74results about How to "Improve Coulombic efficiency" patented technology

This invention discloses a method for preparing and applying a current collector for a negative electrode-free sodium metal battery modified with monodisperse metal sites. The current collector substrate is placed in the reaction chamber of an atomic layer deposition (ALD) apparatus. A metal source and co-reactants are introduced through alternating feeding to generate monodisperse metal atoms, ultimately producing a negative electrode-free sodium metal current collector. By constructing uniform, high-density monodisperse metal atoms on the surface of the current collector substrate, the active sites of the metal atoms are densely and uniformly distributed. This guides sodium metal to deposit and peel off in a dense, flat layered morphology, effectively suppressing sodium dendrite formation and reducing the generation of dead sodium during cycling. This significantly improves the coulombic efficiency of the negative electrode-free sodium metal battery. When applied to a negative electrode-free sodium metal battery, the battery can achieve stable long-cycle operation in the initial state of a completely sodium-free negative electrode, effectively improving battery cycle stability and coulombic efficiency, and significantly extending battery life.

The application discloses a niobium-based compound / silicon-carbon composite material and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries.The composite material comprises a silicon-based material, a plurality of niobium-based compound particles anchored on the outer surface of the silicon-based material, and a carbon nano layer coated on the outer surfaces of the silicon-based material and the plurality of niobium-based compound particles.The composite material is realized by using a simple, convenient and industrialized production liquid phase method.The composite material obtained by the preparation method effectively alleviates the volume expansion of the silicon-based material and avoids the problem of niobium-based compound falling off, and when the composite material is applied to a lithium ion battery as a negative electrode material, excellent rate performance and cycle stability are exhibited.

This invention provides a method for screening the stability of biomass shell-derived hard carbon raw materials. The method investigates the optimal ratio and relationship between the lignin content and sugar content measured after alkali treatment in biomass shell materials, thereby screening the stability of biomass shell materials from different sources and batches. When the lignin content of the biomass shell material itself and the sugar content measured after alkali treatment satisfy the relationship 15≤β×L≤60, an effective balance between the lignin and sugar content in the biomass shell material can be achieved, resulting in a good porous structure. This method provides a simple and rapid screening process to obtain biomass shell materials with better stability. When biomass shell materials with better stability are subsequently used to prepare hard carbon battery materials, the resulting hard carbon battery materials exhibit good overall performance in terms of cycle life, capacity, and coulombic efficiency.

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 an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.

This invention discloses a zinc thiocate modified copper current collector for electrodeless lithium metal batteries and its preparation method. Thioctic acid and zinc acetate are dissolved in solvents, and a composite solution is prepared by the coordination interaction between zinc ions and the carboxyl groups of thiocate. This composite solution is then spin-coated onto the surface of the copper current collector to form an ordered protective coating. This invention synergistically regulates the interface through the dual functions of zinc ions: firstly, zinc ions act as divalent coordination centers, cross-linking with thiocate molecules to construct a stable and regularly arranged protective coating; secondly, zinc ions act as lithiophilic nucleation sites, reducing the lithium nucleation overpotential, inducing uniform lithium ion deposition, and significantly inhibiting lithium dendrite growth. The modified current collector of this invention achieves a synergistic improvement in interface stability and electrochemical activity, enabling the battery to possess excellent cycle life and high safety, providing a novel interface design strategy for high-performance electrodeless lithium metal batteries.

This invention relates to a shear-thickening electrolyte and its preparation method. The shear-thickening electrolyte exhibits impact-hardening properties under high excitation and flame-retardant properties under low excitation. The shear-thickening electrolyte comprises lithium salt, organic solvent, and mesoporous particulate filler for adsorbing flame retardants. The preparation method includes the following steps: a. synthesis of mesoporous silica; b. dispersion of the product obtained in step a in a triphenyl phosphate ethanol solution, followed by stirring and ultrasonic adsorption; c. uniform dispersion of the product obtained in step b in a conventional electrolyte. The shear-thickening electrolyte possesses the functions of rapid hardening under high impact rates to resist external impacts and flame retardancy under low excitation rates, protecting users from impact and high-temperature damage.

The application relates to the technical field of battery materials, and discloses a sodium-philic carbon-based material, a negative-electrode-free current collector, a preparation method of the sodium-philic carbon-based material and a sodium metal battery. The preparation method of the sodium-philic carbon-based material comprises the following steps: providing a mixed solution, wherein the mixed solution comprises carbon source powder, an iron source and a solvent; fully reacting the mixed solution in a protective atmosphere at 160-240 DEG C; obtaining a carbon-loaded sodium-philic material after solid-liquid separation; fully calcining the carbon-loaded sodium-philic material in an inert atmosphere at 700-900 DEG C to obtain a porous sodium-philic precursor; and treating the porous sodium-philic precursor in a reaction gas atmosphere at 400-700 DEG C for 1-3 hours to obtain the sodium-philic carbon-based material. The reaction gas atmosphere is an ammonia gas and inert gas mixed atmosphere or an ammonia gas atmosphere. The material is coated on the surface of the negative-electrode-free sodium metal battery current collector, and can enhance the electrochemical performance of the battery.

The invention provides a preparation method of a metal lithium powder composite electrode containing a BIMSM binder, and the method comprises the following steps: S1, dissolving a brominated isobutylene-p-methylstyrene copolymer in a first organic solvent to obtain a pre-coating solution; s2, in an inert atmosphere, adding metal lithium powder into the pre-coating solution for dispersing and mixing, and then removing the solvent and drying to obtain modified metal lithium powder coated with a BIMSM layer on the surface; s3, dispersing the modified metal lithium powder, butadiene styrene rubber, a conductive agent and a cross-linking agent in a second organic solvent, and uniformly mixing to obtain electrode slurry; and S4, coating the surface of a current collector with the electrode slurry, heating, drying and rolling to obtain the metal lithium powder composite electrode. The metal lithium powder composite electrode prepared by the invention effectively inhibits volume expansion and dendritic crystal growth of metal lithium, and the cycle life and coulombic efficiency of the battery are remarkably improved.

This application relates to the technical field of lithium-ion battery materials, specifically disclosing a high-efficiency silicon-oxygen composite anode material, its preparation method, and its application. The preparation method of this anode material includes the following steps: mixing a siloxane with a fatty acid at a mass ratio of 1:(5~35), and ball milling under inert gas protection to obtain a pre-coated mixture; heating the pre-coated mixture to 50~1500℃ under an inert atmosphere and holding for 1~20h to obtain a carbon-coated silicon-oxygen material; immersing the carbon-coated silicon-oxygen material in a lithium-rich organic composite solution, holding at -5~25℃ under inert gas protection for 5~180 minutes, and drying to obtain a pre-lithiation product; mixing the pre-lithiation product with a nitride at a mass ratio of 1:(0.1~5), and ball milling under inert gas protection to obtain the high-efficiency silicon-oxygen composite anode material. This application can synergistically improve the stability and initial efficiency of the silicon-oxygen composite anode material.

The invention discloses a method for preparing a stable metal zinc negative electrode surface of a beta-cyclodextrin modified polyion elastomer copolymer electrolyte membrane, which comprises the following steps of: preparing mixed slurry of a polyion elastomer and beta-cyclodextrin by taking metal zinc as a substrate through chemical polymerization and microphase separation strategies; a metal zinc substrate is uniformly coated with the obtained slurry, a copolymer electrolyte membrane is constructed on the surface of metal zinc, the obtained copolymer electrolyte membrane has the functions of corrosion protection, regulation and control of zinc ion transportation and inhibition of hydrogen evolution reaction, beta-cyclodextrin in the copolymer electrolyte membrane can provide an ion channel for zinc ions, a diffusion path can be standardized, and the service life of the electrolyte membrane is prolonged. And the mass transfer process is accelerated, and zinc ions are induced to horizontally deposit along the (002) crystal face. The beta-cyclodextrin modified polyion elastomer stabilized metal zinc negative electrode surface multifunctional copolymer electrolyte membrane disclosed by the invention has the physical properties of high breaking strength, high flexibility and good conductivity, and has a self-repairing function; and the internal ion grid structure can obviously prolong the cycle life of the zinc metal battery in an aqueous electrolyte.

This invention discloses a cobalt-free lithium-rich manganese-based cathode material, its preparation method, and its application. The cobalt-free lithium-rich manganese-based cathode material is doped with rare earth elements, and the ratio of the amount of rare earth elements to the total amount of nickel, manganese, and rare earth elements is 0.1-5%. By introducing rare earth elements, the cobalt-free lithium-rich manganese-based cathode material significantly improves its structure and electrochemical stability. Specifically, rare earth ions have large radii and high charges, preferentially entering the lithium layer to form a "pinning effect," effectively suppressing transition metal migration and the layered-to-spinel phase transition during cycling, thereby alleviating voltage decay. Their strong M–O bonding ability enhances lattice oxygen stability, reduces O2 release under high voltage, and improves the first-cycle coulombic efficiency.

The application discloses a method for modifying graphite felt electrodes with manganese dioxide nanoparticles and application. The method comprises the following steps: using an electrochemical method and selecting an ammonium sulfate electrolyte to pretreat graphite felt to improve the surface wettability; continuing to use the electrochemical method and selecting a DMF dispersion solution of graphene to etch the pretreated graphite felt to obtain a three-dimensional porous graphite felt; finally, using a hydrothermal reaction to make manganese dioxide nanoparticles directly generate on the surface and inside of the three-dimensional porous graphite felt to obtain a porous carbon fiber confined manganese dioxide nanoparticle modified graphite felt electrode. The method confines manganese dioxide nanoparticles with high catalytic activity in the porous carbon fibers of the graphite felt electrode material, the heterostructure has rich hierarchical pores and high specific surface area, the number of active sites on the surface of the graphite felt electrode material is increased, the electrochemical activity of the graphite felt electrode is significantly improved, and an organic aqueous solution flow battery assembled therefrom has good electrochemical performance.

The invention discloses a multi-atom doped porous carbon material and a preparation method and application thereof.The porous carbon material is sodium lignin sulfonate carbon doped with phosphorus, boron, nitrogen and selenium, and the preparation method comprises the steps that the carbon material is activated and doped through solvothermal reaction to obtain a precursor, and then the precursor is subjected to high-temperature carbonization, potassium hydroxide activation and acid pickling to obtain the multi-atom doped porous carbon material. The polyatom-doped sodium lignin sulfonate porous carbon is obtained. The polyatom-doped sodium lignin sulfonate porous carbon prepared by the method provided by the invention has the advantages of ordered microstructure, hierarchical pore structure and high specific surface area, the specific surface area is greater than 2000m < 2 > / g, and the polyatom-doped sodium lignin sulfonate porous carbon can be applied to a supercapacitor electrode material, can provide a good channel for rapid diffusion and transmission of electrolyte ions in an electrochemical process, and can be used for preparing a supercapacitor electrode material. The utilization rate of active sites is increased, higher specific capacitance and excellent rate capability (the specific capacitance retention rate is greater than 60%) are shown, and the application value is good.

The application relates to a battery and an electronic device, the battery comprising a positive electrode sheet, a negative electrode sheet and an electrolyte; the positive electrode sheet comprising a positive electrode current collector and a positive electrode coating arranged on at least one side surface of the positive electrode current collector; the positive electrode coating comprising a positive electrode active material; the positive electrode active material comprising a layered oxide material and a lithium-rich compound; the negative electrode sheet comprising a negative electrode current collector and a negative electrode coating arranged on at least one side surface of the negative electrode current collector; the negative electrode coating comprising a negative electrode active material, and the negative electrode active material comprising a silicon-carbon material; the battery satisfying the following relationship: a / b >= 1.5; 3 <= c / d <= 8. The scheme provided in the application can make the battery have excellent energy density, cycle performance and storage performance.

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.

The invention relates to the technical field of electrochemical energy storage materials and preparation, and discloses a forestry and agricultural residue-based carbon material and application thereof in a zinc ion battery, the forestry and agricultural residue-based carbon material is prepared by taking forestry and agricultural residues as raw materials through cellulose extraction, three-dimensional skeleton construction through aerogel, high-temperature carbonization, potassium hydroxide activation pore-forming and electrochemical surface modification. The obtained carbon material has a three-dimensional hierarchical connected network structure composed of micropores, mesopores and macropores, and the surface of the carbon material is rich in oxygen-containing zinc-loving sites for inducing uniform deposition of zinc. When being used as a zinc-free negative electrode carrier of a zinc ion battery, the hierarchical pore structure effectively reduces local current density and buffers deposition volume expansion, and surface zinc-loving sites obviously reduce nucleation overpotential. Through cooperative regulation and control of a physical structure and surface chemistry, zinc dendrite growth and hydrogen evolution side reaction are effectively inhibited, coulombic efficiency, long cycle stability and rate capability of the battery are greatly improved, the process is controllable, and the cost is low.

This invention discloses a method for preparing hard carbon materials for high-rate cycling sodium-ion battery anodes and their applications, relating to the field of energy storage materials technology. The invention uses phenolic resin prepolymer and melamine-formaldehyde prepolymer with a specific degree of polymerization as precursors, constructs a three-dimensional cross-linked network via a solvothermal method, and employs a stepped variable-temperature carbonization process including low-temperature polycondensation, medium-temperature pore-forming, and high-temperature reforming stages. This method utilizes a structure-directing agent to form a closed-pore structure through in-situ decomposition and precisely controls the carbon interlayer spacing. The prepared hard carbon material possesses short-range ordered pseudo-graphite microcrystals and a suitable interlayer spacing (0.38nm-0.42nm). When used as a sodium-ion battery anode, it exhibits a reversible specific capacity higher than 400mAh / g, an initial coulombic efficiency exceeding 92%, and a capacity retention rate greater than 90% after 1000 cycles at 5C high rate. This invention solves the problems of poor rate performance and low initial efficiency of existing hard carbon materials, making it suitable for high-power energy storage devices.

This invention discloses a method for restoring the electrolyte in a zinc-bromine flow battery, belonging to the field of flow batteries. After debromination of the zinc-bromine flow battery electrolyte, a carbonate additive is added. This additive is stable in the zinc-bromine battery electrolyte, does not participate in the charge / discharge reaction during battery charging and discharging, regulates the electrolyte pH, and does not introduce new impurities into the electrolyte. After long-term battery operation, to ensure stable battery operation, the electrolyte needs to be debrominated periodically. When the battery is in standby mode, the large amount of elemental zinc deposited at the negative electrode reacts with hydrogen ions in the electrolyte, thereby reducing capacity and affecting the battery's coulombic efficiency. When the electrolyte pH drops significantly, a small amount of additive is added to the solution. The carbonate hydrolysis consumes the hydrogen ions in the electrolyte, thereby increasing the electrolyte pH value, reducing the consumption of elemental zinc at the negative electrode during standby, and improving the battery's standby performance.

The invention discloses a porous composite membrane as well as a preparation method and application thereof. The porous composite membrane comprises an ion conduction layer and a high-strength layer; the thickness of the ion conduction layer is 30-70 [mu] m; the thickness of the high-strength layer is 4-15 microns; and the thickness of the porous composite membrane is 34-85 [mu] m. And the high-strength layer can further screen protons and metal ions, so that the coulombic efficiency of the battery is further improved. The membrane has excellent chemical stability, and provides a new direction for the design of a high-performance membrane of a flow battery. The preparation method is simple and easy to implement, and mass production is easy to realize. And the high-strength layer is not easy to fall off and has excellent mechanical properties.

This application discloses a solid electrolyte precursor, a solid electrolyte, and a solid lithium battery, relating to the technical field of solid electrolytes; the solid electrolyte precursor is processed to form a solid electrolyte containing thiourea structural units, the thiourea structural units containing N-H groups capable of participating in hydrogen bonding; the solid electrolyte exhibits an ionic conductivity of not less than 1.6 × 10⁻⁶ at 25°C. ‑4 S·cm ‑1 This application describes a solid electrolyte formed from a solid electrolyte precursor. The solid electrolyte contains thiourea structural units and forms a polymer network structure with modified inorganic fillers as connecting points. This improves the interfacial compatibility between inorganic and organic materials in the solid electrolyte and forms a continuous conductive path in the solid electrolyte, thereby increasing the ionic conductivity of the solid electrolyte.

The application relates to a preparation method of a suspension electrolyte and application thereof, and aims to solve the problems of high impedance, high viscosity and high cost of the existing high-concentration electrolyte. The preparation method of the suspension electrolyte is as follows: main salt powder is added into a solvent, magnetic stirring is carried out until the main salt particles are fully dispersed, trace water is added according to the molar ratio of water to metal ions in the main salt powder, the magnetic stirring is continuously carried out, a suspension electrolyte in which the main salt is not fully dissolved is obtained, and the concentration of the main salt in the system is controlled to be 1-5 mol / L. The double-ion battery using the suspension electrolyte of the application reduces the high-concentration electrolyte impedance, maintains good fluidity, and can realize the effect of the high-concentration electrolyte by using a small amount of main salt; when the double-ion battery using the suspension electrolyte of the application uses graphite for the positive and negative electrodes, the effective cycle number can reach 1200 times, and the coulomb efficiency can be above 90%.

This invention discloses a surface-modified current collector, an all-solid-state battery, its preparation method, and an electrical device. The surface-modified current collector includes a negative electrode current collector substrate, a lithium storage layer, and a lithiophilic layer arranged sequentially along the thickness direction. The lithium storage layer has a plurality of micropores oriented perpendicularly to and / or inclined to the surface of the negative electrode current collector substrate. The lithium storage layer includes a conductive micropore template with a micropore structure having a plurality of micropores with the same orientation as the micropores and a vanadium nitride layer disposed on the surface of the conductive micropore template and the inner wall of its micropore structure. This lithium storage layer constitutes a three-dimensional conductive framework, which can guide lithium ions to transport longitudinally or tend to transport longitudinally and deposit uniformly, suppress lithium dendrite growth, and alleviate volume expansion stress during cycling. The lithiophilic layer provides low nucleation overpotential sites, further promoting uniform lithium deposition. Through the synergy of the above layers, uniform lithium deposition can be effectively achieved, and volume expansion stress during cycling can be dispersed and absorbed, significantly improving the cycle performance and safety of the battery.

The application discloses a covalent organic framework containing anthraquinone structure and application of the covalent organic framework in a water-based zinc ion battery. A covalent organic framework material (TfDa-COF) containing a large number of active sites (C=O) and connected by beta-ketoenamine bonds is synthesized by taking 2,4,6-trihydroxy-1,3,5-benzene tricarboxaldehyde as a node and 2,6-diaminoanthraquinone as an active monomer. The stable covalent bond connection of the TfDa-COF makes the TfDa-COF have excellent dissolution resistance, effectively improves the cycle stability of the battery, the ordered channel and the pi-conjugated structure enhance the Zn 2+ and electron transmission capacity, and the charge-discharge efficiency of the battery is optimized; the redox building block can be reasonably assembled to the COF at the molecular level, and the anthraquinone carbonyl introduced promotes the optimal adjustment of the activity of the material. When the TfDa-COF is used as a positive electrode material of a zinc ion battery, the TfDa-COF exhibits a high reversible cycle capacity, and exhibits super-long cycle stability and excellent coulombic efficiency.

The application discloses a preparation method of a lithium ion battery negative electrode material of g-C3N4 doped with CuO with a sandwich-shaped morphology. Firstly, g-C3N4 is prepared by using a thermal polymerization method and calcining melamine as raw material; then, a CuO / C3N4 composite material is obtained by adding g-C3N4 in the process of preparing CuO by using a precipitation method. The preparation process is simple and convenient, and the cost is low. The negative electrode material prepared by the method has a high specific surface area, which is helpful to improve the specific capacity of the material. The g-C3N4 is inserted into the middle of CuO layers, which relieves the volume expansion of CuO during large-current charging and discharging. The CuO / C3N4 composite material has excellent rate performance and charging and discharging cycle stability as a lithium battery negative electrode material.

This disclosure relates to electrode active materials and batteries. It discloses an electrode active material with an O3-type structure exhibiting high capacity and high coulombic efficiency. The electrode active material of this disclosure comprises a Na-containing transition metal oxide. The Na-containing transition metal oxide has an O3-type structure. The Na-containing transition metal oxide contains Na, Ni, Mn, and O as constituent elements. The X-ray diffraction pattern of the Na-containing transition metal oxide satisfies 0.476. 003 / I 104 <0.554 (where I 003 I is the intensity of the diffraction peak on the (003) plane in the X-ray diffraction pattern. 104 The intensity of the diffraction peak on plane (104) in the X-ray diffraction pattern is given.​

The scheme discloses the technical field of lithium ion capacitor preparation, and relates to a lithium ion capacitor high-temperature pressure formation process, which comprises the following steps: (1) performing first charging on the battery after liquid injection and standing, charging the electric core to 40% SOC for the first time, the pressure of the first charging is 3000-4000N, the current is 0.02C-0.1C, and the temperature is 30-40 DEG C; (2) performing second charging on the electric core after the first charging and charging to 60% SOC, the pressure of the second charging is 1500-2500N, the current is 0.1C-0.2C, and the temperature is 30-40 DEG C; (3) performing third charging on the electric core after the second charging and charging to 80% SOC, the pressure of the third charging is 500-1000N, the current is 0.2C-0.4C, and the temperature is 40-50 DEG C. The process can significantly improve the cycle life and rate performance of the lithium ion capacitor.

The application discloses a modified diaphragm for lithium-sulfur batteries and a preparation process thereof. The modified diaphragm comprises a base diaphragm and a composite layer arranged on the surface of the base diaphragm. The composite layer is doped with nano metal oxide and cobalt nonasulfide. The application sets the composite layer on the base diaphragm. The composite layer is made of metal sulfide and metal oxide. The metal sulfide cobalt nonasulfide is arranged in an array on the surface of the base diaphragm. Since the metal sulfide has porosity and polarity, and the metal oxide has adsorption and catalytic properties, the two are combined. The physical barrier and chemical adsorption of the metal sulfide are utilized, the catalytic effect of the metal oxide is fully exerted, the mechanical stability is improved, the shuttle effect of polysulfide is effectively prevented, the prepared composite layer inhibits the shuttle effect, and the Coulomb efficiency and cycle life of the lithium-sulfur battery are improved.

The invention provides a negative current collector and a preparation method thereof, a negative pole piece and a battery, the negative current collector comprises a current collector substrate, a lithium-loving metal layer and a polymer layer, the lithium-loving metal layer is arranged on at least one side of the current collector substrate, and the polymer layer is arranged on one side, deviating from the current collector substrate, of the lithium-loving metal layer; the polymer layer has a porous structure, and the polymer layer contains conjugated carbonyl. The polymer layer with the porous structure is arranged on the lithium-loving metal layer, so that uniform deposition of lithium is realized. The porous structure of the polymer layer provides a rapid migration channel for lithium ions, provides a lithium deposition space, relieves the volume expansion of the negative electrode, and inhibits the generation of lithium dendrites. The lithium-loving metal layer and the polymer layer have lithium-loving difference, lithium is induced to preferentially deposit from bottom to top through the porous structure, lithium dendrite growth is inhibited, and the coulombic efficiency in the cycle process is improved. In addition, by arranging the polymer layer, the negative electrode current collector has relatively high mechanical strength and flexibility.

The application discloses an electrolyte for a lithium metal battery and a lithium metal battery comprising the same. In the application, strontium aluminate is used as an electrolyte additive for a lithium metal battery. In the electrolyte, a small amount of strontium aluminate is added, and the strontium aluminate can be oxidized at a low voltage. Through a simple pre-circulation process, the strontium aluminate participates in the formation of an SEI film. The introduction of a small amount of strontium aluminate does not affect the normal charging and discharging of the battery. Through a simple pre-circulation, the composition of the SEI film can be improved in situ, the formation of a stable lithium metal and electrolyte interface is realized, and the energy utilization rate and cycle life of the battery are improved. This can not only inhibit the growth of lithium dendrites, but also reduce the occurrence of side reactions, improve the coulombic efficiency of the battery to 99%, prolong the cycle life, and after 300 cycles, the discharge capacity is only 93.5% of the initial capacity.