527 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 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 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 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.

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.

A lithium sulphur battery comprising a Li anode, a separator between the anode and cathode, a Li-containing electrolyte; and a sulphur-containing cathode; wherein the separator comprises a porous substrate carrying a metal-organic framework comprising at least two different metal ions one of which is an iron ion. Also, a process for the preparation of a cathode material for a Li—S battery comprising nucleating metal ions on a graphene oxide or reduced graphene oxide sheet such that the metal ions are chemically bound to the basal plane of the graphene oxide or reduced graphene oxide sheet; growing a metal-organic framework comprising said chemically bound metal ions by adding a polyfunctional ligand to form a metal organic framework bound to a reduced graphene oxide sheet (MOF@rGO); and infusing elemental sulphur into the metal organic framework to form S-MOF@rGO.

The application belongs to the field of carbon material preparation, and discloses a preparation method of self-supporting carbon nanotube and graphene hybrid material. The preparation method is as follows: two carbon sources with different carbon contents are added into a mixed solution of ethanol and water to form a suspension; the suspension is sprayed on the surface of a metal sheet, and after drying, the metal sheet is placed in a high-temperature furnace for high-temperature heating in a protective atmosphere; after the high-temperature furnace is cooled, the carbon material is taken off from the metal sheet, and then the carbon material is soaked in an acid solution, and then washed with water and dried to obtain the self-supporting carbon nanotube and graphene hybrid material. The method has the characteristics of simple operation, low cost, good product structure interconnection, and easy controllable macro preparation. The self-supporting carbon nanotube and graphene hybrid material can be used as a positive electrode carrier material of a lithium-sulfur battery.

This invention relates to a method for preparing high-purity phosphorus pentasulfide using a low-temperature liquid phase and its application, belonging to the technical field of key materials for lithium-sulfur batteries and solid-state batteries. It solves the technical problems of high reaction temperature and high energy consumption in existing phosphorus pentasulfide preparation processes. The method includes the following steps: Step 1: Select phosphorus pentachloride, dry it, and place the treated phosphorus pentachloride in an organic solvent to form a suspension or slurry system; Step 2: Place the suspension or slurry system in a closed reactor; Step 3: Introduce a sulfur source into the reactor to allow phosphorus pentachloride to undergo a sulfidation reaction with the sulfur source; Step 4: Raise the temperature to a set point and maintain a deep sulfidation reaction to generate phosphorus pentasulfide; Step 5: After the reaction, cool, separate the solid and liquid phases, and dry to obtain the solid product of phosphorus pentasulfide. This invention features mild reaction conditions, a simplified process flow, high safety, and recyclable solvents, making it suitable for continuous and large-scale production.

This invention provides a method for preparing MXene-derived single-atom catalyst materials using ionic liquid-assisted synthesis. The method includes the following steps: (1) Synthesizing NBF-Ni-LDH / Mo2CT x The mixture consists of Ni(NO3)2·6H2O, urea, C6H8O7·H2O, 1-ethyl-3-methylimidazolium tetrafluoroborate, and Mo2CT. x Add to deionized water, mix well, heat, wash, and dry to obtain NBF-Ni-LDH / Mo2CT x (2) Synthesis of NBF-NiSe2 / Mo2CT x : NBF-Ni-LDH / Mo2CT x Sintering was performed in an Ar / H2 atmosphere to obtain the product NBF-NiSe2 / Mo2CT. x (3) Synthesis of Pt / NBF-NiSe2 / Mo2CT x : PtCl4 and NBF-NiSe2 / Mo2CT x The sample was placed in ethanol, stirred, dried, sintered, washed, and dried to obtain the single-atom catalyst material Pt / NBF-NiSe2 / Mo2CT. x The method of this invention is simple and controllable, and can effectively alleviate the "shuttle effect" of polysulfides in lithium-sulfur batteries, catalyze the conversion of polysulfides, promote the redox reaction kinetics of lithium-sulfur batteries during charge and discharge, thereby improving the discharge capacity of the battery and improving cycle stability.

The positive electrode for a lithium-sulfur battery according to the present invention contains a predetermined amount of polyacrylic acid, polyacrylamide, carboxymethyl cellulose, and styrene-butadiene rubber as a binder polymer. When used in a lithium-sulfur battery, the positive electrode for a lithium-sulfur battery can ensure high adhesive strength between the positive electrode active material layer and the positive electrode current collector, and sufficient output performance.

The invention discloses a PEO-based solid electrolyte capable of adsorbing polysulfide and a preparation method of the PEO-based solid electrolyte, and relates to the technical field of sulfur lithium batteries, the preparation method comprises the following steps: 1) preparing PEO solid electrolyte slurry; and 2) preparing the solid electrolyte film. The H-Beta molecular sieve added into the electrolyte can effectively destroy a PEO crystalline region, adsorb polysulfide and improve the ionic conductivity; the bacterial cellulose skeleton provides mechanical strength and inhibits growth of lithium dendrites. The ionic conductivity of the electrolyte reaches 2.37 * 10 <-4 > Scm <-1 > at the temperature of 60 DEG C, when the electrolyte is applied to a lithium-sulfur battery, the specific capacity of about 350 mAhg <-1 > can still be kept after 400 cycles at the rate of 1C, excellent cycle stability is shown, and the shuttle effect of polysulfide is effectively inhibited.

The application provides a phosphorus-aluminum inorganic adhesive for a lithium-sulfur battery and a preparation method thereof. The phosphorus-aluminum inorganic adhesive with a viscosity of 10-500 mPa.s and a solid content of 30-80% is prepared through a hydrothermal reaction of a phosphoric acid or hydrogen phosphate solution and an aluminum compound. The product has the characteristics of good strength, high-temperature resistance, and flame resistance. Compared with a traditional organic adhesive, the phosphorus-aluminum inorganic adhesive significantly reduces the use amount of the lithium-sulfur battery, increases the adhesion of the electrode material and the current collector, limits the diffusion of lithium polysulfide, enhances the transport capacity of lithium ions, and prolongs the cycle life of the battery. More importantly, the phosphorus-aluminum adhesive has excellent flame resistance, and when applied to the lithium-sulfur battery, the flame resistance of the battery can be improved, the use safety of the battery is improved, and the phosphorus-aluminum adhesive is expected to become a new type of environmentally-friendly flame-resistant lithium-sulfur battery adhesive.

The present invention relates to a positive electrode for a lithium-sulfur battery comprising a sulfur-carbon composite having a plurality of island-shaped carbon coatings on the surface thereof, and a lithium-sulfur battery comprising the same. The positive electrode for a lithium-sulfur battery according to the present invention has excellent electrochemical reactivity, which results in a lithium-sulfur battery comprising the same having high capacity, high output, and long cycle life.

The invention relates to the technical field of lithium-sulfur battery positive electrode materials, in particular to a metal organic framework-based porous cubic composite material and a preparation method and application thereof, the preparation method is simple, and the obtained composite material is applied to a positive electrode of a lithium-sulfur battery and can improve the discharge capacity and the initial efficiency. The preparation method comprises the following steps: (1) performing high-temperature treatment on a metal organic framework ZIF-67 at a first temperature in an inert gas atmosphere to obtain ZIF-67 after heat treatment; the first temperature ranges from 500 DEG C to 900 DEG C; (2) in an inert gas atmosphere, the ZIF-67 subjected to heat treatment is subjected to phosphating in the presence of a phosphating agent at a second temperature, so that Co in the ZIF-67 subjected to heat treatment is partially phosphated; the second temperature is 100 to 500 DEG C; and (3) grinding the product obtained in the step (2) to obtain the composite material.

The invention provides a polymer monomer, a non-aqueous composite solid-state electrolyte, a composite diaphragm, a lithium ion battery and a preparation method, the non-aqueous composite solid-state electrolyte is obtained by compounding a polymer with an inorganic solid-state electrolyte, the structure of the polymer monomer is designed, and the non-aqueous composite solid-state electrolyte is prepared on the basis of alkylene oxide with relatively high lithium ion conductivity. And sulfonate / sulfonyl groups are introduced. The problem of electrode interface contact of an existing inorganic solid electrolyte is solved, the oxidation resistance of the polymer is improved, the polarity of the polymer is improved, the dissociation capacity of lithium ions of the inorganic solid electrolyte is improved, a transmission channel is established for transmission of the lithium ions, transmission of the lithium ions is promoted, and the service life of the electrolyte is prolonged. The conductivity and the transference number of lithium ions are increased, so that the electrochemical performance of the battery and the transference capability of the lithium ions are improved, the development of the lithium ion battery is promoted, and the lithium ion battery can be applied to the fields of secondary batteries such as lithium ion batteries (including aqueous lithium ion batteries), lithium metal batteries and lithium sulfur batteries.

The application provides a doped rare earth oxide / carbon nanotube functional diaphragm for a battery and a preparation method thereof. 2‑x The functional diaphragm comprises a diaphragm base and a functional layer laid on one side surface of the diaphragm base, wherein the functional layer is composed of a lanthanum-doped cerium oxide / carbon nanotube (La-CeO 2‑x / CNT) composite material. In the functional diaphragm, the hydroxylated carbon nanotubes are interwoven to form a conductive network, which can not only physically block the migration of polysulfides but also construct a continuous electron transmission channel; the La doping causes the lattice distortion of CeO2 and promotes the generation of oxygen vacancies, thereby enhancing the chemical adsorption capacity of polysulfides and accelerating the conversion reaction kinetics, and further inhibiting the shuttle effect of lithium-sulfur batteries. The lithium-sulfur battery assembled based on the La-CeO 2‑x / CNT functional diaphragm exhibits high specific capacity, excellent rate performance and long cycle stability.

A material includes sulfur, and a quantum dot component. The quantum dot component is at least one component selected from the group consisting of: a quantum dot-nanotube composite, a quantum dot-graphene composite, carbon quantum dots consisting essentially of carbon, and hybrid quantum dots comprising carbon and at least one metal oxide. Another material includes sulfur, a carbon quantum dot composite material and an electrically conductive component. The carbon quantum dot composite material includes a carbon source, carbon nanotubes and at least one metal and / or metalloid selected from the group consisting of tungsten, molybdenum, ruthenium, niobium, tantalum, germanium, iron, silver, manganese, titanium, tin, antimony, bismuth, gold, silicon, nickel, cobalt, chromium, zirconium, and vanadium; or oxide thereof; and combinations thereof. The material may be used in a lithium-sulfur battery. This may overcome or partially overcome the shuttle effect.

This invention relates to the field of new energy materials technology, specifically to a polymer solid electrolyte, its preparation method, and its application in solid-state lithium-sulfur batteries. The solid electrolyte is composed of polyethylene oxide, a selenium-containing substance, and a lithium salt. First, polyethylene oxide and the selenium-containing substance are mixed and heat-treated to obtain a composite product. Then, the composite product and the lithium salt are dissolved in a solvent, stirred, and mixed to obtain a mixed solution. The mixed solution is transferred to a separator and vacuum-dried to obtain the polymer solid electrolyte. This invention uses a heat treatment process to composite polyethylene oxide and the selenium-containing substance, forming a rapid lithium-ion transport channel within the electrolyte. This solid electrolyte exhibits high ionic conductivity, effectively promotes the reaction kinetics of the sulfur cathode material, and stabilizes the lithium anode. Solid-state lithium-sulfur batteries using the solid electrolyte prepared according to this invention exhibit high capacity utilization and stable cycle characteristics.

The present invention relates to a positive electrode active material for a lithium-sulfur battery and a manufacturing method therefor, the positive electrode active material for a lithium-sulfur battery comprising a composite of a sulfur-based substance, a metal halide salt, and a carbon-based material doped with a transition metal.

The application relates to a preparation method of a lithium battery positive electrode and a lithium battery and relates to the new energy field.The preparation method of the lithium battery positive electrode comprises the following steps: taking a carbonizable polymer as a material, preparing a fiber film through electrostatic spinning; performing heat treatment on the fiber film to obtain a carbon fiber film; providing a nano sulfur particle suspension and a binder solution; performing suction filtration treatment on the nano sulfur particle suspension and the binder solution by taking the carbon fiber film as a filter membrane to obtain a prefabricated positive electrode; and drying the prefabricated positive electrode to obtain the lithium battery positive electrode.The application provides a large buffer space for volume changes in the mutual conversion process of sulfur and lithium sulfide, and can effectively improve the problem of low positive electrode conductivity of a lithium-sulfur system.In addition, the suction filtration treatment has the advantages of simple operation and easy control of the morphology of sulfur.

本发明涉及一种锂硫电极中硫化锂的品质分析方法，作为分析锂硫活性材料中残留锂化合物的方法，所述分析方法包括：准备包括正极活性材料的电极的步骤；对所述电极进行充放电，以获取关于随容量(Specific Capacity)变化的电压(Voltage)的第一数据的步骤；以及基于所述第一数据，通过对随所述电压(V)变化的电池容量(Q)对所述电压(V)的微分值(dQ / dV)进行积分，获取并分析根据计算出的面积值而得到的数据的步骤。

In general, the present disclosure is directed to methods and compositions for producing a sulfur cathode. The method includes dry mixing sulfur particles and a binder; adding a carbon source to the dry mixture; contacting the resulting dry mixture comprising the carbon source, the sulfur particles, and the binder with a solvent to form a cathode slurry; and removing the solvent from the cathode slurry to form the sulfur cathode, wherein the sulfur cathode comprises a porous shell structure covering the sulfur particles.

The present disclosure belongs to the technical field of lithium-sulfur batteries, and discloses covalent triazine framework polymer nanosheets for cathode materials in lithium-sulfur batteries. The hexaazatriphenylenehexacarbonitrile monomer on the surface of sodium chloride is polymerized through high temperature triazine, sodium chloride crystal is removed to obtain covalent triazine framework polymer nanosheets product, and cathode materials in lithium-sulfur batteries are obtained after melting sulfur. The preparation method of the present disclosure is simple, has low cost, high yield, and uniform structure. The obtained material itself has a porous structure and numerous active sites. When used in lithium-sulfur batteries, it can promote the rapid conversion of lithium polysulfides, effectively suppress the shuttle effect, and improve the rate performance and cycle performance of lithium-sulfur batteries.

This invention provides a composite cathode material for lithium-sulfur batteries, its preparation method, and its application. The preparation method of the composite cathode material for lithium-sulfur batteries provided by this invention includes: firstly, using carbon fiber cloth as a substrate, depositing a nickel source on the surface of the carbon fiber cloth, and then heat-treating the carbon fiber cloth with the deposited nickel source in an inert gas atmosphere to form metallic nickel nanoparticles and create pores within the carbon fiber cloth; after heat treatment, etching with an acid solution to remove the metallic nickel nanoparticles and obtain a porous carbon fiber framework; secondly, in-situ generating a bimetallic sulfide NiCo2S4 on the porous carbon fiber framework; finally, melting and combining the porous carbon fiber framework with the in-situ grown bimetallic sulfide NiCo2S4 with elemental sulfur to obtain the composite cathode material for lithium-sulfur batteries. The composite cathode material provided by this invention can significantly suppress the shuttle effect of the lithium-sulfur battery cathode, improve sulfur loading and reaction kinetics, thereby obtaining a high-performance lithium-sulfur battery.

The application discloses a kind of cobalt-cobalt disulfide heterojunction embedded nitrogen-sulfur co-doped carbon nanocage positive electrode material preparation and application in lithium-sulfur battery, belong to lithium-sulfur battery positive electrode sulfur host preparation field;Among them, lithium-sulfur battery positive electrode material includes Co / CoS2@NSC nanocage and sublimed sulfur;Lithium-sulfur battery is assembled to lithium-sulfur battery positive electrode material using the application, and the electrochemical performance of each aspect is significantly improved, and the preparation process of the lithium-sulfur battery positive electrode material is simple, and battery assembling process is simple, and cost can be reduced.

The application provides a preparation method of a two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst and application thereof, and belongs to the field of nanometer material preparation. First, alanine, potassium nitrate, a manganese salt and a ruthenium salt are put into a grinding device, deionized water is added for grinding, and then drying is performed; then, preheating is performed through a heating device, and then calcination is performed; finally, the two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst is obtained after washing and separation. The two-dimensional Ru-Mn3O4 lithium-sulfur battery positive electrode catalyst material prepared by the method has low cost, high efficiency, can fully exert the synergistic advantages of element doping and two-dimensional structure, and can significantly improve the application performance in lithium-sulfur batteries.