanced polymer solid electrolyte and a solid-state battery, and belongs to the field of solid-state batteries. The electrolyte adopts a polymer matrix, a lithium salt and two functional fillers: the first filler has a high dielectric constant, and can accelerate dissociation of the lithium salt, fix negative ions of the lithium salt and improve the transference number of lithium ions under the action of self polarization; and the second filler has high electrochemical window and ionic conductivity, can inhibit high-voltage decomposition, and is adaptive to a high-voltage positive electrode material. Through cooperation and balance design of the two kinds of filler, ion transmission, interface stability and high-pressure compatibility can be considered at the same time. In addition, the invention further designs a composite negative pole piece, the surface of the negative pole piece is coated with the solid electrolyte, and the ion transmission kinetics in the pole piece can be remarkably improved. On the basis, the invention develops a high-performance solid-state battery which is excellent in electrochemical performance and can play an important role in the fields of consumer electronics, electric automobiles, energy storage systems, low-altitude flight and the like.

The invention relates to the technical field of solid-state batteries, in particular to oxyhalide solid-state electrolyte as well as a preparation method and application thereof. The method comprises the following steps: taking molten salt LiaMbXc as a raw material, reacting with an oxide AdOf in a molten state, removing steam impurities by utilizing a high-temperature vacuumizing mode, and cooling to prepare the oxyhalide solid electrolyte; according to the invention, the molten salt raw material is molten at high temperature to form the ion melt, and the oxygen element is introduced to replace part of halogen, so that the hardness of the target electrolyte is reduced after cooling, the deformability at room temperature is improved, and the obtained electrolyte is high in conductivity and wide in antioxidant electrochemical window. The prepared oxyhalide solid electrolyte is used for preparing a positive electrode, the adhesion force between the electrolyte and positive electrode material particles, the actual microscopic contact area and the ion migration rate are improved through melt permeation, the problem of a positive electrode interface is effectively relieved, and the electrochemical performance of an all-solid-state battery is improved.

The invention discloses a sulfide-based composite solid-state electrolyte, a preparation method thereof and a lithium metal solid-state battery, sulfide is subjected to specific bifunctional surface grafting modification by using a silane coupling reagent with sulfydryl and epoxy bonds, then the sulfide is introduced into a polymer precursor liquid, and the sulfide-based composite solid-state electrolyte is prepared through light-heat curing reaction synergy. A flexible and rigid cross-linked network is formed, the sulfide-based composite solid-state electrolyte with high ionic conductivity and high mechanical strength is obtained, the interface stability of the sulfide-based composite solid-state electrolyte in the charge-discharge process is ensured, for example, the sulfide-based composite solid-state electrolyte in the embodiment 1 has high ionic conductivity (3.81 mS / cm), and the interface stability of the sulfide-based composite solid-state electrolyte in the embodiment 2 is ensured. The lithium-lithium symmetric battery prepared by the method has the advantages of excellent flexibility, high tensile strength (7.9 Mpa) and wide electrochemical window (5.1 V), the lithium-lithium symmetric battery can stably circulate for 2000h, and the whole battery can stably circulate for 2000 circles at the room temperature at the rate of 4C, so that the lithium-lithium symmetric battery has great industrial application value.

The invention discloses a solid electrolyte with high ionic conductivity, which comprises the following components: a matrix material: a halide super ion conductor with a LiMXCl4 structure, M being selected from at least one of Ta, Nb and Hf, X being O or F, a chemical general formula being LiM1-aX1-6Cl4, a being equal to 0.1-0.3, and an electrochemical window being regulated to 2.5-4.0 V through fluorine-chlorine mixed anion substitution; the second phase material is a core-shell structure compound, the core is Li3TiCl6, and the shell is a Li3PS4 interface layer; and the sintering aid is a compound of Li3BO3 and LiF. Through fluorine-chlorine mixed anion regulation and control and MO2Cl4 octahedron synergistic tilting mechanism, the ionic conductivity of the solid electrolyte is remarkably improved, the lithium ion conductivity at room temperature is greater than or equal to 10mS / cm, the activation energy is less than or equal to 0.2 eV and is superior to that of the traditional halide electrolyte, and meanwhile, the free volume between chains is optimized through Zr < 4 + > / Sn < 2 + > gradient doping, so that the performance of the solid electrolyte is improved. The core-shell structure compound and the silane coupling agent are combined for modification, so that the electrochemical window is effectively widened to 2.5-4.0 V, the interface side reaction is inhibited, and the composite material is adaptive to a high-voltage positive electrode material.

The invention discloses a solid electrolyte, a preparation method thereof and an all-solid-state battery, and belongs to the technical field of solid electrolytes. According to the preparation method, a nano inert oxide and a solid electrolyte raw material are compounded through mechanical grinding, and the solid electrolyte with a core-shell structure is prepared; the device comprises an inner core, an interface layer and a shell from inside to outside, the inner core is a solid electrolyte matrix, the interface layer is a transition layer generated by reaction of the solid electrolyte matrix and a nano inert oxide, and the shell is a nano inert oxide layer. The material combines the advantages of high moisture resistance and wide electrochemical window of the nano inert oxide and the characteristics of high ionic conductivity and excellent mechanical property of the solid electrolyte, and the comprehensive performance of the material is remarkably improved through the synergistic effect of the components. The composite structure design not only solves the problem of performance limitation of a single material system, but also realizes collaborative optimization of ionic conductivity, environmental adaptability and electrochemical stability while ensuring the material stability.

The invention provides a composite sulfide solid electrolyte, a preparation method thereof and a lithium ion battery. The composite sulfide solid-state electrolyte comprises a sulfide solid-state electrolyte matrix and a composite layer coating the surface of the sulfide solid-state electrolyte matrix, the composite layer comprises an interface reaction layer and a coating layer from inside to outside, the coating layer comprises a halide material, and the interface reaction layer comprises an interface reactant obtained after the halide material and the surface of the sulfide solid electrolyte matrix are subjected to an interface reaction. According to the invention, under the action of the specific surface composite layer, the electrochemical window and mechanical property of the sulfide solid electrolyte are widened, the mechanical stability and electrochemical stability of the sulfide solid electrolyte and a positive electrode material are improved, and the interface reaction of the sulfide solid electrolyte is further inhibited.

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 relates to an organic solid electrolyte for an in-situ curing high-voltage positive electrode, a battery and a preparation method. The organic solid electrolyte is formed by in-situ polymerization of ether monomers, ester monomers, a lithium salt and a solvent through synergistic thermal initiation of double initiators. The electrolyte disclosed by the invention has the advantages that the ester polymer monomer and the ether polymer monomer are blended, and then the two monomers are respectively polymerized in a thermal initiation manner to form mutually crossed macromolecular long chains. The strategy can improve the interface stability of the electrode and the electrolyte and reduce the interface impedance of the electrode and the electrolyte. In the formed polymer network structure, the ester chain segment enhances the mechanical strength and widens the electrochemical window; and the ether chain segment provides flexible and lithium ion transmission channels. Due to the chemical complementarity of the ester monomers and the ether monomers, the overall performance of the composite polymer electrolyte is improved.

The invention discloses a fast-charging lithium ion battery electrolyte, a preparation method thereof and a lithium ion battery containing the fast-charging lithium ion battery electrolyte. The fast-charging lithium ion battery electrolyte comprises the following components: electrolyte salt, an organic solvent and an electrolyte additive, the electrolyte additive comprises a first additive and a second additive; the first additive is a multi-element sulfate ester additive, and the mass percentage of the multi-element sulfate ester additive is 0.05%-2% based on the total mass of the electrolyte being 100%. By adding the polybasic sulfate additive with a specific structure, adopting a composite solvent system and cooperating with the synergistic effect of other additives, lithium salt and other components, dual stability of positive and negative electrode interface films is realized, the electrochemical window of the electrolyte is widened, and the thermal stability and cycling stability of the electrolyte are improved; and finally, the battery has the advantages of fast charging capability, high voltage compatibility, long cycle life and high thermal safety at the same time.

The invention discloses an imidazolium ionic liquid modified magnesium ion battery electrolyte and a preparation method and application thereof. The imidazolium ionic liquid modified magnesium ion battery electrolyte is obtained by fully dissolving [EOE-A-Im] [TFSI] ionic liquid in an APC electrolyte. Wherein [EOE-A-Im] [TFSI] is a 1-allyl-3-(2-ethoxyethyl)-1H-imidazole-3-onium bis (trifluoromethylsulfonyl) imine salt, and APC is a total phenyl complex. The imidazolium ionic liquid modified magnesium ion battery electrolyte disclosed by the invention is relatively wide in electrochemical window, excellent in compatibility with electrodes, high in magnesium deposition-dissolution efficiency, low in overpotential and good in cycling stability; and the preparation method of the imidazolium ionic liquid modified magnesium ion battery electrolyte is simple and environment-friendly, and accords with green industrial production.

The invention belongs to the technical field of polymer electrolyte membrane materials, and particularly relates to a high-ionic-conductivity polymer electrolyte membrane and a preparation method thereof.The preparation method comprises the steps that 1, PEO and lithium salt are added into a polar aprotic solvent, and the mixture is rapidly and violently stirred to be completely dissolved; (2) adding a cross-linking agent and a photoinitiator into the mixed solution, and violently stirring to obtain a mixed solution; and (3) coating the mixed solution in a polytetrafluoroethylene template, heating to remove the solvent, and performing ultraviolet radiation. According to the invention, a three-dimensional cross-linked network is formed by photocuring of an acrylate group of the cross-linking agent, PEO chain segment crystallization is inhibited, and lithium salt anions (such as TFSI-) are physically embedded. A benzene ring structure in a cross-linked network endows the electrolyte membrane with flexibility, mechanical property deterioration caused by a plasticizer or a diluent is avoided, the compact structure of the electrolyte membrane can inhibit lithium dendrite growth, the ionic conductivity reaches 1.7 * 10 <-4 > S / cm, and the electrochemical window reaches 4.9 V. The method is simple in process and suitable for large-scale preparation of the high-energy-density solid-state lithium battery.

The invention discloses a lithium metal battery eutectic gel electrolyte and a preparation method and application thereof, and belongs to the field of solid electrolyte. The eutectic gel electrolyte is prepared by carrying out a photocuring reaction on a photocuring precursor solution containing a photoinitiator, and the photocuring precursor solution contains a bi-component liquid compound and a deep eutectic solvent; the two-component liquid compound comprises 4-acryloyl morpholine and a photocurable polyethylene glycol derivative; the deep eutectic solvent is formed from a liquid mixture comprising succinonitrile, lithium bis (trifluoromethylsulfonyl) imide and fluoroethylene carbonate. The eutectic gel electrolyte is composed of a deep eutectic solvent with functional groups such as cyano and sulfonyloxy, and a polymer electrolyte with functional groups such as ether oxygen and a unique skeleton structure. The advantages of high ionic conductivity, wide electrochemical window, high interface stability and the like can be endowed based on the interaction between functional groups and the space confinement effect of a polymer electrolyte skeleton structure.

The invention provides a modified positive electrode material and a preparation method and application thereof. The modified positive electrode material comprises a lithium manganese iron phosphate inner core and a coating layer coating the surface of the lithium manganese iron phosphate inner core, and the material of the coating layer comprises oxyfluoride; ti and S are co-doped in the lithium manganese iron phosphate core. Ti and S are co-doped in a lithium manganese iron phosphate core, Ti doping can introduce additional electron holes to enhance the intrinsic electron conductivity of the material, S doping can expand a lithium ion channel and improve the Li < + > diffusion rate, and the Ti doping and the S doping are synergistically optimized through two channels of electron conduction-ion migration, so that the rate capability and the cycling stability of the positive electrode material are improved; the oxyfluoride is adopted as a coating layer material, so that HF corrosion and dissolution of transition metal can be reduced, an interface side reaction is inhibited, meanwhile, the excellent thermal stability and wide electrochemical window of the oxyfluoride can inhibit decomposition and gas production of an electrolyte in a high-temperature environment, and the thermal stability and electrochemical stability of the modified positive electrode material are improved.

The invention discloses a preparation method of a polymer-sulfide solid electrolyte based on multi-scale interface design and application of the polymer-sulfide solid electrolyte in an all-solid-state lithium battery, sulfide electrolyte particles with three complementary functions of Li10SiP2S12, Li7P2S8I and Li3PS4 are utilized, and a compact and ion transmission path optimized structure is formed in a polymer matrix through a gradient distribution technology; the micron-sized particles construct a high-speed ion conduction trunk, the nano and submicron particles are tightly filled to greatly reduce the interface impedance, meanwhile, the introduction of Li7P2S8I widens an electrochemical window from the source of the material, the self-repairing functional component on the outermost layer endows the interface with dynamic intelligent response capability, and when the interface generates microcracks, the self-repairing functional component on the outermost layer can repair the surface of the material. Dynamic bonds contained in the material can be reversibly broken and reconstructed, self-repairing of damage is achieved, the endurance capacity of an interface to mechanical and chemical strain caused by temperature change and long-term circulation is enhanced, and finally high ionic conductance, excellent interface stability and wide temperature range adaptive capacity are successfully and cooperatively achieved.

The invention discloses a polymer electrolyte composite material for a high-temperature-resistant solid-state battery and a preparation method of the polymer electrolyte composite material, and belongs to the technical field of solid-state battery materials. The preparation method comprises the following steps: preparation of key functional components, preparation of a precursor solution, dispersion and compounding of the filler, film casting and heat treatment, and post-treatment. A dynamic thioether bond is introduced into a main chain to construct an oxygen-sulfur synergistic coordination network, and a multi-component interface chemical bonding and gradient curing process is combined, so that the problems that the ionic conductivity and the mechanical strength of the traditional polymer electrolyte cannot be considered at a high temperature, the filler is easy to agglomerate, the membrane has many defects and the like are solved; the obtained material still keeps high ionic conductivity and excellent mechanical stability at 150 DEG C, has a wide electrochemical window, and is suitable for high-safety and high-energy-density solid-state batteries.

The invention relates to the technical field of solid-state battery positive electrode materials, in particular to a double-layer coated halide positive electrode composite material, a preparation method thereof and a solid-state battery. The double-layer coated halide positive electrode composite material comprises a positive electrode material inner core, and a middle layer and an outer layer which sequentially coat the positive electrode material inner core; the material of the intermediate layer comprises a first halide electrolyte with a general formula of LiaMXb; and the material of the outer layer comprises a second halide electrolyte, and the general formula of the second halide electrolyte is LicAGXd or LieAOXf. By utilizing respective advantages of different halide electrolytes, the first halide electrolyte in contact with the positive electrode material is stable to a high-voltage positive electrode, and the second halide electrolyte in contact with the sulfide solid electrolyte layer is stable to a sulfide solid electrolyte; the incompatibility of a high-voltage positive electrode material and a narrow electrochemical window sulfide solid electrolyte can be relieved, the interface side reaction is effectively reduced, the battery impedance is reduced, and the electrochemical performance of a solid-state battery is improved.

The application relates to the technical field of solid-state batteries, in particular to a halide oxyde and a preparation method and application thereof. The application takes a molten salt Li a M b X c as raw material, reacts with an oxide A d O f in a molten state, removes steam impurities by means of high-temperature vacuum extraction, and obtains the halide oxyde solid-state electrolyte after cooling; the molten salt raw material is melted into an ionic melt at high temperature, oxygen elements are introduced to replace part of halogens, the hardness of the target electrolyte is reduced after cooling, the deformation ability at room temperature is improved, the obtained electrolyte has high conductivity, a wide oxidation electrochemical window, and the like. The prepared halide oxyde solid-state electrolyte is used for preparing a positive electrode, and the adhesion, actual micro contact area and ion migration rate between the electrolyte and positive electrode material particles are improved through melt infiltration, the positive electrode interface problem is effectively relieved, and the electrochemical performance of the full solid-state battery is improved.

The invention provides a negative plate of a solid-state battery. The negative plate comprises a current collector, a lithium-loving coating compounded on the current collector and a conductive layer compounded on the lithium-loving coating, the lithium-loving coating contains a lithium-loving element; the lithium-loving element comprises one or more of Mg, Pt, Sn, Ag, Al and Zn; and the conductive layer comprises a carbon material. By introducing the lithium-loving element and the high-potential material and utilizing a synergistic mechanism of the lithium-loving element and the high-potential material, the electrochemical window is further widened and the metal lithium deposition risk is reduced while the lithium deposition uniformity is improved. According to the negative electrode plate provided by the invention, the nucleation potential of the lithium-metal negative electrode plate and the resistance of the conductive material are controlled within a specific range, so that nucleation of lithium ions on the surface of the negative electrode current collector can be facilitated, meanwhile, the nucleation uniformity of the lithium ions on the surface of the negative electrode current collector can be improved, and the cycle life of the battery is further prolonged.

The invention belongs to the field of batteries, and particularly relates to a solid-state polymer electrolyte composite membrane, a preparation method thereof and a solid-state battery. The solid polymer electrolyte composite membrane comprises an MOF functional layer, an anti-reduction coating and an anti-oxidation coating, wherein the anti-reduction coating and the anti-oxidation coating are arranged on the two sides of the MOF functional layer respectively; the MOF functional layer comprises an intermediate layer base material formed by an organic polymer, and an inorganic solid electrolyte and an MOF-based ionic conductor MOF-ILE which are dispersed in the intermediate layer base material; the MOF-based ionic conductor MOF-ILE comprises an MOF material, an ionic liquid and a lithium salt. The electrolyte membrane can meet the multifunctional requirements of all-solid-state batteries, including high ionic conductivity of the electrolyte membrane, good electrode-solid electrolyte membrane interface compatibility, high electrochemical window, excellent mechanical strength and electrochemical stability, so that the electrical performance of the all-solid-state batteries is remarkably improved.

The invention discloses a chloride ion battery for realizing bromine / chlorine synergistic chemistry and a preparation method thereof, and belongs to the technical field of redox batteries. The chloride ion battery takes graphite paper coated with vanadium pentoxide and graphite as a positive electrode, wherein the mass ratio of the vanadium pentoxide to the graphite is (0.5: 1)-(2: 1); zinc foil is used as a negative electrode, and an electrolyte is a mixed aqueous solution of tetramethylammonium chloride and lithium bromide. A double-halogen system of a V2O5-graphite composite positive electrode is adopted, chlorine species are chemically stabilized through the action of bromine, BrCl is generated in the charging process to inhibit Cl2 formation, and meanwhile, the intercalation energy barrier of chlorine is reduced; according to the salt-in-water electrolyte based on tetramethylammonium chloride, an electrochemical window is expanded to 3.0 V, and BrCl hydrolysis is effectively inhibited. The high-voltage halogen ion battery prepared by the method can realize a 2.3 V discharge platform, provides a specific capacity of 600mAh g <-1 >, has a capacity retention rate of 90% after 200 cycles, and opens up a safe development path for the high-voltage halogen ion battery without toxic gas emission. In addition, the battery system is simple in structure and has remarkable cost benefits.

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to realizing stable work of a high-voltage lithium metal battery in a wide electrochemical window. The manufacturing method comprises the following steps: forming an initial battery cell; injecting a first electrolyte containing lithium nitrate, a lithium salt and an ether organic solvent into the initial cell; performing a first formation process; injecting a second electrolyte containing fluoroethylene carbonate, a lithium salt, a cyclic phosphazene derivative and a nitrile organic solvent into the initial cell; wherein the structural formula of the cyclic phosphazene derivative is shown in the specification, or R1-R8 are independently selected from alkoxy, cyano-containing alkoxy or fluorine-containing alkoxy, and at least one cyano-containing alkoxy and one alkoxy or fluorine-containing alkoxy exist in R1-R6; and performing a second formation process.

The invention discloses a sulfide solid electrolyte and a preparation method thereof, and relates to the technical field of batteries. The sulfide solid electrolyte comprises a Li6PS5Cl inner core and a Li3PO4 coating layer, wherein the surface of the Li6PS5Cl inner core is coated with the Li3PO4 coating layer. And the Li3PO4 coating layer can effectively block moisture and oxygen and inhibit the hydrolysis reaction of Li6PS5Cl. Compared with traditional Al2O3 coating, the Li3PO4 coating layer and Li6PS5Cl are high in lattice matching degree, the interface bonding force is high, and secondary reaction caused by falling can be effectively avoided. The introduced Li3PO4 can be used as a barrier layer or redox reaction of Li6PS5Cl is inhibited through a surface chemical passivation mechanism, the electrochemical window of the Li6PS5Cl material is improved, electron leakage can be reduced, and the material is very suitable for a high-voltage positive electrode material system and can significantly improve the energy density of a battery.

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 a sulfur-containing all-solid-state polymer electrolyte membrane, a preparation method and a lithium metal battery, and belongs to the technical field of polymer electrolytes.The method comprises the steps that 1, 4-phenylene-diacrylate and dimethyl tetrasulfide are evenly mixed and cooled to the room temperature after a reverse vulcanization reaction, and a polymer solid is obtained; the preparation method comprises the following steps: dissolving a polymer solid in dimethyl sulfoxide, adding bis (trifluoromethanesulfonyl) lithium imide, uniformly stirring and mixing, casting in a PTFE (Polytetrafluoroethylene) mold, uniformly spreading, and carrying out vacuum drying to obtain the sulfur-containing all-solid-state polymer electrolyte membrane. The ion transmission function of a liquid electrolyte is replaced by the solid ion conduction property, and the physical isolation function of a diaphragm is replaced by a compact and firm physical structure, so that the Li < + > diffusion energy barrier is reduced, the electrochemical window is widened, the interface impedance is reduced, and the interface compatibility between the positive and negative electrode materials and the solid electrolyte is improved; the lithium metal battery assembled by the electrolyte has excellent electrochemical performance and cycle performance.

The invention provides a wide-temperature-range high-specific-energy fluorinated gel electrolyte and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. Comprising a lithium salt, a (methyl) acrylate monomer and a fluorinated sulfonate plasticizer, the molar concentration of the lithium salt relative to the total volume of the fluorinated sulfonate plasticizer and the (methyl) acrylate monomer is 2-5 mol / L, and the volume ratio of the (methyl) acrylate monomer to the fluorinated sulfonate plasticizer is (2-4): (8-6). The gel electrolyte not only has the characteristics that the ionic conductivity at room temperature exceeds 2 mS / cm and the electrochemical window exceeds 5 V, but also has good stability matched with a high-voltage positive electrode and stability matched with a lithium metal negative electrode and a silicon carbon negative electrode, and shows good cycle performance in a wide temperature range (-20 to 60 DEG C).

The invention relates to the technical field of solid-state batteries, and discloses a polymer solid-state electrolyte and a preparation method thereof, and a solid-state battery, the polymer solid-state electrolyte is formed by complexing a fluorine-containing compound and lithium ions, the structural formula of the fluorine-containing compound is shown in the specification, 1 < = n < = 20, 1 < = x < = 50, 1 < = y < = 50, the molar ratio of the fluorine-containing compound to the lithium ions is (1-10): 1. The polymer solid electrolyte provided by the invention has relatively high room-temperature conductivity, relatively wide electrochemical window, excellent lithium stability and good electrochemical compatibility with a high-voltage positive electrode.

The invention discloses a solid-state electrolyte and a preparation method thereof, and a solid-state battery, the solid-state electrolyte is prepared from a polymer, and a lithium salt and an additive dispersed in the polymer, the additive comprises inorganic nanoparticles, a plasticizer and an ionic liquid, the polymer is polyvinyl ether of one of formulas P1 to P7, the number-average molecular weight of the polymer is 1 * 10 < 4 >-10 * 10 < 4 >; wherein m is a positive integer, Cy is cyclohexyl, iBu is isobutyl, nBu is n-butyl, and Bn is benzyl. The adopted polyvinyl ether is a three-dimensional isotactic polymer, and a main chain and a side chain do not contain chemical groups (such as hydroxyl) of reactive hydrogen, so that the oxygenolysis tendency of the electrolyte under high pressure can be remarkably reduced, and an electrochemical window is remarkably improved. The electrochemical window of the solid-state battery is improved to 4.8 V or above.

The invention discloses a solid-state battery, relates to the technical field of lithium ion battery preparation, and aims to solve the technical problems that the current solid-state battery is generally short in cycle life and poor in rate capability, the solid-state battery comprises a positive electrode, a negative electrode and a solid-state electrolyte layer, and the solid-state battery is prepared by adopting a hot-pressing melting method; wherein the positive electrode is a composite positive electrode film composed of an active material Li < 1.75 > Ti < 2 > (Mo < 0.25 > P < 0.75 > S < 3.8 > Se < 0.2 >) < 3 > and a binder, the negative electrode is a composite negative electrode film composed of a C3N3 carbon nitride material and a binder, and the solid electrolyte layer is a composite solid electrolyte film composed of LiWS2 and a binder; the binder is lithium lipoate or lipoic acid. The invention further discloses a preparation method of the solid-state battery and application of the solid-state battery in a new energy automobile. The solid-state battery disclosed by the invention is good in cycle performance and rate capability, simple in preparation process, low in synthesis temperature, relatively wide in electrochemical window and relatively good in electrochemical stability.

The invention belongs to the field of solid-state batteries, and particularly relates to a solid-state electrolyte with a wide electrochemical window and a solid-state lithium ion battery. According to the solid electrolyte, the metal oxyhalide and the lithium-containing zeolite are subjected to ball milling, so that the solid electrolyte with relatively high ionic conductivity and a wide electrochemical window is obtained. The solid-state electrolyte is prepared into a solid-state electrolyte membrane, the solid-state electrolyte membrane, a positive electrode and a negative electrode are assembled into a solid-state lithium battery, an ionic liquid electrolyte and a polymer monomer are added, and the solid-state lithium battery is obtained through in-situ polymerization. A polymer network exists in the solid-state lithium battery, so that the lithium ion transmission performance in the positive electrode, the negative electrode and the solid-state electrolyte and the interface transmission performance of lithium ions in the positive electrode, the negative electrode and the solid-state electrolyte can be effectively improved, and the solid-state lithium battery has higher discharge capacity and better cycling stability performance.

The invention relates to a solid electrolyte membrane and a preparation method thereof, and belongs to the technical field of lithium battery solid electrolyte. According to the invention, after the selected acrylate monomer as shown in the formula I is polymerized, the crystallinity of the fluorine-containing polymer is reduced, more space is provided for ion conduction, the dissociation effect of the lithium salt is enhanced, and the free ion concentration is increased; the precipitation-method white carbon black limits anion movement through abundant hydroxyl groups, so that the lithium ion transference number is increased; under the combined action of the three factors, the ionic conductivity of the solid electrolyte membrane is greatly improved. The fluorine-containing polymer has good toughness and self-supporting effect and wide electrochemical window and thermal stability, so that the application range of the solid electrolyte and the energy density, rate capability and service life of a battery using the electrolyte are improved on the whole.