9results about How to "Inhibit shuttle" patented technology

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 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 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.

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.