364 results about "Lithium fluoride" patented technology

The invention discloses high-toughness ultrathin flexible glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The ultrathin flexible glass is prepared from the following raw materials: silicon dioxide, aluminum oxide, lithium oxide, sodium oxide, magnesium oxide, a modified nano reinforced phase, a high-temperature melting regulator and cerium dioxide. The modified nano reinforced phase is prepared by the following steps: pre-treating silicon carbide and silicon nitride with hydrochloric acid, and mixing with nano zirconium oxide to obtain a mixture; and modifying the mixture with a silane coupling agent to obtain the modified nano reinforced phase. The high-temperature melting regulator is a mixture of lithium borate, sodium sulfate and lithium fluoride. The preparation method of the ultra-thin flexible glass comprises the following steps: preparing the modified nano reinforced phase, melting and homogenizing the glass, forming the glass substrate, and preparing the ultra-thin flexible glass. The ultra-thin flexible glass prepared by the invention has relatively high fracture toughness and structural rigidity, excellent flexibility and bending fatigue durability, and excellent thermal shock resistance.

The invention provides a solid electrolyte modified positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: a) dissolving an inorganic oxide electrolyte intermediate product in a mixed solution of water and an organic matter containing functional groups, adjusting the pH value to 2-9, adding lithium fluoride, stirring, and then evaporating and drying to obtain a first gel product; b) performing puffing treatment on the first-time gel product obtained in the step a), adding the first-time gel product and a ternary positive electrode material into a solvent, performing ultrasonic dispersion, stirring, and performing evaporation drying to obtain a second-time gel product; and c) sintering the second gel product obtained in the step b) in an oxygen-free environment to obtain the solid electrolyte modified positive electrode material. According to the invention, through cooperation of liquid-phase coating and high-temperature solid-phase diffusion treatment, a sintered stone structure with high ionic conductivity and high stability is introduced to the surface of the ternary material, and the problem of cyclic cracking of the ternary positive electrode material can be effectively solved.

Provided are a wide-temperature-range solid-state electrolyte, a preparation method thereof and use thereof in solid-state lithium metal batteries. The preparation method includes: dissolving a lithium salt and a magnesium salt in a solvent to obtain a mixed salt solution; and mixing the mixed salt solution with an ammonia fluoride solution, subjecting a resulting mixture to reaction, and subjecting a resulting reaction product to centrifugation, washing, and drying in sequence to obtain magnesium-doped lithium fluoride nanoparticles; and mixing the magnesium-doped lithium fluoride nanoparticles, a liquid plasticizer, a polymer monomer and a thermal initiator to obtain a liquid precursor, and subjecting the liquid precursor to curing to obtain the wide-temperature-range solid-state electrolyte, where the polymer monomer is a mixture of ethoxylated trimethylolpropane triacrylate and hexafluorobutyl methacrylate.

The invention discloses a lithium fluoride in-situ coated sulfide solid electrolyte and a preparation method thereof, and belongs to the technical field of solid-state lithium batteries, the preparation method comprises the following steps: mixing a sulfide solid electrolyte with lithium tetrafluoroborate to obtain mixed powder, and under the disturbance of inert gas flow, carrying out a heat-preservation and pressure-maintaining reaction to obtain the lithium fluoride in-situ coated sulfide solid electrolyte. After the reaction is finished, naturally cooling to room temperature to obtain a lithium fluoride coated sulfide solid electrolyte; the mass fraction of the lithium tetrafluoroborate in the mixed powder is 1-10%. The lithium tetrafluoroborate used in the preparation method provided by the invention is a common salt, no gas or liquid is generated in the reaction process, the preparation method is environment-friendly, the process is simple, and later industrial preparation is facilitated; the lithium tetrafluoroborate has the advantages of low cost and environmental friendliness; and particularly, the sulfide solid electrolyte can be uniformly dispersed and uniformly coated on the surface under airflow disturbance.

The preparation method comprises the following steps: mixing cobalt acetate, a modified ligand, a modified additive and DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding deionized water and a modified filler, carrying out ultrasonic treatment, carrying out heating reaction, carrying out centrifugation to remove a supernatant, and carrying out drying treatment to prepare the rapid-charge high-capacity artificial graphite negative electrode material, when the cobalt acetate, the modified ligand, the modified additive and the modified filler are subjected to blending reaction, carboxyl on the modified ligand and carboxyl on the modified additive can form coordinate bonds with cobalt ions of the cobalt acetate, then a cobalt metal organic framework is formed on the surface of the modified filler, and a fluorine element in the modified ligand can react with lithium to form lithium fluoride; electron penetration is effectively blocked, and side reactions are reduced; the lithium ion diffusion energy barrier is reduced, rapid charging and discharging are achieved, pyridine groups on the surface of the modified filler can provide lone pair electrons and serve as binding sites of lithium ions, pseudocapacitance is formed, and then the capacity is increased.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention provides positive electrode slurry of a low-temperature lithium carbon fluoride battery and a slurry homogenizing method, the positive electrode slurry comprises a positive electrode active material, perfluorooctyl sulfonate, a binder, a conductive agent and a solvent, and the mass ratio of the positive electrode active material to the perfluorooctyl sulfonate is (85-90): (1-6); the homogenizing method comprises the following steps: uniformly mixing a positive electrode active material, perfluorooctyl sulfonate and a conductive agent according to a ratio to obtain a first mixture; dissolving a binder in a solvent according to a ratio to obtain a second mixture; and uniformly mixing the first mixture and the second mixture to obtain the positive electrode slurry of the low-temperature lithium carbon fluoride battery. The perfluorooctyl sulfonate is introduced into the positive electrode slurry, and through the synergism of the following effects: the diffusion path of lithium ions is reduced, the desolvation energy barrier of the lithium ions is reduced, the conductive agent is uniformly dispersed and participates in electrochemical reaction to generate fluoride with conductivity better than that of lithium fluoride, and the electrochemical performance of the low-temperature lithium carbon fluoride battery is improved.

The invention discloses a metal fluoride molten salt coated silicon-based negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery negative electrode materials. The lithium fluoride-containing coating layer is constructed on the surface of the silicon negative electrode material by using the low-melting-point composite metal fluoride molten salt at a relatively low temperature through a molten salt coating method, so that the first effect and the cycling stability of the silicon-based negative electrode material can be effectively improved, and the preparation method has a good application prospect.

The invention discloses a preparation method of a carbon composite material doped with multiple metal elements. The preparation process comprises the following steps: S1, dispersing a porous carbon precursor, organic lithium fluoride, an organic rare earth compound and an organic catalyst in a solvent, performing hydrothermal reaction, and drying to obtain a porous carbon precursor loaded with lithium / rare earth element / catalyst; s2, uniformly mixing the obtained material with an activating agent and a doping agent, and activating at the temperature of 900-1100 DEG C to obtain multi-metal element doped porous carbon; and S3, carrying out reduction treatment and surface passivation treatment on the multi-metal element doped porous carbon to obtain the multi-metal element porous carbon composite material. According to the obtained material, lithium-doped and rare earth-doped porous carbon is utilized to improve the electronic conductivity of the material and increase the interlayer spacing of the carbon material, a carbon nanotube is grown by utilizing a catalyst to improve the conductivity of the material and reduce expansion, and through reduction and passivation treatment, the surface activity of the material is reduced, and the first efficiency is improved.

Disclosed in the present invention are a lithium metal composite material, and a preparation method therefor and the use thereof. The lithium metal composite material comprises a lithium-containing core, wherein a modification layer is arranged on the surface of the lithium-containing core; the modification layer comprises carbon nanotubes and a carbon fluoride material; and the carbon nanotubes are interwoven to form a cage-shaped structure, and the carbon fluoride material is present on at least one of the surface of the lithium-containing core, the surface of the cage-shaped structure and pores in the cage-shaped structure. The carbon nanotubes in the modification layer are interwoven to form the cage-shaped structure, which can provide space for the volume change of the lithium-containing core and can also provide support for the carbon fluoride material. Fluorine in the carbon fluoride material reacts with the lithium in the lithium-containing core in situ to generate lithium fluoride, thereby constructing a stable SEI film on the surface of the lithium-containing core. The modification layer constructs a stable electron transport network while modifying the surface of the lithium-containing core, thereby effectively regulating the current density and solving the problem of lithium dendrites generated due to a non-uniform current.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

The invention provides a high-performance silicon negative electrode material prepared from modified photovoltaic crystalline silicon waste and a preparation method of the high-performance silicon negative electrode material, and belongs to the technical field of lithium ion battery silicon negative electrodes. The method comprises the following steps: adding the photovoltaic crystalline silicon waste into acid liquor for acid leaching and impurity removal, and drying to obtain pretreated silicon powder; transferring into a fluidized bed ALD reaction cavity, regulating and controlling the air flow fluidization speed, alternately introducing a metal precursor source and an oxygen source, and purging redundant products to obtain silicon / metal oxide powder; and alternately introducing a lithium source and a fluorine source, and purging redundant products to obtain silicon / metal oxide / lithium fluoride powder. And the deposited metal oxide not only can slow down the volume expansion of the silicon waste material in the charging and discharging process, but also can effectively stabilize the SEI layer and slow down the crushing and reconstruction of the SEI layer and the consumption of lithium, so that the cycling stability of the lithium ion silicon-based negative electrode is improved. The lithium fluoride coating can be beneficial to construction of stable SEI, and the SEI layer rich in lithium fluoride can provide a fast ion channel, so that the material has excellent rate capability.

The present invention relates to a method for improving the yield of a lithium solution through concentration and crystallization, and, more specifically, to improving the yield of a lithium solution by reacting a low-concentration lithium solution with a fluorine compound so as to prepare lithium fluoride, and then concentrating and crystallizing a filtrate.

The invention discloses an interfacial film, a preparation method thereof and an application of the interfacial film in assembly of a lithium ion battery, the interfacial film comprises the following components: lithium salt, polyvinylidene fluoride and 1-butyl-2, 3-dimethyl imidazole onium chloride, the mass ratio of the lithium salt to the polyvinylidene fluoride to the 1-butyl-2, 3-dimethyl imidazole onium chloride is about 1: 0.9-1.1: 0.9-1.1, preferably about 1: 0.95-1.05: 0.95-1.05, and the mass ratio of the lithium salt to the polyvinylidene fluoride to the 1-butyl-2, 3-dimethyl imidazole onium chloride is 1: (0.9-1.1): (0.9-1.1), preferably about 1: (0.95-1.05). The weight-average molecular mass of the polyvinylidene fluoride is about 90-110 thousand g / mol, the lithium salt is lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) and / or lithium bis (fluorosulfonyl) imide (LiFSI), the purity of the lithium salt is greater than 99.9%, the polyvinylidene fluoride (PVDF) is selected as a polymer matrix, and is compounded with the ionic liquid 1-butyl-2, 3-dimethyl imidazolium chloride (BMMImCl) and the lithium salt, so that the performance of the lithium ion battery is improved. According to the present invention, the novel interfacial film is prepared, and the interfacial film has characteristics of high temperature resistance, chemical stability, excellent ion transmission characteristic, excellent lithium ion adsorption capacity, excellent performance, and wide application prospect in the lithium battery field.

The invention provides a solid electrolyte, a preparation method and a lithium battery, the solid electrolyte comprises a nitrate ion liquid-based metal organic framework C, polyoxyethylene and LiTFSI, the nitrate ion liquid-based metal organic framework C accounts for 3wt% of the polyoxyethylene, and the molar ratio of the polyoxyethylene to the LiTFSI is 10: 1; wherein the nitrate ion liquid-based metal organic framework C has a nitrogen-containing heterocyclic ring, and nitrate ions and Zn ions are coordinated on the nitrogen-containing heterocyclic ring. In the solid electrolyte provided by the invention, nitrogen-containing heterocyclic cations in the nitrate ionic liquid-based metal organic framework have a binding effect on TFSI-anions in the lithium salt, and meanwhile, dissociation of the lithium salt is promoted, so that lithium fluoride is generated in situ. Moreover, nitrate ions obtain electrons on the surface of the lithium metal negative electrode, and the electrons and lithium ions form lithium nitride in situ on the SEI layer, so that deposition of dead lithium is reduced, and finally, the interface stability of the battery is remarkably improved.

The invention discloses a method for recycling and regenerating a positive electrode material of a waste lithium iron phosphate battery, and relates to the technical field of positive electrode materials of lithium iron phosphate batteries. When the lithium iron phosphate battery positive electrode material is prepared, recycled lithium carbonate, recycled iron oxide red, ammonium dihydrogen phosphate, lithium fluoride, cerium nitrate hexahydrate, lanthanum nitrate hexahydrate and glucose are mixed and calcined to prepare doped modified lithium iron phosphate; coating the surface of the doped modified lithium iron phosphate with polyaniline to prepare polyaniline-coated lithium iron phosphate; and mixing the polyaniline-coated lithium iron phosphate, a conductive agent and a binder, and coating an aluminum foil with the mixture to prepare the positive electrode material of the lithium iron phosphate battery. The lithium iron phosphate battery positive electrode material prepared by the invention has good cycle performance.

The application provides a preparation method of a high-rate and high-sphericity lithium iron phosphate positive electrode material, in which iron phosphate and a lithium source are weighed according to a certain proportion and dispersed in pure water, a slurry A is obtained after mixing and sand milling; under stirring, a small amount of a fluorine source is added into the slurry A to obtain a lithium fluoride doped slurry B; under stirring, an organic carbon source is added into the slurry B to obtain an electrostatic spinning stock solution C, and a high-rate and high-sphericity lithium iron phosphate composite positive electrode material is obtained after drying and high-temperature calcination. The lithium fluoride doped stock solution is synthesized through in-situ reaction of the fluorine source and the lithium source, and the uniformly doped precursor is prepared through electrostatic spinning; the generated lithium fluoride acts as a fluxing agent to promote the formation of the high-sphericity lithium iron phosphate in the sintering process; meanwhile, the doping of the fluorine ion weakens the interaction between Li-O, which is beneficial to the extraction / insertion of lithium ions in the bulk phase during charging and discharging, and the lithium fluoride is rich in the conductive carbon layer, thereby improving the migration efficiency of lithium ions at the positive electrode / electrolyte interface.

The invention belongs to the technical field of oil and gas exploitation and oilfield chemistry, and relates to an amphiphilic Ti3C2Tx-based flexible nanosheet oil-displacing agent and a preparation method thereof. The preparation method comprises the following steps: taking Ti3AlC2 as a raw material, preparing a single-layer / few-layer flexible Ti3C2Tx nanosheet by utilizing a modified acid (hydrochloric acid and lithium fluoride) etching method, and further performing chemical modification on the single-layer / few-layer flexible Ti3C2Tx nanosheet by utilizing a hydrophobic silane coupling agent to prepare the amphiphilic Ti3C2Tx-based flexible nanosheet. By introducing the hydrophobic chain segment, the prepared amphiphilic Ti3C2Tx-based flexible nanosheet has the property of changing an oil-water interface and the oil shoveling capacity, is suitable for water injection development operation of oil and gas fields, and can effectively improve the crude oil recovery rate.

The invention relates to the technical field of batteries, and provides a silicon negative pole piece, a sodium ion solid-state battery and a preparation method thereof, the silicon negative pole piece comprises a current collector and an active material layer arranged on the current collector; the active material layer comprises a binder and an active material; the binder comprises a polymer and a carboxylic acid compound forming gradient hydrogen bonds with a main chain of the polymer; the polymer contains a conductive polymer. A coating layer is formed on the surface of a silicon particle by introducing a proper functional group into a binding agent of a silicon negative electrode plate, and the coating layer can generate dipole moment interaction with fluorides in an electrolyte when being applied to a sodium ion solid-state battery, so that the fluorides are promoted to be reduced, and a lithium fluoride-rich SEI (Solid Electrolyte Interphase) film is generated; the stability of the silicon negative electrode plate is improved, and the cycling stability of the sodium ion solid-state battery is finally improved.

The invention discloses a bipolar electrode with a composite structure and a preparation method and application thereof. The bipolar electrode comprises a positive electrode, a current collector and a composite negative electrode, wherein the current collector is positioned between the positive electrode and the composite negative electrode; the composite negative electrode comprises a lithium negative electrode and a modification layer positioned on the surface of the lithium negative electrode, wherein the modification layer comprises a carbon fluoride material, lithium fluoride generated by in-situ reaction of the carbon fluoride material and the lithium negative electrode, a conductive agent and an organic polymer. And the modification layer plays a role in isolating the lithium negative electrode from the solid electrolyte, so that the problem that the solid electrolyte reacts with metal lithium is solved, and the stability of an interface is improved. And lithium fluoride in the modification layer plays a role in stabilizing the interface between the solid electrolyte and the lithium negative electrode. According to the bipolar electrode, the long cycle performance and the high safety characteristic of the battery are optimized through the reasonably designed structure.

The invention belongs to the technical field of nano sensing and gas monitoring, and discloses an MXene / ZnO nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, etching Ti3AlC2 by using hydrochloric acid and lithium fluoride to obtain multi-layer two-dimensional MXene, and then carrying out ultrasonic stripping and freeze drying to obtain few-layer MXene; carrying out alkalization treatment on few layers of MXene, and then carrying out centrifugal cleaning to obtain 1D / 2D-MXene with a composite structure; the preparation method comprises the following steps: adding 1D / 2D-MXene and zinc acetate dihydrate into a mixed solution of water and ethanol, and carrying out a hydrothermal reaction; the preparation method comprises the following steps of: performing centrifugal cleaning and vacuum drying to obtain a multi-level 1D / 2D-MXene / 0D-ZnO nano-composite structure consisting of 0D-ZnO, 1D-MXene and 2D-MXene, and the multi-dimensional nano-composite structure is suitable for preparing a gas sensor and is used for detecting low-concentration nitrogen dioxide gas at room temperature. The nano composite material and the sensor prepared by the invention show excellent gas-sensitive performance on nitrogen dioxide gas, are high in sensitivity, can realize normal-temperature detection, and have relatively great application potential.

The application provides a method for separating lithium salt and carbonate organic solvent from lithium battery waste electrolyte, belongs to the technical field of waste liquid comprehensive utilization, and is used for lithium ion battery production and lithium battery recycling processes, wherein part of waste electrolyte is generated, mainly containing carbonate organic solvent and lithium salt; the application first separates the carbonate and lithium salt by adopting thin film evaporation; after neutralization, the light component carbonate solvent enters a rectification system to realize the separation of carbonates, and various carbonate products meeting the national standard requirements are obtained; after high-temperature incineration cracking and removal of residual organic impurities, the heavy component lithium salt is recycled in the form of lithium fluoride; the process realizes comprehensive utilization of the waste electrolyte, and avoids waste of lithium elements and carbonate solvents.

This invention provides a method and apparatus for preparing lithium bis(fluorosulfonyl)imide. The preparation method includes the following steps: (1) mixing bis(fluorosulfonyl)imide with lithium fluoride and reacting by heating to obtain a lithium bis(fluorosulfonyl)imide solution; (2) subjecting the lithium bis(fluorosulfonyl)imide solution to vacuum treatment to obtain the lithium bis(fluorosulfonyl)imide. This invention solves the problem of excessive acid content in lithium bis(fluorosulfonyl)imide products by using physical methods and a suitable reaction apparatus for acid removal.

The present invention relates to a zinc oxide varistor and a method for producing a zinc oxide varistor. This zinc oxide varistor comprises a varistor element and multiple electrodes. The varistor element contains zinc oxide as the main component and is formed of a mixture obtained by adding an oxide and lithium fluoride to zinc oxide.

The invention discloses a low-melting-point high-transference-number electrolyte material for a fluorine ion thermal battery and a preparation method thereof.The preparation method comprises the steps that lithium fluoride, sodium fluoride and potassium fluoride are mixed in proportion and subjected to first calcination treatment for 4-6 h at the temperature of 500-600 DEG C, an obtained product is rapidly cooled, and powdery ternary fluoride eutectic salt is obtained; mixing cesium fluoride with the ternary fluoride eutectic salt in proportion, performing secondary calcination heat treatment for 4-6 hours at the temperature of 600-700 DEG C, and then quickly cooling to obtain powdery quaternary fluoride eutectic salt; and mixing the quaternary fluoride eutectic salt with magnesium oxide of which the mass is 0.8-1.2 times that of the quaternary fluoride eutectic salt, carrying out third calcination treatment at 400-600 DEG C for 3-5 hours, and then rapidly cooling and crushing. By adding the high-atomic-number cation salt, the fluorine ion transference number of the fused salt is improved, the multi-element eutectic salt is obtained, the salt melting point is reduced, the working temperature range of the fluorine ion thermal battery is widened, and the specific energy of the battery is improved.

The application discloses a kind of waste lithium battery positive electrode material recycling method, it is related to lithium battery positive electrode material technical field.The application is in preparation lithium battery positive electrode material, first waste lithium iron phosphate battery is discharged and disassembled, and in cold hot water circulation immersion separation current collector, after calcination, with sulfuric acid-hydrogen peroxide selection leaching lithium ion is recovered to obtain recycled lithium carbonate;Carbonate ternary precursor is prepared by coprecipitation method;Carbonate ternary precursor, recycled lithium carbonate, silicon monoxide, lithium fluoride, neodymium oxide are mixed and secondly calcined to obtain doped modified ternary positive electrode material;Lanthanum, aluminum and zinc are coated on the surface of doped modified ternary positive electrode material by potassium-sodium alloy reduction method to obtain coated modified ternary positive electrode material;Coated modified ternary positive electrode material is mixed with conductive agent and binder, and then coated on carbon-coated aluminum foil to obtain lithium battery positive electrode material.The lithium battery positive electrode material prepared by the application has high charge-discharge specific capacity, high cycle life and good rate performance.

The application belongs to the technical field of microwave absorption, and relates to a wave-absorbing material capable of being inkjet printed and a preparation method thereof. The wave-absorbing material capable of being inkjet printed comprises MXene nanosheets, two-dimensional inorganic nanosheets, water and ethanol, wherein the mass ratio of the two-dimensional inorganic nanosheets / MXene nanosheets is 1-40%, and the volume ratio of the water / ethanol is 0.2-0.8. The preparation method of the wave-absorbing material comprises the following steps: MXene nanosheets are prepared by placing MXene precursor powder in a mixed solution of concentrated hydrochloric acid and lithium fluoride powder for etching; two-dimensional inorganic nanosheets are prepared by mixing layered oxide ceramic powder with acid solution for ion exchange and then carrying out intercalation reaction; and MXene / two-dimensional inorganic composite nanosheet ink is obtained by uniformly dispersing the two kinds of nanosheets in a water / ethanol mixed solvent. The preparation method has low cost, is simple and convenient to operate, and is environmentally friendly, and can realize large-scale production. The prepared wave-absorbing material has good stability, can be integrated on the surface of various rigid and flexible electronic devices in the form of inkjet printing, and can effectively reduce electromagnetic wave pollution.

The utility model relates to a double-sub-single-layer OLED device with different middle spacing layers. The double-sub-single-layer OLED device comprises an ITO anode, an m-MTDATA hole injection layer, a C545T light-emitting layer, an NPB hole transport layer or an Alq hole transport layer, a DCM2 light-emitting layer, an Alq electron transport layer and an aluminum and lithium fluoride composite cathode which are arranged in sequence. The C545T light-emitting layer and the DCM2 light-emitting layer are both of a sub-single-layer structure. The OLED device overcomes the defect of quenching caused by high doping concentration in the traditional process, also avoids the defect that the doping concentration is low and is difficult to control, has a simple structure, is easy and convenient to manufacture, and can be widely applied to preparation of OLED devices.

The invention provides a preparation method of lithium hexafluorophosphate with low fluorine emission, and relates to the technical field of preparation of lithium hexafluorophosphate, the preparation method comprises the following steps: by taking anhydrous lithium fluoride as a lithium source in a closed reaction kettle, adding a carbonic ester and nitrile mixed organic solvent system, and adding ammonium pentafluorophosphate or an organic complex thereof as a phosphorus-containing precursor, in-situ generation and directional reaction of the fluorine-phosphorus-containing active substance are realized by controlling the slow release rate of the precursor. The solid weakly-alkaline fluorine trapping agent is arranged in the system and can dynamically adsorb or complex generated hydrofluoric acid and other fluorine-containing byproducts, so that fluorine dissipation is reduced. The reaction process is divided into three continuous windows of low-activity pre-reaction, directional main reaction and activity stabilization by regulating and controlling the reaction temperature, the stirring rate and the solvent polarity in stages, so that controllable reaction and uniform conversion of fluorine-containing phosphorus substances are ensured. And after the reaction is finished, gradually carrying out cooling crystallization, solid-liquid separation and drying to obtain a high-purity lithium hexafluorophosphate product. Therefore, generation and emission of hydrofluoric acid are remarkably reduced.

The application provides a purification method of lithium fluoride, high-purity lithium fluoride, lithium hexafluorophosphate, an electrolyte and a device, and the purification method of the lithium fluoride comprises the following steps: performing water washing treatment on the lithium fluoride to be purified at 0-50 DEG C to obtain a mixture containing a first solid-phase product; performing ultrasonic treatment on the mixture at 20-25 kHz to obtain a second solid-phase product through filtration; performing fluorination reaction on the second solid-phase product with electronic-grade anhydrous hydrofluoric acid to obtain a third liquid-phase product; performing ion exchange on the third liquid-phase product by using a chelating resin at 0-80 DEG C, and then performing cooling evaporation crystallization, and obtaining a fourth solid-phase product through filtration; and performing cleaning treatment on the fourth solid-phase product by using inert gas at 150-250 DEG C to obtain high-purity lithium fluoride. The high-purity lithium fluoride obtained by the purification method has low content of lithium carbonate and other impurities, and is beneficial to improving the performance and stability of subsequent products.