1123 results about "Interfacial impedance" 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.

The invention discloses a composite polycrystalline positive electrode material which is prepared by permeating and coating a polycrystalline positive electrode material with an oxyhalide solid electrolyte, and the oxyhalide solid electrolyte comprises one or more of Li-Ta-O-Cl, Li-Nb-O-Cl, Li-Zr-O-Cl and Li-Al-O-Cl. The specific oxyhalide electrolyte is adopted to carry out permeation coating on the polycrystalline positive electrode material, uniform coating on the surface of the polycrystalline positive electrode material and grain boundaries in particles is completed, capacity utilization in the particles of the polycrystalline positive electrode material is achieved, and the capacity utilization rate of the particles of the polycrystalline positive electrode material is improved through the coating effect of the oxyhalide with high ionic conductivity. Ion transmission inside and in gaps of the polycrystalline positive electrode material particles is regulated, interface impedance is reduced, energy density is improved, and the application prospect is wide.

The invention relates to the technical field of hydrogen production, in particular to a bipolar plate runner structure-mass transfer efficiency parameter simulation optimization method. Comprising the steps that a flow channel structure is designed, specifically, a bipolar plate flow channel is constructed through a fractal tree-shaped network topological structure, the flow channel is composed of multiple stages of branch channels, the section size of each stage of branch channel is decreased progressively according to a self-similarity proportion, and a three-dimensional flow channel network with fractal dimensions is formed; multi-physics field coupling modeling: establishing a multi-physics field coupling model including fluid flow, electrochemical reaction and heat and mass transfer based on computational fluid mechanics and a finite element method, wherein the model considers a turbulence effect in a flow channel, interface impedance of a porous medium diffusion layer and reaction kinetic parameters at the same time; parameter sensitivity analysis: screening key parameters influencing mass transfer efficiency through orthogonal test design, including flow channel fractal dimension, branch angle, porosity and surface wettability parameters, and constructing a parameter response curved surface; the flow channel structure of the bipolar plate can be accurately optimized, and the mass transfer efficiency is effectively improved.

The invention belongs to the technical field of solid-state battery materials, and discloses an inorganic solid-state electrolyte lanthanum lithium zirconate surface interface non-metallic element doped modified material using a plasma technology and a preparation method and application thereof, which can reduce the interface impedance of an electrolyte and improve the electrochemical performance of the electrolyte. By using the plasma technology, impurities such as lithium carbonate and the like on the surface of the inorganic solid electrolyte lanthanum lithium zirconate can be etched, a lithium-loving protective layer can be generated in situ on a surface interface, and the air stability of the electrolyte block is improved. According to the invention, multi-aspect modification can be realized by combining a plasma technology with a plurality of non-metallic element excitation sources, corresponding gain protection layers can be formed according to different requirements, and performance exertion of the battery in different fields is facilitated. When the inorganic solid electrolyte lanthanum lithium zirconate modified material obtained by the method disclosed by the invention is in contact with lithium metal to form a battery, the inorganic solid electrolyte lanthanum lithium zirconate modified material shows relatively low interface contact resistance and excellent cycling stability, and has a good application value.

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 discloses an electroencephalogram sensing electrode and a using method thereof.The electroencephalogram sensing electrode comprises a shell assembly, the shell assembly comprises a shell, a base and a top cover, the shell and the base are connected to form a slow-release probe containing cavity, the shell and the top cover are connected to form a liquid storage cavity, and a fluid valve, a slow-release material, a capillary hole plug, a rapid flow hole and a slow flow hole are arranged in the shell assembly; a semi-dry electrode is made by injecting conductive liquid or a wet electrode is made by injecting conductive paste, and through a fluid valve, a slow-release material, a capillary hole plug, a quick flow hole and a slow flow hole, the electrode can quickly supply liquid to the position between the electrode and the scalp to reduce resistance and slowly supply liquid to reduce resistance, and the electrode-scalp interface impedance can be quickly reduced and can be balanced and stabilized for a long time. The electrode has the advantages that the electrode can be used as a semi-dry electrode by injecting conductive liquid, can also be used as a wet electrode by injecting conductive paste, and has the functions of storing the conductive liquid for a long time without releasing the conductive liquid when the electrode is idle and supplying the conductive liquid in two modes of fast and slow to reduce scalp-electrode impedance when a user wears the electrode to acquire signals.

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 solid electrolyte and a preparation method and application thereof, the solid electrolyte comprises a solid electrolyte matrix and a coating layer existing on the surface of the solid electrolyte matrix, and the coating layer comprises an inorganic substance with a sublimation temperature less than 500 DEG C; the coating rate of the solid electrolyte is greater than or equal to 90%. According to the solid electrolyte provided by the invention, the coating layer is introduced to the surface of the solid electrolyte matrix, the inorganic matter with the sublimation temperature less than 500 DEG C is used as the coating material, and the coating rate is greater than or equal to 90%, so that the interface impedance between the solid electrolyte and the electrode material can be reduced, and the microdefects and pores on the surface of the solid electrolyte matrix can be filled up; meanwhile, the solid electrolyte matrix can be prevented from being directly exposed in the environment, chemical bonds can be formed between the solid electrolyte matrix and some metal elements in the solid electrolyte matrix, and therefore the ionic conductivity retention rate and stability of the solid electrolyte can be improved, and the specific capacity and the first coulombic efficiency of a battery can be improved when the solid electrolyte is applied to the battery.

The invention provides a coated modified high-nickel ternary positive electrode material, a preparation method and a lithium ion battery, the coated modified high-nickel ternary positive electrode material comprises a high-nickel ternary matrix and a coating layer containing an oxide solid electrolyte, the coating layer is coated outside the high-nickel ternary matrix and accounts for 1%-3% of the mass of the high-nickel ternary matrix; the oxide solid electrolyte comprises Li < 3x > La < 2 / 3-x > TiO < 3 > (0 lt; x < = 0.16), Li < 7 > La < 3 > Zr < 2 > O < 12 >, Li < 1 + y > Al < y > Ti < 2-y > (PO < 4 >) < 3 > (0 lt; y < = 0.5); the ionic conductivity of the oxide solid electrolyte is greater than or equal to 1 * 10 <-4 > S / cm. The selected oxide solid electrolyte has high ionic conductivity and electronic insulativity, a rapid lithium ion transmission channel can be provided, interface side reaction can be inhibited, the rate capability and the cycling stability of the material can be remarkably improved, and when the oxide solid electrolyte forms a coating layer, the coating layer is not prone to deformation, and the service life of the material is prolonged. The interface bonding strength with a high-nickel ternary matrix can be improved through chemical bonding, the interface impedance can be remarkably reduced, and the dynamic performance of the material is improved.

The invention provides a high-stability lithium-rich manganese-based positive electrode material and a preparation method thereof, and relates to the technical field of lithium-rich manganese-based positive electrode materials, and the method comprises three steps of preparation of a homogeneous precursor, solid-state mechanical fusion doping and coating, and high-temperature sintering; a lithium-rich manganese-based precursor is prepared by adopting a homogeneous coprecipitation process, uniform distribution of metal ions is ensured, then an aluminum source, a zirconium source and a fluorine source are introduced as doping agents, phosphate and a titanate coating agent are combined, doping and coating integrated treatment is realized through mechanical ball milling, and the lithium-rich manganese-based composite material is obtained. And finally, mixing with a lithium source in an argon atmosphere, and carrying out high-temperature sintering of temperature programming and staged heat preservation to form a stable composite coating layer in situ. Therefore, manganese ion migration is effectively inhibited through lattice doping, a layered structure is prevented from being converted into spinel or rock salt phase, meanwhile, a nanoscale ion / electron transmission channel is constructed, interface impedance is reduced, and the charging and discharging efficiency under high voltage is improved.

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 lithium ion battery positive electrode materials, and particularly relates to a double-strategy modified high-nickel positive electrode material as well as a preparation method and application thereof. According to the double-strategy modified high-nickel positive electrode material, a high-nickel positive electrode material serves as a matrix, surface coating and bulk phase doping are achieved at the same time through competitive doping of main group elements, a coating layer is a fast ion conductor LiLaO2 nano layer, and a bulk phase doping element is Y. The fast ion conductor coating layer can provide an additional ion channel, promote conduction of ions on the surface of the positive electrode material, reduce interface impedance and improve the rate capability of the battery. The doping elements can optimize the crystal structure of the positive electrode material and can relieve stress generated in the charging and discharging process, so that phase change and structural degradation are reduced, and the structural stability of the positive electrode material is improved.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The invention provides an all-solid-state battery three-dimensional electrode preparation method based on aerosol jet printing, and the method comprises the following steps: constructing a three-dimensional porous frame by using a conductive skeleton material through an aerosol jet printing technology; depositing an active material and a solid electrolyte on the surface of the frame layer by layer to form a gradient distribution layer; generating an interface transition layer by adopting ultraviolet curing or rapid heat treatment; and in combination with a closed-loop feedback control system, deposition parameters are dynamically adjusted. A conductive active material and a solid electrolyte are uniformly distributed on the surface of a three-dimensional porous framework in a layer-by-layer deposition manner through an aerosol jet printing method, and the solid electrolyte and an electrode material form a close contact interface by accurately controlling a jet path, a nozzle diameter and a material deposition rate; the interface side reaction easily caused by traditional high-temperature sintering is eliminated, and the interface impedance is reduced; and furthermore, the transmission efficiency of the lithium ions at the interface is improved through an ultraviolet curing or rapid heat treatment process.

The invention discloses a high-conductivity carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium iron phosphate positive electrode materials, the high-conductivity carbon-coated lithium iron phosphate positive electrode material comprises a spherical lithium iron phosphate matrix, modified lithium niobium vanadate uniformly coating the exterior of the nanoscale spherical lithium iron phosphate matrix, and a composite carbon layer uniformly coating the exterior of the modified lithium niobium vanadate; wherein the spherical lithium iron phosphate matrix has a smaller specific surface area, so that the reduction of side reaction is facilitated, and the interface impedance can be reduced; the modified lithium niobium vanadate can improve the electronic conductivity of the positive electrode material and the diffusion rate of lithium ions; an organic carbon source in the outermost composite carbon layer is carbonized to form a continuous amorphous carbon layer which uniformly coats the surfaces of the particles, so that a basic electron channel is provided, and side reaction of an electrolyte is inhibited; the inorganic carbon source constructs a three-dimensional conductive skeleton, and a long-range conductive network is formed through the bridging effect of nanowires / sheets, so that the interface contact resistance is reduced, and the conductivity of the positive electrode material is improved.

The invention relates to the technical field of material detection, in particular to a silver coating adhesive force detection method based on multi-frequency impedance imaging, which comprises the following steps: applying a dual-mode multi-frequency excitation signal to the surface of a silver coating through an attached microelectrode array, synchronously acquiring voltage-current response data, and generating a dual-mode multi-frequency impedance original data set; performing time-varying impedance phase-locked separation on the dual-mode multi-frequency impedance original data set, extracting a dynamic impedance component of a coating-matrix interface region, and reconstructing a three-dimensional sub-interface impedance distribution diagram; and outputting an adhesive force quantized value through an oscillation frequency-adhesive force conversion model according to the spatial oscillation frequency characteristics of the impedance phase in the three-dimensional sub-interface impedance distribution diagram. According to the invention, a double-phase-locked loop system is adopted to realize the time-varying component demodulation of the impedance response of the silver coating-matrix interface, the low-frequency dynamic impedance signal modulated by silver ion migration is effectively extracted, and the weak change of the interface bonding state is sensitively reflected.

The invention discloses preparation of an organic-inorganic composite binder and application of the organic-inorganic composite binder in a silicon negative electrode of a lithium ion battery. The binder is prepared through in-situ thermal initiation, has good interfacial compatibility and high ionic conductivity and is of a three-dimensional network structure. According to the binder, an organic binder and an inorganic binder are cross-linked through an organic small molecule cross-linking agent to form a rigid-flexible three-dimensional network structure, the organic binder has the advantages of being good in flexibility, large in elasticity and high in adhesive force, and the silicon negative electrode is good in interfacial compatibility, high in ionic conductivity and large in rigidity after being compounded with the inorganic binder; the adhesive has good interfacial compatibility with silicon particles, can promote formation of a solid electrolyte interface film (SEI film) and reduce interface impedance, has excellent ionic conductivity, obviously improves mechanical properties and adhesive properties of the adhesive, effectively deals with stress generated by huge volume change of a silicon negative electrode, and improves the service life of the silicon negative electrode. Therefore, the cycle life and initial coulombic efficiency of the battery are improved, and the service life of the battery is prolonged.

The invention discloses a preparation method of an all-solid-state battery unit, the all-solid-state battery unit and an all-solid-state battery module. The preparation method comprises the following steps: 1) pressing and pre-calcining a positive electrode unit to form a sintered laminated body; (2) alternately overlapping at least one negative electrode and the sintered laminated body in the step (1) to form an all-solid-state battery laminated body, and pressurizing the laminated body; (3) carrying out low-temperature primary calcination on the all-solid-state battery laminated body in the step (2); (4) carrying out high-temperature secondary calcination on the all-solid-state battery laminated body obtained in the step (3); wherein the positive electrode unit in the step 1 comprises a solid electrolyte layer, a composite electrode layer and a current collector layer; the composite electrode layer comprises a high ion channel layer and a high electron channel layer. The stable particle space is constructed through multiple times of calcination, the interface impedance between the electrode layer and the electrolyte layer and the interface impedance between the electrode layers are reduced, the densification between the solid electrolyte and the electrode is improved, and the battery capacity and the cycle performance are improved.

The invention provides a composite positive pole piece, a preparation method thereof and a solid-state battery. The composite positive pole piece comprises a positive pole current collector and a positive pole diaphragm arranged on the surface of the positive pole current collector, the positive pole diaphragm comprises a positive pole active material, a conductive agent and a first binder, a three-dimensional pore of the positive pole diaphragm comprises a halide solid electrolyte and a second binder, the three-dimensional pore is the positive pole active material, and the second binder is a second binder. And a gap between the conductive agent and the first binder. According to the composite positive pole piece provided by the invention, the halide solid electrolyte is contained in the three-dimensional pores of the positive pole piece, so that the contact area between the positive pole active material and the electrolyte is maximized, and the diffusion length of ions in the positive pole piece is shortened; the method is used for reducing the interface impedance between a positive electrode active material and an electrolyte in the battery so as to improve the rate capability and the cycling stability of the battery.

The present invention discloses a method for preparing a composite solid electrolyte membrane, the composite solid electrolyte membrane comprises three layers, the first layer is a composite solid electrolyte layer containing oxide-polymer, the second layer is a sulfide solid electrolyte layer, and the third layer is a polysiloxane solid electrolyte layer; the preparation method comprises the following steps: S1, preparation of the first layer: immersing a polymer porous membrane as a substrate into the first layer slurry, coordinating ultrasound to make the first layer slurry fully fill the pores, and drying to obtain; S2, preparation of the second layer: coating the second layer slurry on the basis of the first layer, drying to obtain; S3, preparation of the third layer: coating the third layer slurry on the basis of the second layer, drying to obtain; S4, pressing: the first, second and third layers are hot-pressed by rollers to obtain. The composite solid electrolyte membrane of the present invention can effectively improve the interface contact between the solid electrolyte and the positive and negative electrodes, reduce the interface impedance, and has the characteristics of high mechanical strength, high ionic conductivity, good thermal stability, etc.

The invention relates to the field of lithium ion battery materials, and particularly discloses a composite positive electrode material as well as a preparation method and application thereof. The composite positive electrode material comprises a positive electrode active material and a coating material coated on the surface of the positive electrode active material, lithium iron phosphate is used as a basic raw material, and the positive electrode active material is prepared by doping rare earth elements and non-metallic elements; the surface of the positive active matter is coated with a layer of mixture which takes sulfide solid electrolyte, a conductive agent and lithium salt as raw materials, interface impedance is effectively reduced through element doping and surface coating, the interlayer spacing of the material is increased, and the diffusion rate of lithium ions is improved, so that the lithium ion battery also has good electrical properties in a wide temperature range. According to the technical scheme, the problems that in the prior art, the charging and discharging efficiency of a lithium battery is reduced in a high / low-temperature environment, the battery capacity is attenuated, and the cycle performance and the service life of the battery are affected are effectively solved.

The invention discloses an artificial SEI material and a preparation method thereof, an artificial SEI film and an artificial SEI film modified negative electrode. The artificial SEI material is an organic polymer brush (CNF-g-PSSX) prepared by grafting cellulose nanofibers with polystyrene sulfonate. The polymer brush is of a crystal structure and has a firm framework; and the side chain of polystyrene sulfonate has rich-SO3 functional groups which are matched with cations in sulfonate, so that a rapid ion transmission channel is provided, high-current-density circulation can be realized, and good interface contact is ensured. Due to a special molecular topological structure and a multi-component synergistic effect, when the organic polymer brush forms an artificial SEI film, high mechanical strength, high ionic conductivity and low interface impedance can be obtained at the same time, and through strong electrostatic repulsion between a negatively charged-SO3 group and the surface of a negatively charged lithium dendrite tip, the electrochemical performance of the artificial SEI film is improved. An obvious inhibition effect is shown on the continuous growth of dendritic crystals.

The invention provides a solid-state battery and a preparation method thereof, and particularly relates to the technical field of solid-state batteries. The solid-state battery is composed of a plurality of laminated units, the laminated unit comprises a positive pole piece, an all-solid-state electrolyte membrane and a negative pole piece which are sequentially stacked according to a sandwich structure; among the positive pole piece, the all-solid-state electrolyte membrane and the negative pole piece, convex structures and concave structures which are uniformly arranged are distributed on any two mutually contacted surfaces of the positive pole piece, the all-solid-state electrolyte membrane and the negative pole piece. When the components of the solid-state battery are overlapped, the convex structures and the concave structures on the surfaces of the solid-state battery can be mutually engaged to form a stable micro-embedded structure, the interface bonding strength between the positive electrode and the electrolyte and between the negative electrode and the electrolyte is greatly enhanced through physical embedding, and the problem of unstable bonding in the prior art is solved. Meanwhile, the uniform concave-convex structure ensures the controllability and consistency of the interface contact area, effectively reduces and stabilizes the interface impedance, improves the performance consistency of the pole piece, and further improves the production yield and the overall performance stability of the battery.

The invention provides a lithium ion battery and an electric device, the lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, the positive electrode comprises a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material and an oxide solid electrolyte, and the surface of the diaphragm is provided with an oxide solid electrolyte layer; the electrolyte comprises a solvent, a lithium salt, a first additive and a second additive, the first additive comprises fluoroethylene carbonate, and the second additive comprises 1, 3-propane sultone; the lithium ion battery satisfies the following conditions: 0.72 < = (H + X) / P < = 8; 0.5 < = (A + B) / (H + X) < = 8.89; 0.16 < = H / X < = 6.4; 0.5 < = A / B < = 12. According to the lithium ion battery provided by the invention, the safety and the high and low temperature performance of the positive electrode of the lithium ion battery are remarkably improved through multi-component cooperative regulation and control, further, when the lithium ion battery meets the limitation of the relational expression at the same time, the interface impedance can be reduced to the maximum extent, and the performance of the lithium ion battery can be improved through cooperation of multi-component parameters. And synchronous optimization of thermal safety, low-temperature discharge capacity and high-temperature cycle life of the battery is realized.

The invention relates to a composite diaphragm with high ionic conductivity, a composite solid electrolyte and a preparation method thereof. The composite diaphragm is composed of a lithium lanthanum-based fluorine-doped solid electrolyte LLMOF and a base membrane, the chemical general formula of the LLMOF is Li < x > La < y > M < 1 > < z > M < 2 > < w > M < 3 > O < 6 > F, wherein M1 is a tetravalent cation, M2 is a pentavalent cation, and M3 is a hexavalent cation; 1 < x + 3y < 5, 0 < x < = 2, and 1 / 3 < y < 5 / 3; 0 < = z < = 2, 0 < = w < = 2, 0 < = u < = 2, z + w + u = 2; the base membrane is a large-aperture base membrane, and the aperture r is more than or equal to 200nm and less than or equal to 1mu m; the particle size D50 of the LLMOF is 50 nm to 1 [mu] m, and the particle size D50 of the LLMOF is less than or equal to the aperture r of the base film. According to the composite diaphragm disclosed by the invention, the LLMOF solid electrolyte with an ion channel function is introduced, so that efficient conduction of ions is realized; the particle size is matched with that of a large-aperture base membrane, the membrane can be uniformly embedded into membrane holes, a continuous conduction path is constructed, and the ionic conductivity is improved; meanwhile, the composite diaphragm has excellent thermal stability and interface wettability, interface impedance is effectively reduced, and growth of lithium dendrites is inhibited.

The invention relates to a preparation method and application of an organic-inorganic artificial composite solid electrolyte interface layer, and belongs to the technical field of lithium metal batteries. The organic polymer, the black phosphorene, the conductive carbon black and other inorganic substances are uniformly mixed to construct the organic-inorganic artificial composite interface layer, and the organic-inorganic artificial composite interface layer can induce uniform lithium deposition, reduce the local current density caused by nonuniformity and roughness of the surface of the copper current collector, reduce the lithium nucleation barrier, and improve the lithium ion battery performance. Meanwhile, the affinity of deposited lithium and a current collector is enhanced, the interface impedance of the negative-electrode-free lithium metal battery is remarkably reduced, and the lithium dendrite growth of a lithium metal negative electrode is inhibited; the cathode-free lithium metal battery assembled by adopting the copper current collector modified by the organic-inorganic artificial composite interface layer shows long cycle stability, good rate capability and remarkable safety performance, and has a wide commercial application prospect.

The invention relates to an organic solid electrolyte for an in-situ curing high-voltage positive electrode, a battery and a preparation method. The organic solid electrolyte is formed by in-situ polymerization of ether monomers, ester monomers, a lithium salt and a solvent through synergistic thermal initiation of double initiators. The electrolyte disclosed by the invention has the advantages that the ester polymer monomer and the ether polymer monomer are blended, and then the two monomers are respectively polymerized in a thermal initiation manner to form mutually crossed macromolecular long chains. The strategy can improve the interface stability of the electrode and the electrolyte and reduce the interface impedance of the electrode and the electrolyte. In the formed polymer network structure, the ester chain segment enhances the mechanical strength and widens the electrochemical window; and the ether chain segment provides flexible and lithium ion transmission channels. Due to the chemical complementarity of the ester monomers and the ether monomers, the overall performance of the composite polymer electrolyte is improved.

The invention discloses a composite electrolyte membrane for inhibiting lithium dendrite growth of a solid-state battery, a preparation method of the composite electrolyte membrane and the battery, and belongs to the technical field of solid-state electrolyte. The composite electrolyte membrane comprises two layers of electrolyte membrane structures, the first layer of electrolyte membrane comprises an electrolyte and a binder; the second layer of electrolyte membrane comprises an electrolyte and a binder; the particle size of the electrolyte in the first layer of electrolyte membrane is less than 2 microns, and the particle size of the electrolyte in the second layer of electrolyte membrane is 2-10 microns. By arranging the two-layer electrolyte membrane structure, the composition of the first-layer electrolyte membrane and the second-layer electrolyte membrane and the particle size of the electrolyte of the two-layer electrolyte membrane are specifically limited; the electrolyte particle sizes of the two layers of electrolyte membranes are limited, the electrolyte membrane of the small-particle-size electrolyte is arranged to be close to the negative electrode, the contact area is increased, the interface impedance is reduced, and the overall density of the electrolyte membranes is ensured by arranging the electrolyte membrane of the large-particle-size electrolyte.

The invention discloses an interfacial film for an ion battery, a preparation method of the interfacial film, the ion battery and an electric device, the interfacial film for the ion battery is finally obtained by performing multi-step modification on a carbon nano tube and reacting the carbon nano tube with a prepolymer solution, so that the interfacial film can effectively reduce the interfacial impedance and promote ion transmission, and the performance of the ion battery is improved. The modified carbon nanotubes are combined with polyimide through the action of covalent bonds, so that the mechanical property of an interfacial film is improved, dendritic crystal puncture can be physically inhibited through the high mechanical strength of the interfacial film, and the cycling stability and the rate capability of the battery are improved; and meanwhile, the interfacial film can inhibit side reaction between the negative electrode and electrolyte, reduce interface impedance and promote ion transmission, so that the overall electrochemical performance of the battery is improved.

The invention relates to a preparation method and application of an electrode, in particular to a preparation method and application of an anti-reverse current self-supporting electrode for anion exchange membrane water electrolysis hydrogen production. The self-supporting (NiCoFe) 9S8 electrode is constructed by adopting a directional solid-phase synthesis strategy to overcome the challenge of performance degradation of the electrolytic cell. The preparation method comprises the following steps: firstly, depositing a precursor solution of FeS2 and CoCl2 on a nickel felt substrate, and then carrying out annealing treatment to obtain uniformly grown (NiCoFe) 9S8; the method not only ensures uniform distribution of multiple metal components, but also constructs firm chemical bonding and efficient charge transfer between the catalyst layer and the conductive substrate through solid-phase interface reaction, and effectively avoids interface impedance caused by introduction of an additional binder. Therefore, high-current-density water electrolysis hydrogen production under intermittent fluctuation power supply is realized. In 1M KOH, the cell voltage is almost not attenuated when the electrode stably operates for 2000h at 500mAcm <-2 >.