44results about How to "Shorten the diffusion path" patented technology

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

This invention belongs to the technical field of lithium battery anode materials, specifically relating to a highly conductive graphite electrode material and its preparation method. The preparation method includes: pre-dissolving sodium carboxymethyl cellulose into a gel solution, then ball-milling and mixing graphite and conductive carbon black, dispersing them together with a cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and hafnium diboride nanomaterials in the gel solution, adjusting the acidity, adding styrene-butadiene rubber emulsion to obtain a uniform slurry, and then coating, drying, and compacting to obtain the anode sheet. This invention significantly improves the conductivity and structural stability of the graphite anode through the synergistic effect of the interface modification of the cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and the conductive framework of the hafnium diboride nanomaterials. The process is safe and controllable, and suitable for industrial production of lithium-ion batteries.

The present application relates to the technical field of sodium battery materials, in particular to a sodium supplement coating based on a spiral iron-carbon composite material and a preparation method thereof, a spiral polypyrrole template is synthesized by a chiral template method, Fe3C@CNS spiral carbon composite material rich in Fe3C nanocrystals and iron single-atom sites is prepared through iron loading, sulfidation and high-temperature pyrolysis, Na2C2O4@Fe3C@CNS composite material is prepared by highly dispersing sodium oxalate on the surface and in the pores of the spiral carbon composite material through a recrystallization method, finally, a slurry is prepared by mixing the Na2C2O4@Fe3C@CNS composite material with a conductive agent and a binder, and the slurry is coated on the surface of an electrode to form a functional sodium supplement coating. The sodium supplement coating based on the spiral iron-carbon composite material and the preparation method thereof solve the problems of poor interface stability and first-cycle irreversible sodium loss of existing sodium ion batteries, realize efficient sodium pre-activation and interface synergistic regulation, and improve the comprehensive performance of the battery.

The invention provides a graphene / activated carbon composite material and a preparation method and application thereof, and belongs to the technical field of nano materials, the graphene / activated carbon composite material comprises a carbon matrix and a two-dimensional sheet material covering the carbon matrix; the carbon matrix is an activated carbon material and is a carbon material prepared by performing high-temperature pyrolysis on magnesium citrate in a high-temperature self-propagating reaction process; the two-dimensional sheet material is a graphene material and is a few-layer carbon material which is prepared by converting CO2 through a high-temperature self-propagating reaction and is formed by arranging carbon atoms according to a honeycomb-shaped two-dimensional lattice. According to the invention, graphene is used as a conductive and structural dual skeleton; and a hierarchical pore structure is constructed by utilizing gas production and template effect in the reaction process, so that the electrochemical performance of the active carbon positive electrode is improved. And a proper amount of graphene can provide more active sites and maintain the structural stability at the same time, so that the specific capacity and the cycle life are remarkably improved and prolonged, and the material has a wide application prospect and is particularly suitable for preparing a high-performance lithium ion capacitor positive electrode material.

The invention provides a silane deposition silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: performing in-situ reaction on zinc salt, dimethylimidazole and a pore-forming agent to obtain a first precursor; and after carbonization treatment, alkali activation is carried out, and then vapor deposition is adopted to obtain the silane deposition silicon-carbon composite material. The prepared silane deposition silicon-carbon composite material has good stability and mechanical strength, hierarchical pore structure distribution and high-capacity ultra-long circulation. The method can solve the problems that existing vapor deposition silicon-carbon is poor in structural stability, and pores of a carbon matrix obtained through traditional ZIF-8 carbonization are prone to collapse.

The application relates to the technical field of battery materials, and discloses a sodium-philic carbon-based material, a negative-electrode-free current collector, a preparation method of the sodium-philic carbon-based material and a sodium metal battery. The preparation method of the sodium-philic carbon-based material comprises the following steps: providing a mixed solution, wherein the mixed solution comprises carbon source powder, an iron source and a solvent; fully reacting the mixed solution in a protective atmosphere at 160-240 DEG C; obtaining a carbon-loaded sodium-philic material after solid-liquid separation; fully calcining the carbon-loaded sodium-philic material in an inert atmosphere at 700-900 DEG C to obtain a porous sodium-philic precursor; and treating the porous sodium-philic precursor in a reaction gas atmosphere at 400-700 DEG C for 1-3 hours to obtain the sodium-philic carbon-based material. The reaction gas atmosphere is an ammonia gas and inert gas mixed atmosphere or an ammonia gas atmosphere. The material is coated on the surface of the negative-electrode-free sodium metal battery current collector, and can enhance the electrochemical performance of the battery.

This invention relates to a core-shell structured sodium iron phosphate pyrophosphate cathode material, its preparation method, electrode sheet, and battery, belonging to the technical field of methods or devices for directly converting chemical energy into electrical energy. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention comprises primary particles, each primary particle including: a core, a sodium iron phosphate pyrophosphate shell layer disposed on at least a portion of the surface of the core, and a carbon coating layer located within the pores and on the surface of the sodium iron phosphate pyrophosphate shell layer; the core includes a NASICON-type sodium-ion inorganic solid electrolyte with an average particle size ≤50nm; the average thickness of the sodium iron phosphate pyrophosphate shell layer is ≤500nm; the chemical formula of the sodium iron phosphate pyrophosphate shell layer is Na₄Fe₂O₃. 3‑ x M x (PO4)2P2O7, 0≤x≤0.9, M is a doped metal element. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention combines high solid density, high conductivity and good electrochemical performance.

This invention discloses a modified sodium vanadium fluorophosphate material, its preparation method, and its applications. To address the technical problems of low conductivity and poor rate performance in existing sodium vanadium fluorophosphate materials, this invention employs a sodium hexametaphosphate-assisted hydrothermal method to construct an integrated preparation system of "surfactant regulation-hydrothermal crystallization." Sodium hexametaphosphate stabilizes the system and regulates the crystal nucleation rate by coordinating polyphosphate ions with the metal ions of the sodium vanadium fluorophosphate precursor. Simultaneously, it adsorbs at the crystal growth interface, inhibiting particle agglomeration and adjusting the crystal facet growth rate ratio through steric hindrance. The particle size of sodium vanadium fluorophosphate is continuously adjustable by controlling the amount of sodium hexametaphosphate added. The beneficial effects of this invention are: it effectively improves electrode mass transfer efficiency, synergistically enhances the electrochemical performance of sodium vanadium fluorophosphate materials, establishes a simple and efficient "one-step synthesis-performance optimization" technical solution, and provides a theoretical basis and experimental reference for the preparation and application of high-performance sodium vanadium fluorophosphate materials.

The invention relates to the technical field of lithium manganese iron phosphate materials, in particular to modified lithium manganese iron phosphate, a preparation method thereof, a positive electrode material, a battery and application. The modified lithium manganese iron phosphate is prepared from the following raw materials: lithium manganese iron phosphate, C7H7ZnCl and silane; the mass ratio of the lithium manganese iron phosphate to the C7H7ZnCl to the silane is 1: (0.01 to 0.06): (0.01 to 0.08). According to the modified lithium manganese iron phosphate provided by the invention, the raw material contains the silane, and the silicon dioxide obtained by sintering the silane is used as a supporting structure of the LFMP, so that the thermal stability of the LFMP is improved.

The invention relates to the technical field of building materials and ocean engineering protection, in particular to a preparation method of a marine concrete heavy anti-corrosion coating. Comprising the following steps: 1, preparing materials and carrying out dry mixing to obtain an inorganic dry powder base material; step 2, preparing and mixing wet materials, taking polymer emulsion, a silane coupling agent and water, and uniformly mixing the polymer emulsion, the silane coupling agent and the water; in a stirring state, slowly dropwise adding the mixed solution into the inorganic dry powder base material in the step 1; step 3, dispersion and defoaming: stirring is kept in the dropwise adding process, a defoaming agent is added, high-speed dispersion is performed until the slurry is in a uniform flow state and has no obvious bubbles, and heavy-duty cement-based composite coating slurry is obtained; 4, film forming construction is conducted, specifically, a concrete base surface is coated with the slurry obtained in the step 3 through a layered coating technology, and an anti-corrosion coating is formed after standing and curing. According to the invention, the physical compactness of the coating is greatly improved, the water absorption rate of the coating is obviously reduced, and the anti-permeability pressure is improved.

The application relates to the field of secondary batteries, in particular to a kind of antimony negative material and its preparation method, lithium ion battery and terminal, organic ligand containing carboxyl and mercapto, antimony source and polyethylene glycol are mixed to obtain solution A; Sodium borohydride and selenium source are added into ethanol, and then polyethyleneimine is added to obtain solution B; Solution A and solution B are mixed to carry out solvothermal reaction; The solvothermal reaction product is collected, washed and dried, and the lithium ion battery assembled by the antimony-based negative material of the application shows excellent electrochemical performance and can be used in various terminals.

The invention relates to a structural battery based on integration of a honeycomb composite material and an electrochemical energy storage unit. According to the structural battery, a force bearing function and an electric energy storage function are combined. According to the battery, a bionic honeycomb composite material is adopted as a matrix, and a lithium ion electrochemical unit is embedded into the matrix, so that the multifunctional structure battery with high mechanical strength and excellent electrochemical performance is formed. The honeycomb composite material is used as a carrier and an ion transmission channel of an electrode active material, and is also used as a bearing structure of a mechanical load. According to the design, the energy density, the safety and the cycle life of the battery are remarkably improved, and the battery is particularly suitable for the fields of electric automobiles, aerospace and the like with relatively high requirements on light weight and space utilization rate.

The invention provides a quick-welding and high-reliability brazing film and a preparation method and a using method thereof, and belongs to the technical field of welding. According to the invention, a Ni / Al self-propagating reaction film is combined with a low-melting-point Sn weld-aid layer by relying on hot-pressing, electro-deposition and anodic oxidation composite process molding, and a multi-layer structure brazing film of a porous energetic film-Ni reaction layer-Sn anchoring layer is designed. According to the method, multi-point laser triggering and gradient pressure synergistic effect are combined, accurate regulation and control of multi-point triggering-reaction-welding can be achieved, the film is subjected to global uniform self-propagating exothermic reaction, rapid brazing connection is achieved, and an alloying connection interface with high bonding strength is formed. The process is simple, convenient and rapid, high in production efficiency and low in cost, the production period can be remarkably shortened, the problems that a traditional film interface is weak in bonding force, prone to layering and falling off and the like are effectively solved, welding faces of any shapes can be adapted, and a new technical approach is provided for efficient connection of complex components.

The invention discloses a room-temperature hydrogen sulfide (H2S) sensor based on stannic oxide (SnO2) hollow spheres and polypyrrole (PPy) nanotubes and a preparation method of the room-temperature hydrogen sulfide (H2S) sensor, and belongs to the technical field of gas sensors. A green and low-cost chemical synthesis process is adopted, SnO2 hollow spheres and PPy nanotubes are prepared, a gas sensitive material with a multi-stage micro-nano structure and a p-n heterojunction is formed through composite construction, and the surface of an interdigital electrode is coated with the gas sensitive material to prepare a sensing device. The composite material combines abundant active sites brought by high specific surface area of the SnO2 hollow spheres and excellent room temperature conductivity of the PPy nanotubes, and effectively solves the problems of high working temperature and large energy consumption of a traditional metal oxide sensor. Tests show that the sensor has the characteristics of quick response and short recovery time to H2S gas at room temperature. In addition, the preparation process is simple, raw materials are cheap and easy to obtain, and the method is suitable for large-scale production and has wide application prospects in the fields of industrial safety monitoring and environment detection.

The utility model discloses a discharge door structure for an internal mixer production line, which comprises an internal mixer discharge port, a wheel rolling machine feed port and a rack, a cabin door device is mounted in the rack, the internal mixer discharge port is arranged above the cabin door device, and the wheel rolling machine feed port is arranged below the cabin door device; the cabin door device comprises a discharging door, a driving assembly, a sliding cabin door and a crank connecting rod assembly, the discharging door is rotationally installed on the inner wall of the rack, the driving end of the driving assembly is connected with the discharging door, the sliding cabin door is located above a feeding port of the wheel rolling machine, and the crank connecting rod assembly is connected with the discharging door and the sliding cabin door. When the discharging door is closed, the crank connecting rod assembly drives the sliding cabin door to synchronously close the feeding port, synchronism and coordination of the discharging process and the feeding process are guaranteed, the problem of material leakage or blockage caused by asynchronous actions of the discharging process and the feeding process is solved, the operation stability and reliability of equipment are remarkably improved, and the problems that a feeding port of a traditional wheel rolling machine is normally open and cannot be closed are solved. And the problem that materials are polluted is solved.

The invention provides a high-dispersion high-rate polyanion sodium battery positive electrode material and a preparation method thereof, the positive electrode material comprises ferric sodium pyrophosphate and carbon, and meets one or more of the following conditions: (1) the positive electrode material exists in the form of primary single crystal particles; (2) the D50 of the positive electrode material is 0.5-2.5, and the D90 of the positive electrode material is 1-5; (3) the compaction density of the positive electrode material is 2.0-2.1 g / cm < 3 >; (4) the molecular formula of the ferric sodium pyrophosphate in the positive electrode material is Na4Fe3 (PO4) 2P2O7; and (5) the carbon content of the positive electrode material is 1.0-2.5 wt%. According to the preparation method, anhydrous iron-phosphorus compounds are adopted as precursors, and the interaction among particles is greatly weakened by virtue of weak interaction among the anhydrous iron-phosphorus compounds, synergistic particle size regulation and low-temperature sintering, so that primary small ferric sodium pyrophosphate particles which are regular in morphology and highly dispersed are prepared; and gaps caused by loose aggregation among the primary particles are eliminated, so that the prepared positive electrode material has relatively high compaction density.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries, the preparation method comprises the following steps: mixing an iron source, a lithium source, a phosphorus source, a dopant and a grinding agent, and carrying out dry ball milling to obtain precursor powder; and sintering the precursor powder under the protection of inert gas to obtain the lithium iron phosphate positive electrode material. According to the method, high-purity graphite / acetylene black is used as a grinding agent and a carbon source, a doping agent is added at the same time, a solvent does not need to be used, a ball-milled material does not need to be dried, uniform compounding of a precursor and construction of a conductive network are achieved in one step through the mechanochemical effect, and then the conductive network is obtained through high-temperature sintering. The prepared lithium iron phosphate positive electrode material has excellent electrochemical performance and relatively high compaction density, and still keeps relatively good electrochemical performance in a low-temperature environment, so that a new development direction is provided for production of lithium iron phosphate.

The present application relates to a resin-assisted gradient-doped LMFP positive electrode material, a preparation method and a positive electrode, the preparation method comprising: mixing a sulfonic acid type cation exchange resin with a mixed salt solution, loading metal ions on the sulfonic acid type cation exchange resin, washing to obtain a loaded resin; heat treating the loaded resin to uniformly disperse metal oxides, and then mixing with a phosphoric acid solution to obtain a mixed solution; the mixed solution is dried by spray drying to obtain a precursor powder; mixing a lithium source, a nitrogen-doped carbon source and the precursor powder, and wetting with a glucose solution to form a slurry mixture; after the slurry mixture is dried, sintering is performed to obtain the resin-assisted gradient-doped LMFP positive electrode material. The present application can inhibit the Jahn-Teller distortion of Mn, and improve the cycle stability and conductivity of the positive electrode material.

This invention discloses a method for preparing lithium iron phosphate using iron hydroxyl oxide as an intermediate, belonging to the field of new energy battery materials. The method includes: removing impurities from a ferrous sulfate solution, adding ammonium bicarbonate and ammonium fluoride, heating and passing an oxidizing gas to react and generate the iron hydroxyl oxide intermediate; mixing and milling this intermediate with a phosphorus source, a lithium source, and a carbon source, spray drying, and sintering under an inert atmosphere to obtain lithium iron phosphate cathode material. This invention uses iron hydroxyl oxide as the sole iron source, eliminating the need for the iron phosphate intermediate throughout the entire process. In step two, ammonium fluoride is used for in-situ doping with fluorine, and combined with the structural template effect of the nanorod-shaped iron hydroxyl oxide, uniform nanoparticles are obtained with only one milling operation, forming microporous channels. This method simplifies the production process, reduces equipment investment and energy consumption, and the resulting material exhibits high capacity, high initial efficiency, and excellent rate performance.

The invention discloses a demisting device and method for a hot continuous rolling production line, and belongs to the field of steel rolling. According to the technical scheme, the demisting device of the hot continuous rolling production line comprises a demisting box, a plurality of pumping and discharging fans are arranged in the demisting box, a suction inlet for forming mist is formed in the bottom of the demisting box in an open mode, a movable mist discharging fan is movably arranged below the suction inlet, the air pumping direction of the movable mist discharging fan is from bottom to top, and the air pumping direction of the movable mist discharging fan is from bottom to top. And the water is discharged into the demisting box. The suction inlet with the open bottom expands the mist adsorption range, the movable mist exhaust fan is matched with the bottom-up air draft direction, the mist generation source can be accurately aligned, mist diffusion is avoided, the suction and exhaust fan and the movable mist exhaust fan form an up-and-down linkage suction and exhaust structure, the flow guide effect on the mist concentration generation position is enhanced, the demisting efficiency is greatly improved, and the demisting effect is improved. And mist escape is reduced.

This invention relates to a lithium iron phosphate composite electrode material and its preparation method, belonging to the field of electrode material technology. The preparation method of this invention significantly improves the electrochemical performance of the material through a wet-mixing precursor, modified carbon nanotube composite, and double-layer carbon coating process. The modified carbon nanotubes are treated with melamine, potassium hydroxide, and boric acid to achieve nitrogen / boron co-doping and surface functionalization, constructing efficient electron transport channels and shortening the lithium-ion diffusion path through a microporous structure; their high aspect ratio and improved graphitization effectively alleviate charge-discharge volume expansion and ensure high-temperature structural stability. The double-layer carbon coating consists of a polydopamine inner layer and a glucose-derived carbon outer layer. The inner layer strengthens the interface bonding through chemical bonding and guides uniform lithium-ion diffusion, while the highly conductive outer carbon layer provides a fast electron transport channel and mechanical protection, synergistically optimizing ion / electron transport efficiency.

The application relates to the technical field of photovoltaic modules, in particular to a laminated cell, a preparation method thereof and a photovoltaic module. The laminated cell comprises a top cell unit, a bottom cell unit and a composite layer between the top cell unit and the bottom cell unit. The composite layer comprises a plurality of spaced rod bodies, the rod bodies extend along a first direction, and the rod bodies have a first doping element. The rod bodies at least have a first part and a second part which are stacked, and the doping concentration of the first part is different from that of the second part. The structure of the rod bodies which are spaced and extend along the first direction in the composite layer can form a vertical carrier transport channel in the composite layer, the diffusion path of the carriers is shortened, and thus the carrier transport rate is improved. Meanwhile, by adjusting the doping concentrations of the first part and the second part, the conduction band energy levels of the first part and the second part can be adjusted, so that the potential barrier of the carriers during transmission in the composite layer is reduced, and voltage loss is reduced.

The application discloses a kind of multi-level hole composite material and its preparation method and application.The composite material is alumina-silica-zirconia composite material, and the pore distribution of the composite material has the following characteristics: the pore volume of the pore with pore diameter of 10-50nm accounts for 55%-75% of total pore volume, and the pore volume of the pore with pore diameter of 50-200nm accounts for 5%-15% of total pore volume.The multi-level hole composite material has suitable pore distribution, and can be used as a catalyst carrier, especially suitable for use as a carrier of coal tar hydrogenation catalyst.

The invention provides a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material provided by the invention comprises micron-sized lithium manganese iron phosphate particles and nano-sized porous lithium manganese iron phosphate particles attached to the surfaces of the micron-sized lithium manganese iron phosphate particles, and the mass ratio of the micron-sized lithium manganese iron phosphate particles to the nano-sized porous lithium manganese iron phosphate particles is (3-5): 1. According to the positive electrode material provided by the invention, the nano-scale porous lithium manganese phosphate particles are attached to the surfaces of the micron-scale lithium manganese phosphate particles to form a micro-nano composite structure, and a porous structure in the nano-scale porous lithium manganese phosphate is combined, so that rich transmission channels and storage sites are provided for lithium ions, the diffusion path of the lithium ions is shortened, and the performance of the lithium ion battery is improved. The diffusion rate of lithium ions is improved, so that the lithium ion battery can be rapidly charged and discharged, and the high-power requirement in practical application is met.

The invention belongs to the technical field of preparation of positive electrode materials, and particularly relates to a high-rate sodium vanadium phosphate positive electrode material, a preparation method thereof and a battery. The method comprises the following steps: S1, dissolving ammonium metavanadate and oxalic acid in water to form a solution A; s2, performing ultrasonic dispersion on CNT in absolute ethyl alcohol to obtain a dispersion B; s3, slowly dropwise adding the dispersion B into the solution A until a stable transparent blue solution C is formed; s4, sequentially introducing sodium dihydrogen phosphate and thioacetamide into the solution C, and stirring to form viscous gel; and S5, carrying out vacuum drying on the viscous gel to obtain a precursor, then carrying out high-temperature heat treatment on the precursor under the protection of a nitrogen atmosphere, and finally putting a product subjected to high-temperature heat treatment in a liquid nitrogen atmosphere for rapid cooling to obtain the high-rate sodium vanadium phosphate positive electrode material. The material has relatively low resistance and relatively large sodium ion diffusion coefficient, so that the reversible specific capacity is highest, and the rate capability is best.

This application discloses a method for preparing and applying a positive electrode for a polymer lithium-ion battery, belonging to the field of lithium-ion battery technology. The preparation method includes: using a carbon fiber woven fabric as a receiving substrate, electrospinning a polyacrylonitrile solution to deposit polyacrylonitrile nanofibers on the surface and interfiber spaces of the carbon fiber woven fabric; pre-oxidizing the carbon fiber woven fabric with deposited polyacrylonitrile nanofibers; and subsequently performing heat treatment in a sulfur-containing atmosphere to convert the polyacrylonitrile nanofibers into sulfurized polyacrylonitrile nanofibers in situ, thereby obtaining the positive electrode. The positive electrode prepared by this application has high specific capacity, high cycle stability, and excellent structural compatibility, and is suitable for all-carbon fiber structure lithium-sulfur batteries.

This invention belongs to the field of functional adsorbent technology, specifically relating to a high-capacity coconut shell activated carbon adsorbent and its preparation method. The adsorbent comprises the following raw materials by weight: 80-90 parts coconut shell activated carbon, 5-15 parts mesoporous composite material, 1-6 parts aromatic donor, 0.3-1.2 parts sodium nitrite, and 1 part acidifier. The mesoporous composite material has both mesoporous mass transfer channels and polar trapping functions, which can improve the diffusion conditions of organic molecules and enhance the adsorption driving force for polar components such as aldehydes and ketones. The adsorbent has a high adsorption capacity and bed utilization efficiency for multi-component organic matter in petrochemical plant gas at normal temperature and pressure, and is suitable for the efficient adsorption and recovery of organic matter.

The invention discloses a coating method of an electrode material, which comprises the following steps: (1) olefin-substituted imidazole and halogenated hydrocarbon are mixed for an addition reaction to form a quaternary ammonium salt type ionic liquid monomer, and the halogenated hydrocarbon is one or a mixture of several of 3-bis (bromomethyl) benzene, 1, 3-bis (bromoethyl) benzene, 1, 2-dichloroethane and benzyl bromide; (2) thermally initiating the quaternary ammonium salt type ionic liquid monomer, and carrying out polymerization reaction to form a diazolium type polymeric ionic liquid; and (3) mixing the diazolium type polymeric ionic liquid and the electrode material, and calcining to form a carbon coating layer outside the electrode material. The coating material is prepared firstly, and during coating, the electrode material is directly mixed with the coating material, so that element doping is reduced, the capacity and the cycling stability are improved, the types of the electrode materials are not limited, and the application range is wide.

This invention discloses an ultra-high nickel single-crystal cathode material and its preparation method, belonging to the field of lithium battery technology. The preparation method includes: preparing Ni and Mn continuous gradient precursors in three reactors in series; achieving tungsten / molybdenum and zirconium / titanium dual-element gradient doping through layered spraying; completing crystallization and surface reconstruction through four-stage oxygen-controlled sintering; constructing fast ion channels through directional pore formation; and constructing a three-dimensional conductive network through CVD deposition and nitrogen doping. The resulting cathode material exhibits a gradient structure that alleviates phase transition stress, directional mesopores that improve rate capability, and a three-dimensional network that stabilizes the interface. It maintains >85% capacity retention after 1000 cycles at 4.5V, >95% capacity retention at 5C, and <0.5mL / g of gas generation at high temperatures. The particles show no cracks after cycling, combining high capacity, fast charging, long cycle life, and high safety, making it suitable for high-energy-density power batteries.