2860results about "Electrolyte immobilisation/gelification" patented technology

The invention relates to the technical field of solid-state lithium batteries, in particular to a cellulose acetate modified PEO-based solid-state electrolyte membrane, a solid-state lithium battery and a preparation method thereof.The preparation method comprises the steps that lithium bis (trifluoromethanesulfonyl) imide, cellulose acetate and polyethylene oxide are dissolved in a solvent, and a mixed solution is obtained; and curing the mixed solution in a mold to obtain the cellulose acetate modified PEO-based solid electrolyte membrane. According to the invention, the cellulose acetate is introduced to modify the polyethylene oxide solid electrolyte, and the prepared cellulose acetate modified PEO-based solid electrolyte membrane can generate a stable solid electrolyte interface rich in Li2O and LiF on the surface of a lithium negative electrode in situ in the application of a solid lithium battery, so that the growth ability of lithium dendrites is effectively inhibited, and the performance of the lithium battery is improved. The interface impedance is reduced, and the operating temperature range of the solid-state lithium battery is widened.

Embodiments described herein relate generally to electrochemical cells including a selectively permeable membrane and systems and methods for manufacturing the same. In some embodiments, the selectively permeable membrane can include a solid-state electrolyte material. In some embodiments, electrochemical cells can include a cathode disposed on a cathode current collector, an anode disposed on an anode current collector, and the selectively permeable membrane disposed therebetween. In some embodiments, the cathode and / or anode can include a slurry of an active material and a conductive material in a liquid electrolyte. In some embodiments, a catholyte can be different from an anolyte. In some embodiments, the catholyte can be optimized to improve the redox electrochemistry of the cathode and the anolyte can be optimized to improve the redox electrochemistry of the anode. In some embodiments, the selectively permeable membrane can be configured to isolate the catholyte from the anolyte.

Embodiments described herein relate generally to electrochemical cells having semi-solid electrodes that include a gel polymer additive such that the electrodes demonstrate longer cycle life while significantly retaining the electronic performance of the electrodes and the electrochemical cells formed therefrom. In some embodiments, a semi-solid electrode can include about 20% to about 75% by volume of an active material, about 0.5% to about 25% by volume of a conductive material, and about 20% to about 70% by volume of an electrolyte. The electrolyte further includes about 0.01% to about 1.5% by weight of a polymer additive. In some embodiments, the electrolyte can include about 0.1% to about 0.7% of the polymer additive.

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

The invention provides a preparation method of a gel semi-solid battery and the gel semi-solid battery, and belongs to the technical field of battery materials. The preparation method comprises the following steps: pre-mixing a gel monomer into a positive pole piece and a negative pole piece by adopting a dry electrode technology, then assembling the positive pole piece, the negative pole piece and a diaphragm into a dry battery cell, injecting a gel electrolyte prepolymer prepared from the gel monomer, an electrolyte, an initiator and the like into the dry battery cell, and standing and infiltrating; and heating and carrying out in-situ polymerization curing to obtain the gel semi-solid battery. According to the preparation method, a dry-method electrode technology and an in-situ curing technology are combined, on one hand, the curing uniformity of the gel electrolyte prepolymer is improved, on the other hand, it can be guaranteed that the cured gel electrolyte prepolymer makes closer contact with active material particles, the conductivity of gel and the active material is improved, and the conductivity of the active material is improved. Therefore, the overall electrical performance of the semi-solid battery is improved. The invention also provides a gel semi-solid battery which is prepared by the preparation method.

The invention provides a double-layer polymer solid electrolyte, a preparation method thereof and a lithium ion battery, and belongs to the technical field of solid electrolyte manufacturing. The first polymer solid electrolyte layer comprises the following raw materials in parts by weight: 4-30 parts of a first reactive monomer A, 5-25 parts of a first reactive monomer B, a first cross-linking agent, a first photoinitiator, a first lithium salt, 1-20 parts of a first carbonic ester plasticizer and 20-45 parts of a nitrile plasticizer; the second polymer solid electrolyte layer comprises the following raw materials in parts by weight: 4-30 parts of a second reactive monomer A, 5-25 parts of a second reactive monomer B, a second cross-linking agent, a second photoinitiator, a second lithium salt, 1-35 parts of a second carbonic ester plasticizer and 10-35 parts of a fluorine-containing plasticizer; the double-layer polymer solid electrolyte has the advantages of relatively high ionic conductivity and compatibility of a high-voltage battery positive electrode and a low-voltage lithium metal negative electrode, so that the corresponding battery has relatively excellent cycle performance and relatively high capacity.

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 discloses a solid electrolyte membrane and a preparation method and application thereof. The solid electrolyte membrane comprises a first electrolyte close to the positive pole piece and a second electrolyte layer close to the negative pole piece. The first electrolyte layer comprises a polymer, a lithium salt and an additive, and the second electrolyte layer comprises a solid electrolyte, a polymer, a lithium salt and an additive. The first electrolyte layer has a wide electrochemical window and relatively high mechanical properties, and can be matched with a high-voltage positive electrode material and improve solid-solid interface contact. The solid electrolyte of the second electrolyte layer is mainly composed of a continuous vertical array micro-mesoporous material, has a micro-mesoporous structure and high surface adsorption energy, and can accelerate lithium salt dissociation, reduce molecular interaction between polymer chains, form a three-dimensional continuous fast ion transmission channel and a heat conduction network, and improve ionic conductivity and safety performance. The solid electrolyte membrane disclosed by the invention has excellent ionic conductivity, wide electrochemical window, high safety performance and excellent electrochemical performance.

The invention discloses a preparation method of a lithium-phosphorus-sulfur-bromine solid-state electrolyte, and relates to the technical field of solid-state lithium batteries. The material is subjected to raw material pretreatment, mechanochemical ball milling, high-temperature crystallization treatment and post-treatment processes, so that the solid electrolyte with high crystallinity, high ionic conductivity and good processability is obtained. According to the method, dynamic bromine atmosphere control is adopted, sulfur partial pressure adjustment and particle size gradient design are combined, and the structural stability and the ion transmission performance of the material are improved.

The invention discloses a preparation method and application of a sulfide solid electrolyte membrane based on a gradient polymer / ionic liquid composite binder, and an all-solid-state battery, and belongs to the technical field of all-solid-state batteries. The method comprises the following steps: firstly coating a polymer / ionic liquid / sulfide electrolyte composite layer through a gradient coating process, filling particle gaps under low pressure by utilizing the plasticizing effect of ionic liquid, and reducing the porosity of an interface; and then coating a polymer / sulfide electrolyte surface layer to provide mechanical support and inhibit side reaction of the electrode. According to the design, the electrolyte membrane still keeps high ionic conductivity under the working pressure of a commercial power battery module, and the interface impedance is reduced compared with that of a traditional homogeneous membrane. Through the innovative gradient structure and material combination, the ion transmission bottleneck of the sulfide electrolyte under the low-pressure condition is solved, excellent interface stability and process compatibility are achieved, and a key technical scheme is provided for all-solid-state battery industrialization.

The invention belongs to the technical field of solid-state electrolytes, and particularly discloses a modified PEO-based composite solid-state electrolyte, a preparation method thereof and a solid-state battery. The modified PEO-based composite solid electrolyte comprises the following components: lithium-doped indium gallium phosphate, PEO and a lithium-based electrolyte, wherein the chemical formula of the lithium-doped indium gallium phosphate is InxGa (1-x) PO4: Li, and x is more than or equal to 0.3 and less than or equal to 0.8. The indium gallium phosphate has an amorphous structure and shows excellent lithium ion transmission performance and conductivity; after lithium ions are further embedded into the indium gallium phosphate with the amorphous structure, the lithium ion conductivity of the indium gallium phosphate can be further improved, and more active sites are provided for transmission of the lithium ions; the lithium-doped indium gallium phosphate is added into the PEO-based solid electrolyte as an inorganic filler, so that the mechanical strength, the ion transmission capability and the conductivity of the PEO-based solid electrolyte can be effectively improved.

A solid electrolyte material and a preparation method therefor, a solid electrolyte, a semi-solid electrolyte, a positive electrode, and a battery. The solid electrolyte material comprises a compound represented by the following general formula: Aa(M1bM2c)Xd, wherein A comprises one or more of Li, Na, K, Cu and Ag, X is halogen, M1 is a main element, M1 is selected from among one of Ga, Y, In, Mg, Sr, Sc, Al, Fe, Zr, Hf, Ta, Nb, W, Mn, Zn, Co, Mo, Sn, Ca, Pb, Ti, Ru and a lanthanide metal element, M2 is a doping element, M2 comprises one or more elements of groups IIA, IIB, IIIA, IIIB, IVA, IVB, VA and VB, b is greater than the molar ratio of any element in M2, 0.5≤a≤5, 0.2≤b≤2, 0.2≤c≤2, d=a*ε1+b*ε2+c*ε3, ε1 is the weighted average valence of A, ε2 is the weighted average valence of M1, and ε3 is the weighted average valence of M2.

The invention relates to the technical field of batteries, in particular to a solid electrolyte, a battery containing the solid electrolyte and a preparation method of the solid electrolyte. Wherein the solid electrolyte is prepared from an electrolyte precursor through a thermally initiated in-situ polymerization process; the electrolyte precursor comprises cellulose, a polymer monomer, a lithium salt, a plasticizer, an additive and a thermal initiator; according to the invention, cellulose is dissolved in a solid electrolyte precursor and is uniformly compounded with the diaphragm during in-situ polymerization, so that the thermal shrinkage resistance of the diaphragm and the overall safety of the battery are improved; compared with a process for improving the safety by using cellulose on the diaphragm side, the method has the advantages that the diaphragm does not need to be subjected to any additional treatment, the thickness of the diaphragm is not increased, and the prepared battery is good in comprehensiveness and low in cost; in the preparation process of the battery, the cellulose-containing solid electrolyte and the diaphragm are compounded to form a solid electrolyte-diaphragm compound with high mechanical strength and high thermal stability, so that the resistance of the battery to thermal runaway is improved.

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 provides a composite solid electrolyte and a preparation method thereof, and belongs to the technical field of solid electrolyte materials. The solid electrolyte powder, the photosensitive resin monomer, the lithium salt, the plasticizer and the photoinitiator are used as raw materials to prepare the composite solid electrolyte, the plasticizer can be inserted between polymer chains, the compatibility of the solid electrolyte powder and a polymer is improved, electrode interface contact is improved, the flexibility of the composite solid electrolyte is improved, and the service life of the composite solid electrolyte is prolonged. The ionic conductivity of the composite solid electrolyte is further improved; the photosensitive resin monomer and the photoinitiator can be subjected to photopolymerization in-situ curing, so that the composite solid electrolyte has better mechanical property and flexibility, electrode interface contact is improved, and the ion conductivity is improved.

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

The invention discloses a deep eutectic gel electrolyte as well as a preparation method and application thereof, and belongs to the field of battery materials. The deep eutectic gel electrolyte is prepared from the polymerizable deep eutectic solvent and an initiator. Wherein the polymerizable deep eutectic solvent is obtained by mixing and heating the following independently stored components: a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is a metal salt; the hydrogen bond donor is butanedinitrile and a polymerizable monomer. The preparation method of the deep eutectic gel electrolyte comprises the following steps: mixing the raw materials under a certain temperature condition, fully stirring to obtain a gel electrolyte precursor solution, and initiating polymerization under an illumination condition to obtain the deep eutectic gel electrolyte. The gel electrolyte prepared by the method has relatively high ionic conductivity and a relatively wide electrochemical stability window, and the cycle life of a symmetric battery and a total battery assembled by the deep eutectic gel electrolyte is obviously prolonged. Meanwhile, the quasi-solid-state sodium-ion battery and the lithium-ion battery prepared by the method are simple in technological process, and commercial production is easy to realize.

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 discloses a high-entropy NASICON type solid electrolyte and a preparation method thereof. According to the electrolyte, on the basis of Na3Zr2Si2PO12, five or more metal elements # imgabs0 # and # imgabs1 # with different valence states and different functions are doped at Zr sites through a solid-phase sintering method to obtain high-entropy # imgabs2 #, and the high-entropy # imgabs2 # can be further subjected to ion exchange to obtain # imgabs3 #; the regulation and control on the carrier (A = Na / Li) concentration, A-O bond energy and A + migration energy barriers can be realized while the lattice freedom degree of the electrolyte is improved, so that higher room-temperature conductivity is obtained while the electrochemical stability of the electrolyte is ensured.

The invention relates to the technical field of solid-state battery energy conversion, and discloses a high-safety sodium-ion battery energy conversion method based on a solid-state electrolyte, which comprises the following steps: identifying an interface dynamic mismatch risk time period in a charging and discharging process, and applying micro-amplitude high-frequency acoustic vibration disturbance to a solid-state electrolyte and a sodium negative electrode interface in the time period, sodium ion microscopic distribution is regulated and controlled through the acoustic streaming effect, contact stress is dredged, dendritic crystal early nucleation is inhibited, dynamic reconstruction and optimization of the interface state are achieved, the solid-state sodium-electricity interface is converted into dynamic self-adaption from static mismatch, the ion transmission uniformity is actively maintained through the acoustic streaming effect, and dynamic reconstruction and optimization of the interface state are achieved. And meanwhile, real-time sensing of an interface state and dynamic adjustment of acoustic vibration parameters are realized in combination with an acoustic probing mechanism, so that the interface stability and dendritic crystal inhibition capability are effectively improved, and the energy conversion efficiency and the safety performance of the battery are remarkably enhanced.

The invention provides a bipolar battery and an electric device. The bipolar battery comprises n stacked bipolar electrodes, wherein n is greater than 1; each bipolar electrode comprises a current collector, a positive electrode and a negative electrode; the positive electrode film layer is arranged on one side of the current collector, the side, provided with the positive electrode film layer, of the current collector is a positive electrode side, and the side, opposite to the positive electrode side, of the current collector is a negative electrode side; and a negative electrode film layer or a conductive layer is optionally arranged on the negative electrode side.

The invention discloses a semi-solid-state lithium ion battery and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the preparation method of the semi-solid-state lithium ion battery disclosed by the invention comprises the following steps: injecting a semi-solid-state electrolyte into a dry battery in two times, and curing for two times, so that the semi-solid-state electrolyte is partially cured and then is transited to be completely cured, thereby obtaining the semi-solid-state lithium ion battery. The gelation process of the semi-solid electrolyte is controllable, and the curing reaction is more uniform; and meanwhile, formation and curing are completed at the same time, gas generated in the formation process can be discharged, the problem of lithium precipitation caused by a large number of bubble mark residues due to the fact that battery interface bubble holes cannot be closed after curing is solved, and the uniformity of an electrode interface is improved.

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

The invention relates to a composite solid electrolyte and a preparation method and application thereof. The preparation method of the composite solid electrolyte comprises the following steps: S1, mixing an inorganic filler and a fluorine-containing compound, and reacting at 70-90 DEG C under an acidic condition to obtain an inorganic filler wrapped by a fluorinated layer; then adding a fluorine ion complexing agent and a silane coupling agent for reaction to obtain a modified filler; adding a thermal decomposition type cross-linking agent into the polymer, and carrying out melt blending to obtain a cross-linked polymer; s2, uniformly mixing the modified filler, a cross-linked polymer, a lithium salt and a solvent to obtain a plurality of slurries containing the modified filler with different volume concentrations; and molding the slurry to prepare the composite solid electrolyte. According to the method, the fluorinated layer and the siloxane network are constructed step by step, so that the interface impedance is reduced, and efficient dissociation of the lithium salt is promoted; a three-dimensional network structure is combined, so that the tensile strength is improved; the modified filler is further designed in a gradient manner to improve the lithium ion transference number.

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 relates to the technical field of lithium battery diaphragms, and discloses a water-soluble gel electrolyte, a preparation method thereof, water-based slurry and application. The preparation method of the water-soluble gel electrolyte comprises the following steps: in the presence of an initiator, carrying out first polymerization reaction on methyl methacrylate and N-isopropylacrylamide to obtain an intermediate I; carrying out second polymerization reaction on the polymer solution A and the polymer solution B to obtain an intermediate I; the polymer solution A contains an intermediate I with the concentration of 8-12wt%; the polymer solution B contains neopentyl glycol diglycidyl ether with the concentration of 0.5 to 1.2 weight percent; and carrying out heating treatment on the intermediate I to obtain the water-soluble gel electrolyte. When the water-soluble gel electrolyte is applied to the battery diaphragm, the addition amount of the electrolyte can be reduced during electrolyte injection in a battery cell, and the cost is effectively reduced; battery leakage is reduced, and the safety performance of the battery cell is improved; and the internal resistance can be reduced, and the cycle performance of the battery cell can be improved.

The invention discloses application of metal phthalocyanine in polymer solid electrolyte and an all-solid-state lithium / sodium battery. Metal phthalocyanine is adopted to prepare a PVDF-based polymer solid electrolyte, and then the PVDF-based polymer solid electrolyte is used as a positive electrode component to be used in a polymer all-solid-state sodium battery, or metal phthalocyanine is adopted to prepare a PEO-based polymer solid electrolyte, and then the PEO-based polymer solid electrolyte is used as a negative electrode component to be used in an all-solid-state lithium battery. And the preparation of the high-performance polymer all-solid-state lithium / sodium battery at room temperature can be realized. A metal phthalocyanine network with a plane pi-conjugated structure is introduced into a PVDF or PEO matrix, metal in metal phthalocyanine is Zn, Co or Fe, preparation of the all-solid-state sodium / lithium metal battery is achieved, and the prepared all-solid-state sodium / lithium metal battery has high cycling stability.

The invention provides a semi-solid-state battery electrolyte precursor, a semi-solid-state battery electrolyte, a semi-solid-state battery and a preparation method of the semi-solid-state battery. The electrolyte precursor comprises a first polymer monomer, a second polymer monomer and an initiator, the first polymer monomer is an acrylic monomer or an acrylate monomer; the second polymer monomer is a fluorine-containing unsaturated monomer. According to the semi-solid battery electrolyte precursor, the first polymer monomer with the acrylic acid or acrylate structure and the second polymer monomer with the fluorine-containing unsaturated structure are selected, the formed copolymer can improve the stability of an electrode / electrolyte interface, and even if monomer residues exist, the stability of the electrode / electrolyte interface can be improved. And an SEI film with good stability can also be formed in a subsequent film forming stage, and an electrode / electrolyte interface is optimized.

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 belongs to the technical field of new energy materials and devices, and relates to a gel electrolyte, a preparation method and a solid-state lithium battery, a liquid novel initiator with a low freezing point, a cyclic ether polymeric monomer and a plasticizer are mixed to form a homogeneous precursor solution, the precursor solution is injected into a battery shell, standing is performed at normal temperature (20-35 DEG C) for in-situ polymerization, and the solid-state lithium battery is obtained. And the gel electrolyte-based solid-state battery can be obtained. The gel electrolyte is initiated by a novel initiator, and compared with a common initiator, the gel electrolyte has better low-temperature performance, and a high-performance solid-state lithium battery is formed.