18results about How to "Inhibit shuttle" patented technology

The invention discloses a zinc-iodine battery based on a zinc bromide electrolyte, and belongs to the technical field of chemical energy batteries. The zinc-iodine battery comprises a positive electrode, a negative electrode and an electrolyte, the positive electrode is a positive electrode containing a dual catalytic system, and the electrolyte is an electrolyte containing zinc bromide; the positive electrode containing the dual catalytic system comprises a dual catalytic system material, conductive carbon and a binder; the dual catalytic system material is obtained by mixing an iodine elementary substance and a non-polar compound which contains halogen and a carbon group and has a symmetrical structure. The preparation method comprises the following steps: adding tetrabromo-p-benzoquinone and elemental iodine into an organic solvent for dissolving, and removing the organic solvent to obtain the dual catalytic system material, wherein the non-polar compound containing halogen and a carbon group and having a symmetrical structure is tetrabromo-p-benzoquinone. The two-step reaction of the zinc-iodine battery is doubly catalyzed by the TBBQ and the Br <->, the reaction kinetics is improved, and meanwhile, the TBBQ and the Br <-> can be subjected to oxidation-reduction reaction at the same potential to provide extra capacity, so that the construction of the high-rate and high-capacity zinc-iodine battery is realized.

This invention discloses a low-temperature resistant, high-power aqueous organic-bromine battery, belonging to the field of electrochemical energy storage technology. The invention uses a low-freezing-point bromine-based salt solution with added bromine solid complexing agent as the electrolyte, and a pseudocapacitive organic material as the negative electrode, which possesses ionic universality and can bind metal ions in the solution during the reaction. The positive electrode uses a carbon material as a substrate, where a bromine redox reaction occurs. Simultaneously, the complexing agent can complex bromine in solid form onto the carbon surface, ensuring good stability at both room temperature and low temperatures. The aqueous organic-bromine battery of this invention exhibits high energy density and ultra-high power density at room temperature, maintains high energy density even at low temperatures, and is inexpensive, showing promising application prospects.

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 invention discloses a preparation method of a metal-semimetal double-monatomic catalyst loaded on the basis of a carbon molecular sieve. The preparation method comprises the following steps: S1, carrying out activation pretreatment on a carbon molecular sieve carrier; s2, mixing the pretreated carbon molecular sieve powder with a copper salt and a selenium source, adding a solvent, stirring, and performing ultrasonic treatment to obtain precursor powder; and S3, putting the precursor powder obtained in the step S2 under inert atmosphere protection, and carrying out heat treatment. Through the electronic coupling and synergistic effect between copper and selenium atoms, the electronic structure of the catalyst can be precisely regulated and controlled, the efficiency of a reaction path is optimized, the interaction between copper and LiPSs is promoted, the catalytic performance of the catalyst is enhanced, in the adsorption and catalytic conversion process, the affinity of LiPSs and the catalyst is remarkably improved, the shuttle effect is inhibited, and the catalytic performance of the catalyst is improved. And the method has wide application prospect and important value in the research and practice of the lithium-sulfur battery.

The present invention belongs to the technical field of lithium-sulfur batteries, and specifically discloses a method for preparing a positive electrode sheet of a lithium-sulfur battery with a sulfur gradient distribution, wherein carbon material and sulfur powder are uniformly mixed to obtain sulfur-carbon powder; the sulfur-carbon powder is heated to obtain a sulfur-carbon composite material; the sulfur-carbon composite material is mixed with a conductive agent, a binder, and a solvent to obtain a slurry; the slurry is coated on a current collector, and a positive electrode sheet is formed after heating; the positive electrode sheet obtained in step S3 is placed in a heating device with the current collector on top and the coated slurry on the bottom for heating, so as to obtain a positive electrode sheet of a lithium-sulfur battery with a sulfur gradient distribution. The present invention constructs a lithium-sulfur positive electrode sheet with a sulfur gradient distribution only by controlling the heating method of the positive electrode sheet of the lithium-sulfur battery. The method is simple, efficient, and environmentally friendly in the processing process, and is suitable for large-scale industrial production. The present invention further discloses the application of the positive electrode sheet prepared by the above preparation method in a lithium-sulfur battery.

The application belongs to the technical field of electrochemical energy storage technology, and particularly relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte; the positive electrode comprises a positive electrode active material lithium iron phosphate; and the negative electrode comprises a negative electrode active material polyacrylonitrile sulfide. The positive electrode of the application adopts the extremely stable olivine-type LiFePO4, and has good thermal stability and is not easy to release oxygen at overcharge or high temperature; the negative electrode adopts SPAN, and the sulfur element exists in the form of a covalent bond, thereby avoiding the shuttling of soluble polysulfides in traditional lithium-sulfur batteries and the safety risks caused thereby, and the whole battery system does not use a metal lithium negative electrode, thereby fundamentally eliminating the short circuit hidden danger caused by lithium dendrite growth. In addition, through unique matching of the positive and negative electrode materials, a working voltage of about 1.2V is successfully achieved, thereby filling the market gap of high-performance 1.2V rechargeable lithium ion batteries.

The invention discloses a preparation method of a high-specific-energy battery electrolyte and application of the prepared electrolyte in a battery. The preparation method comprises the following steps: adding a main lithium salt into a non-aqueous solvent until the molar concentration of the main lithium salt is 0.8-1.6 mol / L, adding fluoroethylene carbonate which accounts for 0.5-50.0 wt% of the total mass of the electrolyte, and adding an additive; the additive comprises a cyclic sulfate compound serving as a first additive, and the cyclic sulfate compound accounts for 0.2-2.0 wt% of the total mass of the electrolyte; the unsaturated isocyanurate compound is used as a second additive and accounts for 0.1-1.0 wt% of the total mass of the electrolyte; specific structural definitions of the first additive and the second additive are shown in the specification. And the film-forming potentials Vca of the first additive, the second additive and the fluoroethylene carbonate at the negative electrode meet the following relation: Vca (first additive) < Vca (fluoroethylene carbonate) < Vca (second additive). The electrolyte can improve the high-temperature cycle life, the normal-temperature cycle life and the storage performance of the battery at the same time under a high-voltage system of the high-specific-energy battery.

The application relates to a diaphragm and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of electrochemical energy storage. The diaphragm comprises a porous substrate and a porous coating on at least one side surface of the porous substrate, and the porous coating comprises fibrous fillers; the fibrous fillers comprise a core layer and a shell layer on the surface of the core layer, the core layer comprises at least one of Mxene and an oxide thereof, MOFs and an oxide thereof, black phosphorus and an oxide thereof, and carbon; the shell layer comprises at least one of silicon dioxide and a lithiumophilic metal oxide; the mass ratio of the shell layer to the core layer of the fibrous fillers is M; the thermal conductivity of the diaphragm is lambda W / (m.K), the specific heat capacity is Cp J / (g.K), and the density is rho g / cm 3 ; the following relationships are satisfied: 0.010 <= (M*lambda) / (2Cp) <= 0.017 and 0.4 <= lambda / (rho*Cp) <= 1.0. The diaphragm can improve the safety performance, cycle life and rate performance of a battery.

The application discloses a modified diaphragm for lithium-sulfur batteries and a preparation process thereof. The modified diaphragm comprises a base diaphragm and a composite layer arranged on the surface of the base diaphragm. The composite layer is doped with nano metal oxide and cobalt nonasulfide. The application sets the composite layer on the base diaphragm. The composite layer is made of metal sulfide and metal oxide. The metal sulfide cobalt nonasulfide is arranged in an array on the surface of the base diaphragm. Since the metal sulfide has porosity and polarity, and the metal oxide has adsorption and catalytic properties, the two are combined. The physical barrier and chemical adsorption of the metal sulfide are utilized, the catalytic effect of the metal oxide is fully exerted, the mechanical stability is improved, the shuttle effect of polysulfide is effectively prevented, the prepared composite layer inhibits the shuttle effect, and the Coulomb efficiency and cycle life of the lithium-sulfur battery are improved.

Disclosed are a separator for a lithium-sulfur battery, a method for preparing the same and a lithium-sulfur battery containing the same. The separator comprises: a polymeric substrate film; and a composite layer on one surface of the polymeric substrate film, wherein the composite layer comprises a SCM molecular sieve and a conductive carbon material, wherein the SCM molecular sieve is selected from SCM-14 and SCM-15, and preferably, the SCM molecular sieve further contains cobalt. The separator in accordance with the present disclosure can effectively suppress the shuttle of polysulfides in lithium-sulfur batteries, and thereby reduce side reactions within the batteries, lower the self-discharge rate of lithium-sulfur batteries, and improve the cycling performances, rate performances, and storage life of the batteries.

The present invention discloses a porous Fe2O3-Se@NC material and a preparation method and application thereof, belonging to the technical field of alkali metal batteries. First, Fe2O3@NC co-doped with nitrogen and Fe2O3 is prepared, and then Fe2O3@NC porous carbon material co-doped with nitrogen and Fe2O3 is obtained by acid hydrolysis, and selenium is loaded in the Fe2O3@NC porous carbon material co-doped with nitrogen and Fe2O3 by a simple impregnation method. While achieving physical confinement of polyselenides, the effect of polar forces on polyselenides can also be achieved, thereby significantly improving the electrochemical performance of Na-Se batteries.

The present invention discloses a preparation method and application of an oxygen-doped cobalt phosphide / carbon nanotube (O-CoP / CNT) composite material. The catalyst is an O-CoP / CNT nanomaterial, and the steps are: adding MWCNTs to a cobalt chloride aqueous solution and mixing them evenly. A small amount of ammonia water (25-28%) is slowly dripped into the above solution, reacted in an oil bath for 7-15 hours, and freeze-dried to obtain Co 3 O 4 / CNT precursor; with NaH 2 PO 2 As a phosphorus source, the phosphorus source and the precursor are placed in a tube furnace, and Co is phosphated by a low-temperature phosphating method under a protective gas atmosphere. 3 O 4 / CNT is converted into CoP / CNT; the product is further placed in an air atmosphere and calcined at 100-400°C for 30 minutes to obtain an O-CoP / CNT catalyst. The material of the present invention generates a trace amount of cobalt metaphosphate on the surface of the material through surface doping, which enhances the adsorption of polysulfides, reduces the concentration of polysulfides in the electrolyte, inhibits the polysulfide shuttle effect, reduces the polarization of the battery, and increases the diffusion rate of lithium ions, thereby significantly improving the electrochemical performance of the lithium-sulfur battery.

The invention discloses an aqueous zinc-iodine battery electrolyte additive, an electrolyte preparation method and an aqueous zinc-iodine battery preparation method, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is used as a multifunctional electrolyte additive, and reversible four-electron conversion reaction is realized by synergistically regulating and controlling a zinc ion solvation structure and stable iodine positive ions, so that the zinc-iodine battery electrolyte additive is obtained. The energy density and the cycling stability of the water-based zinc-iodine battery are greatly improved, and dendritic crystal generation and side reaction can be inhibited. The electrolyte is composed of ZnSO and CHPTAC, and the pH value of the electrolyte is 5-6. The positive electrode of the iodine battery adopts a current collector-free structure, and a self-supporting electrode is prepared by compounding iodine and activated carbon and combining with carbon nanotube slurry. The zinc-iodine total battery constructed by the electrolyte and the iodine positive electrode has remarkable performance advantages.

This application belongs to the field of electrochemical energy storage technology, specifically relating to a lithium-ion battery and its preparation method. The lithium-ion battery includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte; the positive electrode includes lithium iron phosphate as the positive active material; the negative electrode includes sulfided polyacrylonitrile as the negative active material. The positive electrode of this invention uses olivine-type LiFePO4, which has an extremely stable structure, good thermal stability, and is not prone to releasing oxygen under overcharging or high temperatures; the negative electrode uses SPAN, where sulfur exists in a covalent bond form, avoiding the shuttle of soluble polysulfides and the resulting safety risks in traditional lithium-sulfur batteries. The entire battery system does not use a metallic lithium negative electrode, fundamentally eliminating the short-circuit hazard caused by lithium dendrite growth. Furthermore, through unique matching of positive and negative electrode materials, a working voltage of approximately 1.2V has been successfully achieved, filling the market gap for high-performance 1.2V rechargeable lithium-ion batteries.

This invention discloses an aqueous zinc-bromine static battery positive electrode sheet, its preparation method, and the aqueous static zinc-bromine battery, relating to the field of electrochemical energy storage technology. The aqueous zinc-bromine static battery positive electrode sheet includes a positive electrode current collector and a positive electrode material layer disposed on the surface of the current collector. The positive electrode material layer includes a positive electrode material, which comprises a carrier, a conductive agent, a binder, and a bromide salt. Preparation method: The carrier, conductive agent, and binder are mixed and slurried, coated onto the positive electrode current collector, and dried to form a carbon-containing positive electrode carrier. Subsequently, a bromide salt solution is loaded, and after static reaction, the product is obtained. This invention utilizes the dual effects of the physical adsorption of activated carbon and the chemical bonding of the cations of the ionic liquid bromide salt to efficiently and stably immobilize the bromine active material within the positive electrode, significantly suppressing the bromine shuttle effect. This preparation process is simple and low-cost. The assembled static zinc-bromine battery exhibits high specific capacity, excellent rate performance, and cycle stability, making it suitable for large-scale energy storage applications.

The invention discloses a battery diaphragm, a preparation method thereof and a lithium-sulfur battery containing the diaphragm. The battery diaphragm comprises a polymer matrix membrane and a composite layer distributed on the surface of one side of the polymer matrix membrane, the composite layer comprises a heteroatom-doped molecular sieve and a conductive carbon material, and heteroatoms are located in a crystal skeleton of the molecular sieve. The battery diaphragm disclosed by the invention can realize effective inhibition of shuttling of polysulfide in a lithium-sulfur battery through dual effects of physical confinement and chemical adsorption, reduces loss of active substances, and improves the cycle performance and capacity of the battery.

The present invention provides a lithium-sulfur battery positive electrode and a preparation method and application thereof. The lithium-sulfur battery positive electrode comprises a positive electrode current collector and an active material layer arranged on the surface of the positive electrode current collector. The active material layer comprises a sulfur-carbon composite positive electrode material, a conductive agent, a binder and N,N′-disalicylicylaldehyde ethylenediamine copper (II). The present invention can effectively inhibit the shuttling of polysulfides by adding N,N′-disalicylicylaldehyde ethylenediamine copper (II) to the lithium-sulfur battery positive electrode, catalytically accelerate the conversion of long-chain polysulfides into short-chain polysulfides, and accelerate the discharge process.

The method for modifying lithium iron phosphate cathode material with sulfur, phosphorus, and carbon provided by the present invention includes the following steps: S1: mixing lithium iron phosphate, sulfide, carbon source, and phosphorus source in a certain proportion to obtain a mixture; S2: preparing a mixed solvent by mixing ammonia water and anhydrous ethanol in a volume ratio of 2:1; S3: separately adding the mixture prepared in step S1 and the mixed solvent prepared in step S2 into a sand mill for mixing to prepare a mixed slurry; S4: centrifugally spray-drying the mixed slurry obtained in step S3 to obtain a spherical precursor; S5: placing the spherical precursor from step S4 into a tube furnace for sintering: after introducing an inert gas, heating to 300℃~350℃ and holding for 2h~5h for low-temperature pre-carbonization; then heating to 650℃~720℃ and holding for 5h~8h for high-temperature in-situ sintering, and then naturally cooling to room temperature with the furnace to obtain the modified lithium iron phosphate. This invention generates a three-layer gradient core-shell structure of LFP@sulfur-doped carbon@lithium sulfide, which significantly improves capacity, exhibits excellent interface stability, and has strong industrial adaptability.