2419 results about "Polymer electrolytes" patented technology

The invention belongs to the technical field of battery electrolytes, and particularly relates to a gel polymer electrolyte as well as a preparation method and application thereof. The gel polymer electrolyte is prepared through in-situ polymerization, and the electrolyte is composed of a monomer, a cross-linking agent, an initiator, an organic solvent and a lithium salt. The monomer is selected from fluorine-containing monomers such as trifluoroethyl acrylate, 2, 2, 3, 3-tetrafluoropropyl methacrylate and the like, and the cross-linking agent is selected from NH-containing cross-linking agents such as N, N '-methylene bisacrylamide, hexamethylene bisacrylamide and the like, so that a polymer side chain fluorine-containing functional group is formed in situ and interacts with lithium ions, and lithium ion transmission is promoted; and the NH functional group on the main chain limits the migration of anions, so that the ion migration number is increased. Therefore, the copolymerized fluorine-containing monomer and nitrogen-containing cross-linking agent gel polymer electrolyte enables the battery to show good specific discharge capacity and cycling stability under high current density.

The invention relates to the production of a plate arrangement (2) of a stack (1) of electrochemical cells (3), wherein plates arranged parallel to one another are additively produced in planes which are oriented perpendicular to the plates. The invention further relates to an electrochemical cell (3), in particular an electrochemical system in the form of an electrolyzer, with a cell stack (1) comprising two end plates (28, 29), between which at least one such plate arrangement (2) and at least two polymer electrolyte membranes (34, 34') are arranged.

Multi-functional composite particulates for a lithium battery, wherein at least one of the composite particulates has a diameter from 100 nm to 50 μm and comprises (a) a polymer electrolyte, comprising from 0.1% to 50% by weight of a lithium salt dissolved or dispersed in the polymer electrolyte; (b) a plurality of primary particles of an anode or cathode active material that are encapsulated by, embedded in, dispersed in, or bonded by the polymer electrolyte having a lithium ion conductivity from 10−8 to 5×10−2 S / cm, wherein the primary particles occupy a weight fraction from 5% to 98%; (c) particles of an inorganic material occupying a weight fraction from 0% to 30% (preferably from 0.1% to 20%); and (d) an electron-conducting additive having a weight fraction of 0% to 30% (preferably from 0.1% to 20%) based on the total weight of the composite particulate.

The invention relates to the technical field of solid-state batteries, in particular to a solid-state electrolyte composite membrane, a preparation method thereof and a solid-state battery. The preparation method comprises the following steps: performing ultrasonic-initiated cross-linking polymerization on a polymer solid electrolyte monomer, a cross-linking agent and a surface hydroxylated oxide solid electrolyte to obtain a polymer-oxide solid electrolyte matrix, washing the polymer-oxide solid electrolyte matrix, and soaking the polymer-oxide solid electrolyte matrix in an electrolyte to obtain the solid electrolyte composite membrane. According to the invention, crosslinking of the polymer electrolyte monomer is initiated by ultrasound, and chemical bonds are formed between part of the polymer electrolyte monomer and the surface-hydroxylated oxide solid electrolyte, so that the interfacial compatibility of the polymer electrolyte monomer and the surface-hydroxylated oxide solid electrolyte is effectively improved, and the ionic conductivity, chemical stability and mechanical strength of the polymer electrolyte are improved; due to the properties of easy processing, good flexibility and the like of the polymer electrolyte, the interface compatibility between the oxide solid electrolyte and the positive and negative pole pieces can be fully improved, the flexibility and the processability are improved, and a win-win effect is achieved.

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 belongs to the field of polymer electrolyte membranes, and particularly relates to a benzimidazole micromolecule-based proton exchange composite membrane for electrolyzing water and a preparation method thereof. The preparation method comprises the following steps: firstly synthesizing 5, 5 '-bis [2-(2-hydroxy-5-sulfophenyl) benzimidazole], then synthesizing sulfonated polyetheretherketone, and finally preparing the proton exchange composite membrane based on benzimidazole micromolecules. The benzimidazole rigid rod-like micromolecules with sulfonic acid groups are designed and prepared by utilizing the advantages of heat resistance, acid resistance, alkali resistance and better dissolvability than PBI of the benzimidazole micromolecules, and the benzimidazole rigid rod-like micromolecules are added into a polymer matrix as a filler to prepare the composite membrane, so that the proton conductivity, the swelling resistance and the oxidation stability of the original polymer membrane are improved.

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 present disclosure relates to polymers synthesized from ionomers having an aromatic hydrocarbon-containing backbone and an amine-containing ionic or ionizable moiety with polystyrene. The linkage between the ionomer and the polystyrene is made through covalent bonds or linking moieties. Electrochemical cells having polymer electrolyte membranes composed of the combined polymers are also described.

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.

An elongate, flexible, medical device having distal and proximal ends, including an inner member having a proximal and distal end, a support member extending around the inner member between the proximal and distal end, a plurality of electrically-conductive wires, each braided with the support member having a proximal and distal end, an outer member surrounding the inner member, the support member, and the plurality of electrically-conductive wires and an actuator including a polymer electrolyte layer secured adjacent to the distal end of the elongate, flexible inner member and defining an exterior surface, electrodes distributed about the exterior of the polymer electrolyte layer. The distal end of one of the electrically-conductive wires is electrically connected to one of the electrodes. The polymer electrolyte layer is configured to deform asymmetrically in response to the application of an electrical signal through the plurality of electrically-conductive wires to the plurality of electrodes.

The present invention relates to a gel polymer electrolyte membrane and a preparation method therefor, and a secondary battery. The gel polymer electrolyte membrane comprises an ionic liquid and a polyionic liquid obtained by polymerizing the ionic liquid. Further provided is a gel polymer electrolyte membrane having both a high ionic conductivity and high mechanical properties.

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.

A solid secondary battery includes a cathode layer, an anode layer, and a solid electrolyte layer between the cathode layer and the anode layer and further includes a first organic electrolyte between the cathode layer and the solid electrolyte layer, a second organic electrolyte between the anode layer and the solid electrolyte layer, a third organic electrolyte in the solid electrolyte layer, or any combination thereof, wherein the first organic electrolyte, the second organic electrolyte, and the third organic electrolyte each independently include a polymer electrolyte, a liquid electrolyte, or any combination thereof, the liquid electrolyte having a viscosity of 10 cps or more at 25 °C and 1 atm, wherein the cathode layer includes a cathode current collector and a cathode active material layer on at least one surface of the cathode current collector, the cathode active material layer including a Li2S-containing composite.

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 polyurethane-based solid electrolyte as well as a preparation method and application thereof. The polyurethane-based solid electrolyte comprises a metal organic framework three-dimensional skeleton film and a composite polyurethane layer attached to the surface of the metal organic framework three-dimensional skeleton film, the metal organic framework three-dimensional framework film is metal organic framework modified glass fiber cloth; the composite polyurethane layer comprises polyurethane and metal organic framework particles embedded in a macromolecular network of the polyurethane in situ; a carbamate group of polyurethane and a three-dimensional skeleton of the metal organic framework form a hydrogen-bond interaction, so that the ion transmission performance and the mechanical performance are synergistically improved. The polyurethane-based solid electrolyte provided by the invention can promote lithium salt dissociation, inhibit anion migration, improve the ionic conductivity and the ionic transference number, and improve the charge-discharge stability; a large number of repetitive unit carbamate groups in polyurethane and a three-dimensional skeleton form hydrogen-bond interaction to synergistically promote rapid transmission of lithium ions, so that the transference number of the polymer electrolyte is increased, and the ion transmission performance and the mechanical performance are improved.

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 relates to production of a plate assembly (2) of a stack (1) of electrochemical cells (3), wherein plates arranged parallel to one another are additively manufactured in planes oriented perpendicularly to the plates. The invention also relates to an electrochemical cell (3), in particular an electrochemical system in the form of an electrolyzer, with a cell stack (1) comprising two end plates (28, 29), between which at least one such plate assembly (2) and at least two polymer electrolyte membranes (34, 34') are arranged.

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 present invention relates to a polymer solid electrolyte diaphragm with a multilayer structure and a preparation method and application thereof. The diaphragm structure is a multilayer structure of polymer layer / skeleton material layer / polymer layer, wherein the skeleton material layer is mainly a skeleton material and is also infiltrated by the polymer layer; the polymer layer is a polymer material with lithium ion conductivity. In the multilayer structure of the present invention, a small amount of liquid electrolyte remaining in the rich gaps of the metal-organic framework material tightly arranged in the skeleton material layer forms a liquid film, which can provide a liquid transmission channel when the solid electrolyte diaphragm transmits lithium ions, improve the lithium ion transmission rate and lithium ion migration number of the electrolyte diaphragm, and at the same time, the good mechanical strength and thermal stability of the fiber cross-linking structure can improve the mechanical properties and flame retardant properties of the polymer electrolyte diaphragm. The obtained lithium metal battery and lithium ion battery have a longer cycle life and a higher specific capacity. At the same time, the process of the present invention is simple and easy to operate, and is suitable for industrial production.

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.