14results about How to "Improve chemical performance" patented technology

The invention relates to the technical field of lithium ion batteries, and provides a lithium iron phosphate battery positive pole piece, a preparation method and a lithium ion battery. The positive pole piece of the lithium iron phosphate battery comprises a foil layer, the positive electrode coatings are coated on the front and back surfaces of the foil layer, and comprise a first positive electrode coating close to the foil layer and a second positive electrode coating far away from the foil layer; wherein the first positive electrode coating comprises a first positive electrode active material, a first conductive agent and a first binder, and the first positive electrode active material is a lithium iron phosphate material; the second positive electrode coating comprises a second positive electrode active material, a second conductive agent and a second binder, and the second positive electrode active material comprises a lithium iron phosphate material and a ternary lithium material. Through a double-layer coating technology, a ternary material with good conductivity is introduced as an outer layer, so that the conductivity of an outer layer system is improved, the resistivity of the pole piece is reduced, and the problems of large internal resistance and poor dynamic performance of a positive electrode thick coating are solved.

The present invention relates to the technical field of powder metallurgy, and more particularly to a method for preparing a graphene composite copper strip by powder metallurgy combined with a medium-temperature continuous extrusion process using copper waste. According to the application scenario of the graphene composite copper strip, copper waste containing different components is selected; the copper waste is crushed into copper block fragments; 0.1-8% of graphene by mass is added to the copper block fragments, and a first-size mixed powder is formed by grinding; the first-size mixed powder is semi-melted and stirred to form a graphene-copper mixed substrate, which is continuously extruded; the graphene composite copper strip blank is processed with reference to a conventional copper cold rolling process to obtain a graphene composite copper strip. The present invention combines a medium-temperature continuous extrusion process with a powder metallurgy process to realize the recycling of copper waste in a non-smelting manner and the production of a matrix of a high-performance graphene composite copper strip. The present invention also discloses the application of the graphene composite copper strip.

The invention relates to a method for preparing artistic concrete by taking broken glass as a main raw material, which comprises the following steps of: a) treating the broken glass: cleaning recycled waste glass, and removing non-glass impurities by adopting a mechanical screening and water washing combined method; b) burdening and mixing: mixing the crushed glass slag with cement and fine sand according to a mass ratio; c) mixing and forming: putting all the materials into a concrete mixer with a speed-adjustable function, and fully stirring until the materials are uniform; then pouring the mixed concrete slurry into a pre-designed mold; and d) curing and demolding: primarily curing the poured concrete in a mold. The recycled waste glass is reasonably treated and proportioned, so that the physical and chemical properties of the concrete are enhanced, and a concrete product is more durable and stable when being used outdoors.

The invention discloses a methyl modified hydrogel electrolyte, a preparation method thereof and application of the methyl modified hydrogel electrolyte in a zinc battery, and belongs to the field of secondary batteries. The hydrogel electrolyte is composed of acrylamide, methyl cellulose and zinc sulfate. The preparation method comprises the following steps: adding methyl cellulose and acrylamide into a zinc sulfate solution, uniformly mixing, then adding a potassium persulfate initiator and a cross-linking agent N, N '-methylene bisacrylamide, finally putting into a double-layer glass plate, sealing, and carrying out thermal polymerization. The methyl cellulose has zinc affinity and can convert an acrylamide proton polymer into an aprotic polymer to weaken intermolecular hydrogen bonds, so that free hydrogen bond receptors are released to participate in cationic solvation. The solubilization and recrystallization strategy can effectively adjust the gel electrolyte environment, cut off hydrogen bonds formed by binding water donors and participate in electrolyte salt dissolution, so that the electrolyte concentration is increased, and salting-out of the electrolyte is inhibited. When the gel electrolyte is applied to the zinc battery, zinc ion migration can be accelerated, and excellent cycle performance under a low-temperature condition is realized.

The invention relates to the technical field of preparation of composite nanowires, in particular to a nickel sulfide titanium dioxide composite nanowire as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a nickel-containing titanium-based nanowire obtained by carrying out ion exchange on a nickel element Na2Ti3O7 nanowire as a raw material; the nickel-containing titanium-based nanowire is mixed with sublimed sulfur, and then the nickel sulfide / titanium dioxide composite nanowire is prepared through a two-step heating process. The nickel sulfide / titanium dioxide composite nanowire obtained through the technical scheme is regular in morphology, and nickel sulfide and titanium dioxide are evenly distributed; adsorption of the lithium-sulfur battery positive electrode carrier to a discharge intermediate product can be effectively enhanced, conversion of the discharge intermediate product is accelerated, the electrochemical performance of the lithium-sulfur battery is improved, and meanwhile, the process for preparing the polar transition metal compound material with the high specific surface area and the high activity is simple, and production is easy.

The present invention provides a method for preparing a lithium-sulfur battery catalyst material, which is used to prepare a lithium-sulfur battery catalyst material in which atomically dispersed Ni-Co bimetallic tandem sites are coordinated with nitrogen and embedded in porous carbon, and comprises the following steps: step S1, dissolving Zn(NO3)2·6H2O, Co(NO3)2·6H2O and Ni(NO3)2·6H2O in methanol to form a mixed solution, adding 2-methylimidazole and methanol to the mixed solution, stirring and aging, and then filtering and collecting the precipitate, washing the precipitate and vacuum drying to obtain ZnCoNi-ZIF; step S2, placing ZnCoNi-ZIF in a tubular furnace and heating it to obtain a pyrolysis product, soaking the pyrolysis product, selectively removing metal particles on the surface, and vacuum drying to obtain a lithium-sulfur battery catalyst material CoNi-NC. The present invention also provides a lithium-sulfur battery catalyst material, which is prepared by the above-mentioned method for preparing the lithium-sulfur battery catalyst material. The present invention also provides the application of the above-mentioned lithium-sulfur battery catalyst material in a lithium-sulfur battery.

The present application provides an electrolyte, an electrochemical device and an electronic device, wherein the electrolyte comprises lithium bis(fluorosulfonyl)imide, a sulfur-containing compound and propyl propionate, wherein the mass percentage of lithium bis(fluorosulfonyl)imide is A%, the mass percentage of the sulfur-containing compound is B%, and the mass percentage of propyl propionate is D%, based on the mass of the electrolyte, and 0.3≤B / A≤4, 30≤D≤40. The above arrangement is conducive to reducing the risk of increased AC impedance of the electrochemical device under high voltage and improving the anti-drop performance and intermittent cycle performance of the electrochemical device.

This invention discloses a polyolefin adhesive for liquid cooling plates, a heat-bonding film, and a method for preparing the same. The polyolefin adhesive for liquid cooling plates comprises the following raw materials in parts by weight: 40-80 parts of a base resin; 5-40 parts of a tackifying resin; 1-35 parts of a flame retardant; 1-5 parts of a crosslinking agent; and 0.1-0.5 parts of an antioxidant. The base resin is maleic anhydride polyolefin resin, and the crosslinking agent includes aziridine crosslinking agent, or may also include at least one of polycarbodiimide, bisphenol A type epoxy resin, and bisphenol A type phenolic epoxy resin. This invention achieves a reduction in the curing temperature of the adhesive film and improves its performance.

The invention provides a fabricated carbon sequestration ecological fish reef based on CO2 mineralized recycled aggregate and a preparation method of the fabricated carbon sequestration ecological fish reef, and belongs to the technical field of carbon sequestration technologies and the field of marine ecological restoration. The fabricated carbon sequestration ecological fish reef based on the CO2 mineralized recycled aggregate is prepared from the following raw materials in parts by mass: 20 to 30 parts of CO2 mineralized recycled aggregate, 15 to 20 parts of sea sand, 10 to 15 parts of cement, 1 to 2 parts of mineral admixture, 2 to 4 parts of shell powder, 0.15 to 0.6 part of additive and 3 to 6 parts of water, the CO2 mineralized recycled aggregate is prepared from the following raw materials in parts by mass: 15 to 20 parts of CO2 mineralized recycled coarse aggregate and 5 to 10 parts of CO2 mineralized recycled fine aggregate. The fabricated carbon sequestration ecological fish reef based on the CO2 mineralized recycled aggregate is integrally formed through a formwork pouring process, and has the advantages of modular assembly, good stability, convenience in construction and the like. According to the method, marine ecological restoration and biological inhabitation are facilitated, carbon sequestration and emission reduction can be achieved through the CO2 mineralization technology, and high ecological and environmental protection values are achieved.

The present invention relates to the field of cable technology, and specifically to an astronaut extravehicular cable, comprising an outer sheath and a mica wrapping tape layer and an electromagnetic shielding layer arranged on the inner side of the outer sheath, wherein the electromagnetic shielding layer covers and fixes a plurality of cable cores, and the cable cores are composed of a conductor and an inner sheath; the electromagnetic shielding layer comprises a matrix resin, graphene oxide / carbon nanocomposite fibers and 3D‑MXene@M, wherein M is a transition metal element. The electromagnetic shielding layer in the present invention has good mechanical properties and excellent electromagnetic shielding effectiveness. The astronaut extravehicular cable prepared by the electromagnetic shielding layer can effectively resist electromagnetic radiation from outer space, maintain stable transmission of signals in the cable, and has broad application prospects in outer space exploration.

The application provides a pole piece, a preparation method of the pole piece, a battery, a battery pack and a power utilization device. The pole piece comprises an active layer, and the active layer comprises a dispersant with a structure shown in the following formula I: Formula I in the formula I, m is an integer selected from 50-10000, n is an integer selected from 100-10000, and the m and the n satisfy 0.5<=n / m<=3.5. The pole piece not only has the advantage of high peeling strength, but also has the advantage of uniform dispersing of the conductive agent, and therefore is beneficial to the improvement of the electrochemical performance of the battery.

The application provides a method for preparing lithium iron phosphate by liquid-phase nitrogen-doped phenolic resin and relates to the technical field of lithium ion battery cathode materials, and solves the technical problems of waste lithium source, difficulty in element doping and poor doping effect in the preparation of lithium iron phosphate by the existing liquid-phase method. The application comprises the following steps: adding a surfactant, nitrogen-doped phenolic resin and a boron source into desalted water to dissolve and mix to obtain a dopant solution; adding the surfactant, a phosphorus salt, an iron salt and a lithium salt into desalted water to dissolve and mix to obtain a precursor solution; mixing the precursor solution with the dopant solution to obtain a precursor product through high-temperature and high-pressure reaction. The application improves the doping efficiency and uniformity through liquid-phase nitrogen doping and boron doping, improves the electrochemical performance of lithium iron phosphate through the synergistic effect of nitrogen doping and boron doping, and improves the lithium ion transfer rate while improving the lithium utilization rate by adding the surfactant to form lithium iron phosphate with three-dimensional porous morphology.

This invention provides a novel dry-process electrolyte membrane, its preparation method, and its application, belonging to the field of solid-state battery technology. The electrolyte membrane is prepared by a dry film-forming process after combining a highly elastic and viscous halide with a solid electrolyte; the highly elastic and viscous halide includes Li3McXb6, derivatives of Li3McXb6, and Li... x Md y N 1‑ y Cl q and Li x Md y N 1‑y Cl q The electrolyte membrane comprises at least one of the following derivatives: Mc, In, Al, Ti, Y, Dy, Gd, Ge, Sc, Zr, and Yb; and Md comprises at least one of In, Y, Al, Zr, Sc, and Ge. This electrolyte membrane exhibits low porosity and high tensile strength, with a more compact internal structure, reducing internal defects in the battery. The increased tensile strength suppresses lithium dendrite penetration, preventing internal short circuits and thus achieving superior battery cycle performance.

The invention discloses a preparation method of a silicon dioxide uniformly coated lithium iron phosphate positive electrode material, which comprises the following steps: uniformly mixing and stirring lithium iron phosphate and polyacrylic acid (PAA) with a certain concentration to obtain carboxylated lithium iron phosphate; the preparation method comprises the following steps: mixing tetraethoxysilane (TEOS) with ammonia water, and adding 3-aminopropyltriethoxysilane (APTES) to obtain aminated silicon dioxide nanoparticles; and amino and carboxyl are coupled to generate chemical bonds, so that silicon dioxide nanoparticles are uniformly and stably combined on the surface of lithium iron phosphate. The silicon dioxide nanoparticles are uniformly and stably modified on the surface of the lithium iron phosphate by utilizing the coupling reaction of amino and carboxyl, so that the material is prevented from falling off from the surface. The conductivity of the lithium iron phosphate material modified by the method is increased, the specific capacity and the rate capability are remarkably improved, the first charge-discharge specific capacity of the lithium iron phosphate material can reach 160.3-162.7 mAh / g, and the specific capacity of the lithium iron phosphate material under 2C rate can reach 139.2-140.8 mAh / g.