33 results about "Electrochemical window" patented technology

The application belongs to the technical field of solid-state batteries, and relates to a solid-state electrolyte of a solid-state battery, in particular to a cerium doped MOFs based composite solid-state electrolyte and a preparation method and application thereof. 4+ / Ce 3+ / Ce 4+ The application induces the rich Zr 4+ / Ce 3+ / Ce 4+ Multi-valence active centers, combined with the regulation effect of the interface ion flow of the graphite phase carbon nitride (g-C3N4) two-dimensional layered material, significantly improve the comprehensive performance of the composite polymer solid-state electrolyte, such as ion conductivity, electrochemical window, electrochemical stability and the like.

The application discloses a fluorine quantum dot combined fluorinated UIO-66 (FUIO) molecular sieve composite polymer solid electrolyte and a preparation method and application thereof, and belongs to the technical field of lithium metal batteries. The electrolyte comprises H-FCDs@FUIO, polyethylene oxide and a lithium salt; the H-FCDs@FUIO is formed by combining fluorine quantum dots and FUIO through fluorophilic interaction, hydrogen bonding and coordination; and the FUIO is a fluorinated UIO-66 molecular sieve. The electrolyte has high ion conductivity, a wide electrochemical window, good stability and the like by introducing the double fluorine structure of the fluorine quantum dots and the FUIO molecular sieve and synergizing the polyethylene oxide, and when the electrolyte is applied to the preparation of a solid-state lithium metal battery, the Coulomb efficiency of the battery can be obviously improved and the cycle life of the battery is prolonged.

A high-temperature and high-pressure resistant composite solid electrolyte, its preparation method, and a high-temperature solid-state lithium battery using the electrolyte are disclosed. The composite solid electrolyte comprises a polymer matrix, a basic lithium salt, a lithium salt additive, and a nanofiber framework. The preparation method of the composite solid electrolyte includes S1: preparing the nanofiber framework; S2: coating the nanofiber framework to prepare a lithium-ion composite solid electrolyte. A high-temperature solid-state lithium battery includes the composite solid electrolyte manufactured using the above-mentioned composite solid electrolyte preparation method. This invention constructs a composite electrolyte system of "three-dimensional network structure nanofiber framework-PEO polymer matrix-interface regulator," introducing a three-dimensional network structure nanofiber framework to form a strong spatial physical confinement of polymer molecular chain segments, thereby improving the mechanical strength of the electrolyte at high temperatures. The addition of a high-pressure lithium salt additive decomposes under high voltage, forming an interfacial protective layer and broadening the electrochemical window of the electrolyte.

The application discloses a preparation method of a titanium carbide doped polymer solid electrolyte, which can effectively reduce the crystallinity of PEO, enhance the ionic conductivity of the polymer solid electrolyte and widen the electrochemical window by grafting PCL (polycaprolactone) on the surface of a two-dimensional material titanium carbide (MXene) and blending the PCL with a PEO (polyethylene oxide) blend.The steps adopted by the application are as follows: firstly, PCL is grafted on the surface of MXene through a one-pot method; then, the grafted material is mixed with PEO and LiTFSI (lithium bis(trifluoromethanesulfonyl)imide) in a certain proportion, is subjected to ultrasonic oscillation and is uniformly mixed by heating; finally, the solution is poured on a glass culture medium, the solvent is volatilized at room temperature, the solvent is removed by heating, and a solid polymer electrolyte film is obtained.The polymer solid electrolyte film prepared by the method of the application has good mechanical properties, high ionic conductivity, a wide electrochemical stability window, stable charge and discharge processes of an assembled battery and excellent cycle performance.

The application discloses a lanthanum-based oxychloride nanocrystal-amorphous composite solid electrolyte material and a preparation method and application thereof. a O b ] unit, 1<=a<=5, 1<=b<=5; wherein the chemical general formula of the solid electrolyte material is Li 2x Ta 0.25 La 0.5 Cl 2.75 O x , 0.15<=x<=0.2. The preparation method of the solid electrolyte material is used for preparing a solid electrolyte or a composite positive electrode of a lithium ion solid battery. By introducing an oxygen-containing precursor Li2O to replace LiCl, the application utilizes oxygen to preferentially coordinate with Ta to form a distorted [TaCl a O b ] unit to produce local amorphization, and forms a nanocrystal-amorphous composite structure. The composite structure retains a complete one-dimensional ion transmission channel of the LaCl3 skeleton, and provides an additional three-dimensional ion seepage network through the amorphous phase, thereby significantly improving ion conductivity, and having good electrochemical stability and mechanical deformation capacity, and exhibiting high ion conduction capacity, a wide electrochemical window and excellent cycle stability in a solid battery system.

This invention discloses a sulfide-based fluorine-free high-entropy electrolyte in the field of battery technology, comprising a composite lithium salt system, a sulfide solvent, and a fluorine-free inert diluent. The composite lithium salt system consists of at least two lithium salts selected from lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium difluorooxalate borate, lithium nitrate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium trifluoroacetate, and lithium dioxalate borate. The sulfide solvent is selected from one or more of dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl propyl sulfide, methyl butyl sulfide, dimethyl disulfide, cyclohexane sulfide, phenyl sulfide, and diphenyl disulfide. The fluorine-free inert diluent is at least one of cyclopentane, cyclohexane, n-hexane, benzene, n-butane, isobutane, and n-pentane. This invention solves the problems of existing electrolytes, such as difficulty in balancing conductivity and interfacial stability, poor high and low temperature performance, and narrow electrochemical window; and achieves a comprehensive improvement in the overall performance of the electrolyte.

This invention relates to the field of electrochemical energy storage materials and lithium metal battery technology, specifically to an in-situ polymerized solid electrolyte, its preparation method and application, and lithium metal batteries. This in-situ polymerized solid electrolyte is prepared by heating a ring-opening polymerization reaction using 1,3-dioxolane and 1,1,1-trifluoro-2,3-epoxypropane as reactants, sodium thiosulfate as an initiator, and lithium salt and plasticizer fluoroethylene carbonate as a precursor solution. This electrolyte possesses numerous amorphous regions, which is beneficial for ion transport, enabling the formation of a self-supporting dense structure. It also ensures close contact with the electrode, resulting in a pure interface that effectively reduces interfacial impedance and avoids side reactions at the electrode interface. Furthermore, it enhances oxidation resistance, broadens the electrochemical window, and inhibits dendrite growth. While achieving good mechanical properties, it also improves the cycle stability and safety performance of the battery. It has excellent application prospects in lithium metal batteries, lithium-ion batteries, solid-state energy storage systems, or flexible electronic devices.

The application provides a polymer electrolyte, a preparation method thereof and a lithium metal battery, and belongs to the technical field of lithium metal batteries.The polymer electrolyte comprises a polymer and a lithium salt distributed in the polymer, and monomers for synthesizing the polymer comprise at least one of silane acrylate compounds with structures as shown in Formula I, wherein R1, R2 and R3 comprise at least one of an alkyl group, an alkoxy group, a halogenated alkyl group and a siloxane group.The application selects specific types of monomers, so that the room temperature ionic conductivity of the polymer electrolyte exceeds 1*10 ‑4 S / cm, the electrochemical window exceeds 5V, and the polymer electrolyte also has good stability for matching high-voltage positive electrodes and lithium metal negative electrodes.

The application discloses a functional partition type brush-shaped polymer electrolyte membrane and a preparation method thereof, and belongs to the technical field of lithium metal batteries. The electrolyte membrane comprises 50-80% of a polymer matrix, 10-45% of a lithium salt and 5-10% of a porous support material in percentage by mass, and the polymer matrix is a liquid functional partition type brush-shaped polymer which is polymerized from polymerizable fluorine-containing monomers and / or polymerizable cyano-containing monomers and polymerizable ether chain monomers. The polymer matrix has short-chain polar units integrated in the side chains, which can serve as dissociation and interface centers, promote lithium salt dissociation and induce the formation of a solid-state electrolyte interface film rich in inorganic components, thereby stabilizing a lithium metal negative electrode. The long-chain flexible ether chains integrated in the side chains can serve as ion transmission channels and provide fast ion migration capability. As a result, the application can solve the problems of insufficient room temperature ionic conductivity of the existing electrolyte, poor lithium dendrite suppression capability, narrow electrochemical window, poor high-temperature stability, poor safety, unstable interface and the like.

This invention relates to a multifunctional composite ion-conducting membrane for all-solid-state lithium batteries, its preparation method, and its applications. The composite ion-conducting membrane comprises a porous base membrane and a composite solid electrolyte filling the pores of the porous base membrane and covering one or both sides of the porous base membrane. More than 70% of the pores in the porous base membrane are filled with the composite solid electrolyte. The porous base membrane has a thickness of 3-100 μm, a porosity of 50%-90%, and a pore size of 0.001-100 μm. The pore structure includes isolated pores and interconnected pores. The composite ion-conducting membrane has a thickness of 5-150 μm, an elongation ≥10%, and a tensile strength ≥10 MPa. This invention uses a high-porosity porous base membrane combined with a variable-roller rapid heating and pressing process to obtain a high-filling-rate composite ion-conducting membrane, effectively overcoming existing problems such as large membrane thickness, uneven membrane thickness, poor mechanical strength, low ionic conductivity, and narrow electrochemical window, ensuring high safety, high energy density, and cycle stability of solid-state batteries.

The application provides a halide solid electrolyte, a preparation method thereof and a new energy automobile solid battery. Specifically, the preparation method comprises the following steps: under the protection of an inert atmosphere, mixing a host component, a rare earth element type dopant, a transition metal element type dopant, a main group metal element type dopant, an inorganic modifier and an organic modifier to obtain a mixed powder; under the protection of an inert atmosphere, heating the mixed powder to 450-600 DEG C for a melting reaction, the reaction time is 4-8 hours, and then cooling to room temperature to obtain a halide solid electrolyte crude product; and crushing and drying the halide solid electrolyte crude product to obtain a halide solid electrolyte. The halide solid electrolyte of the application realizes the synergistic improvement of ion conductivity, an electrochemical window and humidity stability, and improves the mechanical performance. The preparation process is simple, the energy consumption is low, the production can be scaled up, and the material and manufacturing costs are greatly reduced.

This invention provides a high-voltage electrolyte for lithium-ion batteries containing nickel manganese oxide, its preparation method, and its application. The high-voltage electrolyte comprises a mixed lithium salt, functional additives, and a mixed solvent. The functional additives include a combination of at least two of the following: polyethylene succinate, aromatic amine compounds, organoboroesters containing N-B-O-C structures, or compounds containing siloxane groups. This invention constructs a stable electrolyte system through multi-component synergistic design, extending the electrochemical window to 5.0V and above, meeting the high-voltage operating requirements of lithium-ion batteries containing nickel manganese oxide, effectively suppressing electrolyte decomposition under high voltage, and significantly improving the stability of lithium-ion batteries containing nickel manganese oxide. The combination of functional additives exerts a synergistic enhancing effect, rapidly forming a film on the positive electrode surface and reducing electrolyte viscosity to improve ionic conductivity, solving the problem of poor kinetic performance of traditional high-concentration electrolytes and ensuring high stability of the electrode / electrolyte interface.

The present application relates to a kind of eutectic electrolyte, preparation method and application in secondary battery, eutectic electrolyte includes: lithium salt or sodium salt and sulfuric acid ester-containing compound;The mass ratio of lithium salt and sulfuric acid ester-containing compound is 1:1~1:10;The mass ratio of sodium salt and sulfuric acid ester-containing compound is 2:5~3:5;Eutectic electrolyte is the eutectic mixture formed by lithium salt or sodium salt and sulfuric acid ester-containing compound by hydrogen bond interaction;The ionic conductivity of eutectic mixture is greater than 10 ‑4 S / cm at room temperature;Since the eutectic electrolyte provided by the present application has high ionic conductivity, wide electrochemical window and other excellent electrochemical properties, the eutectic electrolyte of the present application is applied to secondary battery, has good cycle performance and rate performance at room temperature, and the interface is stable.In addition, eutectic electrolyte also has low volatility and flame retardancy, has excellent safety.

A composite solid-state polymer electrolyte membrane and its preparation method, and a solid-state lithium-ion battery, are disclosed. The preparation method of the composite solid-state polymer electrolyte membrane includes: chemically modifying the surface of an inorganic filler using a boron-containing silane coupling agent to anchor boron-containing groups onto the surface of the inorganic filler, thus preparing a modified filler; dissolving polyethylene oxide, lithium salt, hydrogen-extractable photoinitiator, and multifunctional unsaturated monomer in an organic solvent to prepare a precursor solution; dispersing the modified filler in the precursor solution to prepare a composite slurry; and forming the composite slurry into a film, followed by ultraviolet light irradiation to initiate a cross-linking reaction, forming a three-dimensional cross-linked network, thus preparing the composite solid-state polymer electrolyte membrane. The preparation method of this application, by covalently anchoring boron-containing groups and constructing a three-dimensional cross-linked network through a hydrogen extraction mechanism, can reduce additive migration and loss, improve membrane mechanical strength, and generate a boron-rich inorganic interface membrane in situ under high pressure, which is beneficial for broadening the electrochemical window and improving battery cycle stability.

This invention relates to the field of polymer solid electrolyte technology, disclosing a copolymer of polysiloxane containing perfluoroalkyl ether side chains and polyethylene glycol, its preparation method, and its applications. The invention first synthesizes a polysiloxane containing perfluoroalkyl ether side chains by reacting a perfluoroalkyl vinyl ether with a side-hydrogen-containing silicone oil, and then copolymerizes it with polyethylene glycol diacrylate to obtain a copolymer. The copolymer is then mixed with a lithium salt and cured under in-situ ultraviolet light to obtain a polymer solid electrolyte. By introducing a perfluoroalkyl vinyl ether, the invention leverages the high electronegativity and strong electron-withdrawing ability of fluorine to enhance the antioxidant properties of polymer solid electrolytes and broaden the electrochemical window. The electrochemical window of the polymer electrolyte film of this invention reaches 4.76 V, and the ionic conductivity reaches 4.36 × 10⁻⁶. ‑5 S·cm ‑1 .

The application belongs to the technical field of electrolytes, and particularly relates to a fluorine-containing zwitterionic polymer gel electrolyte and a preparation method and application thereof. The fluorine-containing zwitterionic polymer gel electrolyte is prepared by using fluorine-containing monomers, zwitterionic monomers and 1-n-butyl-1-methyl pyrrolidine di(trifluoromethyl sulfone) imide ionic liquid as raw materials, mixing the three to form an ionic liquid system, mixing lithium salt in the ionic liquid system, and then initiating thermal polymerization by using an initiator. The fluorine-containing zwitterionic polymer gel electrolyte obtained by the application has high mechanical toughness, a wide electrochemical window and super-low-temperature ionic conduction characteristics, and can simultaneously realize lithium metal negative electrode dendrite growth inhibition, interface side reaction elimination and full-weather battery stability improvement.

This invention relates to the field of solid-state battery separator technology, specifically disclosing a high-performance separator, its preparation process, and its application in solid-state batteries. Through the molecular design of a reactive multifunctional monomer (N,N-disubstituted acrylamide-type phosphonate-based ferrocene derivative, Fc-AAm-PA), the acid-base balance regulation of partial lithiation, dual covalent immobilization, and the synergistic effect of a double-sided asymmetric composite structure, Fc-AAm-PA is embedded in a PI porous framework, a polyether acrylate crosslinking network, and a fast ion conductor (LLZTO) composite system. The resulting high-performance composite solid-state separator simultaneously achieves synergistic enhancements in multiple properties within a single separator system, including high ionic conductivity, high mobility number, wide electrochemical window, suppression of lithium dendrites, high-voltage cathode interface resistance, and suppression of redox shuttle. This provides a key separator material solution for high-energy-density, long-life, and high-safety lithium metal solid-state batteries.

The present application relates to a kind of based on precipitation strengthening polymer alloy Full-solid electrolyte, preparation method and application, the full-solid electrolyte is full-solid polymer electrolyte, including polymer alloy matrix and metal salt, polymer alloy matrix is composed of first, second, third high molecular compound, wherein second high molecular compound and third high molecular compound form block copolymer, third high molecular compound is compatible with first high molecular compound and incompatible with second high molecular compound, block copolymer forms second high molecular compound rigid skeleton and first high molecular compound ion channel interpenetrating continuous co-continuous microstructure in first high molecular compound by precipitation behavior.The present application decouples ion transport and mechanical support function, can simultaneously realize high ionic conductivity, high mechanical strength, high cation migration number, wide electrochemical window and high thermal stability, suitable for full-solid battery.

The present application relates to a kind of solid-state polymer electrolyte based on block copolymer, preparation method and application, solid-state polymer electrolyte includes: block copolymer, metal salt and porous base film;The mixture of block copolymer and metal salt is distributed in the pore of porous base film and on surface;The molecular weight of block copolymer is 200g / mol-2000000g / mol;The solid-state polymer electrolyte based on block copolymer provided by the embodiment of the present application has the advantages of high ionic conductivity, wide electrochemical window, good chemical stability and the like, and has good compatibility with base film.The solid-state polymer electrolyte based on block copolymer provided by the present application can not only match commonly used positive electrode material with narrow voltage range, but also can match high-voltage positive electrode material and metal negative electrode, and can effectively improve the cycle stability of battery.

Disclosed are novel electrolytes, and techniques for making and devices using such electrolytes, which are based on compressed gas solvents. Unlike conventional electrolytes, disclosed electrolytes are based on “compressed gas solvents” mixed with various salts, referred to as “compressed gas electrolytes.” Various embodiments of a compressed gas solvent includes a material that is in a gas phase and has a vapor pressure above an atmospheric pressure at a room temperature. The disclosed compressed gas electrolytes can have wide electrochemical potential windows, high conductivity, low temperature capability and / or high pressure solvent properties. Examples of a class of compressed gases that can be used as solvent for electrolytes include hydrofluorocarbons, in particular fluoromethane, difluoromethane, tetrafluoroethane, pentafluoroethane,. Also disclosed are battery and supercapacitor structures that use compressed gas solvent-based electrolytes, techniques for constructing such energy storage devices. Techniques for electroplating difficult-to-deposit materials using compressed gas electrolytes as an electroplating bath are also disclosed.

This invention discloses a method for preparing thiophene-functionalized sorbitol acetal compounds, comprising the following steps: at room temperature, adding the raw material compound D-sorbitol and 3-thiophene formaldehyde, an acidic catalyst, and a solvent to a container equipped with a stirring device, reacting at 80°C until a large amount of product precipitates, adding an organic base to quench the reaction, and filtering to obtain the sorbitol acetal compound; when the compound prepared by this invention is used as an electrolyte additive, the prepared ionic liquid zinc ion electrolyte has high conductivity, wide electrochemical window, excellent thermal stability, and low flammability, and the zinc ion transference number is significantly improved compared with ordinary ionic liquid zinc ion electrolytes.

This invention belongs to the field of solid-state battery technology, specifically relating to a Pebax / PEO composite solid-state battery and its preparation method. The Pebax / PEO composite solid-state battery includes an integrated positive electrode, a negative electrode side film, and a lithium metal sheet. The integrated positive electrode includes a positive electrode and a composite film layer above the positive electrode. The integrated positive electrode is obtained by dissolving a polyether block amide copolymer and a lithium salt, adding inorganic fillers, stirring until homogeneous, casting the resulting composite slurry onto the positive electrode, and then drying. The negative electrode side film is obtained by dissolving polyethylene oxide and a lithium salt, adding inorganic fillers, stirring until homogeneous, casting, and drying. The bilayer composite film, as a solid electrolyte, can better adapt to the high oxidizing properties of the positive electrode material and the high reducing properties of the negative electrode lithium metal, broadening the electrochemical window, improving ionic conductivity and the energy density of the solid-state battery, and ensuring a longer cycle life.

The application provides a core-shell composite material, a preparation method and application thereof. The core-shell composite material comprises an inner core, a first coating layer coated on the surface of the inner core, and a second coating layer coated on the surface of the first coating layer. The inner core is a first electrolyte body; the first coating layer is a surface modifier; and the second coating layer is a sodium / lithium-based fluoride. The surface modifier can cooperate with a sanding technology to make the surface structure of the electrolyte body crystal grain disordered, and contains abundant lipophilic hydrophobic groups, so that the first coating layer has strong hydrophobicity, and the problems of low mechanical strength and water absorption in storage of the core-shell composite material as an electrolyte in the application process are solved. The sodium / lithium-based fluoride ensures the bonding strength and coating compactness of the second coating layer. The core-shell composite material as a solid-state electrolyte has excellent ionic conductivity, chemical structure stability, hydrophobicity and a wide electrochemical window.

A polyoxymethylene-based all-solid-state polymer electrolyte prepared by in-situ ring-opening polymerization is used in forming an all-solid-state secondary lithium battery. A trioxymethylene monomer, an additive and lithium salt initiates in-situ ring-opening polymerization on a porous support material through a catalyst to form the all-solid-state polymer electrolyte, which has a thickness of 10 μm-800 μm, an ionic conductivity of 4×10−5 S / cm−8×10−3 S / cm at room temperature and an electrochemical window not lower than 4.2 V.

This invention discloses a solid electrolyte, a lithium-based energy storage device, and a preparation method thereof. The solid electrolyte is obtained by curing an electrolyte solution with an ultraviolet lamp. The electrolyte solution includes polyethylene glycol dimethacrylate, an initiator, and a monomer. The monomer contains fluorosulfonyl groups and ester groups. The presence of fluorosulfonyl groups in the monomer side chains can reduce the crystallinity of the polymer, effectively forming a passivation layer on the surface of the lithium anode, expanding the electrochemical window of the battery, thereby improving the cycle life of the battery. The formed flexible polymer skeleton can increase the compatibility between the electrolyte and the electrode, thereby reducing the interfacial resistance. The passivation layer can uniformly shape the interfacial electric field, regulate the diffusion of lithium ions, thereby effectively suppressing dendrite growth and achieving dense and uniform deposition. The lithium-based energy storage device using the monomer-containing electrolyte of this invention can greatly improve the cycle life of lithium half-cells, significantly improve the utilization rate of lithium metal anodes, effectively reduce the polarization voltage of the battery, and significantly improve the coulombic efficiency of the battery.

The application provides a halide electrolyte, a positive electrode sheet and a solid-state battery. The halide electrolyte comprises a core LiNbOX4 and a modified layer Li y+2w‑3x A x M w X y ; X is one or more of fluorine, chlorine, bromine and iodine, A is at least one of Al and Ga, M is at least one of O and S, 0.5<=x<=3, 0.5<=w<=2, and y>=1. The modified layer material has an A-X ionic bond which is easily polarized. Under stress, plastic deformation is more likely to occur through the slippage and recombination of the ionic bond, the solid-solid interface contact impedance is reduced, and the rate performance is improved. The modified layer with a low reduction potential forms a potential barrier on the surface of the core, isolates the electron transmission path between the LiNbOX4 electrolyte and the electrode, avoids the reduction reaction of Nb 5+ , reduces the reduction potential of the halide electrolyte, widens the electrochemical window, and improves the cycle performance of the battery.

The application discloses a zinc-selenium battery based on electrolyte-cathode-diaphragm synergistic regulation and a preparation method and application thereof, and belongs to the technical field of zinc ion battery materials. The zinc-selenium battery comprises a zinc negative electrode, a selenium-loaded graphene aerogel cathode, an oxidized graphene modified diaphragm and an ionic liquid electrolyte. The ionic liquid electrolyte is prepared by Lewis acid-base reaction of 1-ethyl-3-methyl imidazole chloride salt and zinc chloride; the cathode is prepared by loading selenium on graphene aerogel formed by reduction, freeze-drying and calcination of oxidized graphene; and the diaphragm is prepared by suction filtration of an oxidized graphene layer on the surface of a glass fiber diaphragm, and the coated surface faces the cathode. The application eliminates water molecules by using the ionic liquid electrolyte to broaden the electrochemical window and inhibit the zinc negative electrode side reaction, improves the conductivity by using the graphene aerogel cathode to activate the six-electron transfer reaction, and inhibits the shuttle effect by using the oxidized graphene modified diaphragm to adsorb polyselenides. The battery has an initial capacity of 752 mAh g ‑1 at a current density of 1 A g ‑1 , and still maintains a capacity of 534 mAh g ‑1 after 228 cycles, with a capacity retention rate of 71%. The application has a simple preparation process, low cost, excellent electrochemical performance and good application prospect.

The application discloses a high-voltage sodium ion battery electrolyte. The electrolyte comprises ester solvents and ether solvents, a sodium salt and an additive; the additive is selected from ethyl 4,4,4-trifluorobutyrate or a combination of ethyl 4,4,4-trifluorobutyrate and triphenyl phosphate. The application solves the problems of easy decomposition of the electrolyte under high voltage and low stability of the electrolyte, increases the electrochemical window of the electrolyte and improves the cycle performance of the battery.

This invention relates to the field of electrochemical energy storage materials and lithium metal battery technology, specifically to an in-situ polymerized solid electrolyte, its preparation method and application, and lithium metal batteries. This in-situ polymerized solid electrolyte is prepared by heating a ring-opening polymerization reaction using 1,3-dioxolane and 1,1,1-trifluoro-2,3-epoxypropane as reactants, sodium thiosulfate as an initiator, and lithium salt and plasticizer fluoroethylene carbonate as a precursor solution. This electrolyte possesses numerous amorphous regions, which is beneficial for ion transport, enabling the formation of a self-supporting dense structure. It also ensures close contact with the electrode, resulting in a pure interface that effectively reduces interfacial impedance and avoids side reactions at the electrode interface. Furthermore, it enhances oxidation resistance, broadens the electrochemical window, and inhibits dendrite growth. While achieving good mechanical properties, it also improves the cycle stability and safety performance of the battery. It has excellent application prospects in lithium metal batteries, lithium-ion batteries, solid-state energy storage systems, or flexible electronic devices.

The application provides a battery monomer and a manufacturing method thereof, a battery device, a power utilization device and an energy storage device. The manufacturing method of the battery monomer comprises the following steps: preparing a polymer electrolyte film; sequentially stacking a positive electrode sheet, the polymer electrolyte film and a negative electrode sheet, and then putting the stacked sheet or the wound sheet into a shell after a stacking treatment or a winding treatment to obtain an initial battery cell; and performing a formation process on the initial battery cell to obtain the battery monomer. By combining a phosphazene skeleton with intrinsic flame-retardant characteristics and reversible borate dynamic covalent bonds, and by synergistically introducing ionic liquids and inorganic fast ion conductors, a multifunctional polymer electrolyte system with self-repairing capability, high ionic conductivity, excellent electrochemical stability and intrinsic flame retardancy is constructed, so that the following effects can be achieved simultaneously: significant improvement of room temperature conductivity, self-repairing after damage, effective widening of an electrochemical window and fundamental improvement of safety performance, thereby providing key material support for the practicalization of high-performance solid-state batteries.