601 results about "Polysulfide" patented technology

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 relates to a solid-phase preparation method and application of battery-grade lithium sulfide, and the preparation method comprises the following steps: (1) firstly, adopting industrial-grade lithium carbonate as a raw material, and carrying out pretreatment purification to remove sodium-calcium-magnesium metal ion impurities; (2) carrying out ball-milling mixing on the purified lithium carbonate raw material and sulfur powder, and carrying out low-temperature melting pre-sintering; (3) performing primary high-temperature calcination on the lithium carbonate and sulfur powder mixture under a protective atmosphere to synthesize a lithium sulfide crude product; (4) carrying out secondary high-temperature calcination on the lithium sulfide crude product in a protective atmosphere to remove excessive sulfur impurities and lithium polysulfide impurities so as to obtain purified lithium sulfide; and (5) carrying out ball milling and crushing on the obtained lithium sulfide, and screening to obtain the battery-grade lithium sulfide with different particle sizes. According to the preparation method, a high-temperature solid-phase synthesis method is adopted, and low-temperature melting pre-sintering and high-temperature two-step calcining methods are adopted, so that reaction byproducts are gas and are easy to remove, production and preparation of high-purity battery-grade lithium sulfide can be realized, and the product has excellent electrochemical performance.

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 present invention provides a composite positive electrode for an all-solid-state lithium-sulfur battery and a method for preparing the same, belonging to the technical field of positive electrode materials for lithium-sulfur batteries. The composite positive electrode comprises a sulfur / carbon composite material with a gradient surface modification of phosphorus polysulfide and a solid electrolyte. The composite material comprises porous carbon, sulfur, and phosphorus polysulfide, with the sulfur loaded on the outer surface and / or in the pores of the porous carbon, and a phosphorus polysulfide layer with a gradient distribution of a specific structure on the surface of the sulfur / carbon composite. The present invention utilizes the sulfur / carbon composite material with a gradient surface modification of phosphorus polysulfide as a positive electrode material for an all-solid-state lithium-sulfur battery, effectively increasing the active sulfur content and specific capacity of the composite positive electrode layer. The composite positive electrode of the present invention can have an active sulfur content exceeding 50 wt%, a specific capacity calculated based on elemental sulfur exceeding 1300 mAh / g, and a specific capacity based on the total mass of the composite positive electrode exceeding 650 mAh / g. Furthermore, the composite positive electrode exhibits excellent cycle and rate 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 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 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 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 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.

Myriad problems with state of the art lithium based batteries, particularly electrolyte systems thereof, including but not limited to polysulfide shuttling, formation of lithium dendrites and dead lithium during stripping and plating, thermal runaway, volumetric expansion, and strict requirements for electrolyte composition, are well documented in the art and remain major obstacles to realizing the unsurpassed potential for lithium-based batteries as ideal energy storage solutions. The inventive concepts presented herein address said challenges from a multi-pronged approach, revolutionizing the electrolyte system from different approaches to produce synergistic benefits, both within the individual approaches and particularly in combination. The inventive concepts improve electrolyte systems with respect to solvents, electron withdrawing compounds, lithium ion-transporting compounds, performance enhancing additives and chalcogenides. These developments provide benefits including: improved charge / discharge capacity, Coulombic efficiency, cycle life, sulfur optimization, oxidative stability, etc. while reducing polysulfide shuttling and lithium dendrite formation, among other benefits.

The invention discloses a method for preparing electrolytic manganese dioxide from low-grade manganese oxide ore, the electrolytic manganese dioxide and application of the electrolytic manganese dioxide, and belongs to the technical field of battery materials. The method comprises the steps that S1, the low-grade manganese oxide ore is subjected to two-stage countercurrent acid leaching, and a leaching solution is obtained; s2, adjusting the pH value of the leachate, synchronously introducing air, adding a flocculating agent, and settling to remove iron and aluminum; s3, heavy metal is deeply removed, calcium and magnesium are removed through manganese fluoride, and then an oxidizing agent is added for oxygenolysis of polysulfide; s4, anolyte generated in the electrolysis process is added into the purified solution, Mn < 2 + > is subjected to catalytic oxidation through a catalyst, and generated authigenic MnO2 adsorbs residual impurities; and S5, pulse on-off current and periodic reversing are adopted for electrolysis, cathode waste liquid is reused for the leaching procedure in the S1, and electrolytic manganese dioxide is obtained. The electrolytic manganese dioxide with high purity and excellent electrochemical performance is successfully prepared through the specific steps of acid leaching iron removal, heavy metal removal, oxidation reaction, electrolysis and the like.

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.

Exemplary cathode materials include a mixture of an electroactive sulfur material (e.g., S8) and a blended non-sulfur electroactive material comprising two or more non-sulfur electroactive materials, wherein the blended non-sulfur electroactive material is selected such that a discharge voltage profile of the blend of intercalation materials—considered apart from the sulfur electroactive material—has a discharge voltage profile that has substantial overlap with the discharge voltage profile of the sulfur electroactive material. For example, in typical ether electrolytes commonly used in sulfur batteries the discharge voltage profile of S8-Li2S conversion has multiple plateaus (e.g., two plateaus) due to the multistep conversion of sulfur to soluble / intermediate polysulfides (PS) followed by progression to solid or quasi-solid products (e.g., Li2S2 / Li2S). By matching this discharge profile with a provided blend of non-sulfur electroactive materials, the rate and efficiency characteristics of the sulfur cathode can be improved throughout the battery discharge process.

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 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 relates to a water treatment agent for advanced treatment of thallium-containing wastewater in nonferrous metallurgy. The water treatment agent is prepared by fully mixing and uniformly stirring the following raw materials in parts by weight: 50-80 parts of a sodium diethyldithiocarbamate aqueous solution with the mass concentration of 5%-15%, 10-40 parts of sulfide or polysulfide and 10-40 parts of sodium thiosulfate. The water treatment agent provided by the invention can realize efficient removal of heavy metal ions, does not need a subsequent treatment process, not only simplifies the treatment process, but also reduces the treatment cost.

Myriad problems with state of the art lithium based batteries, particularly electrolyte systems thereof, including but not limited to polysulfide shuttling, formation of lithium dendrites and dead lithium during stripping and plating, thermal runaway, volumetric expansion, and strict requirements for electrolyte composition, are well documented in the art and remain major obstacles to realizing the unsurpassed potential for lithium-based batteries as ideal energy storage solutions. The inventive concepts presented herein address said challenges from a multi-pronged approach, revolutionizing the electrolyte system from different approaches to produce synergistic benefits, both within the individual approaches and particularly in combination. The inventive concepts improve electrolyte systems with respect to solvents, electron withdrawing compounds, lithium ion-transporting compounds, performance enhancing additives and chalcogenides. These developments provide benefits including: improved charge / discharge capacity, Coulombic efficiency, cycle life, sulfur optimization, oxidative stability, etc. while reducing polysulfide shuttling and lithium dendrite formation, among other benefits.

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.

Myriad problems with state of the art lithium based batteries, particularly electrolyte systems thereof, including but not limited to polysulfide shuttling, formation of lithium dendrites and dead lithium during stripping and plating, thermal runaway, volumetric expansion, and strict requirements for electrolyte composition, are well documented in the art and remain major obstacles to realizing the unsurpassed potential for lithium-based batteries as ideal energy storage solutions. The inventive concepts presented herein address said challenges from a multi-pronged approach, revolutionizing the electrolyte system from different approaches to produce synergistic benefits, both within the individual approaches and particularly in combination. The inventive concepts improve electrolyte systems with respect to solvents, electron withdrawing compounds, lithium ion-transporting compounds, performance enhancing additives and chalcogenides. These developments provide benefits including: improved charge / discharge capacity, Coulombic efficiency, cycle life, sulfur optimization, oxidative stability, etc. while reducing polysulfide shuttling and lithium dendrite formation, among other benefits.

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 discloses a lithium battery positive electrode high-performance diaphragm coating and a processing method, belongs to the technical field of lithium battery materials, and aims to solve the problems of weak polysulfide shuttling inhibition, difficulty in balancing ion transmission and barrier properties, poor high-temperature stability and low processing efficiency of an existing diaphragm coating. The diaphragm coating consists of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, and adopts a double-layer gradient structure with low porosity of an inner layer for compact blocking and high porosity of an outer layer for efficient lithium transmission; the processing method comprises the steps of preparation of the composite sulfur carrier, double-station alternate coating, gradient heating vacuum drying and low-temperature plasma activation. According to the invention, triple synergy of physical adsorption, chemical anchoring and catalytic conversion is realized, so that the capacity retention ratio of the lithium-sulfur battery after multiple cycles still reaches a relatively high level, the thermal shrinkage rate of the coating is relatively low, the product percent of pass is improved, and the method is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the requirements of long cycle and high safety.

The invention discloses a sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation methods of lithium-sulfur battery electrode materials, the method comprises the following steps: dispersing biomass derived porous carbon in an ethylene glycol solution dissolved with niobium pentachloride, and sequentially performing hydrothermal reaction to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. The preparation method comprises the following steps: firstly, preparing a porous carbon composite material, calcining the porous carbon composite material, performing calcination reaction on the porous carbon composite material and melamine at the same time, finally mixing the porous carbon composite material with elemental sulfur, and performing heat treatment to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. Lamellar niobium oxide / niobium nitride is utilized to increase polysulfide adsorption and catalytic conversion sites, a built-in electric field generated by constructing a niobium-based heterojunction is utilized to promote the electron transfer rate in the polysulfide conversion process, the electrode reaction kinetics is accelerated, and biomass derived porous carbon is utilized to improve the matrix conductivity and inhibit the shuttle effect of polysulfide, so that the conversion efficiency of the polysulfide is improved. The cycle performance and the service life of the lithium-sulfur battery are synergistically improved.

Myriad problems with state of the art lithium based batteries, particularly electrolyte systems thereof, including but not limited to polysulfide shuttling, formation of lithium dendrites and dead lithium during stripping and plating, thermal runaway, volumetric expansion, and strict requirements for electrolyte composition, are well documented in the art and remain major obstacles to realizing the unsurpassed potential for lithium-based batteries as ideal energy storage solutions. The inventive concepts presented herein address said challenges from a multi-pronged approach, revolutionizing the electrolyte system from different approaches to produce synergistic benefits, both within the individual approaches and particularly in combination. The inventive concepts improve electrolyte systems with respect to solvents, electron withdrawing compounds, lithium ion-transporting compounds, performance enhancing additives and chalcogenides. These developments provide benefits including: improved charge / discharge capacity, Coulombic efficiency, cycle life, sulfur optimization, oxidative stability, etc. while reducing polysulfide shuttling and lithium dendrite formation, among other benefits.

The invention relates to a preparation method of an intrinsic flame-retardant organic framework compound as well as a product and application thereof, and belongs to the technical field of battery materials. The flame-retardant organic framework compound disclosed by the invention is formed by competitive coordination of organic flame-retardant molecules rich in N / P / halogen, traditional organic ligands and metal ions, and the introduction of the flame retardant endows excellent flame-retardant performance, so that continuous combustion is prevented; besides a metal-organic coordination bond formed between a traditional ligand and metal ions, the added flame retardant and central metal ions form a new metal-organic coordination bond, so that the crystallinity of the metal organic framework compound can be regulated and controlled, and the metal organic framework compound can be in a crystalline state or an amorphous state or a mixed state of the crystalline state and the amorphous state. When the intrinsic flame-retardant organic framework compound prepared by the method is used as a secondary battery diaphragm material, strong chemical adsorption and catalytic action on polysulfide are realized, fixation of electrolyte anions can be realized, and uniform distribution and migration of electrolyte cations are promoted, so that the rate capability and the cycling stability of a battery are improved.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to an In2Ox-modified lithium-sulfur battery diaphragm with an olivary structure as well as a preparation method and application of the In2Ox-modified lithium-sulfur battery diaphragm. According to the lithium-sulfur battery diaphragm, a polypropylene diaphragm is used as a substrate, and the surface of the polypropylene diaphragm is coated with a composite film which is formed by stirring In2Ox with an olivary structure and Super-P conductive carbon black and is used as a modification layer; the oxygen element concentration of the middle region of the olivary structure In2Ox is lower than that of the regions at the two ends; the In2Ox material prepared by a hydrothermal-calcination process has high-concentration oxygen vacancies and a unique olivary structure, can enhance the wettability of an electrolyte, and is also beneficial to exposure of adsorption catalysis sites, inhibition of shuttling of polysulfides, improvement of the oxidation-reduction reaction efficiency and improvement of the utilization rate of sulfur. By using the modified diaphragm, the rate capability and the cycling stability of the lithium-sulfur battery are greatly improved.

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 invention relates to a method for sealing a substrate, comprising at least steps 1) and 3), by applying at least part of a solvent-based composition to a surface of the substrate to at least part form a film (1) on said surface, applying at least part of a sealant composition to the film obtained after step 1) to form a sealant film (3), wherein the sealant composition is obtainable by mixing at least two components A) and B) of a sealing system, which are present separately, with one another, the solvent-borne composition applied in step 1) comprising at least one aliphatic hydrocarbon as an organic solvent component a1) in an amount of at least 70.0 wt.-%, based on the total weight of the composition, at least one organometallate as component a2) in an amount of at least 70.0 wt.-%, based on the total weight of the composition, the present invention relates to a method for preparing a solvent-borne composition comprising at least one metal acid salt, the metal of which is selected from Ti and Zr, and at least one organosilane as component a3), sealing substrates obtainable by this method, the use of this solvent-borne composition as an adhesion promoting composition, the solvent-borne composition itself, and a kit comprising said solvent-borne composition.