1839 results about "Polymer electrolytes" patented technology

The invention provides a self-repairing solid electrolyte membrane, a preparation method thereof, a solid-state battery and a mechanical device. The self-repairing solid electrolyte membrane comprises an organic framework and a polymer electrolyte, pores of the organic framework are filled with the polymer electrolyte, the polymer electrolyte is formed by polymerizing a polymeric monomer and a first lithium salt in the pores of the organic framework, the polymeric monomer contains a self-repairing S-S bond, and the first lithium salt contains a second lithium salt. The polymeric monomer also contains a C-O bond and a C = C bond. Therefore, the self-repairing solid-state electrolyte membrane has excellent mechanical properties and high ionic conductivity, and the solid-state battery prepared by adopting the self-repairing solid-state electrolyte membrane has high energy density, long cycle life and reliable safety.

The invention discloses a self-repairing polymer electrolyte, a preparation method and application thereof, and a polymer lithium battery, the self-repairing polymer electrolyte comprises the following preparation raw materials by mass: 50-100 parts of polysiloxane diacrylate, 1-10 parts of disulfide diacrylate, 10-40 parts of a cross-linking agent, 60-120 parts of a plasticizer, 60-120 parts of a lithium salt, and 1-10 parts of a photoinitiator. According to the self-repairing polymer electrolyte disclosed by the invention, a thiol-ene click reaction can be carried out between carbon-carbon double bonds in polysiloxane diacrylate and disulfide diacrylate and sulfydryl of the cross-linking agent, so that a dynamic disulfide bond and hydrogen bond network structure is endowed to the self-repairing polymer electrolyte; and the dynamic disulfide bond and the hydrogen bond can enable the electrolyte membrane to realize self-healing at room temperature without external stimulation.

The invention relates to the technical field of lithium battery polymer solid electrolyte materials, and discloses a high-pressure-resistant in-situ polymerization quasi-solid electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out esterification reaction on bacterial cellulose and 2-bromoisobutyryl bromide to obtain bromine-modified bacterial cellulose, grafting a double-block polymer side chain on the surface of the bromine-modified bacterial cellulose to obtain a one-dimensional polymer brush, and preparing a one-dimensional polymer brush film; a one-dimensional polymer brush film is used as a supporting film, an in-situ polymerization precursor solution is dropwise added to the surface of the supporting film, and the high-pressure-resistant in-situ polymerization quasi-solid electrolyte film is obtained through in-situ ring opening polymerization. The prepared high-pressure-resistant in-situ polymerization quasi-solid-state electrolyte membrane has excellent mechanical performance, the thickness of polymer electrolyte can be reduced, and growth of lithium dendrites can be inhibited; the rich pore structure is beneficial to rapid transmission of lithium ions; and the block in the side chain is beneficial to lithium ion transmission and lithium metal uniform deposition, and improves the stability of the electrolyte membrane in a high-voltage environment.

The invention discloses a lithium battery polymer solid electrolyte membrane capable of rapidly polymerizing at room temperature as well as a preparation method and application thereof, and belongs to the field of polymer electrolyte. The preparation method of the lithium battery polymer solid electrolyte membrane provided by the invention comprises the following steps: uniformly mixing polyethylene glycol methyl ether methacrylate and acrylonitrile according to a preset proportion to obtain a blended solution; sequentially adding lithium bis (trifluoromethanesulfonimide), divinylbenzene and benzoin diethyl ether into the blended solution, and uniformly mixing to obtain a precursor solution; and coating the precursor solution, and carrying out ultraviolet curing to obtain the lithium battery polymer solid electrolyte membrane. According to the lithium battery polymer solid electrolyte membrane provided by the invention, the voltage withstanding characteristic and the high ion conduction performance of the polymer electrolyte can be simultaneously improved, and the lithium battery polymer solid electrolyte membrane has a great gain on battery circulation and stability.

The invention relates to the technical field of all-solid-state lithium metal batteries, in particular to a cellulose paper-based polymer solid electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing N-methylacetamide and lithium bis (trifluoromethanesulfonyl) imide to obtain a eutectic solvent; the preparation method comprises the following steps: mixing a eutectic solvent, polyethylene glycol oxalate, acrylamide and a thermal initiator to obtain a eutectic polymer electrolyte precursor; and soaking cellulose paper in the eutectic polymer electrolyte precursor, and carrying out hot-pressing polymerization to obtain the cellulose paper-based polymer solid electrolyte. The cellulose paper-based polymer solid electrolyte prepared by the invention is soft in texture and can be better attached to an electrode, the problem of poor contact between the electrode and an electrolyte interface is solved, and the interface impedance is reduced by fusing the characteristics of low viscosity and high conductivity of the eutectic solvent and the supporting effect of the cellulose paper; the ion transmission efficiency is improved, and conditions are provided for long-term stable circulation of the battery.

The invention discloses a multi-effect flame-retardant in-situ gel polymer electrolyte and application thereof. The electrolyte is a gel polymer electrolyte with a three-dimensional network structure prepared from a first flame retardant, a second flame retardant, a cross-linking agent, an initiator and a liquid electrolyte in situ, the first flame retardant is an acrylate liquid-phase monomer containing a phosphorus element, and the content of the first flame retardant accounts for 1-4wt% of the total mass of the electrolyte; the second flame retardant is an acrylate liquid-phase monomer containing a fluorine element, and the content of the second flame retardant accounts for 1-4wt% of the total mass of the electrolyte; the content of the cross-linking agent accounts for 1-2wt% of the total mass of the electrolyte; the content of the initiator accounts for 0.05-1wt% of the total mass of the electrolyte; and the balance is liquid electrolyte. According to the invention, the flame retardant is effectively constructed on a three-dimensional network skeleton, so that the flame-retardant effect of the gel polymer electrolyte is enhanced under the synergistic effect of phosphorus and fluorine while the electrochemical performance is not sacrificed.

The invention relates to an in-situ cured silicon-based composite negative pole piece as well as a preparation method and application thereof. The silicon-based composite negative pole piece comprises a negative pole piece and a polymer electrolyte layer which is cured in situ and coats the surface of the negative pole piece; the polymer electrolyte layer is obtained through in-situ polymerization reaction of a precursor solution applied to the surface of the negative pole piece; the precursor solution contains a fluoroalkyl functional group; and the negative pole piece comprises a silicon-based material of which the surface is rich in hydroxyl. The composite negative pole piece disclosed by the invention not only can effectively limit the volume expansion of a silicon negative pole in a circulation process and reduce the phenomena of particle pulverization and interface separation, but also remarkably enhances the adhesive force among active substance particles, and ensures the structural integrity of the pole piece and the efficient transmission of ions and electrons. The silicon-based negative pole piece can form a stable solid-solid interface with the solid electrolyte through the polymer coating layer, so that the interface impedance is remarkably reduced, and the ion conduction efficiency is improved, thereby enhancing the cycling stability and safety performance of the battery while improving the energy density of the battery.

The invention belongs to the technical field of water electrolysis hydrogen production diaphragms, and relates to coating slurry for a composite diaphragm in an alkaline electrolytic cell and a preparation method of the coating slurry. The coating slurry comprises a high-molecular polymer, an inorganic hydrophilic oxide, a polymer electrolyte, a pore-foaming agent and an organic solvent. The high-molecular polymer is polysulfone, and the inorganic hydrophilic oxide is titanium dioxide; and the polymer electrolyte is acacia gum. And the pore-foaming agent is polyvinylpyrrolidone. Titanium dioxide is used as a filler, so that the hydrophilicity of the hydrophobic polysulfone membrane can be improved, and the transfer of hydroxyl ions is facilitated. Hydroxyl, amino and other hydrophilic groups of the acacia gum are migrated to a membrane-water interface, and the groups and a membrane matrix are combined to form a hydrogen bond network, so that the stability and the water adsorption capacity of the membrane are enhanced, and the composite membrane with low surface resistance, smooth surface, compact coating and good mechanical capacity is obtained. The nylon and the acacia gum are adopted, cost is low, and large-scale production is facilitated.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention discloses deep eutectic gel polymer electrolyte as well as preparation and application thereof, belongs to the technical field of battery electrolyte, solves the problems of low thermal stability, low ionic conductivity and poor mechanical property in the prior art, and comprises a bimetallic salt-eutectic solvent and a polymer chain which are dynamically crosslinked and constructed, the bimetallic salt-eutectic solvent comprises lithium ions, heterogeneous metal salt and Lewis base, and the polymer chain is formed by free radical polymerization, atom transfer radical polymerization (ATRP) or reversible addition-fragmentation chain transfer radical polymerization (RAFT). According to the invention, the deep eutectic solvent is introduced as a reaction solution, so that the organic gel monomer is subjected to photopolymerization or thermal polymerization in the solution, the elongation at break can reach more than 500%, the organic gel has excellent mechanical stretchability, a polymer network is formed by utilizing a long-chain molecular formula of a polymer chain, the deep eutectic solution is wrapped in the polymer network, and the organic gel has excellent thermal stability; and the good ionic conductivity of the electrolyte is ensured.

Disclosed are polymers and polymer compositions comprising metalized polyphosphazene. Also disclosed are polymer electrolytes comprising the disclosed herein polymers and polymer compositions, and film separators comprising polymers and polymer compositions. Also disclosed are batteries comprising an anode, a cathode and polymer electrolytes. Disclosed are also methods of making polymers, polymer compositions, and batteries.

The invention provides a gel-state polymer electrolyte as well as a preparation method and application thereof, and belongs to the field of batteries. The gel-state polymer electrolyte provided by the invention comprises the following preparation raw materials: a polar organic solvent, a lithium salt, a lithium salt additive, a liquid flame retardant, a liquid monomer and an initiator, the polar organic solvent comprises 1, 3-dioxolame and ethylene glycol dimethyl ether; the dosage ratio of the lithium salt to the polar organic solvent is 1 mmol: (0.5-2) mL; the mass of the lithium salt additive is 1.5-5% of the total mass of the lithium salt and the polar organic solvent; the volume of the liquid flame retardant is 10-20% of the volume of the polar organic solvent; the volume of the liquid monomer is 10-20% of the volume of the polar organic solvent; the mass of the initiator is 0.5-2% of the total mass of the lithium salt, the polar organic solvent and the monomer. And Li < + > in the lithium salt is released after the type of the solvent is adjusted, so that the Li < + > transference number and the ionic conductivity are improved.

The invention provides a solid polymer electrolyte capable of working in a wide temperature range. The solid polymer electrolyte is obtained by carrying out in-situ polymerization on a precursor solution on the surface of a base material, wherein the precursor solution is prepared from a first type of polymeric monomer, a second type of polymeric monomer, an initiator and electrolyte salt; the first polymeric monomer is an electron donor, and the electron donor is at least one of cyclic ether and olefin monomers; the second polymeric monomer is an electron acceptor, and the electron acceptor is one or more of cyclic ester, olefin monomers and anhydride monomers. The solid polymer electrolyte keeps good mechanical performance and high ionic conductivity in a wide temperature range, and an assembled solid secondary battery has good electrical performance and cycling stability.

The invention discloses a multi-scale synergistically enhanced self-healing solid polymer electrolyte and a preparation method thereof, and belongs to the technical field of electrolyte materials. The preparation method of the electrolyte comprises the following steps: S1, adding the eight-arm star polymer, the carborane lithium salt, the neutral plastic crystal additive, the ionic liquid monomer and the crown ether functionalized boron alkene two-dimensional filler into a mixed solvent to form electrolyte slurry; s2, uniformly coating a base material with the electrolyte slurry to form a wet film, and drying the wet film; s3, transferring the dried membrane to an environment filled with inert gas, and initiating in-situ polymerization of an ionic liquid monomer by using ultraviolet irradiation to form a polyionic liquid nanofiber network; and S4, placing the membrane under a vacuum condition at a constant temperature of 120 DEG C for 5 hours to obtain the solid polymer electrolyte membrane. The solid polymer electrolyte membrane provided by the invention overcomes the problems of low ionic conductivity, low lithium ion transference number, insufficient mechanical properties, poor interface stability, narrow electrochemical window and the like of the existing solid polymer electrolyte.

The invention relates to a preparation technology of a gel polymer lithium ion battery cell electrolyte, and belongs to the field of battery preparation technologies, the preparation technology comprises the following steps: mixing methacrylate monomers and silane monomers according to a mass ratio of 3: 1-5: 1, adding 1-3% of an initiator, and carrying out prepolymerization at 60-80 DEG C for 1-3 h to prepare a prepolymer solution; mixing with a non-aqueous solvent containing lithium hexafluorophosphate according to a mass ratio of (1: 4)-(1: 6) to form a precursor mixed solution, and controlling the injection rate to be 1.5-2.5 g / Ah to a gap between a battery cell pole piece and a diaphragm; after standing for 2-4 hours at the vacuum degree of less than or equal to-0.08 MPa, curing for 3-6 hours at the temperature of 60-70 DEG C to form a gel polymer electrolyte; the wettability is improved through pole piece surface hydrophilic treatment, 1-5% of vinylene carbonate is added to optimize an SEI film, the prepolymerization temperature fluctuation is controlled to be smaller than or equal to + / -2 DEG C through microwave-assisted heating, the pressure of 0.2-0.5 MPa is applied after injection to promote uniform permeation, a polyvinylidene fluoride coating of 5-10 microns is coated after curing to enhance protection, and the interface performance is ensured through an alternating-current impedance test.

The invention relates to an in-situ curing composite positive pole piece as well as a preparation method and application thereof. The in-situ curing composite positive pole piece comprises a positive pole piece containing a positive pole material, a polymer solid electrolyte forming a net-shaped through channel in pores of the positive pole material, and a polymer solid electrolyte forming a polymer solid electrolyte layer on the surface of the positive pole material, the polymer solid electrolyte is obtained through in-situ polymerization reaction of an oxidation-resistant polymer monomer; more than 70% of pores in the positive electrode material are filled with the polymer solid electrolyte, and 100% of the surface of the positive electrode material is uniformly covered with the polymer solid electrolyte. According to the in-situ curing composite positive pole piece disclosed by the invention, the polymer solid electrolyte formed by in-situ initiating the polymerization of the oxidation-resistant polymer monomer is arranged in the pole piece and on the surface of the pole piece, so that good contact between the polymer electrolyte and a high-voltage positive pole can be realized, and good high-voltage stability is also realized.

The invention provides a preparation method of a high interface strain polymer electrolyte for a lithium metal battery, and belongs to the technical field of lithium metal batteries, and the preparation method specifically comprises the following steps: firstly preparing a precursor solution A containing a lithium salt and an organic solvent, then preparing a precursor solution B obtained by mixing a polymer monomer, an initiator, a cross-linking agent and the lithium salt, mixing the precursor solution A and the precursor solution B, and carrying out vacuum drying to obtain the high interface strain polymer electrolyte for the lithium metal battery. And assembling a lithium metal battery by using the polymer as an electrolyte, and drying to obtain the high interface strain polymer electrolyte which is formed in situ in the positive and negative electrode interfaces of the lithium metal battery. By designing the proportion of fluorine element and oxygen element in a polymer electrolyte chain segment, the coordination strength of Li-O in a polymer electrolyte body phase is reduced, and the interface volume deformation during polymer lithium ion removal is improved, so that the potential difference of an electrolyte / lithium metal interface is reduced, the interface lithium deposition is homogenized, and the lithium dendrite growth is inhibited; and the cycling stability of the lithium metal battery is finally improved.

The invention provides a lignin-based flame-retardant bacterial cellulose gel polymer electrolyte, preparation and application, the lignin-based flame-retardant bacterial cellulose gel polymer electrolyte is prepared by compounding a modified lignin material, a composite lithium salt and bacterial cellulose, when the polymer electrolyte is greater than or equal to 700 DEG C, the carbon residue rate is greater than or equal to 49.52%, the heat release rate peak value is less than or equal to 61.12 kW m <-2 >, and the flame-retardant bacterial cellulose gel polymer electrolyte has a good flame-retardant effect. The smoke release rate peak value is less than or equal to 0.0089 m < 2 > s <-1 >, and T5 is greater than or equal to 246.9 DEG C. Under the condition of room temperature, the ionic conductivity of the gel polymer electrolyte is 2.37-5mS cm <-1 >, the lithium ion transference number is greater than or equal to 0.75, and the electrochemical window is greater than or equal to 4.87 V (vs Li < + > / Li); in addition, when the temperature is less than or equal to-20 DEG C, the ionic conductivity is more than or equal to 0.162 mS cm <-1 >. The lignin-based flame-retardant bacterial cellulose gel polymer electrolyte not only has an excellent flame-retardant effect, but also has relatively good electrochemical performance.

The invention provides a gel electrolyte membrane for a lithium-sulfur battery, the gel electrolyte membrane comprises a base membrane and a polymer electrolyte cured based on the base membrane, and the polymer electrolyte comprises the following raw materials: a halogenated amide additive, a monomer containing unsaturated carbon-carbon double bonds and disulfide bonds, an ether solvent, a lithium salt and an initiator. The gel electrolyte membrane provided by the invention can prevent the consumption of positive and negative active substances while inhibiting the shuttle effect of LiPSs, so that the cycle capacity and electrochemical performance of the lithium-sulfur battery are improved.

The invention relates to the technical field of polymer electrolyte, in particular to a self-repairing type gel polymer electrolyte membrane, a preparation method and application in an energy storage battery, the self-repairing type gel polymer electrolyte membrane is prepared by the following steps: dissolving amino-terminated polyethylene glycol in an organic solvent, adding trimesic acid under the protection of an inert atmosphere, heating, stirring and reacting to form a pre-polymerized solution, cooling, and then adding trimesic acid into the pre-polymerized solution to prepare a self-repairing type gel polymer electrolyte membrane; the preparation method comprises the following steps: adding glyoxylic acid and glacial acetic acid, carrying out a constant temperature reaction to obtain a solution A, adding LiTFSI into the solution A, carrying out ultrasonic dispersion to a homogeneous phase, pouring the obtained slurry onto a template, and carrying out a drying curing reaction to obtain the self-repairing gel polymer electrolyte membrane. A rigid aromatic cross-linking agent is used for inhibiting polymer crystallization and improving mechanical integrity, an imine bond-based dynamic covalent network is introduced to realize an autonomous interface repairing function at the working temperature of the battery, and meanwhile, a polyethylene glycol ether oxygen chain is used for constructing an efficient lithium ion transmission channel; therefore, the technical boundary that the conductivity, the mechanical strength and the interface stability of the traditional GPE are difficult to collaboratively optimize is broken through.

The invention belongs to the technical field of new energy materials, and particularly relates to siloxane crosslinking modified polyether solid electrolyte and a preparation method thereof. According to the solid electrolyte, the electrophilic ring-opening polymerization reaction of a polymer monomer with an epoxy group is utilized, siloxane is used as a cross-linking agent, polyether chain structures are connected together to form a cross-linked network structure, the ionic conductivity can be increased, and the mechanical strength and the high-temperature dimensional stability can be improved; the lithium ion transference number is increased, the polarization is reduced, and the battery rate capability is improved; the oxidation stability of the electrolyte is improved; the decomposition reaction of polyether at high temperature is inhibited; the thermal stability and the flame retardant property of the polymer electrolyte are remarkably improved, so that the safety of a solid-state battery is improved.

The invention discloses an amphoteric self-supporting single-ion polymer electrolyte diaphragm as well as a preparation method and application thereof. The diaphragm is prepared by physically doping a self-supporting single-ion polymer with an amphoteric ionic compound. The polymer electrolyte provided by the invention has a high-molecular polymer structure, negative ions of the polymer electrolyte are relatively fixed in an electrochemical reaction process, and single-ion conduction of lithium ions can be realized, so that uniform deposition of the lithium ions on the surface of a negative electrode is realized, and formation of lithium dendrites is inhibited. Meanwhile, the doped zwitter-ions can increase the dielectric constant of the electrolyte, so that the overall lithium ion conductivity of the electrolyte diaphragm is improved, all the components of the diaphragm are electrolyte components, an additional binder does not need to be added, and the self-supporting electrolyte diaphragm with qualified mechanical properties can be prepared.

The invention relates to the technical field of battery electrolytes, in particular to a flame-retardant solid polymer electrolyte and a preparation method and application thereof and a gel polymer electrolyte.The preparation method comprises the steps that a lithium salt, a polymer monomer, a cross-linking agent, an initiator, an additive and an organic solvent are mixed, heated and stirred to be uniform, and a precursor is obtained; and introducing a catalyst into the precursor to polymerize and cure the precursor to obtain the solid polymer electrolyte. The solid polymer electrolyte prepared by the invention has extremely strong flame retardant property; a unique cross-linked structure enhances the mechanical strength, and destroys the regularity of a polyether chain segment, so that the polyether chain segment is in an amorphous state, and therefore, the polyether chain segment has high ionic conductivity; due to the introduction of bicyclic carbonate, the oxidation stability is enhanced, high stability is shown on a high-voltage positive electrode, and the lithium ion transference number of the electrolyte is also increased to a certain extent; and finally, the assembled battery shows excellent cycling stability and rate capability.

The invention discloses a solid-state lithium battery and a preparation method thereof and belongs to the technical field of battery processing. The preparation method of the solid-state lithium battery comprises the following steps: S1, assembling a positive plate, a diaphragm and a negative plate into a dry cell; wherein a composite film layer is cured on a current collector base material of the negative plate, and rubidium nitrate is added into the composite film layer; s2, injecting the gel precursor solution into a dry battery cell, fully standing, and charging the battery cell to 100% SOC; wherein the gel precursor solution contains an electrolyte, a cross-linking agent and an initiator; and S3, heating to initiate a chemical cross-linking reaction of a cross-linking agent in the gel precursor solution, and carrying out in-situ polymerization and curing on the surface of each component of the dry cell and in internal pores thereof to obtain a gel polymer electrolyte, thereby forming the solid-state lithium battery. According to the invention, the interface resistance can be reduced, and the lithium ion transmission capability and efficiency are improved.

The invention discloses a polymer electrolyte, a preparation method and application. The polymer electrolyte provided by the invention comprises a polymer elastomer and a multi-element deep eutectic electrolyte, the multi-element deep eutectic electrolyte comprises a lithium salt, a hydrogen bond donor and an additive containing O = S = O groups, and the molar ratio of the lithium salt to the hydrogen bond donor to the additive containing the O = S = O groups is (5-20): (60-90): (2-20). The polymer electrolyte provided by the invention has good rate capability at room temperature and good charge-discharge cycle performance in a wide temperature range of-60 DEG C to 120 DEG C, and can be matched with a positive electrode material with higher working voltage, so that the energy density of a battery is remarkably improved.

The lithium secondary battery comprises a positive electrode, a negative electrode, a diaphragm and a polymer electrolyte, the polymer electrolyte contains the flame-retardant microcapsule, the flame-retardant microcapsule has a core-shell structure, a copolymer material containing one or more of an amide group, an ester group and an ether group is taken as a shell layer, and a flame retardant is taken as a core; the rupture collapse temperature of the flame-retardant microcapsule shell material is 60-120 DEG C, the melting point of the flame retardant is 20-120 DEG C, and the rupture collapse temperature of the copolymer material is higher than the melting point of the flame retardant. The lithium secondary battery disclosed by the invention has excellent flame retardance, the flame-retardant microcapsule added in the lithium secondary battery can be broken and collapsed when the battery is in thermal runaway, and the flame retardant is quickly released, so that the thermal runaway is actively defended in advance from the interior of the battery, and the electrochemical performance of the battery is not reduced.

The invention discloses a preparation method of an intrinsically safe polymer electrolyte and a solid-state battery thereof, and belongs to the field of preparation of solid-state lithium metal batteries. The solid polymer electrolyte is of a 1M (xA + yB) + (z1C + z2D) type, x accounts for 14-15 wt%, y accounts for 1-2 wt%, z1 accounts for 70-72 wt%, z2 accounts for 11-12 wt%, A and B are lithium salts, C is a fluorine-containing monomer, D is a cross-linking agent, the fluorine-rich monomer, the cross-linking agent and the lithium salts are mixed, no electrolyte is added, an in-situ thermal polymerization method is adopted to prepare the intrinsic safe solid polymer electrolyte with high safety and high voltage resistance, and meanwhile, the electrolyte is of a three-dimensional chain network structure. Therefore, the safety performance of the electrolyte is effectively enhanced, the migration activation energy of lithium ions is reduced, and the ionic conductivity is improved. The core problems that an existing traditional battery is poor in safety performance, poor in high-voltage tolerance, large in interface impedance, out-of-control in lithium dendrite growth and the like are solved.

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

The invention provides a polymer electrolyte with high interface stability and a preparation method and application thereof. The polymer electrolyte comprises a polymer matrix, a porous support material, a lithium salt, a solvent and an initiator. The polymer matrix is formed by in-situ copolymerization of a methacrylate polymer monomer as a rigid skeleton monomer and a methacrylate polymer monomer with a functional group as a functional monomer. The polymer electrolyte prepared by an in-situ curing method has high room-temperature ionic conductivity, a wide electrochemical window (gt; 5.3 V) and excellent cycling stability. The functional monomer is helpful for forming a high-stability SEI film rich in inorganic components on a positive electrode and a lithium metal / electrolyte interface, the stability of the electrode / electrolyte interface is improved, and the growth of lithium dendrites is inhibited, so that the mechanical property and the safety performance are improved. The polymer electrolyte can be widely applied to battery systems such as high-voltage lithium ion batteries, high-specific-energy lithium ion batteries and high-safety lithium ion batteries.

The present invention relates to the technical field of lithium ion battery manufacturing, and in particular to an in-situ gel polymer electrolyte and its preparation method and application. It includes: dissolving lithium salt in a mixed organic solvent of 1,3-dioxolane and carbonate organic matter, stirring and mixing evenly under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm; dissolving additives in an electrolyte, stirring under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm; adding an initiator, stirring under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm to obtain an in-situ gel polymer electrolyte. The advantages are: the initiator triggers the in-situ polymerization of 1,3-dioxolane, forms a gel polymer electrolyte in situ in the battery, improves the compatibility of the interface, and reduces the battery impedance; forms a stable interface film, improves the stability of the electrode interface, and improves the room temperature rate performance and low temperature performance of the battery.