64results about How to "Reduce local current density" patented technology

The invention provides a composite lithium metal negative electrode, a preparation method and a lithium ion battery. The method for preparing the composite lithium metal negative electrode comprises the following steps: providing an electronic conductive framework material with a porous structure; carrying out lithium-philic modification treatment of the electronic conductive framework material; mixing the electronic conductive framework material subjected to the lithium affinity modification treatment with liquid lithium; immersing the liquid lithium into pores of the electronic conductive framework material, and performing cooling to obtain the composite lithium metal negative electrode; controlling the ratio of the volume of the liquid lithium to the total volume of the pores in the electronic conductive framework material to ensure that the porosity of the composite lithium metal negative electrode is 20-98% and lithium content of 0.01-0.01% 10mg / cm2. According to the invention, the porosity and the lithium content of the composite lithium metal negative electrode can be accurately controlled through the method, dendritic crystals are effectively prevented from being formed, and the problems of volume expansion, poor cycle performance, high safety risk and the like of the lithium metal negative electrode are solved, so that a battery applying the composite lithium metal negative electrode has high energy density and long-cycle stability.

The invention relates to a composite material for lithium cathode protection. The composite material is composed of porous metal-organic frameworks (MOF) and carbon nano fibers (CNFs), is used for lithium cathode protection, can effectively solve the problem that lithium dendritic crystals grow on the surface of a lithium cathode, improves the cycle stability of lithium cathode, and enhances the properties and safety of a secondary battery that is prepared from a lithium material.

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 discloses a composite lithium metal negative electrode based on an MXene aerogel and a synthesis method thereof, which belong to the field of lithium batteries. The composite lithium metal negative electrode comprises metal lithium and the MXene aerogel, wherein the MXene aerogel is assembled by cross-linking of two-dimensional MXene sheets and has a three-dimensional hierarchical porous structure; the MXene aerogel pores are filled with the metal lithium; and the thickness of the MXene aerogel is 300 mum to 800 mum. According to the composite lithium metal negative electrode prepared in the invention, rich pro-lithium functional groups on the surface of the MXene aerogel can be specifically combined with the lithium ions, uniform nucleation of lithium is thus realized, formation of lithium dendrites is suppressed, and the coulombic efficiency, the safety and the cycle life of the lithium metal negative electrode are effectively improved.

The invention discloses a metal electrode with a three-dimensional structure. The metal electrode comprises a substrate, wherein at least one surface of the substrate is provided with an embedded layer with a netlike structure; the substrate is selected from metal lithium, sodium, magnesium or aluminum, or an alloy consisting of at least two of the metal lithium, sodium, magnesium and aluminum; the embedded layer with the netlike structure is of a single-layer or multi-layer structure, and is selected from at least one of a metal layer, a polymer layer, a semiconductor layer and an insulator layer; the netlike structure is a planar netlike structure or a three-dimensional netlike structure; and the embedded layer is made of a material different from the material of the substrate. Through adoption of the metal electrode with the three-dimensional structure provided by the invention, the aims of restraining dendritic crystal growth and reducing volume expansion can be fulfilled, thereby increasing the coulombic efficiency of a battery and prolonging the service life the battery.

The invention belongs to the field of high-specific-energy lithium metal batteries, and particularly discloses a lithium metal secondary battery based on a porous ceramic composite lithium metal negative electrode and a preparation method of the lithium metal secondary battery. The porous ceramic lithium metal negative electrode is composed of a porous ceramic skeleton, a conductive layer and lithium metal, and compared with a traditional lithium sheet negative electrode, the porous ceramic lithium metal negative electrode disclosed by the invention has the advantages that the porosity of theporous ceramic skeleton can provide sufficient storage space for the lithium metal; the rigidity of the porous ceramic skeleton can maintain the structural stability of the lithium metal negative electrode; the large specific surface area attribute of the porous ceramic skeleton can effectively reduce the local current density of the lithium metal negative electrode and relieve the growth problemof lithium dendrites. Based on the advantages, the porous ceramic lithium metal composite negative electrode can be used for preparing a high-specific-energy lithium metal secondary battery. Meanwhile, the preparation method is simple, and large-batch manufacturing can be realized.

The invention belongs to the field of high-specific-energy lithium metal batteries, and particularly discloses a porous ceramic composite lithium metal negative electrode and a preparation method thereof. The porous ceramic lithium metal negative electrode is composed of a porous ceramic skeleton, a conductive layer and lithium metal, and compared with a traditional lithium sheet negative electrode, the porous ceramic lithium metal negative electrode disclosed by the invention has the advantages that the porosity of the porous ceramic skeleton can provide sufficient storage space for the lithium metal; the rigidity of the porous ceramic skeleton can maintain the structural stability of the lithium metal negative electrode; the large specific surface area attribute of the porous ceramic skeleton can effectively reduce the local current density of the lithium metal negative electrode and relieve the growth problem of lithium dendrites; the composite negative electrode has the characteristics of high structural strength, high coulombic efficiency, low polarization, no lithium dendrites, good cycling stability and the like, meanwhile, the preparation method is simple, and large-batch manufacturing can be realized. The porous ceramic lithium metal composite negative electrode can be used for preparing a high-specific-energy lithium metal secondary battery, including an organic electrolyte system lithium ion battery, a lithium-air battery, an all-solid-state lithium ion battery, a lithium-air battery and the like.

The invention discloses a rare earth molten salt electrolytic cell with a novel electrode structure. The bottoms of anodes are in the shape of inverted V or single slope; a group of cathodes is correspondingly arranged below each group of anodes; the cathodes are embedded into a raised high-temperature anti-corrosion material; the tops of the cathodes are of triangular prisms, and are protruded to the outside of the high-temperature anti-corrosion material; a metal groove formed by sinking the high-temperature anti-corrosion material is arranged between every two cathodes; cathode steel rods are positioned on the bottoms of the cathodes, and are connected to the cathodes; and an unloader is arranged on the top of an electrolytic cell body. According to the rare earth molten salt electrolytic cell disclosed by the invention, the shapes of the anodes are beneficial for anode bubble discharge; the high-temperature zone of the electrolytic cell is moved upwards as a result of the designs of the cathodes and the metal grooves; the secondary reaction of rare earth metal is restrained; and the current efficiency is improved.

The invention relates to the field of lithium batteries, in particular to a negative electrode current collector complex, a preparation method thereof and a lithium metal battery. The negative electrode current collector complex comprises a negative electrode and a current collector, the negative electrode is a lithium metal layer, the current collector comprises a polymer film, copper metal areas are arranged on the two side faces of the polymer film, copper metal layers are arranged on the copper metal areas, the lithium metal layer is attached to the side, away from the polymer film, of the copper metal layer, and the area of the copper metal layer is 20-70% of the area of the polymer film; the lithium metal layer and the polymer film coincide in size. The lithium metal battery provided by the invention adopts the current collector, so that the energy density of the lithium metal battery is improved, uneven lithium deposition on the surface of a negative electrode is also inhibited in the charging process of the battery, and the cycle life of the battery is further prolonged.

The invention relates to a magnetic lithium metal battery copper magnetic composite electrode material and a preparation method and application thereof and belongs to the technical field of magnetic batteries. The preparation method comprises 1), removing oxides on the surface of a copper substrate and carrying out cleaning and drying, and 2), preparing a magnetic layer structure containing a magnetic metal on the surface of the copper substrate treated by the step 1), wherein the magnetic metal includes iron, cobalt, nickel and platinum and the magnetic layer structure includes a magnetic plating layer structure, non-magnetic micro-nano-structure doped magnetic particles, magnetic micro-nano-structure doped magnetic particles and a magnetic micro-nano-structure.

The invention discloses a preparation method of a porous graphene / silver nanoparticle composite lithium metal secondary battery negative current collector. The method includes the following steps: 1,dispersing graphene oxide in an aqueous solution to form a uniform graphene oxide solution; 2, adding silver nanoparticles into a micro / nano microsphere template solution, and fully stirring under theirradiation of ultraviolet light to uniformly load the silver nanoparticles on template microspheres; 3, mixing the solutions obtained in the steps 1 and 2, and performing ultrasonic treatment in anultrasonic cleaning machine; 4, performing vacuum filtration on the mixed solution obtained in the step 3 to obtain graphene oxide, micro / nano template microsphere and silver nanoparticle composite materials; and 5, processing the composite material obtained in the step 4, removing the micro / nano template microspheres to obtain a porous graphene oxide / silver nanoparticle material, and finally carrying out sintering to obtain the required porous graphene / silver nanoparticle composite material. The material can be directly used in a negative electrode of a lithium metal secondary battery.

The invention relates to a 3D porous current collector and a preparation method and application thereof. The preparation method herein includes: punching a copper foil to obtain a disc, washing the disc sequentially with acetone, ethanol, hydrochloric acid and deionized water, soaking the washed disc in a mixed solution of ammonium persulfate and sodium hydroxide for 15 min, taking out, washing sequentially with deionized water and ethanol, drying in air for 12 hours, heating from room temperature to 180 DEG C, holding the temperature for 4 hours, cooling with a gas to room temperature to obtain the 3D porous current collector. A layer of copper oxide nanowire array is grown on a copper foil by an in-situ process herein; the presence of the copper oxide nanowire array helps increase the specific surface area of the current collector, and reduce local current density of electrode surface; a battery with the current collector provided herein has coulombic efficiency kept to 90% and aboveafter 100 cycles under normal temperature and the current density of 0.5 to 1 mA / cm<2>.

The invention discloses a carbon material lithium metal composite negative electrode and a preparation method and application thereof, and the carbon material lithium metal composite negative electrode is formed by compounding a carbon material three-dimensional current collector which is constructed on the surface of a copper foil and is subjected to surface modification treatment with lithium metal. According to the preparation method of the carbon material lithium metal composite negative electrode, the lithium affinity of a carbon material three-dimensional current collector is improved by performing surface treatment on a carbon material, so that the cycling stability of the carbon material lithium metal composite negative electrode is improved. According to the application of the carbon material lithium metal composite negative electrode, the carbon material lithium metal composite negative electrode and a positive electrode material are assembled into a lithium metal battery; or the composite material is applied to various lithium metal battery systems such as Li-S batteries and Li-air batteries. The lithium metal composite negative electrode prepared by the method also shows excellent cycling stability in total battery circulation, is high in operability, is convenient for industrial production and popularization, and has a wide application prospect in the field of high-energy-density lithium batteries.

The invention discloses a metal lithium negative electrode for in-situ construction of a multifunctional biomimetic membrane and a preparation method of the metal lithium negative electrode. The preparation method comprises the following steps of carbonizing a biomass material to obtain biomass carbon, and then introducing an acidic active group to obtain a mixed carbon material, adding the mixedcarbon material and the resin film into a first solvent, and fully mixing to obtain a first mixed solution, adding a second solvent into the first mixed solution and uniformly mixing to obtain a second mixed solution, performing in-situ electrostatic spinning on the second mixed solution on the surface of metal lithium by adopting wet spinning to obtain a biomass biomimetic membrane with a uniformstructure, coating the surface of the biomass biomimetic membrane with a layer of pore-closing agent, and conducting curing processing. Therefore, the biomass composite membrane with controllable distribution and size can induce uniform deposition of lithium ions, reduce the surface current density and inhibit growth of lithium dendrites, so that the cycling stability of the whole electrode material is remarkably improved.

The invention relates to the field of lithium metal air batteries, in particular to a copper magnetic current collector, a preparation process thereof and a magnetic lithium air battery containing thesame. Surface modification is performed on a material with the permanent magnetic property to obtain a negative electrode material of a lithium air battery with large specific surface and high catalytic activity. According to the invention, the mass transfer process of oxygen is enhanced through the micro magnetic field, the concentration of active oxygen on the positive electrode surface is improved by the paramagnetic property of oxygen, the magnetohydrodynamics effect, the magnetization force effect and the like produce disturbance on the electrolyte, so that the reaction activity of the gas-liquid-solid three-phase interface is increased, the polarization is reduced, non-uniform deposition of the negative electrode metal lithium is improved, and the lithium dendrites are inhibited; the catalytic activity of the bifunctional catalyst is increased and the over-potential is reduced by the electric field generated by the copper layer structure; by the structure field energy, the volume change stress is released, the expansion space is provided, a uniform reaction active site and the like are provided, and the overall electrochemical performance is fully improved.

The invention belongs to the field of metal secondary batteries, and discloses a three-dimensional flexible metal negative electrode and a preparation method thereof. The method comprises the following steps: (a) preparing metal nanowire ink, selecting sponge, soaking the sponge in the metal nanowire ink until the sponge is saturated, taking out the sponge, and performing drying to obtain a three-dimensional flexible current collector; (b) selecting a metal negative electrode, taking the three-dimensional flexible current collector as a positive electrode, and assembling the button half-cell by utilizing the positive electrode and the metal negative electrode; (c) carrying out electro-deposition on the button half-cell to enable the metal negative electrode to be deposited on the three-dimensional flexible current collector, and disassembling the button half-cell to obtain the three-dimensional flexible current collector with the metal negative electrode deposited on the surface, namely the required three-dimensional flexible metal negative electrode. The invention also discloses a product prepared by the method. According to the invention, the metal nucleation overpotential is reduced, and the stress generated in the electrodeposition process is absorbed and released, so the problem of dendritic crystal growth in the metal negative electrode is solved.

The invention discloses a lithium-loaded composite framework material and a preparation method and application thereof.The lithium-loaded composite framework material is of a thin film packaging structure internally packaged with a plurality of hollow thin-wall carbon nanospheres, low-lithium-precipitation overpotential nano particles are compounded on the inner walls of the hollow thin-wall carbon nanospheres, a thin film is a high-lithium-precipitation overpotential film layer, and the hollow thin-wall carbon nanospheres are arranged on the inner walls of the hollow thin-wall carbon nanospheres. The film layer is a single layer or a plurality of layers and is selected from a carbon layer, a polymer film layer, a solid electrolyte film layer, an oxide film layer or an ion / electron mixed conductor film layer; the low lithium precipitation overpotential nanoparticles are defined as simple substances or compounds with the reaction potential with lithium being greater than 0V; the high-precipitation lithium overpotential film layer is defined as a film layer in which the electrodeposition potential of lithium on the surface thereof is less than 0V. Compared with a thin film, the inner wall of the lithium-loaded composite framework material has lower lithium precipitation potential, so that lithium ions can only penetrate through the carbon wall and are preferentially nucleated and deposited in the hollow carbon sphere, and packaging and continuous and uniform deposition / dissolution of lithium metal are realized.

The invention discloses a lithium metal-based battery taking copper selenide in-situ coated foamy copper as a lithium metal carrier and a preparation method of the lithium metal-based battery. The preparation method comprises the following specific steps: (1) dissolving selenium dioxide in an aqueous solution; (2) immersing the purified foamy copper into a solution; (3) putting the soaked modifiedfoamy copper into a vacuum drying oven for drying; (4) carrying out lithium metal loading and electrochemical performance characterization on the copper selenide in-situ coated foamy copper current collector obtained after modification. According to the invention, liquid-phase selenylation is adopted to carry out surface lithium-affinity modification on low-price foamy copper, the foamy copper iscompounded with lithium metal, and the chemical composition, multi-dimensional interpenetrating structure and good conductivity of the foamy copper and the lithium affinity of a surface layer are utilized to achieve the effects of accommodating and uniformizing lithium nucleation, inhibiting lithium dendritic crystal growth and improving the performance of the lithium ion battery. And finally, the coulombic efficiency and the cycle performance of the lithium metal negative electrode are improved. The method has the advantages of short production period, simple process, low production cost andhigh cycling stability.

The invention relates to the technical field of preparation of electrode materials, in particular to a high-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, a preparation method and application thereof. The negative electrode material comprises: an MXene film, COF nanoparticles and metal lithium; the COF nanoparticles are dispersed in the MXene film, and the metal lithium is distributed in a MXene-COF three-dimensional current collector. The MXene-COF current collector has a three-dimensional structure, and metal lithium can be wrapped in the MXene-COF current collector, so that the local current density can be reduced, the growth of lithium dendrites can be inhibited, and the volume expansion effect of a metal lithium negative electrode in deposition / stripping can be relieved.

The invention discloses a method for preparing a three-dimensional metal lithium negative electrode by using an MOFs derivative. Preparing a metal organic framework material; mixing the pretreated three-dimensional porous skeleton with a metal organic framework material, so that the metal organic framework material uniformly grows on the three-dimensional porous skeleton; transferring into a muffle furnace for carbonization; and pouring the molten liquid metal lithium into the whole framework to obtain the novel three-dimensional metal lithium negative electrode. The electrode can be applied to a liquid lithium battery and a high-energy-density lithium-oxygen and lithium-sulfur solid-state battery, the local current density is effectively reduced, the growth of lithium dendrites is inhibited, the safety of the battery is improved, and the service life of the battery is prolonged. The method can effectively cope with the volume expansion of the lithium negative electrode, improve the interface stability of the electrode / electrolyte, the electrochemical performance of the electrode and the like, can also be applied to metal batteries with higher energy density, such as three-dimensional metal sodium negative electrode, zinc negative electrode, potassium negative electrode and the like, and further promotes the research, development and practice pace of high-safety power batteries.

The invention discloses a contact system, and the system includes at least one contact pair and a flexible contact support. The contact pair includes a fixed contact piece connected to a first conductor rail and a moveable contact piece. The flexible contact support includes first and second spring limbs connected to each other via a connection. An end of the first spring limb connected to a second conductor rail and the moveable contact piece attached on the second spring limb. The opposing first and second spring limbs extending from the connection form a sharp angle V-shaped configuration.The contact support may be formed of a single piece or of a multi-piece design. The contact support may, in the connection area, be formed of two spring limbs arranged in parallel above one another and connected to each other.

The invention discloses a diaphragm functional material for improving electrochemical performance of a lithium metal battery as well as preparation and application of the diaphragm functional material. The preparation method comprises the following steps: (1) dissolving sodium tungstate, potassium sulfate and sodium citrate in an aqueous solution containing graphene oxide; (2) adjusting the pH value of the solution; (3) pouring into a reaction kettle, and carrying out hydrothermal reaction; (4) after finishing, cooling to room temperature, filtering, cleaning, and freeze-drying to obtain a tungsten oxide and graphene oxide compound precursor; (5) carrying out ammoniation treatment on the precursor in an ammonia gas atmosphere, and cooling to room temperature to obtain the tungsten nitride embedded nitrogen-doped graphene nanoflower; according to the method, a tungsten precursor is synthesized through a complex surfactant assisted hydrothermal method for the first time, then the tungsten nitride embedded nitrogen-doped graphene nano-powder body is obtained through ammoniation, raw materials are green and environmentally friendly, reaction conditions are mild, repeatability is good, large-scale production can be achieved, and the method is suitable for industrial production. And the electrochemical performance of the lithium metal battery can be obviously improved by using the composite material as a diaphragm functional layer of the lithium metal battery.

The invention relates to the technical field of electrochemistry and new energy materials, in particular to a heteroatom in-situ doped porous carbon composite lithium negative electrode and a preparation method and application thereof. The heteroatom in-situ doped porous carbon composite lithium negative electrode comprises the following raw materials: a porous carbon material and lithium, the porous carbon material comprises a carbon framework containing a pore structure, the carbon framework is uniformly doped with heteroatoms, and the heteroatoms comprise at least one of nitrogen, oxygen, phosphorus and sulfur. According to the scheme, the technical problem that the battery performance is difficult to improve due to the fact that an existing lithium negative electrode and a preparation method thereof cannot effectively improve the deposition-dissolution behavior of lithium is solved. According to the scheme, the three-dimensional porous carbon framework containing the electronegative functional group is used, the deposition-dissolution behavior of lithium is directionally regulated and controlled, and the prepared heteroatom in-situ doped porous carbon composite lithium negative electrode has a wide application prospect in the fields of liquid lithium ion batteries and solid lithium batteries.

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 belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery negative electrode current collector, a preparation method thereof and a sodium-ion battery. The sodium ion battery negative electrode current collector comprises an aluminum foil, the surface of the aluminum foil is provided with a nanosheet array, and compared with a conventional aluminum foil, the aluminum foil with the surface provided with the nanosheet array is large in specific surface area, so that the contact area between a negative electrode and electrolyte is increased, the local current density of the sodium ion battery negative electrode is reduced, and uniform distribution of sodium ion flux is promoted; the growth of sodium dendrites is inhibited, and the technical problem of low cycle efficiency of the sodium-ion battery caused by sodium dendrite growth and volume expansion in the repeated cycle process of the sodium-ion battery negative electrode in the prior art is solved.

The invention discloses a uniformly-distributed three-dimensional lithium alloy negative electrode and a preparation method thereof. The preparation method comprises the following steps: (1) smelting metal lithium and other metals at high temperature to obtain an alloy material; (2) rolling the alloy material through a roller to obtain an alloy belt, and performing roughness treatment on the alloy belt; (3) the pure lithium strip is subjected to surface roughness treatment after being subjected to surface polishing; (4) the treated alloy strip and the pure lithium strip are subjected to composite rolling, the grooves and the protrusions are embedded, and then roller rolling is carried out to obtain a composite strip; and (5) carrying out heat treatment on the rolled composite strip to obtain the uniformly distributed three-dimensional lithium alloy negative electrode material. The cycle life of the three-dimensional lithium alloy negative electrode material prepared by the method is obviously prolonged, and the lithium dendrite problem is obviously improved, so that the safety performance of the battery is greatly improved.

The invention belongs to the field of metal electrodes, and particularly relates to a preparation method and an application of a three-dimensional composite potassium metal negative electrode. The three-dimensional composite potassium metal negative electrode comprises a SnO2 / PCNF composite material and metal potassium covering the SnO2 / PCNF composite material. The composite potassium metal negative electrode is simple and convenient in preparation method, smooth in morphology and stable in structure. High-conductivity three-dimensional microporous carbon nanofibers not only can reduce the local current density and induce uniform deposition of potassium ions, but also can relieve huge volume expansion in the potassium metal deposition / separation process and are beneficial to the preparation of a potassium metal negative electrode with high cycling stability. The three-dimensional composite potassium metal negative electrode material is prepared by hot melting, and the preparation method is simple and easy to operate, low in energy consumption, low in price and capable of being applied on a large scale.

The invention belongs to the technical field of lithium metal battery materials, and particularly discloses a Cu3P@P-doped mesoporous carbon composite framework, and a preparation method and application thereof. The Cu3P@P-doped mesoporous carbon composite framework comprises thin-wall mesoporous carbon frameworks which are mutually crosslinked, cavities which are mutually communicated, Cu3P nanoparticles which are compounded on the inner sides of the cavities of the mesoporous carbon frameworks, and phosphorus-containing functional groups which are doped on the mesoporous carbon frameworks; a large number of cavities are contained in the mesoporous carbon frameworks, and the cavities are of a three-dimensional networked structure communicated through pore channels; the Cu3P nanoparticles are doped on the inner sides of the cavities of the mesoporous carbon frameworks in situ; and the phosphorus-containing functional groups are uniformly distributed on the surfaces of the mesoporous carbon frameworks. The Cu3P@P-doped mesoporous carbon composite framework material provided by the invention has a relatively large specific surface area, and can effectively reduce the local current density; due to the mutually communicated cavity structures, the transmission of lithium ions can be accelerated, and the reaction kinetics can be optimized; the Cu3P nanoparticles and the phosphorus-containing functional groups are used for inducing the deposition behavior of lithium, and selective deposition is realized; and the constructed lithium metal negative electrode has excellent electrochemical performance, and the coulombic efficiency and the cycling stability are greatly improved.

The invention discloses a three-dimensional porous substrate material for a lithium metal battery negative electrode and a preparation method and application thereof, and relates to a three-dimensional porous substrate material and a preparation method and application thereof. The invention aims to solve the problems of battery safety and instability of electric circulation caused by dendritic crystal growth of a metal lithium negative electrode in a metal lithium battery in a circulation process. The invention discloses a three-dimensional porous substrate material for a lithium metal battery negative electrode. The three-dimensional porous substrate material consists of foam metal and metal carbon / nitride. The method comprises the following steps: 1, pretreating foam metal; 2, preparing a two-dimensional MXenes nano material; and 3, preparing the three-dimensional porous substrate material. The three-dimensional porous substrate material for the negative electrode of the lithium metal battery is used as a substrate material of the negative electrode of the lithium metal battery. The three-dimensional porous substrate material for the negative electrode of the lithium metal battery has huge application potential in the lithium metal battery. The three-dimensional porous substrate material for the negative electrode of the lithium metal battery can be obtained.

The invention discloses a preparation method of a flexible self-supporting iron-doped porous carbon nanofiber lithium metal negative electrode framework material, and belongs to the field of lithium metal battery materials. The nanofiber is prepared by taking cheap ferric acetylacetonate, polyacrylonitrile and polymethyl methacrylate as raw materials through electrostatic spinning and high-temperature heat treatment. The lithium metal negative electrode framework prepared by the preparation method has a relatively large specific surface area, an electric field can be uniform, and local current density can be reduced, so uniform lithium deposition is caused, and formation of lithium dendrites is effectively avoided; the three-dimensional porous main body can provide open pores so as to adapt to volume change and lithium ion transmission; the nitrogen and oxygen doped carbon main body can strongly interact with lithium atoms, so that lithium nucleation becomes easier and more uniform; meanwhile, the material is simple in preparation method, relatively low in cost, green and efficient, can be produced on a large scale, can be used as an ideal high-performance lithium metal negative electrode framework material, and has a very good practical prospect.