380 results about "Polysulfide" patented technology

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 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 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.

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.

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.

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 invention relates to a composite diaphragm, a preparation method thereof and a lithium-sulfur battery, and the composite diaphragm comprises a base membrane and a functional coating arranged on at least one surface of the base membrane in the thickness direction; the functional coating comprises a carbon nanotube composite material, the carbon nanotube composite material comprises a carbon nanotube and metal nanoparticles encapsulated at one end of the carbon nanotube, and the other end of the carbon nanotube is of an opening structure; the mass ratio of the metal nanoparticles in the carbon nanotube composite material is 15%-25%. Therefore, the shuttle effect of polysulfide can be effectively inhibited, the utilization rate of the positive electrode material is improved, and the redox reaction kinetics of the battery is improved, so that the first coulombic efficiency, the discharge capacity and the rate capability of the battery can be remarkably improved. In addition, the functional coating can also improve the wettability of the electrolyte on the composite diaphragm, promote the transmission of lithium ions and improve the puncture resistance of the composite diaphragm, so that the internal resistance of the battery can be reduced, and the safety of the battery can be improved.

The invention discloses a preparation method of a difunctional electrode, the electrode and application, and the preparation method comprises the following steps: (1) preparing an electroplating solution: taking deionized water as a solvent, sequentially adding nickel sulfate, ammonium sulfate, ammonium chloride and sodium thiosulfate, uniformly stirring, and adjusting the pH value to 4.5-5.5; (2) electrode pretreatment: taking a nickel wire mesh subjected to double-sided sand blasting as a cathode, and then sequentially removing oil and an oxide layer; and (3) electrochemical deposition: putting the pretreated cathode and the nickel-based stretching net anode into an electroplating solution, respectively connecting the cathode and the anode with the cathode and the anode of a power supply, and performing constant-current deposition at room temperature at the current density of 5-20mA / cm < 2 > for 30-90 minutes to obtain the difunctional electrode. The NiS alloy is prepared by optimizing an electroplating co-deposition process, the unification of high electrochemical activity and anti-iron adsorption performance is realized by utilizing a dual anti-iron mechanism of a polysulfide protective layer, the energy consumption of an electrolytic bath is reduced, and the service life is prolonged.

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.

An EPDM roofing membrane with improved hail resistance formed from a block of EPDM material with short aramid fibers added to the block of EPDM material at a concentration of 5 to 35 PHR, a weak alkaline accelerator added to the block of EPDM material at a concentration of 2 to 8 PHR, a thermoplastic elastomer added to the block of EPDM material at a concentration of 2 to 10 PHR, polysulfide silane added to the block of EPDM material at a concentration of 2 to 10 PHR; and a hemiaminal ether crosslinking agent added to the block of EPDM material at a concentration of 2 to 10 PHR.

Disclosed herein are compositions comprising a first component comprising a polyisocyanate; a second component comprising a polyol; an accelerator; a blowing agent; and a diluent, wherein the polyisocyanate and / or the polyol comprises a polysulfide linkage. Also disclosed are foams formed from the compositions disclosed herein and methods of forming the foams from the compositions disclosed herein.

This invention discloses a modified separator for lithium-sulfur batteries, its preparation method, and its application. The modified separator comprises a base film and a modified layer disposed on one side of the base film. The modified layer comprises a dual rare-earth metal selenide-boron-nitrogen co-doped functionalized carbon nanotube hybrid material. The preparation method is as follows: S1, functionalized carbon nanotubes, a boron source, a nitrogen source, and a solvent are mixed, and then ultrasonically dispersed and stirred until the boron and nitrogen sources are completely dissolved to obtain a carbon nanotube solution; a selenium source, a reducing agent, and a nucleating agent are mixed to obtain a mixed solution; S2, the carbon nanotube solution is mixed with the mixed solution, cerium salt, and lanthanum salt, and a solvothermal reaction is performed. The solid is then separated to obtain the hybrid material. This invention, by modifying the separator towards the sulfur cathode with a specific hybrid material, provides a large number of adsorption sites and effectively anchors and catalyzes the conversion of lithium polysulfides, effectively improving the deposition kinetics of Li2S and increasing sulfur utilization, thereby enhancing the long-cycle stability of lithium-sulfur batteries.

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.

The invention provides a flow battery containing a thiosulfate and potassium sulfide mixed electrolyte, a negative electrode electrolyte is a mixed solution formed by dissolving thiosulfate and potassium sulfide in a supporting electrolyte solution, the concentration of thiosulfate ions (S2O3 < 2->) is 0.1-2 mol / L, and the molar ratio of potassium sulfide (K2S) to potassium thiosulfate (K2S2O3) ranges from 1: 0.2 to 1: 2; and the supporting electrolyte is an alkaline or neutral electrolyte solution with the concentration of 1-3 mol / L. By introducing thiosulfate radical (S2O3 < 2->), the thiosulfate radical and elemental sulfur form a soluble polythiosulfate complex in a negative electrode electrolyte, solid sulfur deposition is effectively inhibited, and the problems of electrode pore blockage, flow channel blockage, active substance loss and the like caused by solid sulfur deposition in an existing polysulfide or sulfide system flow battery are solved.

The invention relates to the technical field of chemical preparation, and discloses a process for preparing lithium sulfide through hydrogenation of dimethyl disulfide or di-tert-butyl polysulfide, which comprises the following steps: preparation of hydrogen sulfide: in a first reactor, carrying out hydrogenation reaction on an organic sulfur source and hydrogen in the presence of a hydrogenation catalyst to generate hydrogen sulfide mixed gas; the organic sulfur source is dimethyl disulfide or di-tert-butyl polysulfide; synthesis of lithium sulfide: introducing the hydrogen sulfide mixed gas into a second reactor filled with lithium source slurry for reaction to generate lithium sulfide; the lithium source slurry comprises a lithium source and a cosolvent; the lithium source is lithium hydroxide or lithium carbonate. A two-step process of hydrogen sulfide preparation and lithium sulfide synthesis separation is adopted, hydrogen sulfide is prepared by hydrogenation of an organic sulfur source in the first reactor and then conveyed to the second reactor to participate in synthesis, high-purity lithium sulfide is obtained through the scheme, and the content of polysulfide is extremely low.

This invention belongs to the field of lithium-sulfur battery technology, providing a zirconium-based flexible carbon nanofiber membrane, its preparation method, a lithium-sulfur battery cathode, and a lithium-sulfur battery. The preparation method involves mixing a zirconium source, a polymer, and an organic solvent to form a spinning solution; the spinning solution is electrospun to obtain a fiber membrane; the fiber membrane is then carbonized to obtain the zirconium-based flexible carbon nanofiber membrane. This invention yields a zirconium-based flexible carbon nanofiber membrane with high conductivity, a well-structured microstructure, and active sites for zirconium-based compound nanoparticles. The zirconium-based flexible carbon nanofiber membrane with its well-structured microstructure and active sites for zirconium-based compound nanoparticles exhibits excellent chemical / physical adsorption characteristics for polysulfides. Simultaneously, the zirconium-based compound nanoparticles possess excellent electrocatalytic properties, accelerating efficient conversion between polysulfides, achieving efficient electron transfer and ion diffusion, and realizing high sulfur utilization. This results in excellent areal capacity electrochemical performance. When used as a cathode in lithium-sulfur batteries, it enables the lithium-sulfur battery to exhibit outstanding rate performance and cycle stability, promoting the development of lithium-sulfur batteries towards low-altitude economic applications. Furthermore, the zirconium-based flexible carbon nanofiber membrane, when combined with a high-sulfur-loaded sulfur cathode (greater than 6 mg / cm³), further enhances the effectiveness of the process. 2 Together, they constructed a novel "sandwich" sulfur cathode, resulting in a high-capacity lithium-sulfur battery.

The invention relates to an electron withdrawing group terminated polyimide covalent organic framework material as well as a preparation method and application thereof. According to the invention, 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride and a tetra (4-aminophenyl) methane monomer are utilized to prepare a polyamic acid covalent organic framework, and 4-cyanophenyl, 4-aminotrifluorotoluene, 4-nitroaniline and 4-chloroaniline are utilized to perform end capping, so that the electron withdrawing group-terminated polyimide covalent organic framework material is prepared. The rich pore structure of the COF skeleton provides a rapid ion transport channel, the transport of current carriers is promoted, and the electron cloud density of the COF skeleton is adjusted through Lewis acidity formed by an end-capping electron withdrawing group through an induction effect, so that an electron-deficient domain is constructed. When being used in a lithium metal battery system, the material can guide uniform distribution of lithium ions and solve the problem of lithium dendrite growth; when the material is loaded on a lithium-sulfur battery positive electrode material, polysulfide can be pulled to move directionally to complete order reduction conversion reaction, so that the lithium-sulfur battery with long cycle life is obtained.

The application discloses a gel-state battery diaphragm and a preparation method thereof and a lithium-sulfur battery, wherein the gel-state battery diaphragm comprises a base film and a gel layer, the gel layer is coated on the base film, and the material of the gel layer is a polyethylene oxide-urea gel. The method for preparing the gel-state battery diaphragm comprises the following steps: mixing and stirring a polyethylene oxide solution and a urea solution, carrying out a bonding reaction, preparing a polyethylene oxide-urea solution, coating the polyethylene oxide-urea solution on a base film, drying, and forming a gel layer; and preparing the gel-state battery diaphragm. According to the application, the hydroxyl groups in the polyethylene oxide and the amino groups in the urea are bonded to each other in the gel layer to form a hydrogen bond complex, the hydrogen bond makes the structure of the gel layer more stable, thereby inhibiting the "shuttle effect" of polysulfides in the lithium-sulfur battery, the cycle stability of the battery is improved, and the complex is swollen in the electrolyte to form a gel-state battery diaphragm, thereby improving the liquid absorption rate and the liquid retention rate of the battery diaphragm.

The invention belongs to the technical field of materials and electrochemistry, and particularly relates to a preparation method based on a nonmetal monatomic catalyst, which comprises the following steps: S1, preparing an electrostatic spinning precursor solution by adopting a solvent method; and S2, preparing a conductive carbon nanofiber skeleton by adopting an electrostatic spinning process: carrying out electrostatic spinning on the electrospinning precursor solution in the step S1 at normal temperature, and carrying out pre-oxidation and high-temperature carbonization to obtain the carbon nanofiber loaded non-metal iodine monatomic. The carbon nanofibers in the material have excellent conductivity and a continuous three-dimensional network structure, and an efficient channel is provided for uniform loading of sulfur and rapid conduction of electrons. And meanwhile, the rich pore structure can effectively accommodate molten and infiltrated sulfur, and the diffusion of polysulfide in the electrolyte is inhibited by utilizing a physical confinement effect, so that the shuttle effect is relieved fundamentally, and the integrity in long-cycle operation is ensured. The iodine monatomic active sites enhance the chemical adsorption capacity to polysulfide, so that the capacity fading caused by migration of the iodine monatomic active sites is avoided.

The present invention relates to a sulfur electrode composition for a lithium-sulfur battery, comprising: a cellulose nanofiber binder; and an active material comprising sulfur. Thereby, the sulfur electrode for a lithium-sulfur battery of the present invention maximizes the utilization rate and conversion reaction rate of sulfur in a lithium-sulfur battery even under minimal electrolyte conditions by introducing cellulose nanofibers as a binder, and the distance between the expanded glucose chains formed due to the one-dimensional structure and electrostatic repulsion of the cellulose nanofibers promotes the interaction between the binder and lithium polysulfide (LiPS), and effectively suppresses the formation of aggregates of lithium polysulfide (LiPS). Therefore, a lithium-sulfur battery including such a sulfur electrode maintains a high active material ratio even under minimal electrolyte conditions while increasing the electrochemical conversion reaction rate, thereby improving battery performance and significantly increasing energy density.

The invention relates to the field of lubricating oil, in particular to a nonferrous metal-friendly gear oil composition as well as a preparation method and application thereof. The gear oil composition comprises the following components in parts by weight: 100 parts of wind power gear oil and 0.5-2 parts of ammonium phosphate, wherein the wind power gear oil contains alkyl polysulfide with medium and low activity, and the content of trivalent sulfur of the alkyl polysulfide is 50-100%. The wind power gear oil composition provided by the invention is excellent in performance, the compatibility of an oil product and a sliding bearing, especially a copper part, can be improved to a greater extent, and the metal corrosion with a fan gear box is reduced; the wind power gear oil composition provided by the invention has the advantages of simple components, easily available raw materials, simple preparation method and wide large-scale application prospect, and can meet the requirements of customers on extreme pressure wear resistance of wind power gear oil.

The invention relates to a preparation method of NaLnS2 transparent ceramic powder with high infrared light transmittance, which comprises the following steps: by taking rare earth polysulfide LnS2 powder as a raw material and sodium fluoride or sodium sulfide as an additive, mixing the raw material and the additive to prepare a precursor of the NaLnS2 ceramic powder, putting the prepared precursor powder into an improved ball milling tank, and carrying out ball milling to obtain the NaLnS2 transparent ceramic powder with high infrared light transmittance. And carrying out mechanochemical reaction in a protective gas environment, and after ball milling is finished, separating out powder to obtain the NaLnS2 transparent ceramic powder. The problem that the NaLnS2 transparent ceramic powder is easy to oxidize due to high-temperature vulcanization is solved, and the prepared NaLnS2 transparent ceramic powder is low in oxygen content and small in particle size.

The application discloses a high-ionic-conductivity diaphragm and a preparation method thereof. The diaphragm is prepared by using an ultrahigh molecular weight polyethylene as a matrix and a covalent organic framework material as a functional filler through a thermal phase separation method. The introduction of the COF material significantly improves the ionic conductivity, thermal dimensional stability and mechanical strength of the diaphragm, and the diaphragm can be endowed with the characteristics of adsorbing polysulfides and guiding uniform ion deposition through COF channel functionalization. The preparation method is mature in process and easy to scale up production, and the prepared diaphragm is suitable for next-generation high-energy-density and high-safety electrochemical energy storage devices with high performance requirements.

The invention belongs to the field of solid electrolyte energy storage devices, and particularly relates to a CrMnCoNiZn high-entropy flame-retardant nanofiber-based solid electrolyte film and a preparation method thereof. According to the invention, PAN nanofibers are used as a matrix, a three-dimensional porous skeleton is constructed through electrostatic spinning, and a high-entropy ZIF structure composed of five metals of Cr, Mn, Co, Ni and Zn grows in situ on the surface of the three-dimensional porous skeleton, so that a composite electrolyte carrier with high stability and flame retardance is formed. And then preparing an in-situ polymerization precursor solution composed of HFBA, TEP, LiODFB and AIBN, and assembling the in-situ polymerization precursor solution, the SPAN positive electrode and the lithium negative electrode into the button cell. And inducing the system to generate in-situ polymerization under sealed aging and heating conditions to finally obtain the CrMnCoNiZn high-entropy flame-retardant nanofiber-based solid electrolyte film. The method has the advantages of stable structure, low interface impedance, prevention of polysulfide dissolution, inhibition of dendritic crystal growth and the like, and the performance and safety of the solid-state lithium-sulfur battery are remarkably improved.

This invention discloses a method for preparing and applying a ternary composite sulfur cathode material for lithium / sodium-sulfur batteries. It belongs to the field of materials preparation and application, specifically relating to a method for preparing and applying a ternary composite sulfur cathode material for lithium / sodium-sulfur batteries. The purpose of this invention is to solve the defects of existing sulfur cathodes, such as poor conductivity, polysulfide dissolution and shuttle during charge and discharge, and high volume deformation of the electrode. These defects make the surface active material of the sulfur cathode in lithium-sulfur batteries and room-temperature sodium-sulfur batteries prone to pulverization and the overall electrode structure prone to collapse, resulting in poor battery capacity and cycle stability, which seriously affects the application of lithium-sulfur batteries and room-temperature sodium-sulfur batteries. The preparation method includes: 1. Preparing a silicon sphere close-packed material; 2. Preparing a honeycomb carbon mesh material; 3. Preparing a vanadium-nitrogen co-doped titanium dioxide / honeycomb carbon mesh / carbon nanotube ternary composite material; 4. Preparing a high-performance sulfur cathode composite material. This material is used as a cathode material for lithium-sulfur batteries or sodium-sulfur batteries.

The application provides a polysulfide carbonate, a preparation method thereof and a photocurable composition, and belongs to the technical field of optical resins.The polysulfide carbonate provided by the application has a structure shown in formula I.The polysulfide carbonate provided by the application has high molar refractivity and low molar volume by introducing an aromatic group and a sulfur atom, so that the refractivity of the polysulfide carbonate is improved.The results of examples show that the refractivity of the polysulfide carbonate provided by the application reaches 1.7 or more.

This application discloses an in-situ polymerized amide-based polymer with polysulfide anionic terminal groups, its preparation method, and its application. Using DMAA as the monomer and NaOTF as the sodium salt source, anionic polymerization is carried out under the initiation of polysulfide anions to obtain PDMAA oligomers with terminal polysulfide anionic groups. After battery assembly, in-situ polymerization is used to construct a continuous organic sulfur amorphous phase and a flexible polymer network in the electrode and separator regions, achieving the fixation of polysulfide terminal groups and NaOTF. + The electrolyte primarily utilizes single-ion conduction; a sulfur-containing SEI protective layer is formed on the sodium metal surface to inhibit dendrite growth and reduce interfacial impedance. After 500 cycles at 0.2 C rate, the coulombic efficiency of the full cell is greater than 99.9%. The ion conduction efficiency and interfacial stability of the solid electrolyte are synergistically improved through the design of polysulfide anion end groups and in-situ polymerization strategy. The process is simple and low-cost, making it suitable for the large-scale application of high-safety, long-life solid sodium metal batteries.