31results about How to "Lower nucleation overpotential" patented technology

The invention provides a surface dendrite-free high-safety metal lithium anode and a preparation method and application thereof, which relate to the technical field of battery electrode material preparation. Due to the inherent thermodynamic and kinetic tendency of the growth of lithium metal dendrites, lithium dendrites cannot be completely avoided in the long-term cycling process. Therefore, unlike the traditional method of inhibiting the growth of lithium dendrites with great efforts, in order to ensure the safety of lithium metal batteries, the invention explores another way to control thegrowth direction of lithium metal to design and develop surface dendrite-free metal lithium anodes, so as to fundamentally solve the battery short circuit caused by lithium dendrites and the safety problem caused by the lithium dendrites. The lithium metal anode prepared by the invention has smooth surfaces and no dendrite in the cycle process, has high cycle coulomb efficiency and cycle stability, and has extremely industrialized application prospect and practical application value.

The invention discloses a lithium metal composite negative electrode with a lithium-philic and lithium-phobic gradient structure, and a preparation method thereof. The lithium metal composite negativeelectrode is of a three-layer structure, wherein the bottom layer is a 3D porous matrix framework, the middle layer is a lithium-philic layer compounded on the 3D porous matrix framework, and the toplayer is a lithium-phobic layer compounded on the surface of the lithium-philic layer. The preparation method comprises the following steps: (1) preparing a 3D porous matrix skeleton, and cleaning; (2) transferring the 3D porous matrix skeleton to a prepared precursor solution; (3) forming a lithium-philic layer on the 3D porous matrix skeleton in situ by adopting a solvothermal method; (4) modifying a lithium-phobic layer on the lithium-philic layer; and (5) finally filling with lithium by adopting an electro-deposition method. According to the invention, the overpotential in the lithium metal nucleation and deposition process can be reduced by utilizing the lithium-philic layer, and the uniform deposition and dissolution of the lithium metal in the continuous cycle process are realizedby utilizing the characteristic that the lithium ion diffusion is promoted by utilizing the lithium-phobic layer, so that the growth of dendritic crystals is effectively avoided, and the cycle life ofthe lithium metal battery is greatly prolonged.

The invention discloses a preparation method of a three-dimensional conductive skeleton / metal nitride composite lithium metal negative electrode current collector, which is used for solving the technical problem of poor practicability of the existing preparation method of the lithium metal negative electrode current collector. According to the technical scheme, a precursor with a specific nanostructure grows on a three-dimensional conductive skeleton by using a hydrothermal synthesis method, and the nitride-modified three-dimensional conductive skeleton current collector is obtained through high-temperature nitridation. The conversion reaction between the metal nitride and the lithium metal endows the three-dimensional skeleton with excellent lithium affinity, so that uniform deposition / stripping of lithium is induced, and meanwhile, the conductive skeleton with the spatial three-dimensional structure effectively alleviates the problem of volume expansion of the lithium metal in the circulation process. The synergistic effect of the two protects the stability of a solid electrolyte membrane and effectively inhibits the growth of lithium dendrites. The lithium metal negative electrode of the three-dimensional current collector prepared by the method has excellent coulombic efficiency, ultra-long cycle life, low voltage lag and good practicability.

The invention belongs to the field of metal lithium battery negative electrode materials, and particularly discloses a lithium ion battery negative electrode and a preparation method thereof. The lithium ion battery negative electrode comprises a substrate and a modified material, wherein the substrate is elemental copper, and the modified material is a chalcogenide copper compound generated in situ on the surface of the elemental copper. The preparation method of the lithium ion battery negative electrode comprises the following steps: putting elemental copper into a reactor, heating, introducing chalcogenide powder into the reactor through purge gas, and enabling the chalcogenide powder to react with the elemental copper, so that a uniform chalcogenide copper compound is generated on thesurface of the elemental copper in situ so as to complete the preparation of the lithium ion battery negative electrode. According to the invention, the problem of uneven deposition of lithium ions in a lithium ion battery is solved, the cycling stability of the lithium ion battery is improved, the nucleation overpotential of the lithium ions can be reduced, and nucleation of the lithium ions isfacilitated.

The invention discloses a preparation method of a composite lithium metal negative electrode with a three-dimensional structure and a product of the composite lithium metal negative electrode. An inherent pore structure of carbon fiber cloth taking thin-crystal graphite flakes as pore walls not only can relieve volume change in a lithium deposition / dissolution process, but also can introduce a lithium storage mechanism through a lithium insertion / extraction path; and meanwhile, the carbon cloth has light weight and good flexible mechanical properties, and can inhibit the growth of lithium dendrites. In the lithium electrochemical deposition process, the metal lithium and the cobalt fluoride are subjected to an irreversible reduction reaction to form cobalt nanoparticles and the lithium fluoride; the cobalt nanoparticles have smaller binding energy with the lithium metal, so that nucleation sites can be increased, the nucleation overpotential of the lithium metal is reduced, and uniform diffusion of lithium ions is promoted. The lithium fluoride formed in situ has good interface contact with the carbon fiber cloth, has high mechanical modulus, high chemical stability and high interface energy with lithium, and can uniformize lithium ion flux and effectively inhibit dendritic crystal growth of lithium.

The invention discloses an aqueous zinc ion battery negative electrode, a preparation method and a battery. The method comprises the steps of (1) dropwise adding a silver nanowire suspension onto a battery negative electrode substrate, wherein the substrate is a zinc sheet; and (2) drying the substrate dropwise added with the silver nanowire suspension to obtain the aqueous zinc ion battery negative electrode, wherein the silver nanowires on the battery negative electrode and the zinc sheet substrate are subjected to alloying reaction in an electrochemical cycle process to form an AgZn3 alloy layer taking the silver nanowires as a three-dimensional substrate. According to the invention, the nucleation overpotential of zinc in the battery cycle process is successfully reduced, the corrosion resistance of the negative electrode is improved by utilizing the stability of the silver-zinc alloy layer to zinc and the isolation effect of the silver-zinc alloy layer to electrolyte, and meanwhile, the impedance and polarization of the battery can be greatly reduced due to the good conductivity of silver, so that the problems of dendritic crystal growth and corrosion in the zinc negative electrode are solved, and the electrochemical performance of the battery is improved.

The invention discloses a preparation method and application of less-fluorite porous titanium carbide MXene. According to the method, Ti3AlC2 is dissolved in concentrated hydrofluoric acid, and cleaning and drying are carried out after magnetic stirring so as to obtain powder A; the powder A is dispersed in sodium hydroxide solution, and cleaning and drying are carried out after magnetic stirringso as to obtain powder B; the powder B is dispersed in deionized water to obtain solution, the solution is transferred into a high-pressure reactor to be placed in a constant-temperature dryer for constant-temperature drying, and cleaning and drying are carried out to obtain powder C; and the powder C is dispersed in diluted hydrofluoric acid, and cleaning and drying are carried out after magneticstirring so as to obtain the less-fluorite porous titanium carbide MXene. The less-fluorite porous titanium carbide MXene provided by the invention is applied to working electrode materials of lithium metal batteries to express relatively low nucleation overpotential and excellent cycle stability, is capable of effectively inhibiting the growth of lithium dendrites, and has excellent applicationprospect in low-cost high-performance lithium metal batteries.

The invention relates to a carbon nanosphere containing single atom Fe and a preparation method thereof and application. The method comprises the following steps: (a) pyrrole is added to water, polymerization is conducted under effects of an iron-containing catalyst and an oxidizing agent, and a polypyrrole spherical dispersion is obtained; (b) the polypyrrole spherical dispersion is dried to obtain a Fe-containing nanosphere precursor; and (c) the Fe-containing nanosphere precursor is placed in an inert atmosphere for calcination and carbonization. A simple and template-free method is used to synthesize a single atom Fe-containing nitrogen-doped carbon nanosphere material, the nucleation overpotential of lithium dendrites can be reduced due to the existence of the single atom Fe, the lithium dendrites are made for uniform nucleation on the surface of a negative electrode, and growth of the lithium dendrites is suppressed; and on the other hand, with the carbon nanosphere structure, the mechanical tension generated by volume expansion can be well blended, and the electrochemical integrity of the structure is kept.

The invention provides a composite lithium metal negative electrode and a preparation method thereof, and belongs to the technical field of lithium metal batteries. The composite lithium metal negative electrode comprises metal lithium and a lithium-philic composite framework material; wherein the lithium-philic composite framework material comprises a metal framework material, metal heterogeneousparticles and a reduced graphene oxide material. According to the method, the graphene oxide is reduced through ionothermal, the interlayer spacing of the reduced graphene oxide is enlarged, and thespace for accommodating lithium is increased; after a metal precursor and a reducing agent are added, the metal heterogeneous particles grow on the reduced graphene oxide layer in situ, so that the lithium nucleation overpotential is reduced; and lithium is uniformly deposited on the lithium-philic composite framework material through an electrochemical deposition method to form a composite lithium metal negative electrode. The obtained composite lithium metal negative electrode is simple in preparation process and can effectively inhibit growth of lithium dendrites, so that the service life of a lithium metal negative electrode battery is greatly prolonged, and the cycling stability of the lithium metal negative electrode battery is greatly improved.

The invention discloses a preparation method of a lithium battery with a Pd-Cu net / lithium metal composite material electrode. A composite material prepared from palladium and a copper net is used asa three-dimensional current collector, so that growth of lithium dendrites can be inhibited, and manufacturing of the lithium battery with long service life is realized. A composite material preparedfrom Pd and a copper net on the negative electrode of a lithium metal-based battery is used as a three-dimensional current collector, so that the growth of negative electrode lithium dendrites can beeffectively inhibited, and the cycle life of the battery is prolonged. Metal lithium serves as the negative electrode of the lithium battery and has ultrahigh theoretical specific capacity and lowestreduction potential, but growth of uncontrollable lithium dendrites can cause internal short circuit of the battery, so that the battery fails and potential safety hazards are caused. Through electroplating replacement reaction, Pd nanoparticles can be simply and quickly modified on the surface of the copper net, and the prepared Pd-copper mesh has a quite large surface area; Pd atoms in the Pd-copper net can be combined with Li and have very high affinity with Li, so that the growth of lithium dendrites can be effectively inhibited.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium metal negative electrode deposition substrate and a preparation method and application thereof. The preparation method of the sodium metal negative electrode deposition substrate comprises the following steps: preparing porous graphene, and then preparing a sodium metal deposition matrix by a blade coating method or a rolling method. The sodium metal negative electrode deposition substrate provided by the invention is a deposition substrate based on porous graphene, has a large specific surface area, can effectively reduce local current density and homogenize sodium ion flow, has rich oxygen-containing functional groups, and can increase surface's sodium affinity, so that uniform nucleation anddeposition of sodium are guided. The formation of sodium dendrites is effectively inhibited, and excellent performance is shown in tests of half cells and symmetrical cells.

The invention belongs to the technical field of composite material preparation, and relates to a self-assembled MXene / chitosan composite membrane as well as a preparation method and application thereof. The composite membrane is formed by stacking layered MXene nanosheets layer by layer, and the surfaces of the layered MXene nanosheets are coated with chitosan in a self-assembled mode. The high regularity of the composite membrane is realized by utilizing self-assembly of the chitosan on the surfaces of MXene nanosheets and weakening stacking among the nanosheets, the composite membrane is directly used as a current collector of a lithium ion battery, and metal plane deposition is induced by utilizing high conductivity of the composite membrane and a large number of surface metal affinity groups (hydroxyl, amido and the like), so that dendritic crystal growth in the operation process of the battery is inhibited, so that safe, stable and efficient operation of the metal negative electrode secondary battery is ensured. Chitosan is used as natural green polysaccharide and is safe and environmentally friendly, and the preparation method of the composite membrane is simple and controllable and is suitable for expanded production.

The invention relates to a preparation method of hollow carbon spheres with through mesopores and a composite sodium metal negative electrode thereof, tetrapropyl orthosilicate, ammonia water, ethanol, deionized water, formaldehyde and resorcinol are used as raw materials, the steps of silicon source decomposition, phenolic resin polymerization, carbonization, etching and the like are performed, the obtained hollow carbon spheres have larger cavities, and the carbon shells have obvious through mesoporous structures. When the hollow carbon sphere with the through mesoporous structure provided by the invention is used for a sodium metal battery negative electrode material, nano packaging of sodium metal can be efficiently realized, so that generation of sodium dendrites is inhibited, volume change in a sodium metal deposition / stripping process is limited, an interfacial film is stabilized, and the hollow carbon sphere can be used as an ideal carbon-based current collector material of a sodium metal negative electrode; further, the method is used for constructing a safe sodium metal battery with high coulombic efficiency and long service life.

In order to overcome the problem of low lithium affinity of an existing porous skeleton, the invention provides a porous current collector. The current collector comprises a conductive porous skeleton, a plurality of micropores are formed in the conductive porous skeleton, and copper oxide layers are formed on the surface of the conductive porous skeleton and the inner walls of the micropores. Meanwhile, the invention also discloses a preparation method of the porous current collector, a lithium negative electrode and a lithium ion battery. According to the porous current collector provided bythe invention, the specific surface area of the conductive porous skeleton is increased, and meanwhile, the nucleation overpotential of lithium deposition is effectively reduced, so that lithium is uniformly deposited on the surfaces of micropores of the conductive porous skeleton in the embedding process, and the generation probability of lithium dendrites is reduced.

The invention belongs to the field of secondary lithium metal batteries, and more specifically relates to a composite lithium metal negative electrode and a preparation method thereof. The preparation method of the present invention comprises the following steps: (1) preparing conductive metal nanowire ink, immersing a metal mesh in the metal nanowire ink, taking out the metal mesh and drying to obtain a metal mesh loaded with conductive metal nanowire; 2) placing the metal mesh loaded with the conductive metal nanowires flat on the metal lithium foil, rolling by a roller press, and removing the metal mesh to obtain a composite lithium metal negative electrode. In the present invention, the metal mesh is used to press the array channel pattern on the metal lithium foil. On the one hand, the mechanical strength of the metal mesh is greater than that of lithium, and it is easy to carry out effective rolling to construct the channel. Compared with the flat lithium foil, the obtained composite lithium metal negative electrode has extremely Low polarization voltage and excellent cycle stability have great application value in the field of lithium metal secondary batteries.

The invention relates to a lithium-loving carbon skeleton composite material which comprises a three-dimensional network structure, and the three-dimensional network structure layer contains a lithium-loving material. The lithium-loving material is distributed in the through holes of the three-dimensional network structure; the three-dimensional network structure layer is a carbon skeleton formed by graphitizing a fibrous carbon nanomaterial. According to the lithium-loving carbon skeleton composite material, nucleation overpotential can be reduced, lithium deposition sites can be optimized, lithium metal can be attracted to be deposited in a three-dimensional structure network, volume expansion of metal lithium and generation of lithium dendrites in the circulation process are avoided, contact between an electrolyte and the lithium metal is isolated, side reactions are reduced, and the circulation performance of the material is optimized.

The invention discloses an electrolyte and application thereof. The electrolyte comprises an electrolyte, a solvent and an additive, the additive comprises a dopamine compound. When the electrolyte is used as the electrolyte of the aqueous zinc-based battery, the dopamine can regulate and control zinc ion deposition dissolution kinetics, and the zinc ion nucleation overpotential is effectively reduced; meanwhile, in the charging and discharging process of the battery, a polydopamine film layer can be formed on the surface of zinc metal in an in-situ self-polymerization manner, and the effects of preventing passivation corrosion of a zinc negative electrode and stabilizing the zinc deposition and dissolution process are achieved, so that the stability of the zinc negative electrode is improved, and the interface impedance is reduced.

The invention relates to a multi-layer lithium metal battery negative electrode and a preparation method and preparation equipment thereof. The multi-layer lithium metal battery negative electrode comprises a current collector, a lithium metal layer, a fast ion conductor layer and a functional protection layer. The invention also relates to a preparation method of the multilayer lithium metal battery negative electrode, which is characterized by comprising the following steps: (1) lithium metal evaporation; (2) fast ion conductor evaporation; and (3) a protective substance and polymer solid electrolyte coating step. In addition, the invention relates to equipment for preparing the multilayer lithium metal battery negative electrode. According to the multi-layer lithium metal battery negative electrode disclosed by the invention, the composite synergistic effect of the lithium metal layer, the fast ion conductor layer and the functional protection layer is utilized, so that the cycle performance, the cycle life and the safety of the lithium metal battery are obviously improved, and the problem of lithium dendrites in the lithium metal negative electrode is solved.

The invention discloses application of a nitrogen-poor g-C3N4 loaded Mg3N2 composite material as a negative electrode material and a lithium-based battery, wherein the loading capacity of Mg3N2 in the nitrogen-poor g-C3N4 loaded Mg3N2 composite material is between 22 wt.% and 45 wt.%. The preparation method of the nitrogen-poor g-C3N4 loaded Mg3N2 composite material comprises the following steps: mixing a raw material g-C3N4 with magnesium powder to obtain a precursor; and calcining the precursor under the protection of inert gas to obtain the nitrogen-poor g-C3N4 loaded Mg3N2 composite material. According to the invention, based on the synergistic effect of Mg3N2 and graphene-shaped nitrogen-deficient g-C3N4, the graphene-shaped nitrogen-deficient g-C3N4 loaded Mg3N2 battery negative electrode material enables nucleation overpotential during lithium metal deposition to be remarkably reduced, the cycling stability is remarkably improved, and the graphene-shaped nitrogen-deficient g-C3N4 loaded Mg3N2 battery negative electrode material has potential application prospects in the technical field of lithium metal batteries.

The invention discloses a lithium metal battery negative electrode and a preparation method thereof, belongs to the technical field of battery energy, and aims to construct a lithium-loving layer on the surface of a copper current collector, reduce the nucleation overpotential during lithium metal deposition, improve the polarization condition of an electrode, improve the reversibility of electrode reaction in the battery and prolong the service life of the lithium metal battery. The negative electrode of the lithium metal battery used in the invention is a composite current collector modified with a lithium-loving layer; the preparation method comprises the following steps: firstly, placing a cleaned copper foil in a muffle furnace by adopting an air oxidation method to oxidize, forming an oxide layer on the surface of a current collector, then modifying the oxidized copper current collector by utilizing a thermal diffusion method by virtue of the volatility of lithium oxide, finally obtaining the composite current collector, and assembling the battery to test the electrochemical performance of the battery. The result shows that lithium is stably and uniformly deposited on the surface of the electrode, and the cycle life and coulombic efficiency of the lithium metal battery are greatly improved.

The invention discloses a preparation method and application of less-fluorine porous titanium carbide meconene. The method is: Ti 3 AlC 2 Dissolve in concentrated hydrofluoric acid, wash and dry after magnetic stirring to obtain powder A; disperse powder A into sodium hydroxide solution, wash and dry after magnetic stirring to obtain powder B; disperse powder B in deionized water to obtain solution, transfer the solution to a high-pressure reactor and place it in a constant temperature drying box, wash and dry after constant temperature drying to obtain powder C; 4) disperse powder C in dilute hydrofluoric acid, wash and dry after magnetic stirring, A less fluorine porous titanium carbide meconene was obtained. The less-fluorine porous titanium carbide miconene provided by the present invention is applied to the working electrode material of lithium metal batteries, exhibits low nucleation overpotential and excellent cycle stability, and can effectively inhibit the growth of lithium dendrites. It has excellent application prospects in cheap and high-performance lithium metal batteries.

The invention discloses a method for preparing a nickel nitride-nickel foam composite lithium metal negative electrode current collector, which comprises the following steps: 1) preparing a foam nickel material of required specifications, cleaning and drying it for use; 2) making step 1) The cleaned and dried nickel foam is placed in a discharge plasma reaction furnace, and then the reaction furnace is evacuated and the reaction gas is continuously introduced; 3) the discharge generates plasma to bombard the foam nickel, and the reaction temperature and reaction time are controlled. Reaction generates nickel nitride layer, obtains described nickel nitride-nickel foam composite lithium metal negative electrode current collector. The invention utilizes the etching effect of plasma and the high chemical activity of nitrogen-containing particles to form a layer of lithium-friendly nickel nitride on the surface of nickel foam. During the charging and discharging process of the battery, the nickel nitride reacts with lithium to promote lithium The metal is uniformly deposited, and the preparation process is easy to control. The obtained negative electrode current collector has a three-dimensional structure, and the electrochemical performance is significantly improved.

The invention discloses a lithium metal battery cubic hole carbon coating separator and a preparation method thereof, belonging to the technical field of battery materials. The coating material of the lithium metal battery coating diaphragm provided by the present invention has a nano-sheet structure and has cubic holes, and the cubic holes are surrounded by carbon walls; the cubic holes are uniform in size, with a side length of 20-28nm, and are closely stacked arrangement. The coating material is obtained from carbon-containing organic matter through carbonization and then removing templates. The coating material of the invention has good electrolyte wettability, improves the utilization efficiency of the electrolyte, can reduce the interface impedance, and improves the rate capability of the lithium metal battery.

The invention relates to a sodium battery current collector as well as a preparation method and application thereof. According to the method, the surface of an aluminum-based current collector is modified by using room-temperature gallium-based liquid metal, the wettability of the current collector to metal sodium is improved, the nucleation overpotential of sodium is reduced, and the growth of sodium dendrites is inhibited. The method comprises the following steps that: the surface of metal aluminum is coated with a layer of room-temperature gallium-based liquid metal; and liquid metal diffusion reaction is carried out, and the sodium battery current collector is obtained. According to the sodium battery current collector as well as the preparation method and application thereof of the invention, the gallium-based liquid metal is applied on the surface of the metal aluminum, and an aluminum gallium alloy layer with sodium affinity is spontaneously formed on the surface of the metal aluminum, so that the nucleation overpotential of the metal sodium is reduced, the growth of the sodium dendrites is inhibited, the cycling stability of a sodium battery is improved, the service life of the sodium battery is prolonged, and the coulombic efficiency of the sodium battery is improved.

The invention provides a carbonic ester electrolyte additive and application thereof. The additive is phenyl sulfur pentafluoride and isomer or derivative thereof. The invention also provides a carbonic ester electrolyte containing the additive and a lithium metal total battery. The electrolyte additive can effectively guide ordered deposition of Li < + > and reduce nucleation overpotential and polarization, so that growth of lithium dendrites is inhibited, a flat and smooth lithium metal surface is obtained, and short circuit is avoided.

The invention belongs to the field of metal lithium battery negative electrode materials, and specifically discloses a lithium ion battery negative electrode and a preparation method thereof. The lithium ion battery negative electrode includes a base and a modified material, wherein the base is copper simple substance, and the modified The material is a chalcogen copper compound generated in situ on the surface of the copper element. The preparation method of the negative electrode of the lithium ion battery comprises the following steps: the copper element is placed in the reactor and heated, and then the chalcogenide powder is passed into the reactor through the purge gas, and the chalcogenide powder reacts with the copper element, The uniform chalcogen copper compound is generated in situ on the surface of the copper element, and the preparation of the negative electrode of the lithium ion battery is completed. The invention solves the problem of uneven deposition of lithium ions in the lithium ion battery, improves the cycle stability of the lithium ion battery, and can reduce the nucleation overpotential of lithium ions at the same time, which is beneficial to the nucleation of lithium ions.

The invention discloses a gas phase synthesis method of a lithium metal negative electrode porous Zn current collector with controllable thickness, and relates to a lithium metal battery. The distancebetween a target material and a substrate is increased before the target material is sputtered by adopting a plasma magnetic control sputtering method; the target material is installed, a radio frequency power supply is connected, the substrate is fixed to a vacuum chamber indoor substrate, and vacuumizing is carried out; a flow meter and a molecular pump are adjusted to enable gas Ar to enter achamber, the power supply is turned on to adjust the power, and pre-sputtering is started; the deposition rate of a porous thin film is measured through a scanning electron microscope, the porous thinfilm is directly deposited on a silicon wafer to test the sizes and shapes of nano particles, and the porous thin film is directly deposited on a copper sheet to serve as a lithium metal negative electrode current collector assembled semi-battery, and the coulombic efficiency of the lithium metal negative electrode current collector assembled semi-battery is tested; and a porous metal Zn thin film is used as a working electrode, lithium metal is used as a reference and counting electrode, and a polypropylene diaphragm is used as a diaphragm. A prepared porous lithium metal film has the advantages of being not restrained by the melting point and hardness of materials, simple in process, high in yield and the like, and is suitable for scientific research and large-scale production.

Cu 3 Pt copper mesh-lithium metal electrode and its preparation method and lithium battery preparation method, including that the electrode is a three-dimensional porous frame structure, and the electrode includes Cu 3 Pt copper mesh and lithium metal foil; the lithium metal foil is fully embedded in the Cu3Pt copper mesh; the Cu 3 The Pt copper mesh includes Cu-based current collectors and Cu 3 Pt coating, the outer surface of the Cu-based current collector is evenly coated with the Cu 3 Pt coating; Cu 3 Pt copper mesh with ultra-rough surface; synthesis of chloroplatinic acid mixed solution; synthesis of Cu 3 Pt copper mesh; electrode preparation; the present invention can quickly and simply wrap a layer of Cu on the outer wall of the copper mesh through electroplating displacement reaction 3 Pt alloy, thus making Cu 3 Pt copper mesh has an ultra-rough surface and thus a considerable surface area; Cu 3 Pt atoms in Pt can combine with Li (i.e. Cu 3 The Pt atom in Pt can be lithiated), which has a high affinity with Li. Therefore, Cu 3 The Pt‑Cu mesh reduces the nucleation overpotential of Li metal.

The invention relates to the technical field of potassium metal batteries, in particular to a potassium metal battery negative electrode, a preparation method and application thereof and a potassium metal battery. The negative electrode of the potassium metal battery provided by the invention comprises a gold-loaded foamy copper current collector and a potassium sheet. The potassium sheet is embedded in the pore structure of the gold-loaded foamy copper current collector. According to the invention, the three-dimensional porous structure in the foamy copper current collector limits the volume expansion of the potassium negative electrode in the circulation process; gold has a low nucleation overpotential, is a preferential deposition site of potassium ions in the battery cycle process, and can make the potassium metal deposit more uniform, thereby inhibiting the growth of dendritic crystals. Therefore, the negative electrode of the potassium metal battery can remarkably reduce volume expansion of the potassium metal and inhibit growth of dendritic crystals in the cycle process, and relatively high coulombic efficiency, relatively long cycle life and excellent rate capability are realized.

The invention discloses an application of a metal material and a zinc-based battery using the metal material as a negative electrode, the metal material is used as the negative electrode of the zinc-based battery, and the metal material is a metal capable of forming a solid solution with zinc. The metal material is an alloy composed of any one or more of silver, iron, nickel, titanium, copper, tinand aluminum. Preferably, the metal material is copper or tin. The metal material disclosed by the invention can form a solid solution with zinc, reduce the nucleation overpotential of zinc deposition and accelerate zinc nucleation, so that the nucleation rate is greater than the growth rate, thereby inhibiting dendritic crystal growth, obtaining a uniform and flat deposition layer, prolonging the service life of a battery and improving the coulombic efficiency of the battery.