765results about "Electrolyte immobilisation/gelification" patented technology

The invention discloses a composite solid electrolyte and a preparation method and application thereof, and belongs to the technical field of solid lithium batteries. The composite solid electrolyte comprises a polymer matrix, a lithium salt and a lithium ion modified ionic metal organic framework (MOF) material. The metal center of the ion-conducting MOF material can be selected from Zr, Ti, Hf and the like, and the organic ligand can be selected from organic acids containing sulfydryl, sulfo groups and the like. The MOF material can effectively inhibit crystallization of a polymer matrix and increase the proportion of an amorphous region, Lewis acid sites on the surface of the MOF material can promote dissociation of lithium salt, and a lithium ion coordination channel formed in the MOF material can provide an extra rapid transmission path for lithium ions. When the electrolyte is applied to the solid-state lithium battery, the growth of lithium dendrites can be effectively inhibited, and the rate capability, the cycling stability and the safety of the battery can be remarkably improved.

The invention discloses a composite solid electrolyte layer, a preparation method and application, the composite solid electrolyte layer comprises a porous membrane laminated on a negative pole piece, and pores in the porous membrane and gaps between the porous membrane and the negative pole piece are filled with in-situ generated polymers. Inorganic solid electrolyte is also dispersed in the porous membrane, and lithium salt is dispersed in the polymer and the porous membrane. The composite solid electrolyte layer is obtained through in-situ polymerization of a polymer in pores in the porous membrane and gaps between the porous membrane and the negative electrode plate, and a novel interface structure with the electrode-electrolyte integration characteristic is constructed. By adopting a collaborative optimization strategy of a polymer matrix and inorganic filler double-crosslinking network system and an interface stable layer, the volume effect problem of a silicon-based negative electrode, the electrolyte interface impedance problem and the battery safety problem can be solved at the same time, so that the cycling stability and the rate capability of the lithium ion battery are remarkably improved.

The invention discloses a lithium ion battery, a preparation method thereof and a lithium ion battery module. The lithium ion battery comprises a positive electrode, a first solid electrolyte membrane and a negative electrode which are sequentially stacked in the thickness direction, the lithium ion battery also comprises a second solid electrolyte membrane; the second solid electrolyte membrane is positioned between the positive electrode and the first solid electrolyte membrane; wherein the second solid electrolyte membrane is provided with a plurality of first through holes, and the first through holes are filled with a positive electrode lithium supplement agent. The lithium ion battery disclosed by the invention is provided with the double-layer composite solid electrolyte membrane, and the positive electrode lithium supplementing agent is filled in the through hole formed in the solid electrolyte membrane in contact with the positive electrode, so that active lithium consumed when the lithium ion battery is charged for the first time can be effectively supplemented, the total capacity and the energy density of the lithium ion battery are improved, and the cycle life of the lithium ion battery is prolonged.

The invention discloses a preparation method of a solid-state electrolyte based on chemical bonding of a silane coupling agent and a sulfide solid-state electrolyte and a preparation method of a solid-state lithium battery. A halogen ion competitive adsorption effect of a first electrolyte is cooperated with a compact siloxane network formed by the silane coupling agent; the sulfide solid electrolyte is effectively inhibited from reacting with moisture in air, electrochemical performance attenuation is delayed, the first electrolyte reacts with lithium metal to generate a stable SEI layer to inhibit dendritic crystal growth, and a wide electrochemical stable window of the second electrolyte can reduce oxygenolysis reaction with a high-voltage positive electrode, so that the electrochemical performance is improved. Chemical bonding is formed between amino groups of the silane coupling agent and lithium metal, interface contact is optimized, meanwhile, the interface ion transfer efficiency is improved through the high ionic conductivity of the second electrolyte, and the interface impedance is reduced; the defects of poor ionic conductivity and poor service life caused by poor air stability and electrochemical stability of the electrolyte in the prior art are overcome.

The present invention provides a composition for forming a gel polymer electrolyte which includes a lithium salt; an organic solvent; and a crosslinking compound represented by Formula 1. wherein in Formula 1, L1, L2, L3, and L4 are each independently selected from a direct bond or an alkylene group having 1 to 3 carbon atoms, L5 and L6 are each independently an alkylene group having 1 to 20 carbon atoms in which at least one methylene group is optionally substituted with an ether group and at least one hydrogen is substituted with fluorine, and R1 and R2 are each independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, or a halogen.

This application relates to the field of hydrogel electrolyte technology, specifically disclosing a modified sodium alginate crosslinked hydrogel electrolyte, its preparation method, and its applications. This application reduces environmental toxicity and pollution by introducing modified sodium alginate as a crosslinking agent into the hydrogel electrolyte. The interaction between sodium alginate and zinc ions inhibits zinc dendrite formation, regulates the interfacial growth between the negative electrode and the electrolyte, and thus extends battery life; it also has a certain inhibitory effect on hydrogen evolution reaction. This application can prepare the modified sodium alginate crosslinked hydrogel electrolyte using a simple free radical polymerization method. Furthermore, compared to conventional aqueous batteries, the hydrogel electrolyte can better control the interfacial growth of the positive and negative electrodes.

The embodiment of the invention discloses a preparation method of a solid electrolyte membrane and the solid electrolyte membrane. The preparation method of the solid electrolyte membrane comprises the following steps: providing a composite fiber solution, a thermoplastic elastomer solution, a solid electrolyte matrix and a positive electrode material; performing coaxial electrostatic spinning treatment on the composite fiber solution and the thermoplastic elastomer solution to obtain a fiber adhesive; carrying out ball milling treatment on the fiber adhesive, the solid electrolyte matrix and the positive electrode material to obtain a fibration mixture; and carrying out hot rolling treatment on the fiberized mixture to obtain the solid electrolyte membrane. According to the preparation method provided by the invention, the fiber adhesive prepared from the composite fiber and the thermoplastic elastomer, the solid electrolyte matrix and the positive electrode material are subjected to ball milling and hot rolling treatment, so that the interface contact between the cathode and the electrolyte is optimized, the interface impedance is reduced, the cyclic stress is relieved, and the generation of interface cracks is inhibited; the prepared solid electrolyte membrane is high in ionic conductivity and stable in structure.

This invention relates to a biomass-based gel electrolyte membrane, its preparation method, and its application. The method includes preparing regenerated cellulose using a sol-gel method, adding sodium alginate and zinc chloride solution, and rapidly constructing a biomass-based composite gel electrolyte with a dual-network structure through metal ion coordination crosslinking. The biomass-based gel electrolyte membrane is obtained by adsorbing an aqueous electrolyte onto a gel membrane with a dual-network structure. This gel electrolyte membrane is then assembled with a zinc anode and a vanadium pentoxide cathode to obtain a zinc-ion battery. This invention features a simple method, readily available and inexpensive raw materials, easy product molding, convenient operation and control, and is conducive to industrial production. The prepared composite gel electrolyte membrane has a dual-network structure, exhibiting good stability, liquid retention capacity, and ionic conductivity, and demonstrates excellent cycle capacity and lifespan when applied to aqueous zinc-ion batteries.

The invention relates to a preparation method of an in-situ growth neutral gel electrolyte membrane regulated and controlled by ethanolamine and application of the neutral gel electrolyte membrane in negative electrode protection of an aqueous zinc ion battery. The gel is promoted to form a film on the surface of a zinc plate by utilizing the crosslinking effect of ethanolamine, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid and the strong bonding effect of ethanolamine and the zinc plate. The membrane can improve the problems of low ion transfer rate, high free water molecule content and high activity of the traditional gel electrolyte, effectively inhibit the generation of hydrogen evolution reaction, and improve the ion transfer number, thereby improving the stability of the negative electrode and the intestinal circulation performance of the battery. The method is simple and safe to operate and shows excellent electrochemical performance, and the invention provides the method for protecting the negative electrode of the aqueous zinc ion battery.

The invention discloses a fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte. The fluorinated COF enhanced PVDF-HFP composite gel polymer electrolyte is prepared from the following raw materials: polyvinylidene fluoride-co-hexafluoropropylene, a fluorinated covalent organic framework containing an ether oxygen bond and a carbon-carbon unsaturated double bond, bis (trifluoromethylsulfonyl) imide anion ionic liquid and fluorine-containing imide lithium salt, the fluorinated covalent organic framework containing the ether-oxygen bond and the carbon-carbon unsaturated double bond is prepared by carrying out condensation reaction on a perfluorophenylene-containing module and the ether-oxygen bond-containing aromatic module. According to the electrolyte, PVDF-HFP is used as a polymer matrix, bis (trifluoromethylsulfonyl) imidogen ionic liquid is used as a functional phase and a plasticizer, imide lithium salt is used as a lithium ion source, fluorinated COF containing ether oxygen bonds and olefinic bonds is introduced, and the electrolyte has high ionic conductivity, high lithium ion transference number, excellent mechanical property and interface stability; the method is especially suitable for a high-safety lithium metal battery system.

The invention is suitable for the technical field of electrochemical energy storage, and provides an integrated structure solid-state battery module constructed based on SiO2 aerogel powder and a preparation method of the integrated structure solid-state battery module. And a stress buffering-ion conduction-thermal triggering self-repairing collaborative interface system is constructed. According to the Janus powder, a ZrO2 nanocluster and a SiO2 network form a rigid core, a dynamic shell containing a Diels-Alder dynamic covalent bond is grafted on the outer surface and the inner wall of a pore channel, and a lithium salt-ionic liquid compound is loaded in pores; a vertical columnar stress supporting framework is formed through a transient liquid phase auxiliary cold sintering process, and two-step thermal triggering self-repairing treatment is combined, so that stress buffering of electrode volume change in the charging and discharging process and interface self-repairing in the early stage of thermal abuse are achieved. The interface stability, the cycle life and the thermal safety of the solid-state battery are remarkably improved, and the solid-state battery is suitable for power batteries, high-capacity energy storage batteries and other scenes.

The invention discloses a hydrogel-based high-voltage aqueous lithium ion fiber battery and a preparation method thereof, and the fiber battery adopts a positive and negative electrode parallel structure and comprises a fiber positive electrode, a fiber negative electrode and a functional hydrogel electrolyte. The functional hydrogel electrolyte is of a three-dimensional network structure formed by a polymer and contains a combination of a low-concentration lithium salt and a functional additive, the polymer can be bonded with free water to reduce the reaction activity of water, and the functional additive can adjust the solvation structure of lithium ions and change the components of a solid electrolyte interface film (SEI) on the surface of a negative electrode, so that the solid electrolyte interface film (SEI) is formed. The two effects are synergistically coupled, and the high electrochemical stability window electrolyte exceeding 3.3 V is realized. The prepared water-based lithium ion fiber battery has a 2.5 V high-voltage platform and excellent mechanical flexibility, the electrolyte leakage problem of the water-based battery is solved through the design of the quasi-solid electrolyte, the energy density and safety of the water-based lithium ion fiber battery are improved, and application of the flexible water-based battery in the field of wearable electronics is promoted.

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

The invention relates to a preparation method of a gel polymer electrolyte and the gel polymer electrolyte, and the method comprises the following steps: dissolving a polymer matrix in a fluorinated solvent, and adding a lithium salt, an initiator and an additive into the fluorinated solvent; stirring the fluorinated solvent through an ultrasonic dispersion technology to form a homogeneous precursor solution; injecting the precursor solution into a battery shell, carrying out thermal polymerization at a preset polymerization temperature for a preset polymerization time, and forming an electrolyte membrane with a three-dimensional cross-linked network structure in the battery shell; after a residual solvent in a battery shell is removed through vacuum drying, an electrolyte membrane with a three-dimensional cross-linked network structure is used as a flexible self-supporting gel polymer electrolyte. The gel polymer electrolyte is an electrolyte membrane with a three-dimensional cross-linked network structure, can inhibit the growth of lithium dendrites and improve the ion migration efficiency, is superior to the existing electrolyte in ionic conductivity and Li < + > transference number, and is suitable for high-energy-density energy storage lithium batteries.

The invention relates to a high-voltage polyoxyethylene (PEO)-based solid electrolyte and a preparation method thereof, and belongs to the technical field of solid-state battery materials. The electrolyte is composed of a polymer substrate, an inorganic filler, a cosolvent and a lithium salt, the polymer substrate is a PEO-polyacrylonitrile (PAN) composite substrate; the inorganic filler is lithium titanium aluminum phosphate LATP, and the cosolvent is fluoroethylene carbonate FEC; the lithium salt is lithium bis (trifluoromethanesulfonic acid) imide LiTFSI and lithium difluoro (oxalato) borate LiDFOB; the dispersing agent is acetonitrile ACN. The method has the advantages that PEO and FEC are complexed to form a new structure, and room-temperature efficient operation of a single-salt (LiTFSI) system is realized; and meanwhile, LiDFOB is cooperatively introduced to construct a stable passivation layer on a positive electrode interface, FEC synchronously induces to generate LiF-rich stable SEI on a lithium negative electrode, and the interface compatibility and electrochemical stability of the electrolyte to a high-voltage electrode are remarkably improved.

The invention discloses a rigid-flexible coupling all-solid-state battery suitable for a high-expansion electrode and a preparation method thereof.The all-solid-state battery comprises a composite positive electrode, an all-polymer electrolyte layer and a composite negative electrode which are sequentially assembled, and in-situ polymerization polymer electrolyte networks are constructed in the composite positive electrode and the composite negative electrode; the all-polymer electrolyte layer comprises a polymer electrolyte network constructed by in-situ polymerization, a lithium salt, a plasticizer and a fast ion conductor ceramic filler; polymer electrolyte networks in the composite positive electrode, the composite negative electrode and the all-polymer electrolyte layer are of a double-network structure consisting of a rigid polymer skeleton and a flexible cross-linked polymer network. Through the integrated structural design of the all-polymer electrolyte and the composite electrode, the ionic conductivity, the interface stability, the cycle performance and the safety performance are synergistically improved, and the requirements of high energy density and high-safety energy storage are met.

The invention relates to the technical field of electrochemical energy storage materials, and discloses a gel polyelectrolyte, a preparation method and application and an aqueous zinc metal battery. The electrolyte is of a micron-sized micropore three-dimensional internet porous structure, and the three-dimensional internet porous structure is formed by copolymerization of polymer monomers; the polymer monomers are acrylamide and zinc 2-acrylamide-2-methylpropanesulfonate, the acrylamide provides a hydrophilic amide group, the hydrophilic amide group and a sulfonate group in the zinc 2-acrylamide-2-methylpropanesulfonate form a dynamic hydrogen bond network, the sulfonate group is covalently anchored to a polymer main chain, and the polymer main chain is covalently anchored to form a dynamic hydrogen bond network. And a main carrier Zn < + > is coordinated with-O-and-N-atoms on a polymer chain. According to the invention, salt-free single ion conduction is realized, concentration polarization is inhibited by sulfonate covalent anchoring, a dynamic hydrogen bond network provides excellent water-retaining property, the problem of moisture evaporation of traditional gel is solved, the interface stability is enhanced by coordination of Zn < + > and a polymer chain, the dendritic crystal inhibition effect is remarkable, and the ion transference number is far greater than that of traditional double-ion electrolyte.

The invention discloses a lithium-stable ultrathin flexible solid electrolyte film based on a high-dielectric oxide skeleton, and belongs to the technical field of solid electrolyte. The ultra-thin flexible solid electrolyte film comprises a framework, a dielectric layer and a flexible layer, wherein the framework is composed of a high-dielectric oxide; and the polymer electrolyte is formed by in-situ curing, covers the surface of the framework and is filled in the pores of the framework. Benefited from the high dielectric oxide skeleton, the ultrathin flexible solid electrolyte film has high stability to lithium, high ionic conductivity, high ionic transference number and long cycle life, and is very suitable for preparing a solid-state battery with high volume and / or high mass energy density.

The invention discloses a preparation method of an in-situ self-generated diaphragm type dual-network polymer electrolyte and a battery, and belongs to the technical field of lithium batteries. A staged in-situ polymerization strategy is adopted and comprises the following steps: firstly, applying a precursor solution containing an acrylate monomer, a polythiol cross-linking agent, a cyclic ether monomer, an initiator and a lithium salt to the surface of an electrode, partially polymerizing the solution under first initiation conditions such as transient ultraviolet irradiation and the like, and generating a layer of semi-solid gel diaphragm on the surface of the electrode in situ; then, an electrode with the gel diaphragm and a counter electrode are safely assembled into a battery; and finally, under second initiation conditions such as room temperature curing and the like, integrally curing and forming the dual-network polymer electrolyte in the battery. According to the method disclosed by the invention, physical isolation is realized by ingeniously utilizing the intermediate-state gel diaphragm, and the prepared electrolyte has high ionic conductivity, high mechanical strength and excellent interface stability, so that the assembled diaphragm-free solid-state lithium battery shows ultra-long cycle life.

The present application relates to an all-solid-state battery preparation method and an all-solid-state battery. The method comprises: S10, stacking a negative electrode, a solid-state electrolyte, and a positive electrode to form a stacked body; S20, sealing the stacked body with a sealing film to form a pressure-retaining member; and S30, using a first preset pressure to uniformly press the pressure-retaining member from all sides for 1-60 minutes, wherein the first preset pressure is 550-1000 MPa. The all-solid-state battery preparation method and the all-solid-state battery in the embodiments of the present application offer the advantage of high density.

The invention discloses a coated sulfide solid electrolyte as well as a preparation method and application thereof. The coated sulfide solid electrolyte comprises sulfide solid electrolyte particles and a surface hydrophobic layer coating the sulfide solid electrolyte particles. Thus, the hydrophobic solvent and the sulfide solid electrolyte are tightly combined through intermolecular interaction force (O-S, S-S and I-S), the surface of the sulfide solid electrolyte is wrapped with the hydrophobic solvent, a surface hydrophobic layer of the sulfide solid electrolyte is formed, high ionic conductivity and good processability of the sulfide solid electrolyte are kept, and meanwhile, the surface hydrophobic layer of the sulfide solid electrolyte is formed. The reactivity of the sulfide solid electrolyte and air is effectively inhibited, and the core bottleneck that the sulfide solid electrolyte is sensitive to air and is easier to lose efficacy after being refined is systematically solved. The synergistic improvement of stability, interface performance and process feasibility is realized, and a key material support is provided for commercialization of sulfide all-solid-state batteries.

This invention provides an aqueous composite electrolyte membrane and a solid-state battery. The raw materials for preparing the aqueous composite electrolyte membrane include polymer materials, water, modified inorganic solid-state electrolyte materials, and modified lithium salts. The modification method for the modified inorganic solid-state electrolyte materials and modified lithium salts includes: drying the inorganic solid-state electrolyte materials or lithium salts to obtain a dried material; mixing the dried material with an organic ether surface modifier to obtain a mixture; and sintering the mixture to obtain the modified inorganic solid-state electrolyte materials or modified lithium salts. This invention, through modification of the inorganic solid-state electrolyte materials and lithium salts, not only reduces the self-aggregation phenomenon of the inorganic solid-state electrolyte materials but also reduces the water absorption of the lithium salts. This enables the preparation of composite electrolyte membranes in an aqueous system, resulting in aqueous composite electrolyte membranes with advantages such as high ionic conductivity, high mechanical strength, high decomposition voltage, high environmental stability, low cost, and the ability to be mass-produced.

The invention relates to an electrochemical element comprising: -a negative electrode comprising an active material; -a 2024 / 022807 positive electrode comprising an active material comprising a lithium manganese iron phosphate; -a gel electrolyte comprising a matrix which is a polymer obtained by crosslinking a monomer comprising at least two acrylate groups, whereby a liquid mixture comprising at least one solvent, at least one lithium salt and a free-radical polymerisation thermal initiator is incorporated therein.

The invention discloses a perfluoropolyether-based polymer solid electrolyte film regulated and controlled by a mixed solvent as well as a preparation method and application of the perfluoropolyether-based polymer solid electrolyte film, and belongs to the field of organic polymer solid electrolyte preparation. Reacting under the action of an initiator and an RAFT (reversible addition-fragmentation chain transfer) reagent to obtain a perfluoropolyether-based copolymer; the method comprises the following steps: adding a perfluoropolyether-based copolymer into a polyvinylidene fluoride-hexafluoropropylene copolymer solution in which lithium salt is dissolved, the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, the mass of the N, N '-dimethylformamide, the mass of the trifluorotoluene and the mass of the perfluoropolyether-based copolymer account for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, and the perfluoropolyether-based polymer solid-state electrolyte film is obtained by uniformly mixing and then preparing a film. And the comprehensive performance of the composite solid electrolyte serving as the film is improved.

The invention provides a composite solid electrolyte membrane, a preparation method thereof and a secondary battery. The composite solid-state electrolyte membrane comprises a modified pyrochlore type oxide solid-state electrolyte, a polymer matrix and a lithium salt, and the modified pyrochlore type oxide solid-state electrolyte comprises a pyrochlore type oxide solid-state electrolyte and a polymer coating layer coating the surface of the pyrochlore type oxide solid-state electrolyte. The polymer coating layer and the pyrochlore type oxide solid electrolyte are connected through a covalent bond, the polymer coating layer is formed by in-situ polymerization of a polymer monomer on the surface of the pyrochlore type oxide solid electrolyte, and the polymer monomer is selected from a monomer with a trifluoroacetamide functional group and / or a monomer with a carbamate functional group. The composite solid electrolyte membrane provided by the invention has excellent lithium ion conductivity.

The invention relates to the technical field of lithium-ion solid-state batteries, in particular to a three-dimensional polymer modified intermediate layer for a lithium-ion solid-state battery and a preparation method of the three-dimensional polymer modified intermediate layer, and the preparation method comprises the following steps: adding polyacrylonitrile into N, N-dimethylformamide, and stirring until the polyacrylonitrile is completely dissolved; and then adding the modified polyamide acid-phosphonate copolymer, continuously stirring to obtain an electrostatic spinning precursor solution, and carrying out electrostatic spinning on the electrostatic spinning precursor solution to obtain the composite nanofiber membrane. According to the invention, the indium-containing heterocyclic modified diamine is used as a core monomer of the polyamide acid-phosphonate copolymer, the lithium deposition nucleation overpotential can be reduced by the excellent lithium-loving activity of the indium-containing heterocyclic modified diamine, the lithium is enabled to be compact and free of dendritic crystal deposition, and the indium-containing heterocyclic group is uniformly dispersed in a three-dimensional framework through a cross-linked network of the modified polyamide acid-phosphonate copolymer, so that the performance of the polymer is improved. The contact interface of the intermediate layer and the lithium metal forms a global uniform lithium-loving site, and concentrated deposition of lithium atoms caused by local lithium-loving activity difference is avoided.

A method for forming a shaped battery can include: adding electrolyte to a dry battery cell, shaping the battery cell, relieving stress and / or strain from the battery cell, curing the electrolyte, and / or injection moulding a thermoplastic or thermoset around the battery cell. A battery cell can include a cathode, an anode, a separator disposed between the cathode and the anode, a gel polymer electrolyte, an overmoulded housing surrounding the cathode, the anode, the separator, and the gel polymer electrolyte, where the battery cell comprises a non-zero radius of curvature about at least 1 axis.

The invention relates to the technical field of composite solid electrolytes, in particular to a metal organic framework-polymer composite solid electrolyte and a preparation method and application thereof.The preparation method comprises the following steps that a modified complexing system is added into an anhydrous solvent to form a complexing solution, modified UiO-66 is added into the complexing solution to form precursor slurry, and the precursor slurry is prepared; the preparation method comprises the following steps: taking a metal organic framework as a raw material, carrying out polymerization in a nitrogen atmosphere to form a gel electrolyte membrane, shaping the polymerized gel electrolyte membrane to obtain a composite solid electrolyte membrane, and soaking the composite solid electrolyte membrane in a lithium salt ethanol solution to obtain the metal organic framework-polymer composite solid electrolyte membrane. According to the invention, adsorption and transmission of Li < + > by UiO-66 are optimized through a hydrophilic / lithium-loving group of the modified coupling agent, the dissociation degree of lithium salt and the migration rate of Li < + > can be improved by a modified complexing system, and uniform distribution of Li < + > in the electrolyte is realized in cooperation with the lithium conduction effect of the modified UiO-66, the local current density is reduced, and dendritic crystal growth is inhibited in dynamics.

The invention provides an electrode assembly, a battery monomer, a preparation method, a battery device and a power utilization device, the preparation method of the battery monomer comprises the following steps: providing a to-be-pressed electrode assembly, at least one side of the to-be-pressed electrode assembly along the thickness direction of the to-be-pressed electrode assembly being an outermost active material layer; bonding a bonding layer on the outermost active material layer to form a middle assembly; pressing the intermediate assembly to obtain a pressed assembly, wherein the density of the pressed assembly meets the first preset density; removing the bonding layer and the outermost active material layer of the pressed assembly to form an electrode assembly; and assembling the electrode assembly into the shell to prepare the battery monomer. The energy density of the single battery can be improved.

The invention provides a negative pole piece, a battery monomer, a battery device and a power utilization device, the negative pole piece comprises a negative pole current collector and a first negative pole active material layer and a second negative pole active material layer which are located on at least one surface of the negative pole current collector, and the second negative pole active material layer is located between the negative pole current collector and the first negative pole active material layer; the first negative electrode active material layer comprises a first negative electrode active material, the first negative electrode active material comprises a first silicon-based material, the second negative electrode active material layer comprises a second negative electrode active material, and the second negative electrode active material comprises a pre-lithiated silicon-based material. And the volume expansion rate of the first silicon-based material is smaller than that of the pre-lithiated silicon-based material. The negative pole piece is applied to the battery monomer, so that the battery monomer has high energy density, high first coulombic efficiency and good cycle performance.