117 results about "Lithium–sulfur battery" patented technology

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 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 method for synthesizing lithium sulfide based on micro-channel continuous flow and multi-stage gradient temperature control, and belongs to the technical field of lithium-sulfur batteries. The method solves the technical problems of low mass transfer efficiency, insufficient temperature control precision, poor product stability and the like in the existing lithium sulfide synthesis process. The method comprises the following steps: S1, pretreating raw materials; S2, configuring lithium hydroxide organic suspension by using the pretreated lithium hydroxide and anhydrous N-methyl pyrrolidone; S3, constructing a micro-channel reaction system and performing pretreatment; S4, mixing and reacting lithium hydroxide organic suspension and pretreated hydrogen sulfide in the micro-channel reactor; S5, performing solid-liquid separation on the liquid after the reaction in step S4; and S6, performing solvent recovery and hydrogen sulfide recycling treatment. Compared with the prior art, the application has the advantages of high temperature control precision, excellent stability, energy saving and carbon reduction, and economic and environmental benefits.

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.

This invention relates to the field of battery separator materials technology, specifically to MXene-functionalized aramid paper-based battery separators, their preparation methods, and applications. Meta-aramid paper is prepared by wet papermaking using short-cut meta-aramid fibers and precipitated fibers. MXene nanosheets are prepared by hydrofluoric acid etching. Using the meta-aramid paper as a substrate, a functional coating is constructed on the surface of the aramid paper by loading a mixture of para-aramid nanofibers and MXene through a vacuum-assisted filtration-layer-by-layer self-assembly method. The resulting functionalized separator is obtained through protonation reduction. The separator, with its three-dimensional porous protective layer constructed from para-aramid nanofibers and MXene, combines physical barrier and chemical bonding, effectively inhibiting polysulfide shuttle. Furthermore, the highly active sites of MXene can activate inert sulfur-containing substances, improving sulfur utilization. When used in assembling lithium-sulfur batteries, the separator achieves an initial discharge capacity of 1244 mAh·g at a constant current density. ‑1 The capacity retention rate is 82% after 200 cycles.

The application belongs to the technical field of lithium-sulfur batteries, and relates to a separator catalyst material and a preparation method and application thereof. The preparation method of the separator catalyst material comprises the following steps: S1. mixing MXene, a copper salt, a cobalt salt, an additive and a first solvent, and performing a hydrothermal reaction to obtain MXene@ copper-cobalt bimetallic oxide; and S2. mixing the MXene@ copper-cobalt bimetallic oxide and Na2S in a second solvent and performing a hydrothermal reaction to obtain MXene-composite copper-cobalt bimetallic sulfide. The preparation method is relatively simple, and the prepared separator catalyst material can improve the problem of poor cycle performance caused by the serious shuttle effect of a lithium-sulfur battery.

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 application discloses a preparation method of a CoSe2 modified bifunctional porous carbon cloth, and the CC@CoSe2 obtained after cleaning, annealing and selenization is used as a carrier material. First, the CC@CoSe2 / S composite sulfur-containing positive electrode material is prepared by depositing sulfur on the CC@CoSe2 porous network in a plasma chemical vapor co-deposition manner. Second, the CC@CoSe2 is used as the carrier material, and the metal lithium is deposited on the CC@CoSe2 porous network in an electrodeposition manner, so that the CC@CoSe2 / Li composite metal lithium negative electrode material is prepared. Finally, the CC@CoSe2 / S composite sulfur-containing positive electrode material and the CC@CoSe2 / Li composite metal lithium negative electrode material prepared in the foregoing are used as the positive electrode and negative electrode materials of a lithium-sulfur battery, are applied to a flexible lithium-sulfur full battery, and are used for assembling a soft package battery to test electrochemical performance. The application achieves the synergy of high sulfur loading and high sulfur utilization, and constructs the lithium-sulfur full battery with high packing density, high sulfur surface loading and high energy density.

This invention discloses a MoS2@2DMMT-loaded carbon fiber material and its application in lithium-sulfur batteries. Highly stable 2DMMs with a large specific surface area were prepared using an ultrasonic exfoliation process. These 2DMMs were then hydrothermally composited with MoS2 as a substrate material. Subsequently, a MoS2@2DMMT-loaded carbon fiber membrane was prepared using electrospinning and carbonization processes. The unique structure of MoS2 embedded in 2DMMT within the carbon fiber membrane provides structural reinforcement and catalytic enhancement. Based on the synergistic effect of MoS2, 2DMMT, and the carbon fiber framework, the safety and electrochemical performance of the battery are improved, thus solving the technical problem of structural instability when MoS2 nanomaterials are loaded into a carbon fiber interlayer. The carbon fiber interlayer material with MoS2@2DMMT nanomaterials prepared by this invention exhibits excellent battery performance and has extremely high application prospects.

The application belongs to the technical field of lithium-sulfur battery manufacturing, and particularly relates to a preparation device and a preparation method of high-purity ultrafine lithium sulfide electrolyte. The preparation device of high-purity ultrafine lithium sulfide electrolyte comprises a reaction furnace, a lithium microflow mechanism and a sulfur gasification mechanism are throughly arranged on the reaction furnace, and an ultrasonic generator is further arranged on the reaction furnace, and a tray is slidably arranged in the reaction furnace. The lithium microflow mechanism comprises a glove box and a smelting furnace which are throughly connected, a first mechanical valve is arranged at the communication part of the glove box and the smelting furnace, and a feeding pipe is further throughly arranged between the glove box and the smelting furnace. The smelting furnace is throughly connected with the reaction furnace through a microflow pipeline, and a microflow meter is arranged on the microflow pipeline. The sulfur gasification mechanism comprises a sulfur raw material bin and a tubular furnace which are throughly connected through a raw material pipeline, and the tubular furnace is throughly connected with the reaction furnace through an airflow pipeline. The application can continuously prepare lithium-sulfur electrolyte with high purity and low particle size without interruption, has the advantages of low cost and no other sulfide production, and is suitable for industrial production.

The embodiment of the application provides a three-dimensional porous boron nitride sulfur-loaded material, a positive plate and a preparation method thereof. The three-dimensional porous boron nitride sulfur-loaded material comprises: a positive current collector; and a three-dimensional porous boron nitride modified layer which is in-situ grown through a gas deposition process and is coated on the surface of the positive current collector. The technical scheme of the application can effectively solve the technical problems of the shuttle effect caused by the dissolution of polysulfides and the slow oxidation-reduction reaction kinetics in the lithium-sulfur battery in the prior art.

The embodiment of the application provides a kind of composite positive material and its preparation method, lithium-sulfur battery positive sheet and lithium-sulfur battery.The composite positive material includes porous carbon matrix, metal atom and carbon nanotube, carbon nanotube is in situ grown on the metal atom attached to the pore and surface of porous carbon matrix, and N element is introduced in the growth process of carbon nanotube.The application is in situ grown by carbon nanotube on porous carbon skeleton and then adjusts the pore structure of porous composite material, effectively inhibits the shuttle effect of polysulfide.At the same time, nitrogen doping helps to increase the chemical adsorption capacity of polysulfide, and also effectively inhibits the shuttle effect of polysulfide, thereby improving the utilization rate of sulfur and the cycle life of battery.The preparation method of nanotube composite material for inhibiting the shuttle effect of lithium polysulfide in the prior art is complex and has high cost.

This invention relates to a method for constructing a multiphysics-coupled simulation analysis model for lithium-sulfur batteries. An electrochemical model of the lithium-sulfur battery is constructed based on its electrochemical characteristics, and a transient heat generation model is constructed based on its thermal characteristics. An accelerating calorimeter (ARC) is used to perform adiabatic testing on the lithium-sulfur battery samples, and a charge-discharge apparatus (HPPC) is used to perform mixed power pulse characteristic testing on the samples. The multiphysics-coupled simulation analysis model is validated based on the test data. This model can simulate the electrochemical and thermal behavior of lithium-sulfur batteries under different operating conditions, providing optimization for the cell structure design, battery pack structure design, and assembly design of lithium-sulfur batteries, and has broad application prospects.

This invention relates to the preparation of a MoS2 / polypyrrole Schiff base-derived carbon (MoS2-SPC) interlayer material and its application in lithium-sulfur batteries. The invention aims to solve the technical challenges of poor sulfur conductivity and the electrochemical performance degradation caused by the "shuttle effect" of polysulfides in lithium-sulfur batteries. The method of this invention is as follows: First, melamine and pyrrole-2-carboxaldehyde undergo a condensation reaction under acidic conditions to form an imine network, followed by graft polymerization of pyrrole monomers to obtain a precursor; this precursor is then carbonized at high temperature to obtain a carbon skeleton (SPC) with a three-dimensional conductive network and abundant nitrogen-doped sites; finally, molybdenum disulfide (MoS2) is in-situ self-assembled and grown on the SPC surface via a hydrothermal reaction and annealed to obtain the MoS2-SPC heterocomposite material. This material possesses both high conductivity and strong catalytic activity, and can effectively suppress the shuttle effect through the synergistic effect of "physical barrier-chemical adsorption-catalytic conversion," significantly improving the cycle stability and reversible specific capacity of lithium-sulfur batteries, making it very suitable as a high-performance interlayer material for application in the field of lithium-sulfur batteries.

The application discloses a kind of sulfur-coordinated iron single-atom modified radial gradient pore nitrogen-doped carbon lithium-sulfur battery positive electrode carrier materials and preparation method and application, belong to lithium-sulfur battery positive electrode material technical field.Oxidized graphene is mixed and dispersed in water with cellulose nanofiber, to form dispersion, zinc salt and iron salt are prepared mixed metal salt solution is added to the dispersion, composite hydrogel is formed by electrostatic self-assembly and is immersed in the solution containing sulfur organic precursor, to obtain sulfur-containing composite hydrogel;After directional freezing, freeze-drying, the aerogel precursor with radial gradient pore structure is obtained;In inert atmosphere protection, with solid-state nitrogen source in isothermal zone but non-contact, program temperature carbonization treatment is carried out, and the sulfur-coordinated iron single-atom modified radial gradient pore nitrogen-doped carbon lithium-sulfur battery positive electrode carrier material is obtained.By sulfur-coordinated regulation atomic activity and radial gradient pore optimization mass transfer synergy, the sulfur utilization, rate performance and cycle life are significantly improved.

This invention belongs to the field of catalyst preparation and battery energy storage technology, and relates to a cobalt / molecular sieve catalyst. The preparation method of the cobalt / molecular sieve catalyst of this invention includes the following steps: S1: Dissolving the molecular sieve, then impregnating it in a cobalt-containing metal salt solution, sonicating, washing, and drying to obtain a precursor; S2: Grinding the precursor obtained in step S1, and calcining it at 300℃-600℃ for 2-5 hours under an inert gas atmosphere; subsequently, adding the calcined product and dopamine hydrochloride together to a citric acid buffer solution, sonicating, stirring, washing, and drying; S3: Grinding the dried product from step S2, and then using a high-temperature reduction process to confine the metallic cobalt through the pore structure of the molecular sieve, to obtain a molecular sieve-supported cobalt catalyst. This invention prepares a molecular sieve-supported cobalt catalyst and applies it to the membrane layer of a modified lithium-sulfur battery, resulting in excellent rate performance and stable cycle life for the lithium-sulfur battery.

This invention discloses a molecular sieve-modified separator, its preparation method, and its applications. The molecular sieve-modified separator comprises an SCM-14 molecular sieve / conductive carbon material composite modified layer and a polymer matrix membrane; the SCM-14 molecular sieve / conductive carbon material composite modified layer is uniformly distributed on one side surface of the polymer matrix membrane. The molecular sieve-modified separator of this invention can effectively suppress polysulfide shuttle in lithium-sulfur batteries, reduce internal side reactions, lower the self-discharge rate of lithium-sulfur batteries, and improve the rate performance and storage life of the batteries.

The invention discloses a nerve-like nitrogen-doped carbon confinement multi-component composite material for lithium-sulfur battery diaphragm modification and a preparation method, and relates to the technical field of lithium-sulfur batteries. The composite material comprises a three-dimensionally connected nerve-like nitrogen-doped carbon network and metal carbide nanoparticles confined at network nodes, the nerve-like nitrogen-doped carbon network is composed of carbon fibers and nodes which are connected with each other, the diameter of the nodes is larger than that of the carbon fibers, and the metal carbide nano-particles are wrapped by the graphitized nitrogen-doped carbon layer and embedded and combined at the nodes. The preparation method comprises the steps of precursor solution preparation, hydrothermal self-assembly, freeze drying and segmented heat treatment. According to the invention, the neural network structure is constructed and the metal carbide nanoparticles are confined in situ at the nodes, so that the physical barrier, chemical adsorption and catalytic conversion of polysulfide are realized, the shuttle effect is favorably inhibited, and the cycling stability and rate capability of the lithium-sulfur battery are improved.

The application discloses a high-specific-energy high-loading type primary lithium-sulfur battery electrolyte and a preparation method thereof. The electrolyte comprises a lithium salt, a solvent and an additive. The lithium salt is lithium bisfluorosulfonylimide, and the additive is lithium difluoro(oxalato)borate. The preparation method comprises the following steps: in a glove box filled with inert gas, the lithium salt is added into the solvent, the additive lithium difluoro(oxalato)borate is added after uniform stirring, and the lithium-sulfur battery electrolyte is obtained after uniform mixing. The electrolyte improves the lithium ion diffusion rate and the discharge performance of the electrolyte through the synergistic effect of the lithium salt lithium bisfluorosulfonylimide and the additive lithium difluoro(oxalato)borate, so that the voltage platform of the battery discharge is higher, and the rate performance of the battery is improved.

The disclosure provides a composite polymer electrolyte for energy storage frequency modulation lithium-sulfur batteries and a preparation method and application thereof. The preparation method comprises the following steps: stirring and treating mercapto-terminated polyoxypropylene ether, 3,4-epoxy tetrahydrothiophene and a mixed solvent, adding electrolyte salt and stirring and treating, carrying out ring-opening reaction of mercapto and epoxy to form a first prepolymer liquid; stirring and treating the first prepolymer liquid with dithiodipropionamide and azobisisobutyronitrile, carrying out addition reaction of dithiodipropionamide and linear polymer terminal mercapto after temperature rising, simultaneously carrying out coordination of electrolyte salt and residual sulfur heterocycle of 3,4-epoxy tetrahydrothiophene, forming a preliminary crosslinking system containing a dynamic disulfide bond, cooling to room temperature after reaction to obtain a second prepolymer liquid; adding a photoinitiator and a thermal initiator into the second prepolymer liquid, forming a three-dimensional crosslinking structure with dynamic and rigid properties, cooling to room temperature to obtain a gel-like membrane body; and drying the gel-like membrane body to obtain a sulfur-containing composite polymer electrolyte membrane.

This invention discloses a method for preparing a nitrogen-doped reduced graphene oxide / cellulose asymmetric modified separator for lithium-sulfur batteries. The modified separator is made by coating nitrogen-doped reduced graphene oxide and cellulose onto both sides of the separator. This invention utilizes nitrogen-doped reduced graphene oxide to adsorb and catalyze the conversion of lithium polysulfides on the positive electrode side, and utilizes cellulose to uniformly deposit metallic lithium and suppress dendrite growth on the negative electrode side, while simultaneously optimizing the redox reactions at both the positive and negative electrodes. Lithium-sulfur batteries assembled based on the asymmetric modified separator of this invention exhibit excellent cycle stability, high discharge specific capacity, and good rate performance.

This invention provides Mg4C 60 Applications of Mg4C as a catalyst in lithium-sulfur batteries, and lithium-sulfur batteries containing this catalyst and their assembly methods. 60 When used as a catalyst in lithium-sulfur batteries, it can significantly reduce the activation energy of S-S bond breaking in polysulfides, accelerate the liquid-solid reduction reaction of Li2S4→Li2S, and shorten the residence time of Li2S4 in the electrolyte. On the other hand, it can promote the direct conversion reaction of Li2S6→Li2S, avoid the formation pathway of Li2S4, thereby reducing the accumulation of highly soluble and easily shuttled Li2S4 intermediates in the system, suppressing the shuttle effect, and improving the performance of lithium-sulfur batteries.

Lithium-magnesium alloy anode and fluorinated ether electrolyte for lithium-sulfur batteries. The lithium-magnesium alloy anode contains about 90 wt% lithium and 10 wt% magnesium. The lithium-magnesium alloy anode includes at least one anode protective coating. The electrolyte contains about 0.4 M LiTFSi and about 2 wt% LiNO3 in a fluorinated ether solvent.

The application discloses a kind of battery health estimation method and system of lithium-sulfur battery, it is related to battery management technical field, the early degradation signal of lithium-sulfur battery in the cycle aging process can be comprehensively captured from electricity, mechanics and relaxation dynamics three angles, the sensitivity and reliability of health recession early warning are significantly improved;Adopt the judgment mechanism that difference value and continuous three effective determination cycle same sign test of adjacent cycle are combined, effectively eliminate battery individual difference, temperature drift and sensor zero drift etc. Common mode interference, simultaneously through three to two voting mechanism, the false alarm risk caused by single parameter fluctuation is greatly reduced.

This application provides a Zn with surface defects. x Mn 1‑x This paper discusses the infinite solid solution of Zn, its preparation method, and its application in Li-S batteries, belonging to the field of lithium-sulfur battery technology. x Mn 1‑x S-type infinite solid solution uses zinc, manganese, and organic sulfur sources as raw materials. The Zn content can be adjusted by regulating the ratio x of the zinc and manganese sources. x Mn 1‑x The band structure of an infinite solid solution balances redox properties and conductivity to improve the performance of lithium-sulfur batteries. Glycerol, ammonia, and organic sulfur sources restrict the mass transfer of metal cations and sulfur ions, playing a role in sulfide nucleation and growth. This allows for the formation of an infinite solid solution and results in more surface defects within the sulfide crystals, which promotes electron migration and ion adsorption, further enhancing lithium-sulfur battery performance.

The application discloses a layered MXene composite bimetallic sulfide-based heterostructure material and a preparation method and application thereof in modification of lithium-sulfur battery separators, and relates to the technical field of new energy storage materials. The preparation method comprises the following steps: etching V2AlC-MAX phase precursor material by using a hydrofluoric acid and hydrochloric acid solution system to obtain V2CT x -MXene colloidal suspension; adding two kinds of metal salts and a sulfur source corresponding to CuCo2S4 bimetallic sulfide into the V2CT x -MXene colloidal suspension; adding a morphology control agent into the V2CT x -MXene colloidal suspension, performing magnetic stirring and ultrasonic treatment, and then performing hydrothermal reaction to synthesize V2CT x and a heterostructure of CuCo2S4 bimetallic sulfide, namely a layered MXene composite bimetallic sulfide-based heterostructure material. The application utilizes the existence of CuCo2S4 to reduce the high surface activity of vanadium elements of V2CT x , inhibit the stacking phenomenon of MXene layers, and finally form a stable layered structure.

The present invention relates to a negative electrode and a battery comprising same. Specifically, the present invention relates to a negative electrode for a lithium-sulfur battery, the negative electrode comprising a negative electrode current collector, a first coating layer disposed on the negative electrode current collector, and a second coating layer disposed on the first coating layer, wherein: the first coating layer comprises a first metal and a first carbon-based material; the second coating layer comprises a second metal and a second carbon-based material; each of the first and second metals is a lithiophilic metal capable of alloying with lithium; a mass ratio of the first metal and the first carbon-based material is 1:10 to 1:2.5; and a mass ratio of the second metal to the second carbon-based material is 1:2 to 1:1.

An electrolyte for a lithium-sulfur battery according to the present disclosure includes an organic solvent; a lithium salt; and an additive, wherein the additive includes tantalum pentafluoride (TaF5). The electrolyte for the lithium-sulfur battery including tantalum pentafluoride improves life characteristics of the lithium-sulfur battery.

The present application relates to the technical field of lithium-sulfur batteries, in particular to a kind of porous carbon and its preparation method and application in lithium-sulfur battery.The porous carbon has micropore, mesopore and macropore, and presents continuous intercommunication honeycomb structure, and there is connecting window between pore wall, the pore volume ratio of the pore with pore diameter <5nm is 50%~75%, the pore volume ratio of the pore with pore diameter of 5~55nm is 10%~30%, and the pore volume ratio of the pore with pore diameter >55nm is 10%~30%.The porous carbon obtained by using sodium polyacrylate and sucrose as carbon source and soft template, potassium chloride as hard template, through liquid phase mixing, vacuum freeze drying, high-temperature carbonization and then using alkali etching, has three-dimensional intercommunication multi-level pore structure, and pore size distribution is reasonable, can effectively solve the problems of limited sulfur loading in existing lithium-sulfur battery positive material, structure collapse caused by volume expansion and cycle life attenuation caused by polysulfide shuttle effect, and improve the electrochemical performance of lithium-sulfur battery.