295 results about "Oxalate" patented technology

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention discloses a method for preparing hafnium oxide from hafnium oxalate feed liquid through an oxidation precipitation method, and belongs to the technical field of hydrometallurgy. The specific method comprises the following steps: adding an oxidizing agent into hafnium oxalate feed liquid to destroy oxalate ions in hafnium oxalate so as to enable hafnium to form hydroxide precipitates; and separating the generated white precipitate, and roasting at high temperature to obtain hafnium oxide. The strong oxidant used in the method is low in cost, high in precipitation efficiency, green, environmentally friendly, free of large pollution to equipment and the environment and wide in application range. The method is simple in process, does not involve a complex process flow, does not need precise equipment, avoids a large amount of alkali liquor required by metal ion precipitation, is simpler in process flow, higher in efficiency and lower in cost, avoids the generation of a large amount of wastewater, and is very environment-friendly. And meanwhile, the process is wide in application range and suitable for various oxalic acid metal feed liquid.

The invention relates to a preparation method of a lithium difluoro bis (oxalate) phosphate concentrated solution, and belongs to the technical field of lithium battery electrolyte additives. Adding lithium oxalate into a solvent, stirring and dissolving to obtain a lithium oxalate solution; the method comprises the following steps: adding a modified fluorine ion chelating agent into a lithium oxalate solution, stirring, filtering, putting into a reactor, and slowly introducing phosphorus pentafluoride gas; after the introduction is finished, heating and stirring for reaction; after the reaction is finished, filtering reaction liquid to remove unreacted solid impurities, so as to obtain a lithium difluoro bis (oxalate) phosphate concentrated solution; the modified fluorine ion chelating agent is prepared from D301 ion exchange resin, dichloroethane, propylene-1-base boronic acid pinacol ester, mercaptoethyl guanidine dihydro bromide and sodium tert-butoxide. The lithium difluoro bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the use requirements of lithium ion battery electrolyte on lithium salt.

The invention relates to the technical field of new energy, in particular to a negative pole piece for a battery without a negative active material, a preparation method and application. The preparation method comprises the following steps: under the protection of inert gas, dissolving a fluoroborate-containing oxalate material in an in-situ polymerization monomer to form a solution; and then uniformly coating the surface of a metal current collector and carrying out heating in-situ polymerization to obtain the negative pole piece for the battery without the negative active material. The negative pole piece is applied to the battery, so that lithium (sodium) can be prevented from directly contacting with other components of the battery to generate side reaction, and high-temperature gas expansion of the battery is inhibited; meanwhile, the negative pole piece without the negative active material has a certain lithium (sodium) supplementing effect, can effectively induce uniform deposition of lithium (sodium) and inhibit generation of dendrites and dead lithium (sodium), and the first efficiency and the cycle capacity retention ratio of the battery are greatly improved.

The invention discloses a system and method for directly preparing battery-grade ferrous oxalate based on dimethyl oxalate, and the system comprises a rectifying tower which is used for carrying out hydrolysis reaction on dimethyl oxalate and discharging a hydrolysis solution through a liquid phase outlet; the decolorizing kettle is used for decolorizing the hydrolysis solution; the precipitation reaction kettle is used for carrying out mixed reaction and aging on the hydrolysis solution and ferric salt; the product recovery unit is connected with the precipitation reaction kettle and is used for separating and recovering reaction products to obtain battery-grade ferrous oxalate. According to the method, the hydrolysis solution of the dimethyl oxalate and the iron salt are directly mixed for precipitation reaction to prepare the battery-grade ferrous oxalate, high-energy-consumption steps such as crystallization and drying in the oxalic acid solid production process are reduced, meanwhile, the step of dissolving the solid oxalic acid is not needed, the heating energy consumption needed in the dissolving process is reduced, and the production efficiency is improved. The production energy consumption is greatly reduced, the production equipment and process are reduced, the cost is reduced, and the product yield is favorably improved.

The invention discloses a preparation method and application of a high-density iron-nitrogen-carbon monatomic catalyst. The method specifically comprises the following steps: S1, uniformly mixing nitrogen-doped carbon and ferrous oxalate; s2, in an inert atmosphere, carrying out a first pyrolytic reaction at 340-360 DEG C to obtain an intermediate, and meanwhile, carrying out etching on the carbon carrier by using CO2 gas generated by the reaction, so that a plurality of microporous structures are formed on the carbon carrier; s3, the intermediate continues to be subjected to a second pyrolytic reaction in the inert atmosphere at the temperature of 850-950 DEG C, the FeOx nano-particles are converted into Fe-N4 active sites, and a pyrolytic product is obtained; and S4, naturally cooling to room temperature to obtain the high-density iron-nitrogen-carbon monatomic catalyst. Superfine ferric oxide (FeOx) nano-particles are generated through a precursor to serve as intermediates, carbon defects are created through CO2 gas released in the decomposition process of the FeOx nano-particles, and therefore the oxygen reduction reaction performance of the catalyst is remarkably improved, and the catalyst is applied to fuel cells.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

The invention provides a method for removing organic matters through crystallization adsorption, and relates to the technical field of aluminum oxide. The method comprises the following steps: S1, taking a secondary overflow liquid obtained by secondary decomposition as a mother liquid, and adding a seed crystal into the mother liquid to obtain a mixed liquid; s2, carrying out solid-liquid separation on the mixed liquid in the step S1 to obtain seed crystals and filtrate; s3, grinding and activating the seed crystal in the step S2; s4, feeding the ground seed crystal into an induction tank for induction treatment; s5, circulating the fine seed crystal obtained in the step S4 into the mixing section of the induction tank in the step S4; and S6, conveying the filtrate obtained in the step S2 to a causticizing tank for causticizing reaction. According to the method, the aluminum hydroxide seed crystal is ground, the specific surface area and activity of the seed crystal are increased, the seed crystal and the sodium aluminate mother liquor are mixed and react to accelerate the crystallization precipitation speed of oxalate, and then the fine seed crystal is separated and washed for cyclic utilization, so that the expenses of water, electricity, steam and the like and related investments are saved.

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

The invention relates to the field of hydrometallurgy, and discloses a method for converting hafnium oxalate feed liquid into hafnium oxychloride feed liquid, which is characterized by comprising the following steps: adding an HCl solution and an oxidizing agent into the hafnium oxalate feed liquid, and reacting at a certain temperature to obtain a hafnium oxychloride solution. The method has the advantages of simple operation, no introduction of any metal impurity ions, small reagent consumption, low energy consumption, low cost, high efficiency, no physical state change, and realization of continuous production. The method for adding the HCl solution and the oxidizing agent into the oxalate feed liquid is also suitable for converting oxalate solutions of other metal ions into chloride solutions, including but not limited to zirconium oxalate, titanium oxalate, thorium oxalate, scandium oxalate, niobium oxalate, tantalum oxalate, vanadium oxalate, cobalt oxalate, cesium oxalate and rubidium oxalate.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

A MOF composition is formed from a reaction mixture comprising zinc ions, oxalate, and one or more substituted cycloazocarbyl compounds selected from either (a) at least two different cycloazocarbyl compounds, each of which is at least mono-substituted, or (b) at least one cycloazocarbyl compound that is di-substituted. The MOF composition can be used in a method of capturing carbon dioxide from a mixture of gases containing carbon dioxide. Also disclosed herein is a method of making the MOF composition.

This invention discloses a method for preparing a (111) preferred-oriented perovskite thin film based on substrate control, comprising: providing a substrate; forming a SnO2 electron transport layer on the substrate; forming a zinc oxalate (ZnOX) interlayer on the electron transport layer; and preparing the perovskite active layer on the ZnOX interlayer using a two-step sequential deposition method, wherein the perovskite active layer has a (111) preferred orientation; in this invention, the interaction between oxalate anions and PbI2 induces the formation of a porous PbI2 film, which, combined with Zn... 2+ The defect compensation and lattice regulation effects of the embedded perovskite lattice successfully induced the growth of a (111) preferred orientation perovskite thin film with large grains (up to 3 μm in size) and low defect density, and the (111) / (100) peak intensity ratio was improved by nearly 5 times. This invention achieves the simultaneous optimization of perovskite thin film structure and device performance with a simple and effective interface modification strategy, providing a new path that is both scientific and practical for the industrialization of high-performance long-life perovskite solar cells.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

This invention belongs to the field of metal powder preparation technology, and discloses a porous nickel powder, its preparation method, and its applications. The method includes: preparing nickel oxalate powder as a precursor; forming a nickel coating layer on the surface of the nickel oxalate powder by chemical plating to obtain nickel oxalate@nickel core-shell structured composite particles; subjecting the composite particles to pyrolysis annealing treatment, causing the internal nickel oxalate to decompose and generate gas, and the external nickel coating layer to transform into a porous metal framework, thereby obtaining porous nickel powder. This method is simple, low-cost, and produces nickel powder particles with uniform size, stable pore structure, good connectivity, and large specific surface area, making it suitable as a precursor for electrocatalytic active materials or porous electrode materials.

The invention provides preparation of a lithium oxalate / carbon material conductive lithium supplement agent and application of the lithium oxalate / carbon material conductive lithium supplement agent in a lithium ion battery, and the method comprises the following steps: S1, dissolving lithium oxalate in water to form an aqueous solution with the concentration of 5-20%; s2, a carbon material is added into the aqueous solution, the mass ratio of the carbon material to the lithium oxalate is 1: (0.1-3), lignocellulose (CNF), carboxymethyl cellulose (CMC), polyvinylpyrrolidone (PVP), alginic acid and the like accounting for 0.5-5 wt% of the mass of the carbon material are added, and uniform carbon material / lithium oxalate aqueous slurry is obtained through one or more dispersion methods of ultrasonic treatment, homogenization and ball milling; s3, drying the aqueous slurry to obtain a carbon material / lithium oxalate composite powder material; and S4, adding the powder into an NMP solution to obtain the lithium oxalate lithium-supplementing conductive paste. The preparation method comprises the following steps: firstly, compounding a lithium supplement agent (lithium oxalate) with a carbon material which comprises one or more of a carbon nanotube, graphene, conductive carbon black and porous carbon;

The invention relates to the field of solid waste resource recovery, in particular to a method for recovering iron, calcium and rare elements in red mud through cooperation of magnetic separation and oxalic acid. The method comprises the following steps: mixing red mud with a reducing agent, then carrying out reduction roasting at 600-900 DEG C, grinding the roasted clinker, then carrying out water leaching, carrying out solid-liquid separation, and washing; magnetic separation is conducted on the water leaching residues, and iron ore concentrate and non-magnetic residues are obtained; carrying out sulfuric acid leaching on the non-magnetic slag, filtering to remove impurities to obtain neodymium-rich leachate, treating the leaching residues with hydrochloric acid, and roasting to recover calcium; and oxalic acid is added into the neodymium-rich lixivium for precipitation, a neodymium oxalate product is obtained, and neodymium oxalate is roasted to obtain a neodymium oxide product. The method is simple in process and low in medicament consumption, and realizes efficient separation and comprehensive utilization of iron, calcium and rare elements.

The application provides a preparation method of an aldehyde hydrogenation catalyst, which adopts a step-by-step continuous co-precipitation mode and comprises the following steps: 1) mixing a zinc-aluminum mixed solution and a precipitation solution in parallel flow and controlling the pH to be 6.5-6.8; then adding a zinc-copper mixed solution and the precipitation solution in parallel flow, controlling the pH to be 7.5-7.8, and evaporating to form a gel; 2) drying and calcining the gel, adding graphite to press and form into a tablet, and obtaining the aldehyde hydrogenation catalyst; wherein the precipitation solution is formed by dissolving oxalate and a template agent P123 in a solvent. The aldehyde hydrogenation catalyst prepared by the method has high yield of metal ions in raw materials, small loss, no need of washing, reduced discharge of waste water, good activity and selectivity in high-carbon aldehyde high-temperature gas-phase hydrogenation, and the catalyst prepared by the method has large specific surface area and pore volume, so that the catalyst has high hydrogenation activity and high alkyl alcohol selectivity.

The invention discloses a treatment method of an emulsion generated by rare earth element extraction and separation, which comprises the following steps: adding an oxalic acid solution into the emulsion generated by rare earth element extraction and separation, stirring, decomposing the emulsion by oxalic acid, depolymerizing and layering; extracting supernatant liquid, filtering, and recovering an oxalic acid solution and an organic phase; and extracting a middle water phase, filtering together with the lower oxalate, recovering the oxalate and the oxalic acid solution, combining the oxalic acid solutions obtained twice, preparing the concentration, and returning to the emulsion decomposition and depolymerization process. According to the method, the emulsion is treated by oxalic acid, so that rare earth oxide and P507 organic phase in the emulsion are recovered, and the discharge amount of waste residues is reduced.

The application discloses a method for recycling waste lithium battery positive electrode materials by oxalic acid circulation and lithium hydroxide co-production. The method uses oxalic acid solution to leach the waste lithium battery positive electrode materials, so that the valuable metals are precipitated in the form of oxalate, after solid-liquid separation, the lithium oxalate solution is introduced into an integrated electrochemical recycling system. The system is provided with an ion separation chamber filled with anion exchange resin between the cathode chamber and the anode chamber in the electrolytic cell, which constitutes Li + purifier and H + Traps: the resin fixes oxalate on one hand, promotes Li + dissociation, on the other hand, captures and neutralizes H + migrated from the anode in situ to generate oxalic acid; at the same time, Li + goes through the cathode side cation exchange membrane, and combines with OH ‑ generated by electrolysis to form a lithium hydroxide solution. The regenerated oxalic acid solution can be used for leaching, and the oxalic acid reagent circulation is realized, and the high-purity lithium hydroxide product significantly improves the overall process economy.

This invention discloses a method for preparing difluorooxalate borate. The method includes the following steps: S100, placing the reactants in a mechanochemical reaction apparatus for a staged solid-phase transformation reaction to obtain crude difluorooxalate borate. The reactants are tetrafluoroborate and oxalic acid or oxalate. During the reaction, volatile substances generated are removed and recovered. S200, the crude difluorooxalate borate obtained in step S100 is subjected to crystallization treatment to obtain the difluorooxalate borate product. The method for preparing difluorooxalate borate provided by this invention uses tetrafluoroborate and oxalic acid or oxalate as reactants in a mechanochemical reaction apparatus. It does not require a large amount of reaction solvent, obtains the target product in one step without generating a large amount of waste liquid, and has a simple post-processing procedure. Byproducts are continuously removed during the reaction, promoting the forward reaction. This is a green and efficient method for preparing difluorooxalate borate.

The invention provides a preparation method of lithium iron phosphate, a positive active material, a positive pole piece, a battery and an electric device. The preparation method of the lithium iron phosphate comprises the following steps: dissolving a first iron source, a second iron source, a lithium source and a phosphorus source in a solvent to obtain mixed slurry; sintering the mixed slurry to obtain lithium iron phosphate; wherein the first iron source comprises at least one of iron oxide or first iron phosphate, and the second iron source comprises at least one of second iron phosphate or ferrous oxalate; the iron-phosphorus ratio of the first iron phosphate is 0.97-0.985, and the iron-phosphorus ratio of the second iron phosphate is 0.93-0.96. And the size and primary particle size mixing of the lithium iron phosphate can be realized, so that the compaction density of the lithium iron phosphate and the energy density of the battery are improved.

The invention discloses a preparation method and a recrystallization method of lithium bis (oxalato) borate. The invention provides a preparation method of lithium bis (oxalato) borate, which comprises the following steps: in a solvent, carrying out reaction on chain-like silicon oxalate as shown in a formula II and lithium bis (oxalato) borate to obtain lithium bis (oxalato) borate as shown in a formula III, the solvent is an aprotic organic solvent. The preparation method has one or more advantages as follows: the yield is high, the purity is high, insoluble substances are few, the chromaticity is low, free acid or chloride ions are lower, lithium bis (fluoro) oxalato borate can be recycled, and the cost is reduced.

This application discloses a method and its application for in-situ construction of hierarchical porous photocatalytic foam ceramics based on the pyrolysis of carbonates and / or oxalates. This method introduces a full spectrum of carbonate and / or oxalate precursors, including alkaline earth metals, transition metals, rare earth elements, and bismuth-based precursors, into an organic foam impregnation system. Combined with a gradient heat treatment process, during sintering, the following are simultaneously achieved: in-situ pyrolysis of the precursors to generate a highly dispersed metal oxide photocatalytic active phase; synergistic construction of micro- and macro-hierarchical channels through gas release and template decomposition; and in-situ construction of photocatalytic heterostructures based on a combination of metal cations. The resulting material possesses a three-dimensional interconnected pore structure, excellent mechanical stability, and broad-spectrum photocatalytic activity, enabling efficient degradation of recalcitrant emerging pollutants in water, such as antibiotics, perfluorinated compounds, and bisphenol A. This provides a structure-function integrated material solution for the engineering application of photocatalysis technology in environmental remediation.

The application discloses a recycling method of lithium iron phosphate black powder, which comprises the following steps: mixing sintered lithium iron phosphate black powder with a first acidic reagent and an oxidizing agent, and filtering to obtain a first solution and a first solid; performing impurity removal on the first solution to obtain lithium dihydrogen phosphate; mixing the sintered first solid with a first phosphoric acid solution to obtain a second solution; and performing impurity removal on the second solution to obtain ferrous oxalate.

The invention provides a penicillium oxalicum strain K3R2 and a preparation method and application of a biological agent of the penicillium oxalicum strain K3R2. The biocontrol bacterium Penicillium oxalicum strain K3R2 screened by the invention is preserved in the China General Microbiological Culture Collection Center on September 25, 2025, the preservation number is CGMCC NO.42219, and the preservation address is Institute of Microbiology, Chinese Academy of Sciences, No. 3, No.1 yard, Beichen West Road, Chaoyang District, Beijing; the ITS sequence of the Penicillium oxalicum strain K3R2 is as shown in SEQ ID NO: 1, and the CaM sequence is as shown in SEQ ID NO: 2. The penicillium oxalicum strain K3R2 provided by the invention can inhibit hypha growth and spore germination of beet neocam spores, the hypha inhibition rate is 83.60%, the spore inhibition rate is 65.31%, and the penicillium oxalicum strain K3R2 has the effect of preventing and treating quinoa stem blight. Meanwhile, the penicillium oxalicum strain K3R2 has the capabilities of salt resistance, alkali resistance, phosphate solubilization, potassium solubilization, cellulose solubilization and nitrogen fixation; the strain K3R2 remarkably promotes the growth of quinoa plants, so that the chlorophyll content is increased by 20.22%, and the accumulation of nutrient substances is accelerated; the fresh weight, the dry weight and the stem diameter of quinoa plants are increased, and the lodging resistance is enhanced.

The invention discloses a preparation method of a polyanion positive electrode material ferric sodium pyrophosphate (NFPP, chemical formula: Na4Fe3 (PO4) 2P2O7) without a physical sanding process, and relates to the technical field of synthesis of inorganic functional materials. According to the method, dependence of a traditional process on physical sanding is broken through, common industrial raw materials are adopted, an iron source is limited to be a mixed system of water-insoluble iron phosphate and ferrous oxalate (the molar ratio is 1: (0.005-0.5)), and the water-insoluble iron phosphate and the ferrous oxalate form a specific proportion and can generate a synergistic effect in a solution to accelerate reaction and dissolution; the molar ratio of sodium to iron to phosphorus is accurately controlled to be (4-4.04): (2.9-3): 4, the self-adaption of pH and raw material ratio (the pH is stabilized at 4-6) is synergistically realized by utilizing the characteristics of the raw materials, and the particle refining and dispersing effects of sanding are replaced by combining chemical complexing, step-by-step feeding and multi-parameter coordinated regulation. The process is highly compatible with an existing mass production process, rapid adaptation can be achieved without modifying a production line, the investment and energy consumption of sanding equipment are omitted, the energy consumption of a unit product is reduced by about 20%, and the comprehensive production cost is reduced by 10% or above; the product is pure-phase NFPP, the particle size D50 is 2-10 microns, the first specific discharge capacity is greater than or equal to 105mAh / g, the capacity retention rate after 500 cycles is greater than 95%, and the product is suitable for the fields of energy storage batteries, power batteries and the like and has huge industrial potential.

This invention relates to a method for preparing carbon-modified vanadium sulfide lithium-ion battery anode materials using vanadium-containing oxalate. The steps are as follows: vanadium-containing oxalate and ammonia are mixed, heated and stirred, filtered, and the filtrate is collected; hydrochloric acid is added while heating and stirring until the pH reaches 7-9, filtered, and the filtrate is collected; hydrogen peroxide and ammonium sulfate are added sequentially while heating and stirring, kept at a certain temperature for a period of time, filtered, and solid ammonium metavanadate is collected and dried; the dried ammonium metavanadate, ammonia, and deionized water are mixed, thioacetamide and acetylene black are added sequentially, ultrasonically treated, heated and kept at a certain temperature, naturally cooled, and the solid obtained by filtration is washed and dried to obtain acetylene black composite vanadium tetrasulfide, which is the carbon-modified vanadium sulfide lithium-ion battery anode material. The carbon-modified vanadium sulfide lithium-ion battery anode material prepared by the method of this invention exhibits superior electrochemical energy storage effect and cycle stability, demonstrating excellent rate performance.

The present invention relates to the technical field of wood-plastic composites, and provides a PVC wood-plastic material having strong smoke suppression and flame retardancy, and a preparation method therefor. The PVC wood-plastic material comprises the following components in parts by weight: 70-100 parts of a PVC resin, 20-30 parts of wood powder, 20-30 parts of calcium carbonate, 15-20 parts of a smoke suppression material, 10-15 parts of a flame retardant, 1-6 parts of a foaming agent, 5-10 parts of a stabilizer, 1-2 parts of a coupling agent, 5-10 parts of a processing aid, and 1-4 parts of a lubricant, wherein the smoke suppression material comprises a molybdenum compound, ferrocene and an oxalate dihydrate in a mass ratio of 1:(0.5-1.5):(5-10). The preparation method comprises the end-capping modification of the wood powder and the preparation of the PVC wood-plastic material. The prepared PVC wood-plastic material has excellent flame retardancy and smoke suppression properties.

This invention relates to the field of fertilizers, specifically to an organic fertilizer containing *Penicillium oxalate* and *Trichoderma echinococcosis*, and its preparation method. The organic fertilizer, by weight percentage, comprises: 10%-25% *Penicillium oxalate*, 10%-25% *Trichoderma echinococcosis*, 10%-20% sheep manure, 5%-10% ammonium phosphate, 5%-10% potassium fertilizer, 10%-20% straw ash, 1%-5% glyphosate, 1%-5% 6-benzylaminopurine, with a binder to make up 100%. The active ingredients of this invention are *Penicillium oxalate* and *Trichoderma echinococcosis*. It is mainly used to increase the yield of vegetables, flowers, and other crops while preventing fungal diseases such as anthracnose and black rot.