985 results about "Lithium–sulfur battery" patented technology

The invention relates to the technical field of lithium-sulfur batteries, and discloses a sulfonyl ZIF-8 metal organic framework material, a lithium-sulfur battery diaphragm and a preparation method of the lithium-sulfur battery diaphragm. The preparation method of the sulfonyl ZIF-8 metal organic framework material comprises the following steps: dissolving a metal precursor and a mixed ligand in an organic solvent, and carrying out a coordination reaction under the action of organic alkali; solid is collected, washed and dried, and the sulfonic group ZIF-8 metal organic framework material is obtained. The metal precursor is soluble zinc salt; the mixed ligand comprises 2-methylimidazole and an imidazole derivative containing a sulfonic acid group. The sulfo group ZIF-8 metal organic framework material is prepared through a ligand doping strategy and is used for functional modification of the lithium-sulfur battery diaphragm; the shuttle behavior of lithium polysulfide (LiPS) can be effectively inhibited through the electrostatic repulsion effect of sulfonic acid groups and the synergistic effect of high-polarity adsorption sites; and the migration of Li < + > and the conversion efficiency of LiPS are remarkably promoted by an efficient ion transmission network, so that the cycle performance of the lithium-sulfur battery is improved.

The invention discloses a preparation method and application of a composite sulfur positive electrode packaged by a sulfide-halide composite electrolyte spherical shell. The composite sulfur positive electrode packaged by the sulfide-halide composite electrolyte spherical shell provided by the invention has a core-shell structure, the inner core is a sulfur-carbon composite material, and the outer layer is a sulfide-halide composite electrolyte shell; the sulfur volume change effect in the charging and discharging process can be effectively relieved, uniform stress distribution and effective contact in the composite positive electrode are ensured, and the utilization rate of positive electrode active substances and the overall energy density of the battery are improved. Meanwhile, the composite sulfur positive electrode provided by the invention has high ionic conductivity at room temperature, can significantly improve the reaction kinetics of the positive electrode and improve the capacity and rate capability of the battery, can be used for assembling and preparing a solid-state lithium-sulfur battery, has good safety performance and high energy density, and has a wide application prospect.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention provides a lithium-sulfur battery abnormal heating diagnosis method and system based on deep learning, and belongs to the technical field of lithium-sulfur battery safety monitoring. According to the method, an enhanced temperature difference sequence is constructed based on temperature and voltage detection data, a temperature state sequence is modeled, and continuous dynamic representation of thermal behaviors is realized; a double-path gating mechanism is designed, a global temperature rise suppression gate is utilized to capture the overall temperature rise trend, and an abnormal temperature rise sensitive gate is combined to focus local violent fluctuation, so that normal charging and discharging temperature rise interference is effectively suppressed, and temperature abnormal probability distribution is output; meanwhile, according to the interval where the current SOC is located, a corresponding voltage compensation function is selected, original voltage data are corrected point by point, a double-group long and short time memory network is designed to extract voltage platform drift characteristics, the perception capability of abnormal drift caused by the polysulfide effect is enhanced, and finally a comprehensive risk index is generated. And when the lithium-sulfur battery is under the polysulfide shuttle effect, the battery heating abnormity identification accuracy and robustness are obviously improved.

The invention provides a lithium-sulfur battery thermal runaway monitoring method and system based on a neural network. The lithium-sulfur battery thermal runaway monitoring method comprises the steps that S1, single battery state data, group-level heat dissipation data and temperature data in a battery cabin are collected and preprocessed; s2, respectively constructing a double-branch gating network, a multi-head attention enhancement mechanism and a multi-scale residual error enhancement network, and sequentially extracting a bimodal battery characteristic, a battery heterogeneity characteristic and a deep heterogeneity characteristic; s3, extracting temperature field correlation characteristics through a temperature field correlation gating fusion mechanism; extracting monomer-overall temperature field conjugate characteristics; s4, cross-dimension fusion features are extracted through a double-feature inherent association dynamic weighting mechanism; calculating an abnormal heat value and an overall thermal runaway risk level of each single battery; and S5, performing visual display at the monitoring terminal, and triggering an early warning signal. The method can solve the problem that a traditional method cannot fuse monomer heterogeneity and overall temperature field correlation, so that local overheating is caused, and missed judgment is easily caused.

A method for synergistically preparing lithium sulfide by vacuum molten salt based on hydrogen sulfide-lithium salt reaction belongs to the technical field of battery materials, and comprises the following steps: placing a lithium salt solid in a reactor, introducing a molten salt medium on the surface of the lithium salt or in a reaction system, introducing purified hydrogen sulfide gas under a vacuum auxiliary condition, controlling the reaction temperature to be 200-500 DEG C, and reacting for 1-2 hours; and adjusting the flow rate of hydrogen sulfide to be 50-1000mL / min and the retention time to be 5-180min, continuously exhausting gas to discharge water vapor in the reaction process, stopping introducing hydrogen sulfide gas after the reaction is finished, cooling the system to room temperature under the protection of inert gas, taking out the product, washing to remove residual fused salt, and carrying out vacuum drying to obtain the high-purity lithium sulfide. The prepared lithium sulfide has high purity (greater than or equal to 99.90%), low defect density and an excellent crystal structure, and can be widely applied to lithium-sulfur batteries, all-solid-state batteries and novel energy storage technologies, so that the energy density is improved, the cycle life is prolonged, and the energy consumption is reduced.

Disclosed is an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same, more specifically an electrolyte for a lithium-sulfur battery including a lithium salt, a non-aqueous organic solvent, and an additive, wherein the additive includes a sulfide compound. The electrolyte for the lithium-sulfur battery improves the efficiency and stability of the negative electrode, thereby improving the capacity and lifetime characteristics of the lithium-sulfur battery.

The invention discloses a three-dimensional multi-interface heterostructure lithium-sulfur battery interlayer, a preparation method thereof and a lithium-sulfur battery, and the preparation method comprises the following steps: placing acidified carbon cloth in a mixed solution of cobalt nitrate, nickel nitrate and hexamethylenetetramine for primary hydrothermal reaction to prepare NiCo2O4 (at) CC; the NiCo2O4 (at) CC is placed in a mixed solution of nickel chloride and sodium molybdate, a secondary hydrothermal reaction is carried out, and NiMoO4 (at) NiCo2O4 (at) CC is obtained; according to the preparation method, NiMoO4-coated NiCo2O4-coated CC is subjected to thermal reduction annealing in a mixed atmosphere of hydrogen and argon, the three-dimensional multi-interface heterostructure lithium-sulfur battery interlayer is prepared, active sites of the three-dimensional heterostructure are increased, the oxidation-reduction reaction efficiency under high sulfur loading capacity is improved, the nano-particle anchored amorphous nanosheets form the multi-interface heterostructure, and the performance of the lithium-sulfur battery is improved. Good chemical adsorptivity and catalytic conversion on polysulfide in the battery are realized, and the cycle life of the battery is prolonged.

The invention relates to a dual-rare earth metal catalytic nano material, a diaphragm and a preparation method and application thereof. The preparation method comprises the following steps: carrying out hydrothermal reaction on an aqueous solution containing a carbon source, a hard template, a graphene oxide dispersion liquid, a nitrogen source, a phosphorus source, cerium salt and neodymium salt; then carrying out centrifugal separation to obtain a precipitate, and generating a precursor containing Ce and Nd rare earth bimetallic modified nitrogen and phosphorus doped graphene coated microspheres; and carrying out chemical etching on the precipitate after heat treatment to obtain the dual-rare earth metal catalytic nano material (HCS-coated NPrGO / CeNd). The HCS-coated NPrGO / CeNd can be used as a modification material of a lithium-sulfur battery diaphragm, not only can catalyze the conversion of polysulfide, but also can inhibit the shuttle effect of the polysulfide, so that the lithium-sulfur battery has relatively high capacity under high-rate charge and discharge, and has relatively low capacity fading rate in a high-rate long-cycle test.

Discussed is an electrolyte solution for a lithium-sulfur battery including a lithium salt, an organic solvent and an additive, and a lithium-sulfur battery including the same, wherein the additive includes a heterocyclic compound containing at least one double bond, and a heterocycle of the heterocyclic compound comprises an oxygen atom or a sulfur atom.

The present disclosure relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery comprising the same, and the electrolyte for the lithium-sulfur battery comprises a lithium salt and a nonaqueous solvent, wherein the nonaqueous solvent comprises glycol ether, cyclic ether and acyclic ether represented by the following chemical formula 1, the acyclic ether is included in an amount of 15 vol % or less based on the total volume of the nonaqueous solvent, and a ratio of a total volume of the glycol ether to a total volume of the acyclic ether is 5 or more:R1—O—R2  [Chemical formula 1]where R1 is an unsubstituted or substituted C1 to C3 alkyl group, and R2 is an unsubstituted or substituted C3 to C20 alkyl group.

According to the cobalt-doped molybdenum disulfide lithium-sulfur battery composite positive electrode material, the preparation method and the application, a cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene material is prepared by combining a solvothermal method and an annealing technology, and the process is mature; the method is simple, and the composite positive electrode material with high sulfur content is easy to obtain. According to the lithium-sulfur battery composite sulfur positive electrode material disclosed by the invention, the strong chemical adsorption effect and catalytic conversion effect of the cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene carrier on polar lithium polysulfide are utilized, so that the diffusion of the lithium polysulfide in an ether electrolyte is inhibited, and the electrochemical reaction kinetics is improved; therefore, the shuttling effect is slowed down, and the lithium-sulfur battery has the characteristics of high capacity and long service life.

The invention relates to a method for preparing lithium sulfide at low temperature by microwave molten salt assisted carbon disulfide-lithium salt reaction, and belongs to the technical field of key materials of lithium-sulfur batteries and solid-state batteries. The technical problems of high energy consumption, difficulty in inhibiting by-products, insufficient purity and crystal phase stability, difficulty in continuous amplification and the like in the existing lithium sulfide preparation process are solved. Comprising the following steps: step 1, performing crushing, screening and grading treatment on lithium source powder; step 2, placing the treated lithium source powder and molten salt in a closed reactor, and introducing CS2 in a gas or liquid form; 3, applying microwave radiation, and reacting at a gas-solid-liquid multiphase interface to generate lithium sulfide; and 4, cooling the material after the reaction to room temperature, separating and recovering the fused salt to obtain the lithium sulfide powder. The method is low in reaction temperature, low in energy consumption, high in reaction rate, high in product purity and suitable for continuous and industrial production.

The invention discloses a sulfur positive electrode material based on an amorphous crystalline cobalt phosphide / porous carbon composite carrier and a preparation method and application of the sulfur positive electrode material, the amorphous crystalline cobalt phosphide / porous carbon composite carrier is used as a conductive carrier, and the amorphous crystalline cobalt phosphide / porous carbon composite carrier is fused and compounded with active sulfur to obtain the composite sulfur positive electrode material for a lithium-sulfur battery. According to the present invention, the hierarchical porous structure is provided, the high specific surface and the high pore volume provide the sufficient sulfur loading space, the three-dimensional carbon network structure provides the excellent electron conduction and ion diffusion ability, the chemical adsorption can be well achieved, the reversible conversion of the polysulfide can be efficiently catalyzed, and the utilization rate of the active substance can be improved; the catalytic activity can be optimized, the electro-catalytic performance of the catalyst can be improved, dissolution and diffusion of polysulfide can be physically limited, and meanwhile electrode volume expansion in the charging and discharging process is relieved; the sulfur positive electrode material is applied to a lithium-sulfur battery, can effectively inhibit dissolution and shuttling of polysulfide, and shows excellent electrochemical performance.

The invention provides a layered porous WB (at) WO3 heterojunction nanosheet, a preparation method thereof and application of the nanosheet in a lithium-sulfur battery diaphragm, tungsten boron aluminide is etched by using alkali liquor to remove an Al layer in a phase to obtain a two-dimensional layered tungsten boride precursor, and then an in-situ oxidation reaction is performed to generate a WB (at) WO3 heterojunction material. Compared with the prior art, the preparation method disclosed by the invention is simple to operate, green and pollution-free to the environment, good in repeatability and easy to popularize, and the obtained porous layered structure is obtained. The precursor can be directly prepared by stirring, and the WB-coated WO3 heterojunction porous nanosheet is prepared simply and quickly by regulating and controlling the temperature. The method is used for constructing a functional modification layer on the surface of the diaphragm, so that the initial capacity of the lithium-sulfur battery is remarkably improved, the key problem of polysulfide shuttling is effectively solved, and the cycle life of the battery is comprehensively prolonged.

The utility model provides a device suitable for preparing lithium sulfide by a continuous double decomposition method. The device mainly comprises a material stirring reaction kettle, a solvent storage tank, continuous solid-liquid separation equipment, continuous solvent evaporation equipment, a first condensing tower and continuous dynamic vacuum calcination equipment, the device disclosed by the utility model can smoothly realize continuous production and preparation of lithium sulfide, and is simple in operation process and free from harmful gas pollution; in the preparation process, a single solvent is used and the solvent is recycled, so that the preparation method has the advantages of energy conservation and low cost, and cross contamination of multiple solvents is avoided; in addition, during continuous production of lithium sulfide, only one-time high-temperature calcination operation is carried out, and a lithium sulfide product with high purity and small particle size is successfully prepared; the composite cathode material can be directly used for preparing a sulfide solid electrolyte and a lithium-sulfur battery. The method has high industrial application value.

The present invention discloses a highly active cathode material catalyst for lithium-sulfur batteries and a preparation method thereof. The catalyst comprises a flaky nitrogen-doped carbon-based support and platinum metal nanoclusters uniformly embedded on the support surface. The platinum metal nanoclusters are 1-10 nm in size and have a mass ratio of 10-20% on the support. The catalyst is then processed through molten sulfur to serve as the cathode material for lithium-sulfur batteries. The catalyst is prepared by physical mixing a cyanamide compound and an organometallic molybdenum salt, or by adding a defective carbon material, and then directly carbonizing the material in an inert atmosphere in a tube furnace. The high-surface-weight-weight-weight-weight-weight-weight-sheet flaky nitrogen-doped carbon conductive material, with uniform distribution of platinum metal nanoclusters, physically adsorbs and chemically catalyzes polysulfides formed during the charge and discharge process on the positive electrode side of the lithium-sulfur battery, capturing the polysulfides and eliminating the "shuttle effect" during charge and discharge, ultimately improving the electrochemical performance of the electrode material. The initial discharge specific capacity can reach up to 1314.2 mAh / g, and after 100 cycles, the specific capacity decay is only 20%. This catalyst material has broad application prospects for lithium-sulfur batteries.

The present disclosure provides a battery including a lithium, silicon or carbonaceous materials anode; a sulfur or composite sulfur material cathode prelithiated with a printable lithium composition comprised of lithium metal powder, a polymer binder compatible with the lithium metal powder, and a rheology modifier compatible with the lithium metal powder; an electrolyte; and an optional lithium modulating composition.

The invention relates to the technical field of polymer electrolytes, in particular to a composite solid electrolyte based on aramid nanofibers and a lithium-sulfur battery. The composite solid electrolyte is prepared by taking a composite aramid nanofiber membrane with a double-layer three-dimensional structure as a base material, an upper polyaniline base material provides good interface contact stability with a lithium negative electrode, and a lower aramid nanofiber skeleton provides good mechanical support performance for the fiber membrane; and meanwhile, the electrochemical performance of the composite solid electrolyte is comprehensively improved by doping the special porous structure of the composite solid electrolyte with the core-shell porous carbon.

The invention discloses a preparation method and application of an in-situ gel polymer electrolyte for a lithium-sulfur battery, and relates to a preparation method and application of a polymer electrolyte. The invention aims to solve the technical problems of rapid capacity attenuation and short cycle life of the existing lithium-sulfur battery. The method comprises the following steps: dissolving a lithium salt in a monomer or a solution formed by mixing the monomer and an ionic liquid, and then adding an initiator for polymerization to obtain the in-situ gel polymer electrolyte. The electrolyte can promote the formation of stable SEI, inhibit the growth of lithium dendrites, improve the ionic conductivity and accelerate the redox rate of positive electrode polysulfide, so that the cycle life of the lithium symmetric battery exceeds 1000h. The reversible specific discharge capacity of a lithium-sulfur battery assembled by using the electrolyte is 1242.0 mAh / g within the range of 1.7-2.8 V and under 0.2 C, the specific discharge capacity after 60 cycles is 953.7 mAh / g, the average coulombic efficiency is 97.5%, and the electrolyte can be used in the field of lithium-sulfur batteries.

The invention discloses a lithium-sulfur battery diaphragm, a lithium-sulfur battery and a preparation method of the lithium-sulfur battery diaphragm. Graphene oxide is reduced to obtain reduced graphene; the reduced graphene and the carbon black are dispersed in a dispersion medium to form dispersion liquid; and coating a diaphragm base material with the dispersion liquid, and drying to obtain the lithium-sulfur battery diaphragm. The lithium-sulfur battery diaphragm is arranged between a positive electrode and a negative electrode of a lithium-sulfur battery, the surface coated with the reduced graphene and carbon black composition faces one side of the positive electrode, and the lithium-sulfur battery is assembled. Therefore, the rGO / CB composite functional diaphragm disclosed by the invention realizes a synergistic effect on polysulfide, has excellent long-term cycling stability and good rate capability, has more obvious performance advantages in rapid charging and discharging scenes such as electric automobiles and unmanned aerial vehicles, and has a wide application prospect.

A power system including at least a lithium-sulfur (Li—S) battery module or pack and a second battery module or pack, different than the Li—S module or pack in composition, structure, or configuration, wherein (i) at least one of the Li—S module or pack and the second battery module or pack includes a first set of multiple bipolar electrodes internally connected in series; and (ii) the at least a lithium-sulfur (Li—S) battery module or pack and the second battery module or pack are internally or externally connected in parallel to form a power source. The power source May be connected in parallel to a supercapacitor, a fuel cell, a high-power battery, etc. The power system may further contain a controller, a DC / DC converter and / or a high-voltage bus electrically communicating with the controller. The power system may be used to power a vehicle or other device.

The application discloses an indium-based oxide catalyst, which is prepared by the following method: step one, adding indium nitrate, isophthalic acid, DMF, acetonitrile, imidazole and nitric acid into a reaction kettle, reacting at 80 DEG C for 12 hours, then heating to 100 DEG C and reacting for 24 hours, washing with DMF and anhydrous ethanol respectively, and vacuum drying for 12 hours to obtain an In-MOF precursor; step two, keeping the In-MOF precursor under the condition of nitrogen atmosphere and 200-600 DEG C for 4 hours, and naturally cooling to room temperature to obtain the indium-based oxide catalyst. Most of the prepared indium-based oxide catalysts still retain the corresponding three-dimensional hierarchical porous framework structure of the original MOF; the indium-based oxide catalyst contains highly dispersed metal active sites inside, effectively reduces the aggregation of metal oxides or metal elements, and thus exhibits more excellent catalytic activity; the organic ligand isophthalic acid generates a large amount of carbon material through pyrolysis under an inert atmosphere, greatly improving the conductivity of the indium-based oxide catalyst.

A lithium-sulfur battery including an anode structure, a cathode, a separator, and an electrolyte is provided. A protective layer may form within the anode structure responsive to operational discharge-charge cycling of the lithium-sulfur battery. The protective layer may include a polymeric backbone chain formed of interconnected carbon atoms collectively defining a segmental motion of the protective layer. Additional polymeric chains may be cross-linked to one another and at least some carbon atoms of the polymeric backbone chain. Each additional polymeric chain may be formed of interconnected monomer units. A plasticizer may be dispersed throughout the protective layer without covalently bonding to the polymeric backbone chain. The plasticizer may separate adjacent monomer units of at least some additional polymeric chains. Increasing separation of adjacent monomer units increases a cooperative segmental mobility of the additional polymeric chains and ionic conductivity of the protective layer.

The invention relates to the technical field of lithium-sulfur battery diaphragm materials and preparation thereof, and discloses a preparation method of a lithium-sulfur battery diaphragm modified material, which comprises the following steps: (1) preparing two MOF materials, namely Co-MOF and Mn-MOF, by a solvothermal method; (2) taking the Co-MOF and the Mn-MOF as raw materials, and preparing a CoSe / MnSe-N-C composite material derived from the Co-MOF and the Mn-MOF by utilizing a high-temperature sintering method; and (3) taking a CoSe / MnSe-N-C composite material derived from Co-MOF and Mn-MOF as a modifier, and adopting a coating method to obtain the modified PP diaphragm of the lithium-sulfur battery. According to the lithium-sulfur battery modified PP diaphragm provided by the invention, sulfur-loving sites, lithium-loving sites and catalytic electrode reaction active sites in the modifier CoSe / MnSe-N-C composite material can be utilized to effectively inhibit the shuttle effect of lithium polysulfide and the growth of lithium dendrites, the electrode reaction kinetics of the lithium polysulfide can be accelerated, and the overall electrochemical performance of the lithium-sulfur battery is greatly improved.

The invention discloses a preparation method and application of nickel-cobalt bimetallic phosphide for in-situ growth of nitrogen-doped carbon nanotubes. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; sequentially adding a cobalt source, a nickel source, a segmented copolymer, a phosphorus source and a nitrogen source into the graphene oxide dispersion liquid, and uniformly mixing to obtain a mixed solution; drying the mixed solution to obtain a precursor; and annealing the precursor in an inert atmosphere to obtain the product. According to the nitrogen-doped carbon material coated phosphide nano-particle composite material and the preparation method thereof, by regulating and controlling the ratio of Ni to Co, a carbon source grows on graphene in situ to form a carbon nano-tube, nickel-cobalt bimetal phosphide nano-particles are uniformly distributed on a nitrogen-doped carbon material to form the nitrogen-doped carbon material coated phosphide nano-particle composite material, and the nitrogen-doped carbon material coated phosphide nano-particle composite material is used as a modified diaphragm material of a lithium-sulfur battery. The preparation method disclosed by the invention has the advantages of mild reaction conditions and easiness in amplification and regulation, and the prepared composite material has a relatively high specific surface area and can be applied to the field of energy sources, especially the field of lithium-sulfur batteries.

The application discloses a high-performance separator coating for lithium battery positive electrodes and a processing method thereof, and belongs to the technical field of lithium battery materials, aiming to solve the problems of weak inhibition of polysulfides, difficult balance between ion transmission and blocking, poor high-temperature stability and low processing efficiency of the existing separator coating. The separator coating is composed of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, adopts a double-layer gradient structure with a low-porosity dense barrier in the inner layer and a high-porosity high-efficiency lithium transmission in the outer layer, and its processing method comprises composite sulfur carrier preparation, double-station alternating coating, gradient temperature vacuum drying and low-temperature plasma activation. The application realizes triple synergy of physical adsorption, chemical anchoring and catalytic conversion, so that the capacity retention rate of lithium-sulfur batteries after multiple cycles still reaches a high level, the thermal shrinkage rate of the coating is low, the product qualified rate is improved, and the application is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the long-cycle and high-safety requirements.

The invention relates to the field of lithium-sulfur batteries, and discloses a preparation method of a lithium-sulfur battery electrode modification material, which comprises the following steps: applying a thiophene unit-containing electrolyte additive to a lithium-sulfur battery; and preparing the electrode modification layer of the lithium-sulfur battery through an in-situ electrochemical polymerization reaction. The lithium-sulfur battery electrode modification material provided by the invention is beneficial to promoting conversion of polysulfide and inhibiting the shuttle effect of the polysulfide, and the overall electrochemical performance of the lithium-sulfur battery can be remarkably improved. In addition, the method can also be applied to the fields of sodium-sulfur batteries, potassium-sulfur batteries and other metal-sulfur batteries.

The invention belongs to the technical field of lithium metal batteries, and provides a lithium-sulfur battery negative electrode protection film, a preparation method and application thereof, and a lithium-sulfur battery. The lithium-sulfur battery negative electrode protection film provided by the invention comprises a carbon matrix (formed by interweaving nano carbon fibers) and an active metal compound (one or more of metal nitride, metal phosphide and metal telluride) embedded in the carbon matrix. The lithium-sulfur battery negative electrode protection film is arranged between the lithium negative electrode and the diaphragm, the lithium-sulfur battery negative electrode protection film has an independent and self-supporting structure, and compared with a scheme for pretreating and protecting the lithium negative electrode in the prior art, the lithium-sulfur battery negative electrode protection film is simple to operate and easier to industrialize. The lithium-sulfur battery negative electrode protective film provided by the invention has excellent mechanical strength, chemical stability and ionic conductivity, and can effectively inhibit the growth of lithium dendrites, protect the stability of an SEI (Solid Electrolyte Interphase) film and prolong the cycle life of a lithium negative electrode.

A method of manufacturing a lithium-sulfur battery in a cylindrical cell format is provided. In some aspects, the method includes providing an anode current collector and providing an anode on the anode current collector. The method may include depositing a protective layer on and along the length of the anode, providing a cathode current collector opposite to the anode, and providing a cathode on the cathode current collector. The method may include providing a separator between the anode and the cathode, disposing an adhesive carbon-containing layer along the bottom edge of the anode (e.g., to replace one or more conventional anode tabs), and dispersing an electrolyte throughout the lithium-sulfur battery. The method may include forming the lithium-sulfur battery in the cylindrical cell format by collectively winding into a jelly roll.