19 results about "Iron fluoride" patented technology

The invention discloses an iron fluoride / iron cyanamide and carbon coating layer composite electrode material and a preparation method thereof, and the method comprises the steps: 1, firstly adding ammonium fluoride into deionized water, fully and uniformly dissolving to obtain a solution A, and then adding hydrazine hydrate into the solution A to obtain a solution B; 2, adding FeNCN into the solution B, adding ammonia water to adjust the pH value to 6-10, stirring, carrying out suction filtration, and separating out a precipitate to obtain a sample F-FeNCN-1; 3, the sample F-FeNCN-1 is put into a tubular furnace, argon is introduced into the tubular furnace, the temperature is raised to 320-380 DEG C from the room temperature at the temperature raising rate of 10-15 DEG C / min, heat preservation is conducted for 30 min, and a sample F-FeNCN-2 is obtained; and 4, grinding a sample F-FeNCN-2, continuously putting the ground sample F-FeNCN-2 into the tubular furnace, introducing argon into the tubular furnace, heating from room temperature to 450-500 DEG C at a heating rate of 10-15 DEG C / min, and preserving heat for 30 minutes to obtain the ferric fluoride / iron cyanamide and carbon coated composite electrode material which has the advantages of high conductivity, stable interface, small volume expansion, high capacity and long cycle life.

The invention discloses porous ferric fluoride, a preparation method and application of the porous ferric fluoride in a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: stirring Lewis alkali and iron-containing Lewis acid under a heating condition to form a clear solution, adding a carbon source into the clear solution, and stirring to form uniform slurry; adding ammonium bifluoride, continuously stirring, alternately washing the obtained precipitate with ethanol and acetone, centrifuging until the supernatant is colorless and transparent, and drying to obtain a precursor; and finally, uniformly grinding the precursor, performing heat treatment, naturally cooling to room temperature, and fully grinding to obtain the porous ferric fluoride. The preparation process is simple and safe, the cost is low, the use of dangerous chemicals hydrofluoric acid and nitrogen fluoride is avoided, and large-scale synthesis can be realized; the prepared ferric fluoride has a porous morphology, is beneficial to electrolyte infiltration, ensures that the electrical contact between active particles is not influenced while the active material is in full contact with the electrolyte, and improves the electrochemical performance.

The utility model discloses a winding displacement jig for a superfine Teflon electronic wire harness, and relates to the technical field of electronic wire harness welding, the winding displacement jig comprises a bottom plate, one end of the upper end face of the bottom plate is fixedly connected with a plurality of groups of welding machines, the other end of the upper end face of the bottom plate is provided with a plurality of groups of sliding chutes, and sliding blocks are clamped in the sliding chutes in a sliding manner; a bearing table is fixedly connected to the upper ends of the multiple sets of sliding blocks, multiple sets of impurity grooves are formed in the upper end face of the bearing table, a fixed wire harness base is arranged at one end of each impurity groove, a movable wire harness base is arranged at the other end of each impurity groove, and clamping mechanisms are arranged at the upper ends of the fixed wire harness bases and the upper ends of the movable wire harness bases. And the position of the moving wire harness can be adjusted, so that adjustment is carried out according to the length of the Teflon wire harness required by welding, wire harnesses of different specifications and lengths can be clamped and welded, and the operation flexibility is improved.

The invention discloses a local high-concentration electrolyte containing a phosphorus-based additive, a preparation method and application of the local high-concentration electrolyte and a lithium metal battery, and belongs to the technical field of high-specific-energy secondary batteries. The electrolyte contains a lithium salt, an ether solvent, a fluoroether diluent and a certain amount of lithium difluoro bis (oxalate) phosphate. The electrolyte provided by the invention has higher oxidation stability under high voltage, and has good compatibility with an iron fluoride positive electrode and a lithium metal negative electrode. The lithium difluoro oxalate phosphate additive is introduced to regulate and control the solvation structure of the local high-concentration electrolyte, an F / P inorganic component-rich electrode-electrolyte interface is formed, and after the assembled FeF3 / Li battery circulates for 400 circles at the rate of 1C, the specific discharge capacity reaches up to 371 mAh g <-1 >, and the capacity retention ratio is 82%.

The invention provides a positive electrode material, a preparation method thereof and a secondary battery. The positive electrode material comprises nickel fluoride, ferric fluoride and cobalt fluoride, the molar ratio of the nickel fluoride to the ferric fluoride to the cobalt fluoride is (0.3-0.5): (0.2-0.4): (0.2-0.4), and the positive electrode material is a eutectic material. The positive electrode material disclosed by the invention is beneficial to improving the cycle performance and stability of the secondary battery.

The application discloses a material for efficiently removing heavy metal pollutants based on fluorinated zero-valent iron and a preparation method thereof, and belongs to the field of environmental functional materials. 0 The material comprises a core layer of zero-valent iron (Fe 0 ) with a particle size of 50-100 nm, and a shell layer of a composite layer of fluorinated iron (FeF3) and fluorine-doped hydroxyl iron oxide (FeOOH-F) with a thickness of 5-20 nm. The heterojunction shell layer formed by the fluorinated iron (FeF2 / FeF3) and the fluorine-doped hydroxyl iron oxide (FeOOH-F) significantly improves the surface active sites and promotes electron transfer, thereby realizing efficient reduction / adsorption of heavy metals (such as Cr(VI), Pb(II), As(III), etc.); the wide pH adaptability (pH 3-9, optimal pH 5-7) overcomes the defects that traditional zero-valent iron is prone to passivation under acidic or alkaline conditions.

The invention relates to a preparation and synthesis method of a halide electrolyte coated stable ferric fluoride positive electrode material. The preparation method mainly comprises the following steps: (1) sequentially dissolving lithium chloride and indium chloride in deionized water according to a mass ratio, and reacting to obtain a precursor solution of Li3InCl6; (2) adding commercial FeF3 subjected to ball milling into the precursor solution in the step (1), and uniformly mixing and stirring; (3) freeze-drying the mixed solution in the step (2) to obtain solid powder; and (4) calcining the solid powder in the step (3) in a protective atmosphere at 400 DEG C to obtain the halide electrolyte coated ferric fluoride positive electrode material. The preparation method of the halide electrolyte coating is simple in process and mild in condition, and the cycling stability of the ferric fluoride positive electrode material in the sulfide solid-state battery is remarkably improved.

The invention relates to a process line and a process for recovering metals and fluorides from a pickling line (1), comprising: a) retrieving a waste solution (WS) from a pickling liquor (PL), b) measuring iron, chromium and fluoride concentration in the retrieved waste solution (WS), c) precipitation of iron and chromium by addition of fluorides, while keeping a major portion of occurring nickel dissolved in the solution, d) separation of iron and chromium, e) precipitation of the nickel in the waste solution (WS) by the addition of basic additives, f) recuperation of the precipitated nickel, g) dissolving the iron fluoride and chromium fluoride from step d) to recuperate fluoride free, metal containing particles while keeping most of the fluorides dissolved, h) recuperation of the precipitated metal containing particles in step g), i) precipitating he CaF2 by addition of CaCl2 or Ca(OH)2, and j) recuperation of the CaF2 and dispensing the remaining liquid solution as wastewater (WW).

The invention discloses a lithium ion battery diaphragm and a preparation method and application thereof, the lithium ion battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises a binder, an inorganic filler, ceramic, a lithium salt, an additive and a dispersant; the binder is a polyvinylidene fluoride-hexafluoropropylene copolymer, the inorganic filler is one or a mixture of more of magnesium fluoride, tin fluoride, ferric fluoride and titanium nitride, and the additive is molybdenum disulfide. According to the invention, the polyvinylidene fluoride-hexafluoropropylene copolymer is used as a binder to construct a three-dimensional network structure, and the ceramic particles, the inorganic filler and the additive are added to develop the diaphragm with high heat resistance, high binding property, high ionic conductivity, high mechanical property and high wettability.

The application provides a catalyst for efficient catalytic conversion of primary and secondary hydrogen, a preparation method and application. The catalyst is composed of M-FeF3 / C, the mass of M accounts for 1-5% of the total mass of the catalyst; wherein: FeF3 exists in the form of hydroxyl iron fluoride; M is selected from one or both of Mn elements and Ni elements; and C is a porous carbon rod carrier. The catalyst has a porous carbon rod as a carrier, a metal modified hydroxyl iron fluoride as an active phase, is applied to a primary and secondary hydrogen catalytic conversion process under a reaction condition of 20K-77K, has a conversion rate of greater than or equal to 98%, high reaction activity, a wide applicable temperature range, good environmental applicability and potential application value.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to iron fluoride powder with different particle sizes obtained by ball-milling commercial iron fluoride and a method for preparing a lithium ion battery positive electrode material by using the powder. The method mainly comprises the following steps: (1) raw material preparation: selecting commercial ferric fluoride as a raw material, and carrying out purity detection on the commercial ferric fluoride to ensure that the purity of the ferric fluoride is not lower than 99%; (2) ball milling at 35: 1; the ball milling tank is filled with inert gas, such as argon, so that the raw materials are prevented from being oxidized in the ball milling process; the rotating speed of the ball mill is set to be 600-800 r / min, the ball milling time is 0.5-8 h, and the iron fluoride powder with different particle sizes is obtained by controlling the ball milling time and the rotating speed. The iron fluoride powder with relatively large particle size can be obtained at a relatively low rotating speed and relatively short ball milling time; the iron fluoride powder with a relatively small particle size can be obtained at a relatively high rotating speed and a relatively long ball milling time; and (3) powder collection and treatment: after ball milling is finished, powder in the ball milling tank is taken out and then dried in a vacuum drying oven at 60 DEG C for 2-6 h, and iron fluoride powder with different particle sizes is obtained.

The invention relates to the technical field of metal fluoride lithium ion batteries, in particular to a preparation method and application of a high-surface-capacity ferrous fluoride positive electrode. The method mainly comprises the following steps: (1) reacting reduced iron powder with a fluosilicic acid solution to obtain a precursor solution; (2) adding deionized water into the precursor solution for dilution, then adding conductive carbon nanotubes to obtain a mixed solution, and drying to obtain solid powder; and (3) calcining the solid powder at 250 DEG C in a protective atmosphere to obtain the nanoscale spherical ferrous fluoride. (4) mixing ferrous fluoride with polyvinylidene fluoride, anhydrous dextrose, polyacrylonitrile, conductive carbon and carbon nanotubes according to a certain proportion to obtain slurry; and (5) coating: the thickness of a metal scraper is 750 microns, and drying is performed in a vacuum drying oven at 60 DEG C to obtain the high-surface-capacity ferrous fluoride pole piece. The preparation method of the high-surface-capacity ferrous fluoride positive electrode is simple in process, mild in condition and low in cost, cracking of a pole piece under the load of a high-activity substance is avoided, a ferrous fluoride positive electrode material and loss thereof are effectively protected, and adverse reaction between the ferrous fluoride positive electrode material and electrolyte is prevented, so that the cycling stability of a liquid lithium ion battery is better improved, and the service life of the liquid lithium ion battery is prolonged. The battery life is prolonged.

This invention discloses a method for preparing an iron fluoride cathode, comprising preparing an intermediate product FeF3·0.33H2O using an Fe source and an F source, and then sintering the intermediate product FeF3·0.33H2O to obtain anhydrous FeF3 material FeF3-HT. The features and beneficial effects of this invention are: an anhydrous FeF3 material FeF3-HT, particularly suitable for sulfide all-solid-state batteries, is prepared using the intermediate product FeF3·0.33H2O, thereby obtaining a sulfide all-solid-state battery with ultra-high cycle performance and high capacity.

This invention belongs to the field of electromagnetic protection and stealth technology, and provides a graphene oxide-loaded iron fluoride composite microwave absorbing material, its preparation method, and its application. The iron fluoride nanoparticles in the graphene oxide-loaded iron fluoride composite microwave absorbing material provided by this invention have the chemical composition FeF3·0.33H2O. Compared with ferrite and anhydrous iron fluoride, they have lower density, stronger magnetism, and better conductivity. After adsorption onto the surface of graphene oxide, they can enhance their own magnetoelectric synergy and optimize impedance matching capabilities, allowing more electromagnetic waves to enter. Furthermore, the two-dimensional layered structure of the iron fluoride nanoparticles and graphene oxide makes it easier for electromagnetic waves to be reflected and scattered multiple times within the composite material, which can prolong the path of electromagnetic waves within the composite material and enhance electromagnetic wave absorption, thus facilitating the attenuation of more electromagnetic waves.

This invention discloses a palladium-potassium / nano-iron fluoride catalyst and its application in the synthesis of dodecylfluorodihydrohexane, aiming to solve the technical problems of cumbersome preparation processes, uneven dispersion of active components, and difficulty in controlling the preparation process in existing catalysts. The catalyst uses nano-iron fluoride as a support and palladium and potassium as active components. This catalyst exhibits excellent catalytic activity under relatively low reaction temperature and pressure conditions, and can efficiently catalyze the hydrogenation reaction of hexafluoropropylene dimer to produce dodecylfluorodihydrohexane, providing reliable technical support for the industrial-scale and efficient preparation of dodecylfluorodihydrohexane.

A high-voltage high-entropy metal fluoride positive electrode, a preparation method and applications thereof belong to the technical field of lithium ion batteries. Copper fluoride, iron fluoride, cobalt fluoride, nickel fluoride and manganese fluoride are mixed, sodium alginate is added, and high-entropy metal fluoride material uniformly fused with sodium alginate is obtained under argon protection ball milling; then, ketjen black is added under argon protection, and ball milling is carried out under the same conditions; the powder obtained by ball milling is mixed with a Mxene aqueous dispersion, coated on a titanium foil after ball milling, and dried to obtain a high-entropy metal fluoride positive electrode combined with a conductive binder. The application of high-entropy materials and high-conductivity cross-linked binders to copper fluoride positive electrodes utilizes the improvement of the two on the conductive capacity and the protection effect on copper fluoride, as well as the cross-linking effect among CuF2, SA and MXene, improves the conductive performance and cycle stability of the positive electrode, and enables the average discharge voltage of the full battery to break through 2.5V, so that it can be used for assembling full batteries.

The invention discloses a preparation method of a porous micron metal fluoride composite positive electrode material modified by carbon nanodots and application of the porous micron metal fluoride composite positive electrode material in a lithium ion battery. Taking carbon nanodot modified porous micron ferrous fluoride as an example, the material is prepared through a stepped in-situ synthesis strategy: a three-dimensional porous iron trifluoride skeleton is constructed by combining a liquid phase method with low-temperature calcination, and carbon nanodots are deposited and anchored in an acetylene atmosphere by using a chemical vapor deposition technology. According to the composite structure, the advantage of high volume energy density of a porous micron material is combined with a continuous conductive network constructed by carbon nanodots, and the inherent problems of poor conductivity and slow ion transmission of a traditional metal fluoride material are solved. The process is simple and controllable, a new thought is provided for development of the positive electrode material of the high-performance lithium ion battery, the industrial application potential is achieved, and meanwhile the wide popularization value is achieved in the aspect of synthesis methodology.

The invention discloses a layered ferric fluoride-based positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The preparation method comprises the following steps: preparing a graphene template; preparing a graphene template containing an iron source precursor; the preparation method comprises the following steps: mixing ethanol and an HF aqueous solution to prepare a mixed solution, transferring the mixed solution into a hydrothermal kettle, isolating the mixed solution from a graphene template containing an iron source precursor, carrying out fluorination treatment on the graphene template containing the iron source precursor through steam generated by the mixed solution, sequentially carrying out washing and vacuum drying to obtain an intermediate sample, and drying the intermediate sample to obtain the iron source precursor. The ferric fluoride in the intermediate sample grows between graphene template layers; and carrying out heat treatment on the intermediate sample under the protection of inert gas to obtain the layered ferric fluoride-based positive electrode material. The problem of side reaction caused by electrochemical reaction phase transformation, product phase separation, slow atom migration and Fe nano-particle aggregation of the ferric fluoride positive electrode material is solved.

The invention discloses a negative-electrode-free sodium metal battery negative electrode current collector coating and a preparation method thereof, relates to a sodium battery negative electrode and a preparation method thereof, and aims to solve the technical problems of high nucleation overpotential and poor stable circularity of an existing negative-electrode-free sodium battery. The negative current collector coating of the negative-electrode-free sodium metal battery is prepared from an active substance, a conductive carbon material and an adhesive, wherein the active substance is bismuth fluoride, ferric fluoride, tin fluoride, bismuth oxide, antimony oxide, bismuth phosphate, antimony phosphate, bismuth acetate, lead acetate or antimony acetate. The active substance, the conductive carbon material and the adhesive are prepared into slurry, and the slurry is coated on the fluid and then dried. The half cell assembled by using the negative electrode current collector and sodium realizes the average coulombic efficiency of more than 99.5%, and realizes stable circulation for 300 circles in a sodium battery without a negative electrode. The method can be used in the field of sodium batteries or sodium metal batteries.