15 results about "Iron phosphide" patented technology

A catalytic electrode includes a nickel-based porous base material, and a plurality of catalytic alloy balls of nickel and another metal doped with elements, in which the another metal includes iron, the elements include C, F, and S, and the catalytic alloy balls are dispersed on the surface of the nickel-based porous base material. The catalytic electrode also includes a plurality of metal phosphide particles covering the nickel-based porous base material and the catalytic alloy balls, and the metal phosphide particle includes nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

The application discloses a kind of foam nickel load iron nickel bimetallic phosphide heterojunction catalyst and its preparation method and application, belong to electrocatalytic material technical field.The application is in situ grown by hydrothermal deposition in combination with low-temperature phosphorization process, and is prepared on foam nickel base Phosphide iron / Phosphide nickel heterojunction catalyst (Fe2P / Ni2P@NF).The prepared catalyst shows excellent performance in the electrocatalytic reduction of nitrate synthesis ammonia and high nitrate wastewater degradation.The preparation process of the catalyst of the application is simple, low in cost, and little to environmental pollution, and the self-supporting electrode prepared by integration can be directly applied to proton exchange membrane electrolytic cell, and has wide application prospect.

This application provides a lithium iron phosphate cathode material, its preparation method, a cathode sheet, and a secondary battery, relating to the field of secondary battery technology. The preparation method of the lithium iron phosphate cathode material includes the following steps: mixing lithium iron phosphate material containing iron phosphide, an oxidizing lithium source, a phosphorus source, an oxidant, water-soluble organic titanium, and a carbon source to obtain a mixture; mixing the mixture with an aqueous phase and subjecting it to gelatinization treatment to obtain a slurry; and sequentially subjecting the slurry to drying and sintering treatments to obtain the lithium iron phosphate cathode material. The technical solution of this application aims to solve the technical problem that the high iron phosphide content in lithium iron phosphate materials makes it difficult to simultaneously achieve good capacity and charge-discharge performance.

This invention belongs to the field of acyclic compound technology, specifically relating to a method for preparing tert-amyl peroxide. A tert-amyl hydrogen peroxide aqueous solution is added to a solvent and stirred to obtain a mixed solution. Under stirring conditions, p-toluenesulfonic acid and ferric phosphide are added sequentially to the mixed solution. After the addition is complete, stirring continues to produce reaction solution I. Under stirring conditions, acetic anhydride is added to reaction solution I. After the addition is complete, stirring continues to produce reaction solution II. A washing solution is added to reaction solution II, and the mixture is stirred and washed, then separated to obtain crude tert-amyl peroxide. The crude tert-amyl peroxide is washed, dried, and the solvent is removed to obtain tert-amyl peroxide. This invention avoids the problems of large amounts of hydrochloric acid produced by traditional acyl chloride methods and the corrosiveness caused by using sulfuric acid as a catalyst. Furthermore, ferric phosphide is magnetic, allowing for recycling through magnetic separation after the reaction. p-Toluenesulfonic acid can be regenerated through ion exchange resin, significantly reducing production costs.

This application belongs to the field of electrocatalysis and photoelectrocatalysis materials technology, specifically relating to a nickel phosphide-iron phosphide self-supporting electrode, its preparation method, and its application. This application provides a method for preparing a nickel phosphide-iron phosphide self-supporting electrode, which directly constructs an active layer on a conductive nickel foam substrate through in-situ hydrothermal growth combined with a gas-phase phosphating strategy. The nickel foam not only acts as a conductive current collector but also participates in the growth of the precursor as a reaction substrate, enhancing the bonding force between the active layer and the substrate, completely avoiding the use of binders, and effectively reducing interfacial resistance. The phosphating treatment transforms the nickel-iron precursor into a phosphide with metal-like properties, significantly improving the electrode's conductivity and intrinsic catalytic activity, thereby solving the problem of slow reaction kinetics.

This invention discloses a method for preparing high-compact lithium iron phosphate (LFP) cathode material and the prepared LFP cathode material. Using lithium, iron, phosphorus, and carbon sources as raw materials, the LFP cathode material is prepared via a high-temperature solid-state method. A flux is added to the raw materials, and the flux is selected from one or more of magnesium carbonate, magnesium iodide, and magnesium hydroxide. This invention uses magnesium-containing compounds such as magnesium carbonate, magnesium iodide, and magnesium hydroxide as fluxes, enabling the preparation of LFP cathode material under low-temperature sintering conditions. This significantly reduces energy consumption, effectively avoids the generation of magnetic foreign matter such as iron phosphate, reduces electron transport resistance, and promotes particle densification growth. The compacted density of the prepared LFP cathode material is not less than 2.467 g / cm³. 3 The resistivity is not higher than 32.5 Ω•cm.

This invention discloses a lithium iron phosphate and its preparation method. The preparation process uses a conventional carbon source, polyethylene glycol (PEG), and an organic compound containing sulfonic acid groups as a composite carbon source. PEG promotes the uniformity of raw material mixing and carbon coating. SO3, generated from the decomposition of sulfonic acid groups, has a certain oxidizing property and counteracts the reducing atmosphere on the surface of lithium iron phosphate particles, inhibiting the excessive reduction of lithium iron phosphate to iron phosphide. The pyrolysis and carbonization of PEG and the sulfonic acid-containing organic compound compensate for the uneven coating problem of conventional carbon sources, forming a uniform conductive carbon layer on the surface. This significantly improves the electronic conductivity of the finished lithium iron phosphate cathode material, suppresses electrolyte side reactions, and thus improves initial efficiency and rate performance. The sulfonic acid compounds have high chemical stability, ensuring that more sulfonic acid compounds decompose during the high-temperature calcination stage, thereby ensuring the thoroughness and effectiveness of inhibiting the excessive reduction of lithium iron phosphate to iron phosphide.

This application relates to the field of materials testing technology and provides a separation and detection method suitable for the separation and detection of metallic magnetic foreign matter in lithium iron phosphate. The method includes the following steps: obtaining a primary concentrate from lithium iron phosphate slurry using a magnetic rod; placing the primary concentrate in an aqueous solution containing a viscous dispersant, using a magnet to attract and move it, separating the strongly magnetic metallic foreign matter; performing microscopic observation on the weakly magnetic impurities discharged after separation to distinguish the strongly magnetic metallic foreign matter from iron phosphide; and performing digestion treatment on the strongly magnetic metallic foreign matter and performing elemental quantitative analysis. This application achieves efficient separation of strongly magnetic metallic foreign matter from iron phosphide through a three-stage treatment method of primary screening, viscous dispersant separation, and digestion treatment, thereby improving the accuracy of the detection results. Microscopic observation further verifies and ensures the separation effect of strongly magnetic metallic foreign matter from the weakly magnetic impurity iron phosphide, thus contributing to the accuracy of the detection results.

The application provides a composite manganese iron lithium phosphate positive electrode material and a preparation method and application thereof. The composite manganese iron lithium phosphate positive electrode material comprises a lithium iron phosphate core and a successively laminated iron phosphide intermediate layer and a composite coating layer on the surface of the lithium iron phosphate core. The composite coating layer comprises a carbon material coated manganese iron lithium phosphate material. The composite manganese iron lithium phosphate positive electrode material has a core-shell structure, the core is a phosphoric acid iron coated lithium iron phosphate, and the shell layer is a carbon coated manganese iron lithium phosphate coating layer. The unique structure design of the lithium iron phosphate core and the manganese iron lithium phosphate shell layer enables the composite material to have excellent electrochemical performance.

This invention belongs to the field of energy catalysis technology and provides a black phosphorus-ferric tetraphosphide composite nanocatalyst, which is a nano-binary composite structure formed by pebble-shaped ferric tetraphosphide nanocrystals encapsulated by black phosphorus crystals. This invention uses a one-step ball milling synthesis process, under appropriate process conditions, to directly convert red phosphorus powder and iron powder into nanoparticles with a black phosphorus-ferric tetraphosphide composite composition. After simple washing and dispersion, the active sites distributed on the surface are further exposed. Characterization tests revealed a large number of nanoscale black phosphorus-ferric tetraphosphide two-phase structures in the catalyst. Electrocatalytic experiments verified that this novel material exhibits excellent activity in the electrocatalytic synthesis of ammonia.

This invention provides a modified iron phosphate material, its preparation method, and its applications. The modified iron phosphate material has a core-shell structure, with a nitrogen-doped iron phosphate core and an iron phosphide coating layer on the outer shell. The modified iron phosphate material has a three-dimensional petal-like structure. This three-dimensional petal-like structure provides ample mass transfer channels for lithium ion storage and migration, shortening the lithium ion diffusion path. Simultaneously, this structure increases the contact area between the electrode material and the electrolyte, promoting the lithiation / delithiation process. Nitrogen doping effectively adjusts the electronic structure of the iron phosphate material, thereby improving its conductivity. The iron phosphide coating layer has excellent conductivity, reducing the amorphous carbon content of the cathode material, thus increasing the compaction density of the cathode material. Furthermore, this coating layer can alleviate the volume expansion of the cathode material during charge and discharge processes. Together with the three-dimensional petal-like structure, it can enhance the overall electrochemical performance of the cathode material.

A catalyst electrode and a method of forming the same and an electrolysis device are disclosed. The catalyst electrode includes a nickel-based porous substrate; a plurality of catalyst alloy spheres of nickel and other metals, doped with a plurality of elements, the other metals including iron, and the elements including C, F, and S, and the catalyst alloy spheres being dispersed on a surface of the nickel-based porous substrate; and a plurality of metal phosphide particles coated on the nickel-based porous substrate and the catalyst alloy spheres, and the metal phosphide particles including nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

The application discloses high-compaction low-iron-dissolution lithium iron phosphate and a preparation method and a lithium battery thereof, and belongs to the technical field of lithium ion battery cathode materials. The preparation method comprises the following steps: mixing, granulating, drying a phosphoric acid iron precursor, a lithium source and a carbon source, and then sintering in a sintering kiln, wherein a mixed atmosphere mainly composed of nitrogen and containing trace oxygen is used in a high-temperature reaction section, the volume fraction of oxygen is 50ppm-3000ppm, and the temperature of the high-temperature reaction section is 800 DEG C-840 DEG C; and the target product is obtained after cooling, crushing and iron removal. By introducing controlled trace oxygen in the high-temperature crystallization section, the generation of iron phosphide by-products is inhibited, the compaction density of the obtained lithium iron phosphate material powder is not lower than 2.60g / cm 3 , the iron ion dissolution rate is not higher than 20mg / L, and the cycle stability is good. The method has strong process amplification and is suitable for continuous and large-scale production of high-compaction lithium iron phosphate materials for large-capacity energy storage cells.

The application belongs to the technical field of chemical reducing materials, and specifically discloses a nitrogen and phosphorus co-doped carbon-based confined ferrophosphorus composite material, a preparation method and application thereof, and regeneration. First, iron precursor molecules, zinc salt, organic ligand and solvent are mixed to perform a polymerization reaction to obtain Fe@ZIF-8 material; then, the Fe@ZIF-8 material and a phosphorus source are sequentially subjected to phosphorization reaction and carbonization reaction to obtain the nitrogen and phosphorus co-doped carbon-based confined ferrophosphorus composite material. In the material, P doping can improve the specific surface area, electron transfer capacity and dispersibility of the material. Fe2P active sites formed by coordination of Fe and P significantly inhibit Fe leaching in the reaction process, and enhance the stability of the material; the material can efficiently reduce and remove bromate ions and other harmful substances in a wide pH value range; and the material can be regenerated by phosphorization, and a high reduction rate is maintained.