870 results about "Lithium sulfur" patented technology

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.

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.

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.

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 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 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 invention discloses a polymer solid electrolyte, which is composed of the following components: a polymer substrate; a lithium salt; the composite filler is IL (at) ZIF-67 formed by compounding ZIF-67 and an ionic liquid; and a solvent. The ionic liquid is used as a plasticizer, and the EmimTFSI can effectively weaken the intermolecular acting force between polymer chains and increase the free volume and movement ability of the polymer chains. ZIF-67 has abundant Lewis acid sites (Co < + >), and the sites can form weak coordination with LiTFSI, so that the ionic conductivity is further improved. The introduction of the composite filler is beneficial to improving the interface stability of the polymer electrolyte and the lithium metal negative electrode and inhibiting the growth of lithium dendrites, so that the cycle life of the battery is prolonged. The polymer solid electrolyte membrane prepared on the basis of the preparation method is applied to a solid-state lithium-sulfur battery, and the cycling stability, the rate capability and the coulombic efficiency of the battery can be remarkably improved.

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.

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.

The present invention discloses a composite carbon nanotube material containing sulfur and carbon nanotubes. The carbon nanotubes are curved or spiral in shape, have transition metal nanoparticles at their ends, and are hollow. The composite carbon nanotube material can be used in lithium-sulfur batteries to mitigate sulfur expansion, promote uniform sulfur distribution, reduce polysulfide shuttling, and improve the capacity, rate capability, and cycle stability of lithium-sulfur batteries.

The invention discloses a preparation method and application of an all-solid-state lithium-sulfur battery composite solid electrolyte, and belongs to the technical field of all-solid-state lithium-sulfur batteries. The preparation method comprises the following steps: firstly, preparing organic metal framework MOF particles with an ordered porous structure by adopting an oil bath method, taking polyethylene oxide as a substrate, adding an inorganic filler to prepare a composite polymer electrolyte membrane, and adding the MOF particles on the basis of the electrolyte membrane to prepare the composite solid electrolyte CPE-MOF. The MOF material prepared by the method shows a typical cubic structure, has a micron size, has good repeatability and controllability, and lays a solid foundation for research and application of subsequent material performance. The composite solid electrolyte prepared by the invention is applied to an all-solid-state lithium-sulfur battery, and shows relatively high specific discharge capacity, stable cycle performance and good rate capability.

The application discloses a modified polyvinylidene fluoride lithium-sulfur battery positive electrode binder and a preparation method thereof, and belongs to the technical field of lithium-sulfur batteries. In the method, a modifier is connected to a polyvinylidene fluoride molecular chain through hydrogen bonds, cross-linking of the polyvinylidene fluoride molecular chain is realized, and the mechanical property of the polyvinylidene fluoride binder is improved. The introduction of the modifier reduces the crystallinity of the polyvinylidene fluoride, increases the porosity, promotes the swelling of the polyvinylidene fluoride binder in electrolyte, and increases the lithium ion conductivity. Meanwhile, the metallocycle connected to the iron atom in the modifier not only provides an adsorption site for lithium polysulfide, but also promotes the conversion of the lithium polysulfide. The modified polyvinylidene fluoride binder obtained by the method has the advantages of simple synthesis process and low cost, can significantly reduce sulfur positive electrode polarization when applied in a lithium-sulfur battery positive electrode, improves the cycle stability and rate performance of the battery, is suitable for traditional lithium battery electrode preparation processes, and is suitable for large-scale commercial application.

The invention relates to the technical field of battery materials, and discloses a lithium-sulfur battery catalyst, a preparation method thereof and a lithium-sulfur battery. According to the lithium-sulfur battery catalyst, particles of the catalyst comprise an MXTiO base material and alpha-Fe2O3 deposited on the surface of the MXTiO base material; the MXTiO base material comprises an MXene nanosheet and a titanium oxide layer covering the surface of the MXene nanosheet; the metal element in the MXene nanosheet is Ti. The preparation method comprises the following steps: carrying out hydrothermal reaction on MXene to generate titanium oxide on the surface of MXene to obtain an MXTiO material; preparing a mixed dispersion liquid, wherein iron ions are dissolved in the mixed dispersion liquid, and an MXTiO material is dispersed in the mixed dispersion liquid; alkali liquor is added into the mixed dispersion liquid, ferric hydroxide is precipitated on the surfaces of particles of the MXTiO material, then a reaction product is calcined, and the MXTiO / alpha-Fe2O3 heterostructure material is obtained. The catalyst shows excellent electro-catalytic performance in the lithium-sulfur battery.

The invention discloses a FeOOH / CNT composite layer modified diaphragm for a lithium-sulfur battery and a preparation method of the FeOOH / CNT composite layer modified diaphragm. The diaphragm takes a polypropylene diaphragm as a substrate, the surface of the diaphragm is modified with a composite layer composed of FeOOH and CNT, and the diaphragm is of a winding bar winding structure. The one-step synthesis is adopted, the reaction conditions are mild, and the process is simple. FeOOH enhances the adsorption effect on polysulfide by exposing abundant active sites, effectively inhibits the shuttle effect and improves the redox reaction kinetics; meanwhile, the CNT constructs a three-dimensional conductive network, the electron transmission path is shortened, and the sulfur positive electrode utilization rate and the interface conductivity are improved. Experimental results show that the initial specific capacity of the lithium-sulfur battery assembled based on the modified diaphragm reaches 1218.3 mAh g <-1 > at 0.2 C, the capacity fading rate of each circle is only 0.075% after 500 circles of circulation at 1C, and the lithium-sulfur battery shows excellent cycle stability and high specific capacity. The diaphragm provides an effective solution for improving the electrochemical performance of the lithium-sulfur battery, and has important application potential.

The invention discloses a hematite microtube catalyst based on a biological template as well as a preparation method and application of the hematite microtube catalyst, and belongs to the technical field of lithium-sulfur batteries. The preparation method of the hematite microtube catalyst based on the biological template comprises the following steps: transferring mycorrhiza to an iron-source-containing organic solid culture medium for cultivation, then selecting single colonies, transferring the single colonies to an iron-source-containing organic liquid culture medium, and carrying out standing culture to obtain a catalyst precursor; and sequentially carrying out reduced pressure suction filtration and freeze drying on the catalyst precursor, and annealing in an oxidizing atmosphere to obtain the hematite microtube catalyst based on the biological template. The invention further discloses the hematite microtube catalyst based on the biological template and application of the hematite microtube catalyst. The hematite microtube catalyst based on the biological template can solve the problems of capacity fading and poor cycling stability caused by polysulfide shuttle effect, low conductivity and volume expansion of the existing lithium-sulfur battery positive electrode material, and has great application potential.

An lithium-sulfur battery including an anode structure, a cathode, a separator, and an electrolyte is provided. The electrolyte may be dispersed throughout the cathode and in contact with the anode. An artificial solid-electrolyte interphase (A-SEI) may form on the anode, and a protective layer (e.g., that may be pinhole free) may form within and / or on the A-SEI to face the cathode. The protective layer may be formed from carbonaceous materials, which may provide exposed carbon atoms grafted with one or more ions, such as fluorine anions (F−), uniformly dispersed throughout the protective layer. In addition, the protective layer may include polymeric chains positioned generally opposite to each other. The polymeric chains may cross-link upon exposure to ultraviolet (UV) energetic radiation to form a three-dimensional (3D) lattice having a defined cross-linking density suitable to trap one or more anions during discharge-charge operational cycling of the lithium-sulfur battery.

The invention discloses a preparation method of a self-supporting composite sulfur positive electrode material and application of the self-supporting composite sulfur positive electrode material in a lithium-sulfur battery, relates to a preparation method and application of a self-supporting positive electrode material of the lithium-sulfur battery, and aims to solve the problems of poor catalytic activity and poor stability of the self-supporting positive electrode material of the existing lithium-sulfur battery. The method comprises the following steps: 1, preparing nanorod-shaped manganese-doped titanium dioxide; 2, loading the catalyst on a carbon source; and 3, loading an active substance to obtain the self-supporting composite sulfur positive electrode material. According to the method, a binder is not used, the mechanical property is good, a three-dimensional conductive network and a smooth ion migration channel are provided, the volume expansion before and after the positive electrode reaction can be effectively relieved through abundant macropores, and the nanorod-shaped TiO2-Mn has catalytic activity and can effectively catalyze the conversion from long-chain lithium polysulfide to short-chain lithium polysulfide, so that the preparation process is simple, and the preparation cost is low. And the loss of active substances in the charging and discharging process of the lithium-sulfur battery is reduced. And the specific discharge capacity under the high current density of 3C is 475.53 mAh / g, so that the lithium-sulfur battery can be used in the field of lithium-sulfur batteries.

The invention relates to a host material for an electrode of a lithium-sulfur battery and a preparation method of the host material. According to the invention, a template is constructed by using a spray pyrolysis process, and the host material for the electrode of the lithium-sulfur battery is finally obtained, and is element-doped graphdiyne with a hollow multi-shell structure. The graphdiyne with a hollow multi-shell structure is doped by doping agents such as a boron source, a nitrogen source, a phosphorus source and a sulfur source, and due to introduction of doping elements, the graphdiyne material has high catalytic activity, can be used for catalyzing oxidation reduction of sulfur species, is beneficial to adsorption of polysulfide and limits the shuttle effect. Through the synergistic effect of the two, the performance of the lithium-sulfur battery can be further improved, and the comprehensive improvement of the energy density, the cycling stability and the rate capability of the lithium-sulfur battery is realized.

The invention relates to the field of sulfide solid-state batteries, and discloses a preparation method of a mixed conducting layer coated sulfide electrolyte and application of the mixed conducting layer coated sulfide electrolyte to an all-solid-state lithium-sulfur battery positive electrode. And carrying out ball milling on the obtained mixed material by using a planetary ball mill according to specific parameters, so as to obtain the sulfide electrolyte with the mixed conductive coating layer. The mixed conductive coating layer can be used as a solid-state lithium-sulfur battery positive electrode conductive additive; contact between the carbon material and the internal electrolyte can be limited, and decomposition of the internal electrolyte is prevented; the Young modulus is lower, so that all the components are in better contact; when being applied to a composite positive electrode of a solid-state lithium-sulfur battery, the composite positive electrode can generate oxidation-reduction activity in a battery charging and discharging process, so that the capacity of the battery is improved; on the basis of the four points, the composite positive electrode electrolyte is favorably inhibited from being decomposed, the interface contact of the solid-state battery is favorably improved, and the capacity of the battery is favorably improved.

The invention relates to the technical field of battery electrodes, and discloses an integrated electrode and a preparation method thereof. The method comprises the following steps: pre-oxidizing, carbonizing and cutting a fiber precursor to obtain carbonized fiber; activating the carbonized fibers to obtain porous fibers; combining the porous cellosilk with an energy storage battery electrode active material through a vapor deposition reaction to obtain active cellosilk; and coating the active fibers with a conductive and / or ion-conductive coating material to obtain the integrated electrode. Through the synergistic effect of the porous carbon skeleton structure design, the vapor deposition active substance and the surface coating, the problem that an active material is easy to separate from a current collector in the charging and discharging process of a traditional electrode is solved, the electrode manufacturing process is simplified, and the prepared self-supporting integrated electrode has high specific capacity, excellent cycling stability and rate capability and is suitable for large-scale popularization and application. The material can be applied to energy storage equipment such as lithium ion batteries, sodium ion batteries, lithium-sulfur batteries, solid-state batteries and the like.