142results about How to "Reduce interface impedance" patented technology

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

The invention provides a preparation method and application of an air-stable sulfide composite electrolyte, and the method comprises the following steps: S1, weighing an M source (M = Cd, Mn and Zn), P2S5 and S powder according to a ratio of 1: 1: 3, adding iodine for catalysis, carrying out heat preservation at 700-720 DEG C for 6-7 days, and carrying out K + insertion, Li + exchange and ultrasonic centrifugation to prepare a LiMyPS3 nanosheet dispersion liquid; s2, dissolving PEO and LiTFSI in acetonitrile to form a film, drying to obtain a pure PEO film, immersing the pure PEO film into a dopamine Tris buffer solution with the concentration of 2 mg / ml and the pH value of 8.5, oscillating for 12-24 hours in an oxygen environment, and washing and drying to obtain a PDA-coated PEO film; and S3, carrying out suction filtration on the LiMyPS3 dispersion liquid to obtain a self-supporting membrane, stacking according to the sequence of "PDA-coated PEO membrane-sulfide membrane-PDA-coated PEO membrane", carrying out isostatic pressing at 10-20 MPa, and then carrying out vertical cutting at 0 DEG C to obtain the 20-30 [mu] m composite membrane. The film has the advantages of good air stability, almost no loss of conductivity after 30 days, room temperature conductivity of 9.2-10.2 ms / cm, excellent interface bonding force and mechanical strength, and stable window of 4.3-4.5 V, is adaptive to a high-voltage positive electrode, and can be used for a high-energy-density solid-state lithium battery.

The invention provides a composite positive plate, a preparation method thereof and a battery, and belongs to the technical field of batteries. The interface conductive layer is arranged on at least one side of the positive electrode active material layer, and the interface conductive layer comprises conductive filler and an elastic matrix. According to the composite positive plate, the interface conductive layer with conductivity, flexibility and elasticity is arranged on at least one side of the positive active material layer, so that when the composite positive plate is applied to the battery and the interface conductive layer is close to one side of the diaphragm, not only can the interface impedance be reduced, but also the wettability of electrolyte on the positive active material layer can be improved; when the interface conducting layer is close to one side of the shell, the positive electrode active material layer can be better protected, extrusion damage of the shell to the positive electrode active material layer is reduced, the interface conducting layer can serve as a current collector, the electrochemical performance of the battery is improved, and the interface conducting layer can adapt to volume expansion of the composite positive plate in the charging and discharging process of the battery and improve the cycle performance of the battery.

The present application relates to the technical field of sodium battery materials, in particular to a sodium supplement coating based on a spiral iron-carbon composite material and a preparation method thereof, a spiral polypyrrole template is synthesized by a chiral template method, Fe3C@CNS spiral carbon composite material rich in Fe3C nanocrystals and iron single-atom sites is prepared through iron loading, sulfidation and high-temperature pyrolysis, Na2C2O4@Fe3C@CNS composite material is prepared by highly dispersing sodium oxalate on the surface and in the pores of the spiral carbon composite material through a recrystallization method, finally, a slurry is prepared by mixing the Na2C2O4@Fe3C@CNS composite material with a conductive agent and a binder, and the slurry is coated on the surface of an electrode to form a functional sodium supplement coating. The sodium supplement coating based on the spiral iron-carbon composite material and the preparation method thereof solve the problems of poor interface stability and first-cycle irreversible sodium loss of existing sodium ion batteries, realize efficient sodium pre-activation and interface synergistic regulation, and improve the comprehensive performance of the battery.

The application relates to the technical field of battery materials. Disclosed are a lithium nickel-manganese acid positive electrode material, a preparation method thereof, a positive electrode and a battery. The lithium nickel-manganese acid positive electrode material comprises a base material and a first coating layer and a second coating layer successively coated on the surface of the base material; the chemical general formula of the base material is Li(Li a Ni b Mn c Fe d Sb e )O 4‑x , wherein a+b+c+d+e=2, 0<=x<=0.2, 0<=a<=0.1, 0.4<=b<=0.5, 1<=c<=1.5, 0.1<=d+e<=0.4; the first coating layer comprises NbTi(PO4)3, and the mass ratio of the first coating layer to the base material is 0.1-5:100; the second coating layer comprises a carbon material, and the mass ratio of the second coating layer to the base material is 0.1-5:100. The lithium nickel-manganese acid positive electrode material provided by the embodiment of the application has excellent electrochemical performance.

The application belongs to the technical field of flexible conductive materials for medical rehabilitation devices, and discloses a semi-invasive antibacterial electric stimulation rehabilitation hydrogel flexible electrode, which is prepared from a PVA-CMC-Na-HA-calcium propionate four-element synergistic system hydrogel and is surface-modified by sodium L-lactate; a three-dimensional network is constructed through one-pot physical crosslinking, polyvinyl alcohol and sodium carboxymethyl cellulose form a hydrogen bond interpenetrating network, hydroxyapatite is used as a rigid filler for reinforcement, and calcium propionate simultaneously acts as an ionic crosslinking agent and an electrolyte; sodium L-lactate forms a hydrophobic-hydrophilic gradient layer on the surface of the hydrogel in situ through an esterification reaction. The application solves the problems of mechanical mismatch, high impedance, poor biocompatibility of traditional metal electrodes, and the difficulty of simultaneously considering the strength, toughness and lubricity of existing hydrogels, realizes the mechanical properties of strong outside and tough inside of the electrode, has excellent biocompatibility and low impedance electric stimulation performance, does not need external conductive paste, and improves the comfort and safety of pelvic floor muscle rehabilitation treatment.

This invention provides a halide solid electrolyte and its preparation method, belonging to the field of solid electrolyte technology. First, alkylphosphonic acid is reacted with lithium carboxylate to prepare lithium-ionized alkylphosphonic acid. Then, the lithium-ionized alkylphosphonic acid is mixed with a halide electrolyte, and the mixture is dispersed in a solvent, stirred, filtered, and dried to obtain a halide solid electrolyte coated with lithium-ionized alkylphosphonic acid. This invention constructs a dense, uniform hydrophobic protective layer on the surface of halide electrolyte particles through in-situ coating with long-chain lithium alkylphosphonate, effectively isolating moisture and oxygen from the environment and significantly improving the air stability of the halide electrolyte. Simultaneously, this coating layer helps reduce the interfacial impedance between the electrolyte and electrode materials, optimizing the overall ionic conductivity of the material.

The present application relates to the technical field of lithium ion batteries, in particular to a core-shell structure binder for lithium battery carbon-coated current collector, its preparation method and application, the present application takes polyacrylonitrile seed emulsion, passes into nitrogen, adds shell monomer pre-emulsion, potassium persulfate aqueous solution, warms, reacts, cools, adds anhydrous ethanol, centrifugal, removes impurities, dries, grinds, obtains core-shell structure binder. The compact, hydrophobic shell layer of the core-shell structure binder acts as a barrier to prevent oxygen and moisture in the air from entering the core layer, thereby protecting the cyano group of the polyacrylonitrile in the core layer; when the lithium battery carbon-coated current collector is coated with the positive electrode material, the N-methyl pyrrolidone in the positive electrode material can selectively permeate the shell layer and swell with the cyano group of the polyacrylonitrile in the core layer, thereby improving the interlayer adhesion between the carbon-coated layer and the positive electrode material through subsequent drying, and solving the problem of poor stability of traditional polyacrylonitrile-based binders.

The application discloses an asymmetric double electric layer rubbing ion electron sensor and a preparation method thereof, and relates to the technical field of rubbing ion electron and self-powered sensing. The sensor comprises an ionic hydrogel layer, a first electrode and a second electrode; a spacing layer is arranged between the ionic hydrogel layer and the second electrode; wherein the first electrode and the second electrode are made of different materials, and the first electrode and the second electrode have different affinities to ions.

This invention relates to the field of sodium-ion battery technology, and discloses a sodium-ion cathode material, its preparation method and application, a sodium-ion battery, a sodium-ion battery pack, and a device. The sodium-ion cathode material includes a matrix and a coating layer covering the matrix; the matrix has the composition shown in Formula I: Na 1‑x [Ni y Mn z M u Ti v O2 Formula I; the coating layer has the composition shown in Formula II: Na 2‑β Ti 6‑α M′ α O 13 Formula II. This sodium-ion cathode material possesses characteristics such as high ionic and electronic conductivity, strong structural stability, and strong chemical stability. Furthermore, using this composite cathode material in sodium-ion batteries can effectively improve the battery's electrochemical performance.

The invention provides a sulfide-halide composite solid electrolyte, a preparation method thereof and a solid-state battery. The method comprises the following steps: mixing and ball-milling a sulfide electrolyte, a halide electrolyte, a dopant and an interface modifier under the protection of inert gas to obtain composite electrolyte powder; carrying out tabletting molding on the composite electrolyte powder under the protection of inert gas to obtain a composite solid electrolyte sheet; and carrying out annealing treatment on the composite solid electrolyte sheet under the protection of inert gas to obtain the sulfide-halide composite solid electrolyte. The sulfide-halide composite solid electrolyte disclosed by the invention can realize synergistic improvement of various properties, has high room-temperature ionic conductivity and a wide electrochemical stability window, is improved in air stability and is good in mechanical property.

The application discloses a kind of solid electrolyte material and its preparation method, positive pole piece, solid electrolyte film and full solid battery, it is related to solid battery field;Method comprises: lithium lanthanum zirconium oxygen base solid electrolyte is dispersed in first solvent, and electrolyte dispersion liquid is made;Acidic pH regulator is added to the electrolyte dispersion liquid, and the pH of the electrolyte dispersion liquid is adjusted to 7~8, and neutral dispersion liquid is obtained;Orthosilicate is added to the neutral dispersion liquid and mixed to obtain dispersion solution;During mixing process, polysiloxane is formed by the reaction of orthosilicate, and polysiloxane is coated on the surface of lithium lanthanum zirconium oxygen base solid electrolyte;The dispersion solution is subjected to electrolyte separation and drying treatment to obtain a solid electrolyte material.The application aims to improve the surface properties of lithium lanthanum zirconium oxygen base solid electrolyte, so that it can build good interface contact with other inorganic materials.

The invention discloses a battery fiber of an ultraviolet curing electrolyte as well as a preparation method and application of the battery fiber. The battery fiber comprises an electrode fiber core, a gel electrolyte layer and a polymer encapsulation layer from inside to outside. The electrode fiber core is formed by twisting and compounding a positive electrode fiber and a negative electrode fiber; the gel electrolyte layer is formed by curing a precursor containing a photocuring monomer, a photoinitiator, a linear polymer and a lithium salt through ultraviolet irradiation. According to the preparation method, a stable gel electrolyte layer is rapidly constructed on the surface of the fiber at normal temperature through an ultraviolet curing technology, so that the potential safety hazard that a traditional liquid electrolyte is easy to leak is solved, an electrode-electrolyte interface is also remarkably optimized, and the interface impedance is reduced. The obtained battery fiber has excellent flexibility, high safety and good electrochemical performance, the slender one-dimensional form of the battery fiber can be directly woven into an intelligent fabric through a textile technology, and an ideal flexible embedded power supply solution is provided for wearable electronic equipment.

The invention provides a lithium metal composite negative electrode, a preparation method thereof and a solid-state battery. The lithium metal composite negative electrode is of a multi-layer structure and sequentially comprises a current collector, a buffer binding layer, an active substance layer and an interface enhancement layer, the buffer binding layer is a conductive buffer material layer, the active substance layer is a lithium metal and / or lithium alloy layer, and the interface enhancement layer is a lithium metal and / or lithium alloy layer. The interface enhancement layer is a layer which contains an MOFs material, a lithium salt and an organic polymer material and has a three-dimensional porous structure. In the interface enhancement layer, an organic polymer material improves the surface mechanical strength of the negative electrode, improves the ionic conductivity and inhibits lithium metal expansion; the MOFs has a three-dimensional porous structure and can store a large number of lithium ions, accelerate ion conduction, regulate and control uniform deposition of metal lithium on the surface of the negative electrode and effectively inhibit growth of lithium dendrites on the surface of the negative electrode. The interface enhancement layer improves the compatibility between the lithium metal and the solid electrolyte, reduces the generation of side reactions, improves the cycle performance of the metal lithium solid-state battery and prolongs the service life of the metal lithium solid-state battery.

This invention discloses a novel in-situ solid electrolyte and its preparation method, comprising: mixing precursor A and precursor B, and carrying out a hydrolysis-condensation reaction under the action of a catalyst to obtain a POSS-based curing agent with R1 and R2 groups; in an inert environment, sequentially mixing the POSS-based curing agent, a double lithium salt, an organic solvent, and an initiator to obtain a precursor liquid; injecting the precursor liquid into a battery casing and allowing it to stand and soak, so that the precursor solution can fully penetrate the electrode pores; heating the battery after liquid injection at 45-80°C for 4-24 hours to initiate the polymerization and cross-linking of the R2 groups to form a three-dimensional network, and the R1 groups undergo microscopic phase separation to repel the electrolyte phase, constructing ion transport channels in the POSS cross-linked network, while the POSS framework adsorbs and fixes anions, thus forming a solid electrolyte in situ; improving the rate performance of the battery and effectively eliminating the risk of lithium dendrite precipitation under low-temperature fast charging conditions.

This application provides a method for preparing a positive electrode active material, the positive electrode active material, a battery, and a device, relating to the field of battery technology. The preparation method includes: mixing a positive electrode active material precursor with a lithium source to prepare a first mixture; mixing the first mixture with a phosphorus source to prepare a second mixture; and calcining the second mixture under an oxygen atmosphere to form a core in the first mixture, and reacting the phosphorus source with residual alkaline compounds on the surface of the core to form a coating layer, thereby obtaining the positive electrode active material. The positive electrode active material includes a core and a coating layer disposed on the surface of the core. The core includes a lithium-doped transition metal oxide, and the coating layer includes lithium phosphate. The embodiments of this application can reduce the content of residual alkaline compounds in the positive electrode active material, reduce side reactions between the positive electrode active material and the electrolyte, improve the ion conductivity of the positive electrode active material, and extend the cycle life of the battery.

The application discloses a battery and a manufacturing method thereof, and the battery comprises a positive current collector layer, which is a composite structure with dense normal layers and porous functional layers alternately distributed formed on an aluminum foil substrate through electric field assisted selective etching, a positive electrode sheet coated with positive active material aluminum powder and subjected to formation treatment, and a top cover assembly and a bottom cover assembly connected with the positive and negative electrodes through full-tab cross-section laser welding and full-tab end face laser welding respectively; the manufacturing method comprises the steps of preparing a composite positive current collector layer, coating active material, assembling a battery cell, laser welding and packaging, etc. The specific surface area and ion transmission efficiency are greatly improved through the composite current collector layer structure, the internal resistance and temperature rise are reduced by combining the optimized full-tab welding process, so that the rate performance, cycle stability and thermal safety of the battery are significantly improved, and the battery is suitable for the manufacturing of high-power long-life batteries such as electric vehicles and energy storage systems.

The application belongs to the technical field of lithium batteries, and provides an organic-inorganic compound thick electrode, a preparation method and application thereof. The organic-inorganic compound thick electrode comprises a current collector and an active coating. The active coating comprises an active material, a composite conductive agent and a composite binder. The active material is SPAN and LVP. SPAN endows the electrode with high specific capacity characteristics, and can significantly improve the energy density of the battery. LVP effectively compensates for the defects of SPAN in conductivity and structural stability due to its excellent crystal structure stability, high ionic conductivity and nearly zero volume change in the cycle process. Through the synergistic compound design of organic-inorganic materials, the advantages of the two materials are complementary and synergistic, which not only solves the kinetic bottleneck of SPAN, but also strengthens the structural stability of the thick electrode, and further constructs a new electrode system with high energy density, long cycle life and excellent rate performance.

This invention relates to the field of solid-state electrolyte battery technology, specifically to a 4D-printed gel solid-state electrolyte, a printing method, and a solid-state battery. This application utilizes 3D printing technology to pre-construct a solid-state electrolyte composed of an insoluble polymer framework and a soluble polymer functional phase. When a trace amount of electrolyte is introduced, this structure undergoes a predetermined, controllable evolution over time—the soluble components rapidly dissolve and gel in situ, dynamically coating the surface and pores of the insoluble framework, thereby forming a gel electrolyte that combines a stable three-dimensional framework with a high ionic conductivity gel interface layer. This achieves a 4D-printed gel solid-state electrolyte. This 4D-printed gel solid-state electrolyte effectively buffers volume changes and significantly reduces interfacial impedance. Simultaneously, its insoluble framework ensures mechanical strength and dimensional stability, while the extremely low electrolyte usage fundamentally improves battery safety and cycle performance.

The invention provides an interface buffer material, a secondary battery and an electric device, and relates to the technical field of electrochemical energy storage materials. The interface buffer material disclosed by the invention comprises Ti < 3 > C < 2 > T < x > MXene and an inorganic ceramic layer coated on the surface of the Ti < 3 > C < 2 > T < x > MXene, the inorganic ceramic layer includes an oxysalt layer and a non-oxide layer. When the interface buffer material is applied to the solid-state battery, the cycling stability of the solid-state battery can be improved, and the interface impedance of the solid-state battery can be reduced.

The application provides a pore-forming agent for lithium ion batteries and a preparation method thereof, which comprises a wall material preparation step, a core material preparation step, a W / O type initial milk preparation step and a pore-forming agent for lithium ion batteries preparation step. The pore-forming agent preparation method is a new pore-forming agent synthesis route, which has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and environmental protection. The technology can accurately construct a uniform multi-level pore network by introducing the pore-forming agent into the electrode, significantly reduces the charge transmission impedance, effectively improves the fast charging capacity and high-rate discharge performance of the battery, greatly improves the electrode-electrolyte interface contact, and ensures the full use of the active material. The application also provides an application of the pore-forming agent for lithium ion batteries to lithium ion batteries. The application of the pore-forming agent for lithium ion batteries to the lithium ion batteries can improve ion conduction and improve the rate performance.

Disclosed are a solid-state electrolyte-lithium assembly, a preparation method thereof, and a solid-state lithium battery comprising the same. The solid-state electrolyte-lithium assembly comprises: a solid-state electrolyte having a first major surface and an opposite second major surface, wherein at least the first major surface has a plurality of uniformly sized holes arranged in an array form, the spacing between adjacent holes is no more than 10 microns, the distribution density of the holes is 10 5 ‑10 9 cm 2 −1, and the depth of the holes does not penetrate to the opposite surface; and a layer of metallic lithium or lithium alloy compounded on the first major surface, the metallic lithium or lithium alloy filling the holes on the first major surface and forming a layer with a thickness of 1-100 microns on the first major surface. The solid-state electrolyte-lithium assembly of the present application can greatly reduce the interface impedance between the solid-state electrolyte and the metallic lithium.

The invention provides a sodium-ion battery electrolyte and a sodium-ion battery, and relates to the technical field of electrolytes. According to the sodium-ion battery electrolyte disclosed by the invention, the cyclic siloxane compound and the bicyclic sulfate compound of which at least one silicon atom is simultaneously connected with alkenyl and phenyl are added as electrolyte additives, so that the thermal stability of a sodium-ion battery is improved, and meanwhile, the interface impedance of the battery can be prevented from being increased; therefore, the obtained sodium ion battery has high-temperature stability and low interface impedance.

This invention discloses a solid-state electrolyte and a solid-state battery for the field of backup power and energy storage, belonging to the field of battery manufacturing technology. The solid-state electrolyte for backup power and energy storage comprises the following components by weight: 30-40 parts polymer matrix, 18-30 parts lithium salt, 0.8-1.3 parts lithium salt promoter, 1-4 parts binder, 18-26 parts tetrahydrofuran, and 0.8-2.3 parts conductive additive. The solid-state electrolyte prepared using the above substances exhibits excellent ionic conductivity, electrochemical stability, and safety, and its parameters are suitable for backup power and energy storage applications.

The invention relates to the technical field of batteries, in particular to a wide-temperature-range high-rate lithium battery ester-based electrolyte and application. The electrolyte comprises soluble lithium salt and a liquid component, the liquid component is a solvent; the solvent comprises at least three of propylene carbonate, fluoroethylene carbonate, isopropyl trifluoroacetate, ethyl trifluoroacetate, ethyl acetate, methyl acetate and methyl trifluoroacetate; the lithium salt lithium battery comprises at least two of common lithium salts. The electrolyte developed by the invention is used in the lithium battery and can stably work at 40-60 DEG C, the specific discharge capacity of the battery is still 62.83% of the specific discharge capacity of the battery at room temperature even at 30 DEG C and 4C multiplying power, and the electrolyte has excellent wide-temperature fast charge performance. In addition, the electrolyte effectively inhibits the growth of lithium dendrites and the side reaction of an electrode-electrolyte interface at low temperature, and promotes the formation of a solid interface film which is rich in inorganic matters and low in interface impedance. The invention has the advantages of reasonable component design and excellent product performance, and is convenient for industrial application.

The invention provides a negative electrode material and a battery, the negative electrode material comprises an inner core and a coating layer located on at least part of the surface of the inner core, the inner core comprises graphite, the coating layer comprises a polymer, and the negative electrode material comprises at least one of an element N, an element S and an element P; the repose angle of the negative electrode material is theta degrees, the tap density of the negative electrode material is rho g / cm < 3 >, the compaction density of the negative electrode material under the pressure of 5T is T1 g / cm < 3 >, and the negative electrode material meets the formula: M = theta / rho * T1, and M is more than or equal to 105 and less than or equal to 160. According to the negative electrode material provided by the invention, the negative electrode material has high capacity, high compaction density and low expansion performance, and the fast charging performance of the negative electrode material is improved.

The application discloses a sulfide solid electrolyte, a preparation method thereof and a super capacitor. The sulfide solid electrolyte comprises an organic-inorganic composite film generated by a curing reaction of a raw material system. The raw material system comprises a first monomer, a second monomer, a lithium salt, a siloxane prepolymer and an initiator. The first monomer is N,N'-1,3-propanediyl bis(oxazolidine 2-ketone), and the second monomer is 4,4'-thiobisphenol diglycidyl ether. The application is based on the composite system sulfide solid electrolyte of N,N'-1,3-propanediyl bis(oxazolidine 2-ketone) and 4,4'-thiobisphenol diglycidyl ether, and the modification of the siloxane prepolymer and the optimized process parameters, so that the defects of the prior art can be effectively solved.

The invention relates to a gradient piezoelectric buffer layer, a preparation method and a solid-state battery. The gradient piezoelectric buffer layer comprises a sodium bismuth titanate nanoparticle coating layer, a lithium phosphate ion conduction layer and a PVDF-ZnO composite electrolyte layer which are arranged in a stacked mode. The preparation raw materials of the sodium bismuth titanate nanoparticle coating layer comprise a sodium source, a bismuth source, a titanium source, a mineralizer and a ternary positive electrode material. According to the invention, a three-layer structure of piezoelectric buffer layer-ion conduction layer-piezoelectric composite electrolyte is constructed, the volume change of the electrode is dynamically compensated by using the inverse piezoelectric effect of the piezoelectric material, and stress regulation and ion transmission are synchronously realized. Compared with a traditional passive buffering strategy, the method has the advantages that the interface impedance can be reduced, the cycling stability is remarkably improved, and technical support is provided for industrialization of high-energy-density (greater than or equal to 400Wh / kg) solid-state batteries.

The invention relates to the technical field of batteries, in particular to an integrated lithium metal negative electrode and a preparation method thereof, a lithium metal battery and a power utilization device, and the integrated lithium metal negative electrode comprises a porous polymer film, a conductive polymer layer, a lithium-loving substance layer and a lithium metal layer which are sequentially stacked in the thickness direction; materials of the conductive polymer layer comprise a fluorine-containing polymer, a conductive agent and a lithium supplement agent. The integrated lithium metal negative electrode is provided, and the high-stability lithium metal battery is constructed through multi-stage protection of physical blocking, stress buffering and lithium deposition induction.