628 results about "Lithium fluoride" patented technology

The invention relates to a method for preparing a pyrochlore oxyfluoride solid electrolyte by a one-step solid phase method, which comprises the following steps: uniformly mixing lithium carbonate (Li2CO3), lanthanum oxide (La2O3), niobium pentoxide (Nb2O5) and lithium fluoride (LiF), and carrying out high-temperature one-time sintering under protective gas to synthesize a Li2-xLa (1 + x) / 3Nb2O6F (LLNOF solid electrolyte material. The synthesis route is optimized, a single fluorine source is used, and the types of raw materials are reduced; according to the method, secondary sintering is not needed, the pure-phase electrolyte powder can be obtained by adopting one-step sintering synthesis, the steps are simple, the efficiency is high, the cost is reduced, and the resource consumption is reduced. According to the obtained LLNOF electrolyte material powder, the synthesis temperature ranges from 900 DEG C to 1100 DEG C, heating to 1100 DEG C or above is not needed, the requirement for heating equipment is low, large-scale mass production can be conducted, the sample yield is large, and energy consumption is low. Required synthesis equipment is simple and easy to obtain, and the ionic conductivity is good. The lithium ion conductor with high conductivity and stability in air is synthesized through a one-step method.

The invention provides a positive active material with a lithium fluoride layer as well as a preparation method and application of the positive active material. The positive active material comprises a high-nickel ternary positive material and the lithium fluoride layer covering the surface of the high-nickel ternary positive material, and the thickness of the lithium fluoride layer is 10-100 nm. In the positive electrode active material with the lithium fluoride layer, the surface of the high-nickel ternary positive electrode material is covered with the lithium fluoride layer, and lithium fluoride has excellent chemical stability, conductivity and lithium ion transmission rate, so that the positive electrode active material is coated with the lithium fluoride layer with the thickness of 10-100nm, thereby ensuring that the positive electrode active material has relatively good ion transmission performance; the internal strain and phase change of the high-nickel ternary positive electrode material are inhibited, and the risk that the high-nickel ternary positive electrode material generates cracks is reduced; the interface performance is improved, and the active material is isolated from the electrolyte, so that the risk of side reaction between the high-nickel ternary positive electrode material and the electrolyte is reduced, and the high-nickel ternary positive electrode material is prevented from being dissolved and delithiated.

The invention provides a modified lithium metal negative electrode and a preparation method and application thereof, and belongs to the technical field of lithium batteries. The modified lithium metal negative electrode comprises a negative electrode conductive substrate and an interface passivation layer formed on the surface of the negative electrode conductive substrate, and the interface passivation layer comprises lithium oxide, lithium sulfide, lithium nitride, lithium fluoride and a fluorocarbon compound; the interface passivation layer is obtained by putting lithium metal into chloroform for dipping treatment to obtain modified lithium metal and then performing plasma treatment. According to the lithium ion battery, the interface passivation film containing the lithium oxide, the lithium sulfide, the lithium nitride, the lithium fluoride and the fluorocarbon is formed on the negative electrode conductive substrate, and in the repeated charging and discharging process of the lithium ion battery, due to the existence of the interface passivation film, non-uniform deposition of lithium ions can be avoided, so that growth of lithium dendrites is inhibited. Furthermore, the coulombic efficiency and the cycling stability of the charge-discharge cycle of the lithium ion battery can be improved, and the service life of the lithium ion battery is prolonged.

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 discloses a method for recycling a waste lithium battery positive electrode material, and relates to the technical field of lithium battery positive electrode materials. When the lithium battery positive electrode material is prepared, the waste lithium iron phosphate battery is discharged and then disassembled, a current collector is separated through cyclic soaking in cold and hot water, lithium ions are selectively leached through sulfuric acid-hydrogen peroxide after calcination, and the recycled lithium carbonate is obtained through recycling; preparing a carbonic acid ternary precursor by using a coprecipitation method; mixing the carbonic acid ternary precursor, recycled lithium carbonate, silicon monoxide, lithium fluoride and neodymium oxide, and performing secondary calcination to obtain a doped modified ternary positive electrode material; compounding and coating lanthanum, aluminum and zinc on the surface of the doped modified ternary positive electrode material by using a potassium-sodium alloy reduction method to prepare a coated modified ternary positive electrode material; and mixing the coated modified ternary positive electrode material with a conductive agent and a binder, and coating a carbon-coated aluminum foil with the mixture to prepare the lithium battery positive electrode material. The lithium battery positive electrode material prepared by the invention has high charge-discharge specific capacity, long cycle life and good rate capability.

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.

The invention provides a preparation method of a high-rate and high-sphericity lithium iron phosphate positive electrode material, which comprises the following steps: weighing iron phosphate and a lithium source according to a certain proportion, dispersing in pure water, and mixing and sanding to obtain slurry A; under a stirring condition, adding a small amount of fluorine source into the slurry A to obtain lithium fluoride doped slurry B; and under the stirring condition, adding an organic carbon source into the slurry B to prepare an electrostatic spinning solution C, and drying and calcining at high temperature to obtain the high-rate and high-sphericity lithium iron phosphate composite positive electrode material. The preparation method comprises the following steps: synthesizing a lithium fluoride doped stock solution through an in-situ reaction of a fluorine source and a lithium source, and preparing a uniformly doped precursor through electrostatic spinning; the generated lithium fluoride is used as a fluxing agent to promote the formation of high-sphericity lithium iron phosphate in the sintering process; and meanwhile, the doping of fluorine ions weakens the interaction between Li and O, so that the lithium ions can be separated / embedded in a bulk phase during charging and discharging, and the conductive carbon layer is rich in lithium fluoride, so that the migration efficiency of the lithium ions at a positive electrode / electrolyte interface is improved.

The invention discloses a preparation method and application of a safe electrolyte, and belongs to the technical field of electrolytes.The preparation method comprises the steps that a carbonic ester solvent, imidazolyl ionic liquid, a lithium salt and a composite additive are dried and dewatered, the carbonic ester solvent and the imidazolyl ionic liquid are prepared into an electrolyte organic solvent in a water-free and oxygen-free glove box, and the electrolyte organic solvent is added into a lithium ion battery; adding the lithium salt and the composite additive into the electrolyte organic solvent, and uniformly mixing to obtain the safe electrolyte; the safe electrolyte keeps the liquid-state high ionic conductivity characteristic in a normal working temperature interval, liquid-solid phase change is rapidly generated when the temperature of the battery rises to a critical threshold value, a three-dimensional net-shaped solid-state barrier layer is formed, a lithium ion transmission path is cut off so as to restrain the hot chain reaction, meanwhile, lithium fluoride salt with dynamic coordination capacity is introduced into the safe electrolyte system, and therefore the safety performance of the lithium ion battery is improved. A stable oxidation-reduction potential window is maintained in the phase change process, the integrity of electrical performance after high-temperature phase change is ensured, the electrolyte reversibly recovers to be in a liquid state after cooling, and the performance of the battery is basically not attenuated.

The invention provides lithium fluoride as well as a preparation method and application thereof. The mass content of carbonate in the lithium fluoride is less than or equal to 1000mg / kg; d10 of the lithium fluoride is smaller than or equal to 10 microns, D50 of the lithium fluoride is smaller than or equal to 20 microns, and the bulk density of the lithium fluoride is 0.9-1.2 g / cm < 3 >. The lithium fluoride provided by the invention has a specific size specification and relatively low carbonate impurity content, and the lithium fluoride is beneficial to preparation of electrolyte salt capable of improving the electrical performance of a battery.

The invention is applied to the technical field of lithium ion batteries, and discloses a non-aqueous electrolyte which comprises the following substances in percentage by weight: 5-20% of electrolyte lithium salt, 70-90% of organic solvent and 2-9% of functional additive, and the functional additive comprises fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene. Compared with classical ethyoxyl pentafluorocyclotriphosphazene, the fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene has the advantages that sulfonyl and ester groups are added, a correspondingly formed positive electrode electrolyte interface layer (CEI) rich in inorganic lithium salts such as lithium sulfate and lithium fluoride can stabilize an interface between a positive electrode and an electrolyte under high voltage, impedance rise is inhibited, and the service life of the positive electrode is prolonged. And stable circulation of 5V spinel is realized. By introducing the ester group, the lithium salt solubility of the electrolyte can be improved, the solution viscosity can be reduced, the wetting ability can be improved, and meanwhile, the electrolyte has a good flame-retardant effect. Compared with a control group, the battery containing the fluorine sulfonyl difluoroacetate pentafluorocyclotriphosphazene additive electrolyte has better electrochemical performance.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and an electrochemical device, the preparation method comprises the following steps: mixing a phosphorus source, an iron source, a lithium source, a first carbon source, lithium fluoride, a first additive and a solvent to form a primary mixed material, and carrying out primary sintering to obtain a matrix material, the mass percentage M of the lithium fluoride accounting for the total mass of the iron source and the phosphorus source being 0-0.1%; the matrix material, a second carbon source, lithium fluoride, a second additive and a solvent are mixed to form a secondary mixed material, the mass percent N of the lithium fluoride added in the step in the total mass of the iron source and the phosphorus source is 0-0.3%, and N and M are not 0 at the same time; and grinding the secondary mixed material to obtain a secondary mixed material A and a secondary mixed material B with different particle sizes, and carrying out mixing and secondary sintering to obtain the lithium iron phosphate positive electrode material with good compaction density, rate capability and low-temperature performance.

The invention belongs to the technical field of hybrid supercapacitors, and discloses a coal-based hard carbon negative electrode material with high slope lithium storage capacity and a preparation method and application of the coal-based hard carbon negative electrode material. Washing the pulverized coal subjected to impurity removal with ultrapure water until the pH value is neutral, and then drying; pre-oxidizing the pulverized coal in an air atmosphere at 280-320 DEG C for 110-130 minutes, switching a gas atmosphere into a protective atmosphere after the pre-oxidation is finished, continuously heating, carbonizing at 1180-1220 DEG C for 110-130 minutes, washing with an acid solution to be neutral after the carbonization is finished, and drying to obtain a carbon material subjected to heat treatment; impregnating the surface of the carbon material subjected to heat treatment with lithium fluoride; and carrying out heat treatment on the material A at 280-320 DEG C in a protective atmosphere for 280-320 minutes to obtain the coal-based hard carbon negative electrode material with high slope lithium storage capacity. The power and capacity performance of the hybrid super capacitor can be improved, the intrinsic safety of the device can be further improved, and the hybrid super capacitor has great practical significance.

The invention relates to the technical field of ultraviolet shielding materials, in particular to a preparation method of an MXene / lignin two-dimensional nanosheet composite material and application of the MXene / lignin two-dimensional nanosheet composite material in ultraviolet shielding. The preparation method comprises the following steps: performing vacuum freeze drying on a lignin deionized water dispersion liquid to obtain flake lignin, dissolving Ti3AlC2MAX powder into a lithium fluoride and concentrated hydrochloric acid solution to obtain etched MXene, dispersing the etched MXene and the flake lignin into an ammonia water solution, mixing, and performing ball milling to obtain a modified MXene solution; and separating solids from the obtained suspension, washing to be neutral, and freeze-drying to obtain the MXene / lignin composite nanosheet composite material. The lignin nanosheets are intercalated in the lamellar structure of MXene, on one hand, the agglomeration phenomenon among the lignin nanosheets is avoided, and on the other hand, the phenomenon that part of MXene is not stripped and layered is solved, so that the MXene forms a uniform nanosheet structure, and the whole MXene shows good ultraviolet shielding capability and oxidation resistance.

The invention discloses a tannic acid modified titanium carbide / silver nanowire / aramid nanofiber electromagnetic shielding composite film and a preparation method and application thereof.The preparation method comprises the steps that titanium aluminum carbide powder is added into a mixed solution of lithium fluoride and hydrochloric acid, stirring reaction is performed, ultrasonic treatment is performed to prepare an MXene aqueous dispersion, tannic acid is added into the MXene aqueous dispersion, stirring reaction is performed, and the tannic acid modified titanium carbide / silver nanowire / aramid nanofiber electromagnetic shielding composite film is obtained. Stirring and reacting at room temperature to prepare an MXene-TA dispersion liquid; the preparation method comprises the following steps: dissolving potassium hydroxide and para-aramid chopped fibers in dimethyl sulfoxide, and stirring to obtain an aramid nanofiber dispersion liquid; and the tannic acid modified titanium carbide / silver nanowire composite electromagnetic shielding composite film is prepared from the MXene-TA dispersion liquid, the AgNWs dispersion liquid and the aramid nanofiber. The electromagnetic shielding composite film prepared through the method is not prone to oxidation and good in mechanical performance, and the use stability of an electromagnetic shielding material is effectively improved.

The present invention provides a synthesis system and a synthesis method for lithium hexafluorophosphate. The synthesis system comprises a gas-liquid reaction kettle and a built-in microbubble generation unit provided in the gas-liquid reaction kettle; a material inlet and a gas inlet are formed in the side wall of the gas-liquid reaction kettle; the built-in microbubble generation unit comprises a first microbubble generator and a second microbubble generator, the first microbubble generator is provided below the liquid level in the gas-liquid reaction kettle and connected to the material inlet, and the second microbubble generator is provided at the bottom end of the gas-liquid reaction kettle and connected to the gas inlet; a plurality of layers of perforated plates are successively provided in the gas-liquid reaction kettle from top to bottom; through holes of said perforated plates are staggered, and said perforated plates are provided between the first microbubble generator and the second microbubble generator. The synthesis system of the present invention increases the area of mass transfer between lithium fluoride liquid and phosphorus pentafluoride gas, increases the reaction rate, and reduces energy consumption.

The invention belongs to the technical field of regeneration of waste storage battery positive electrode materials, and particularly relates to a regeneration method of waste lithium iron phosphate and regenerated lithium iron phosphate. The regeneration method of the waste lithium iron phosphate provided by the invention comprises the following steps: mixing a waste lithium iron phosphate positive electrode material containing PVDF, an alkaline lithium source, an iron source and an accelerant, and then sequentially carrying out two stages of calcination treatment in a non-oxidizing atmosphere: in the first stage of calcination treatment, enabling the accelerant to promote the combination of iron and fluorine to generate iron trifluoride; second-stage calcination treatment is carried out to complete carbonization and lithium supplementation of PVDF; the accelerant is ammonium salt. According to the present invention, the reaction between the fluorine generated by PVDF pyrolysis and the iron source is promoted by using the accelerator to generate iron trifluoride so as to inhibit the generation of lithium fluoride, such that the iron trifluoride doping modification is achieved, the hydrocarbon component generated by PVDF pyrolysis is carbonized to form the carbon layer so as to improve the conductivity, and the obtained regenerated lithium iron phosphate has excellent specific capacity and excellent cycle performance.

The embodiment of the invention provides a solid electrolyte and a preparation method and application thereof, and relates to the technical field of battery materials. The solid electrolyte comprises a halide electrolyte and a composite coating layer arranged on the surface of the halide electrolyte, wherein the composite coating layer comprises lithium fluoride and aluminum oxide in a mass ratio of (1-9): (9-1). The solid electrolyte has excellent ionic conductivity, oxidation potential and air stability, and is beneficial to realizing high-rate charge-discharge performance of the battery.

The invention provides a solid electrolyte and application thereof, and the solid electrolyte at least comprises: a core body comprising a sulfide electrolyte; the surface of the core body is coated with the shell layer, and the shell layer comprises lithium iodide and lithium fluoride. According to the solid electrolyte and the application thereof provided by the invention, the stability of the solid electrolyte to air and positive and negative electrodes can be improved, so that the cycle life and the stability of a battery are improved.

The invention relates to the technical field of lithium / sodium ion battery negative electrode materials, in particular to a phosphorus-based negative electrode material with a solid electrolyte interface and a preparation method and application thereof.The method comprises the following steps that phosphorus powder, a carbon material and metal fluoride are mixed and subjected to ball milling, and a composite negative electrode material is obtained; and sieving the composite negative electrode material to obtain the phosphorus-based negative electrode material. The solid electrolyte interface with high strength and high lithium ion / electron transmission is constructed in situ by doping the metal fluoride, so that the cycling stability and the rate capability of the battery are improved. When the lithium ion battery is discharged, the fluorinated metal can construct a solid electrolyte interface rich in lithium fluoride with high Young modulus and lithium-metal alloy with high ion / electron conductivity on the surfaces of phosphorus-carbon particles in situ before phosphorus-carbon lithium embedding, and the strength of the solid electrolyte interface can be enhanced by means of the lithium fluoride with high Young modulus; the expansion of the phosphorus-carbon negative electrode is inhibited, so that the cycling stability is improved.

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 relates to the technical field of electrolyte membrane preparation, in particular to a solid electrolyte membrane and a preparation method and application thereof. The solid electrolyte membrane is prepared from the following components in parts by weight: 45 parts of CD-PEO-SN, 15 parts of Li-MOF-SO4, 10 parts of lithium sulfide, 10 parts of lithium fluoride, 5 parts of silicon dioxide, 10 parts of JIC ionic liquid and 5 parts of ppy-NG. The conductivity of the solid electrolyte membrane provided by the invention is 1.8 * 10 <-4 > S / cm; the mechanical strength is 18MPa; the cycle life: the capacity retention rate gt after 1000 times of cycle at 1C; 92%; the process controllability is as follows: the components are uniformly dispersed; and the interface impedance is 75 omega.cm < 2 >.

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a battery capable of supplementing lithium or sodium in situ, which comprises a positive plate, a negative plate and an electrolyte, and is characterized in that the electrolyte contains a component A, and a positive electrode and / or a negative electrode contains a component B; the structural general formula of the component A is X-Y, and X is lithium fluorosulfonate, sodium fluorosulfonate, lithium difluorophosphate or sodium difluorophosphate; y is boron trifluoride or phosphorus pentafluoride; the component B is at least one of lithium oxalate, sodium oxalate, lithium fluoride and sodium fluoride. Compared with the prior art, the component A and the component B are simultaneously added into the battery disclosed by the invention, so that the battery shows more excellent cycle performance and high-temperature performance. The combination mode has better performance compared with the mode that the component B is independently used in the electrode material or the component A is independently used in the electrolyte.

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 invention relates to a negative electrode material and a preparation method thereof, and a lithium ion battery, the negative electrode material comprises a carbon matrix and an active substance, the carbon matrix has pores, and at least part of the active substance is distributed in the pores of the carbon matrix. The carbon dioxide in the pores of the carbon matrix in the negative electrode material can be quickly dissolved in the electrolyte and promote the electrolyte to enter the pores of the negative electrode material, and meanwhile, in the lithium intercalation process, the dissolved carbon dioxide can reduce the decomposition rate of FEC and reduce the formation of a loose and irregular SEI film, so that the lithium intercalation efficiency is improved. And the binding effect of fluorine in the lithium fluoride SEI film and lithium in the lithium silicon alloy is improved, so that the capacity and the first effect of the negative electrode material are improved.

The invention relates to a secondary battery and an electric device. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the negative pole piece comprises a negative active material layer and a solid electrolyte interface film formed on the surface of the negative active material layer, and the solid electrolyte interface film comprises lithium fluoride, fluorine-containing lithium phosphate and a substance containing a fluorocarbon bond; an X-ray photoelectron spectrometer is adopted for testing after the sputtering etching time is 10 minutes, based on the total substance amount of fluorine atoms in a solid electrolyte interfacial film, the molar content of fluorine atoms in lithium fluoride is a, the molar content of fluorine atoms in fluorine-containing lithium phosphate is b, the molar content of fluorine atoms in a substance containing fluorocarbon bonds is c, a + b is larger than or equal to 85% and smaller than or equal to 100%, and c is larger than or equal to 0 and smaller than or equal to 15%; in addition, the negative electrode active material layer further comprises a binder, and the binder comprises polytetrafluoroethylene. The secondary battery of the present application can improve the first efficiency and cycle life.

The invention relates to the technical field of silica powder surface modification, in particular to a novel silica powder surface modification method and application of a composite material of the novel silica powder surface modification method. Silica powder surface modification comprises the steps that silica powder is subjected to surface chemical modification through a titanate coupling agent, active functional groups are introduced, and the interface bonding force between the silica powder and MXene is enhanced; high-quality preparation of MXene: etching an MAX phase by adopting hydrofluoric acid (HF) or lithium fluoride / hydrochloric acid (LiF / HCl), and obtaining few layers of MXene nanosheets through ultrasonic stripping to ensure high conductivity and large specific surface area; the modified silica powder and MXene dispersion liquid are uniformly mixed, MXene stacking is inhibited, the specific surface area is increased, and the ion transmission efficiency is improved; mXene nanosheets grow on the surface of the silica powder in situ to form a core-shell structure, so that the interface bonding strength and the mechanical property are enhanced; the composite material is applied to the fields of electromagnetic shielding, energy storage, flexible electronics and the like.

The invention discloses a lithium ferric fluorosulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises lithium ferric fluorosulfate and a carbon nanotube coated on the lithium ferric fluorosulfate, the positive electrode material is a secondary particle, and the particle size of the secondary particle is 2-10 [mu] m; the secondary particles are composed of nanoscale primary particles; and the particle size of the primary particles is 20-200 nm. The preparation method comprises the following steps: 1) grinding lithium fluoride until the particle size is below 10 microns; 2) carrying out ball-milling mixing on the ground lithium fluoride, ferrous sulfate and carbon nanotubes to obtain a mixture; and 3) roasting the mixture to obtain the lithium ferric fluorosulfate positive electrode material. The positive electrode material has better electronic conductivity and ionic conductivity, higher specific capacity and more excellent cycle performance, and is excellent in high-temperature performance and low-temperature performance.

Described herein is a composite comprising a fluorinated polymer and nanoparticles of lithium fluoride. The lithium fluoride has an average BET surface area of at least 10 m2 / g. The fluorinated polymer includes a fluorinated polymer backbone chain and a plurality of groups represented by formula —SO2X, in which each X is independently —NZH, —NZSO2(CF2)1-6SO2X′, —NZ[SO2(CF2)dSO2NZ]1-10SO2(CF2)dSO2X′, or —OZ, and Z is independently a hydrogen, an alkali-metal cation, or a quaternary ammonium cation, X′ is independently —NZH or —OZ, and each d is independently 1 to 6. A polymer electrolyte membrane, an electrode, and a membrane electrode assembly including the composite are also provided.

The present invention discloses a continuous production process of liquid lithium hexafluorophosphate, and relates to the technical field of lithium ion battery electrolyte. The whole process of this process is carried out under nitrogen sealing conditions. After liquid anhydrous hydrogen fluoride and liquid chlorine are introduced into a microchannel mixer for mixing, they are introduced into a primary tubular reactor together with phosphorus trichloride liquid for reaction, and the generated gas is introduced into a gas-liquid separator and a condenser to obtain phosphorus pentafluoride gas, which is continuously introduced into a secondary tubular reactor to react with a lithium fluoride solution to generate an unsaturated solution of lithium hexafluorophosphate; the generated lithium hexafluorophosphate solution is adsorbed by a trifluoromethyl hydrogen type macroporous cationic resin, the trifluoromethyl hydrogen type macroporous cationic resin is filtered to remove, the filtrate is crystallized and dried, and the dried lithium hexafluorophosphate crystals are prepared as liquid lithium hexafluorophosphate. This process realizes the continuous production of liquid lithium hexafluorophosphate, improves the safety in the production process, effectively improves the product quality, and meets policy requirements.

The invention relates to the technical field of electroluminescent devices, in particular to a large-current quantum dot electroluminescent device and a preparation method thereof. The device comprises a substrate, a cathode, an electron transport layer, a quantum dot light-emitting layer, a current focusing layer, a hole transport layer, a hole generation layer and an anode which are tightly stacked in sequence, the current focusing layer is provided with a slit which is used for regulating and controlling the injection path of hole current to the quantum dot light-emitting layer and improving the bearable current density threshold value of the device. The material of the current focusing layer is one or more of lithium fluoride, magnesium fluoride and aluminum oxide; and the hole generation layer is used for efficiently enhancing hole injection. The invention further provides a preparation method for preparing each layered structure through spin coating and vacuum evaporation deposition. The electroluminescent device has the advantages that the hole generation layer and the current aggregation layer are utilized to construct the electroluminescent device capable of realizing large-current driving, the problem that carrier injection in the device under large-current driving is limited is solved, and the current tolerance and the luminous intensity of the device are effectively improved.