263results about "Lithium compounds" patented technology

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The invention discloses a preparation method of a sulfide solid electrolyte, and relates to the field of solid-state batteries, the preparation method comprises the following steps: preparing Li2S-coated LiCl core-shell nanoparticles, and carrying out airflow collision grinding on the Li2S-coated LiCl core-shell nanoparticles and P2S5 nanopowder to obtain composite powder; the composite powder is placed in a reaction furnace for heating deposition, then heating crystallization is carried out, and Li6PS5Cl nanoparticles are obtained; the Li6PS5Cl nanoparticles are placed in a ball milling tank to be treated, then annealing treatment is conducted, and the sulfide solid electrolyte is obtained after treatment is completed. Through combination of the core-shell structure precursor and the vapor deposition technology, the core contradiction that nanocrystallization and high ionic conductivity are difficult to consider at the same time in the sulfide solid electrolyte field is effectively solved, and the problems of interface contact defects caused by micron-sized particles and crystal defects caused by mechanical refinement in a traditional process are effectively solved; the problem is solved through construction of Li2S-coated LiCl core-shell nanoparticles and activation treatment of airflow on collision and grinding.

The invention provides a sulfide electrolyte material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing lithium sulfide, phosphorus pentasulfide, rare earth sulfide and a solvent, and reacting to obtain a sulfide electrolyte precursor; and carrying out pressing treatment on the sulfide electrolyte precursor, and carrying out low-temperature sintering on the material obtained by pressing at 250-500 DEG C to obtain the sulfide electrolyte material. According to the method disclosed by the invention, the synthesis of the rare earth element doped sulfide precursor is realized by adopting a pure liquid phase method, particles are dispersed in a liquid phase solvent, and the particle uniformity and dispersity of the obtained finished product are obviously superior to those of a solid phase method. After the precursor obtained by the liquid phase method is pressed and sintered at low temperature, the crystal boundary between crystals of the electrolyte material is relatively small, the energy barrier of ion transmission is remarkably enhanced, the conductivity of the electrolyte is optimized, and the long-cycle stability of the all-solid-state battery is improved.

The invention discloses a synthesis method of lithium phosphorus sulfur chloride, and relates to the technical field of preparation of sulfide solid electrolyte for all-solid-state lithium ion batteries, and the scheme is as follows: the synthesis method of lithium phosphorus sulfur chloride comprises the following steps: pretreatment of raw materials: mixing lithium carbonate (Li2CO3), phosphorus pentasulfide (P2S5), lithium chloride (LiCl) and elemental sulfur (S) according to a preset ratio, and then adding a catalyst, grinding and dispersing for a preset time to obtain uniformly dispersed mixed powder; reduction reaction: fully mixing the mixed powder with a reducing agent, heating to a first preset temperature condition, and carrying out reduction reaction to obtain a reduction product; sintering and purifying: heating the reduction product to a second preset temperature, and sintering to form a lithium phosphorus sulfur chloride (Li6PS5Cl) crystal phase to obtain a lithium phosphorus sulfur chloride (Li6PS5Cl) product; the raw material cost can be remarkably reduced, the process safety and economy are optimized, and large-scale industrial preparation of lithium phosphorus sulfur chlorine is realized.

A solid electrolyte contains Li, M, Si, and F, where M is an element serving as a cation. It is preferable that M may be an element serving as a trivalent cation and that the solid electrolyte may contain a component expressed by a composition formula of LiaMbSicFd, the composition formula satisfying 0.9(3-x) ≤ a ≤ 1.1(3-x), 0.9(1-x) ≤ b ≤ 1.1(1-x), 0.9x ≤ c ≤ 1.1x, 5.4 ≤ d ≤ 6.6, and 0 < x < 1.

The invention discloses an ordered ion channel polyamide nano composite membrane, a preparation method and application, relates to the field of lithium magnesium membrane separation, and aims to solve the problem of poor selectivity in the prior art. The technical scheme is as follows: amino benzo crown ether is covalently grafted on an ultrafiltration base membrane in situ through diazotization-coupling reaction; then, a polyamide compact layer is prepared on the crown ether nano layer subjected to in-situ self-assembly through interfacial polymerization, and the polyamide nano composite membrane with the ordered ion transmission channel is jointly constructed. The residual amino groups on the surface of the in-situ covalent grafted crown ether nano layer can also participate in interfacial polymerization reaction, so that the ordered ion channel crown ether macromolecular layer and the polyamide compact layer are connected through chemical bonds to jointly form the polyamide nano composite membrane with the ordered ion transmission channel. And the method is suitable for extracting lithium from the salt lake brine.

Provided is a method for producing a sulfide solid electrolyte, the method comprising mixing a starting material-containing substance containing a lithium atom, a phosphorus atom, a sulfur atom and a halogen atom in an organic solvent to produce a mixture and subjecting the mixture to irradiation with microwaves. Thus, a method for producing a sulfide solid electrolyte is provided, in which a heating temperature is decreased by employing a liquid phase method to suppress the granulation by heating and therefore a sulfide solid electrolyte that keeps the particle diameters thereof can be efficiently produced.

The invention relates to the technical field of chemical machinery, in particular to automatic filtering and drying equipment and method.The automatic filtering and drying equipment comprises a rotary cylinder capable of working in multiple postures, double-layer sleeve fluid conveying assemblies are arranged at the two ends of the cylinder respectively, one end assembly is specially used for liquid phase conveying, central pipe liquid feeding and interlayer liquid discharging, and the other end assembly is specially used for gas / solid phase conveying; the central pipe discharges solid and the interlayer exhausts air, so that thorough isolation of a high-risk liquid phase and a gas / solid phase pipeline is realized on a physical structure, a follow-up heating and control system, an airflow conveying and discharging mechanism and a built-in crushing mechanism are integrated, and full-process automatic closed operation of inverted filtering, rotary drying and upright discharging is realized. The problems of liquid crystallization blockage, sealing failure leakage, danger of manual operation and the like caused by mixed use of pipelines of traditional equipment are fundamentally solved, and the device is particularly suitable for safe and efficient production of lithium hexafluorophosphate and other materials which are high in toxicity, high in corrosion, flammable and explosive, easy to deliquesce and cannot be in contact with air.

The disclosure provides a method for recycling waste cathode by soluble calcium salt. The method for recycling waste cathode by soluble calcium salt comprises the following steps: S1, screening waste cathode; S2, mixing soluble calcium salt with water to prepare first slurry; S3, mixing first powder and the first slurry, and performing flotation under the assistance of ultrasonic, separating upper flotation foam, and then filtering to obtain first filtrate and first filter residue; S4, performing acid leaching on the first filter residue, and filtering to obtain second filtrate and second filter residue, wherein the second filter residue is calcium fluoride; S5, evaporating the second filtrate to obtain aluminum salt; and S6, evaporating and drying the first filtrate to obtain an alkali mainly containing sodium hydroxide.

The application relates to a lithium sulfide preparation method, lithium thiophosphate and a sulfide solid electrolyte, and the preparation method comprises the following steps: providing a first raw material containing liquid diphosphorus pentasulfide and / or liquid sulfur and a second raw material containing lithium elements; wherein the second raw material containing lithium elements comprises lithium sulfide powder or liquid lithium; the first raw material and the second raw material are contacted and reacted in a reactor under an inert gas atmosphere; and the reaction temperature is 280-500 DEG C. By contacting and reacting liquid diphosphorus pentasulfide with the second raw material containing lithium elements at a lower temperature, the problems of low purity caused by the grinding process are avoided, high-purity lithium sulfide with controllable particle size can be quickly, continuously and large-scaledly produced, and the production cost is reduced.

A reactant generation system for a continuous production lithium sulfide fluidised bed reactor is disclosed which comprises a hydrogen generator in fluid communication with a natural gas source and a

This invention discloses a method for preparing a low-acidity lithium hexafluorophosphate solution and its production apparatus. The preparation method includes: (1) adding lithium fluoride solid to a first shear reactor and a second shear reactor, and starting the shear reactor; (2) introducing phosphorus pentafluoride-containing raw material gas sequentially into the first and second shear reactors, so that it reacts with the lithium fluoride solid therein in a fluidized state to generate lithium hexafluorophosphate; the mixed gas exiting the second shear reactor is compressed and pressurized and then returned to the first and second shear reactors for recycling reaction; (3) after the reaction is completed, the residual gas in the first and second shear reactors is removed, and the crude lithium hexafluorophosphate enters the third reactor, is dissolved in a carbonate solvent, and then filtered to obtain a lithium hexafluorophosphate solution. This invention has low raw material cost, simple preparation process, safe and controllable reaction, high phosphorus pentafluoride utilization rate, and the prepared lithium hexafluorophosphate solution has an acidity ≤20ppm, which can be directly used for electrolyte preparation.

The application discloses a kind of synthesis device and method of liquid lithium hexafluorophosphate, belong to the technical field of electrolyte, the synthesis device of liquid lithium hexafluorophosphate provided by the present application includes hexafluorophosphate synthesis kettle, filter drying kettle, decomposition device, compressor, condenser, phosphorus pentafluoride gas buffer tank, rectifying tower and target product synthesis kettle.The application significantly improves the yield of hexafluorophosphate (sodium, lithium, potassium, calcium, magnesium) powder through hexafluorophosphate synthesis kettle, the application improves the purity of phosphorus pentafluoride gas through decomposition device, compressor, condenser, rectifying tower, the application improves the efficiency and product quality of producing liquid lithium hexafluorophosphate through target product synthesis kettle.

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.

This invention relates to the field of lithium-ion battery recycling technology, specifically to a method for selectively extracting lithium from waste lithium iron phosphate cathode materials using microdroplets. The method includes the following steps: S1, pretreating the waste lithium iron phosphate cathode material to obtain waste lithium iron phosphate powder, then mixing the waste lithium iron phosphate powder with an organic phase and water to form a mixture; S2, subjecting the mixture to ultrasonic treatment to disperse it into micron-sized water-in-oil microdroplets, followed by solid-liquid separation to obtain a lithium-containing aqueous phase and FePO4 solid precipitate. The method of this invention requires no external acid, alkali, or other chemical reagents, using only water and a recyclable organic solvent as the medium, relying on ultrasonic energy to drive the reaction, and produces no secondary pollution.

The invention provides a supramolecular ion separation membrane with an asymmetric functionalized nano-channel structure as well as a preparation method and application thereof, and relates to the field of separation membranes. The preparation method of the supramolecular ion separation membrane comprises the following steps: flatly attaching a covalent organic framework ion separation membrane to a polyacrylonitrile substrate to obtain a composite membrane; the membrane is installed in an H-shaped reactor, and only one side of the membrane is exposed in a reaction solution environment; the preparation method comprises the following steps: dissolving 1, 3-propane sultone in an organic solvent to obtain a sultone solution; injecting the sultone solution into a reaction chamber, close to the surface of a membrane, in an H-type reactor, so that the sultone solution and the-NH-active sites exposed on the surface of the membrane are subjected to a ring-opening reaction; after the reaction is completed, washing the obtained membrane sample with methanol and water; and drying to obtain the target supramolecular ion separation membrane. The membrane material provided by the invention is good in performance, can still maintain stable ion screening performance in a high-salt environment, can be applied to water treatment, and has a good industrial application prospect.

A coated active material 130 of the present disclosure includes: an active material 110; and a coating layer 111 including a first solid electrolyte, the coating layer 111 coating at least a portion of a surface of the active material 110. The first solid electrolyte includes Li, Ti, M, and F, the M is at least one selected from the group consisting of Ca, Mg, Al, Y, and Zr, and a proportion of a TiF bond in a group of bonds to the Ti included in the first solid electrolyte is more than 2%.

A sulfide solid electrolyte, a method of preparing the same, and an application are provided. A molecular formula of the sulfide solid electrolyte is LifP1-gEgSwOgQz, where, 5<f<10, 0<g<1, 3<w<6, 4<w+g<6, 0<z<2, E is selected from one or more of Mg, Ca, Sr, Ba, Zn, Cr, Sn, or Pb, and Q is selected from one or more of Cl, Br, or I. Through the sulfide solid electrolyte, the method of preparing the same, and the application provided by the disclosure, the stability of ionic conductivity of the sulfide solid electrolyte is increased, the air stability is enhanced, and the electrolyte / active material interface properties are improved, so that the service life and safety of an all-solid-state lithium-ion battery are increased.

The application belongs to the field of lithium hexafluorophosphate production, in particular to a vacuum reaction furnace for lithium hexafluorophosphate production, which comprises a horizontal vacuum furnace, the inside of the horizontal vacuum furnace is provided with a rotatable inner stirring frame, the inner stirring frame is attached to the inner wall of the horizontal vacuum furnace, and a feeding door for feeding and discharging is installed on the top of the horizontal vacuum furnace. Through such a setting, an integrated preparation process of lithium hexafluorophosphate synthesis and purification reaction is realized, air and moisture pollution caused by raw material transfer during the synthesis and purification reaction process is eliminated, the post-processing process is increased, the quality is reduced, and other problems are solved. At the same time, the switchable negative pressure absorption system makes the treatment of the purification and synthesis stages adapt smoothly, realizes the possibility of common operation, reduces the transfer, post-processing and other process steps, and improves the production efficiency.

The present invention relates in a first aspect to a battery, typically a secondary cell battery which can be recharged, in a second aspect to a an improved electrolyte for such a solid-state battery, that is, a medium that comprises ions and that is charge conducting through the movement of those ions, rather than conducting through electrons, such as in the battery, in a third aspect to a method of producing such a solid crystalline electrolyte, and in a fourth aspect to a product obtained by said method. The present invention provides and improved battery performance.

This invention relates to a crystallization apparatus for preparing lithium hexafluorophosphate, comprising: a tank body, a feeding device provided on the top surface of the tank body, and an array of heat exchange components provided on the inner wall of the tank body. The heat exchange components include several heat exchange plates disposed on the inner wall of the tank body and arranged along the length of the tank body. This apparatus can increase the heat exchange area and enhance the heat exchange efficiency, enabling the uniform and rapid precipitation of lithium hexafluorophosphate crystals, and achieving continuous production with simultaneous crystallization and scale prevention.

The present invention relates to a solid electrolyte having a composition represented by chemical formula 1 below, a method for preparing same, and an all-solid state battery comprising same. [Chemical formula 1] Li11-(5a+3b+c+2x)PaGabS5-(c+x)X(1+c), where X is one or more selected from F, Cl, Br, and I, and 5.0<5a+3b+c+2x<6.0, 0<b≤0.5, 0≤c<0.7, 0<c+x<1, 1≤a+b≤1.5.

The utility model belongs to the technical field of lithium hexafluorophosphate production, and discloses a lithium hexafluorophosphate continuous production device which comprises a reactor, a mixer, a first container, a second container, a product receiving tank and a circulating assembly, and the mixer is arranged at the input end of the reactor; the first container and the second container are connected with the input end of the reactor; the input end of the product receiving tank is connected with the output end of the reactor; the circulating assembly comprises a condenser and a circulating pump, the condenser is communicated with the interior of the reactor and connected with the circulating pump, and the output end of the circulating pump is connected with the mixer. Thus, the condenser can cool the mixed material in the reactor so as to control the reaction rate and the reaction temperature, and the circulating pump can convey the cooled material into the mixer again for continuous reaction, so that continuous production of lithium hexafluorophosphate is realized, and the production efficiency is improved.

A solid electrolyte according to one aspect of the present invention contains a lithium element, a phosphorus element, a sulfur element, a halogen element, and an aluminum element, has a crystal structure, and satisfies both of the following formulas (a1) and (b1) or both of the following formulas (a2) and (b2). 2.89<Li / P−X / P≤3.15 0.01≤Al / P≤0.10 2.84<Li / P−X / P≤2.89 0.02≤Al / P≤0.10 In the formulas (a1), (b1), (a2), and (b2), [Li / P] is a molar ratio of the content of the lithium element to the content of the phosphorus element, [X / P] is a molar ratio of the content of the halogen element to the content of the phosphorus element, and [Al / P] is a molar ratio of the content of the aluminum element to the content of the phosphorus element.

The present invention relates to a sulfide solid electrolyte used for a lithium ion secondary battery, containing an argyrodite type crystal phase that contains Li, P, S, and Ha, where [Ha] / [P] (atomic ratio) is 1.3 or greater, and in a 35Cl-NMR spectrum measured under specific conditions, SB / SA using an area intensity SA of a peak observed at 0 to 30 ppm and an area intensity SB of a peak observed at –150 to 0 ppm is 3.5 or greater, or a peak is observed at –150 to 0 ppm and a peak is not observed at 0 to 30 ppm.

The invention discloses a method for separating phosphorus pentafluoride-hydrogen chloride mixed gas, which comprises the following steps of: introducing the phosphorus pentafluoride-hydrogen chloride mixed gas into a reaction kettle by taking a perfluoropolypropyl ether fluorinated solution as a solvent and lithium fluoride as a raw material, so that the phosphorus pentafluoride and the lithium fluoride react to generate lithium hexafluorophosphate, and hydrogen chloride is discharged in a gas phase manner; heating the generated lithium hexafluorophosphate to decompose the lithium hexafluorophosphate into phosphorus pentafluoride and lithium fluoride, discharging the phosphorus pentafluoride in a gas phase manner, and retaining the lithium fluoride in the perfluoropolypropyl ether fluorinated solution for recycling; the solvent and raw materials provided by the invention can be recycled for multiple times, the whole process flow is greatly simplified, and efficient and stable separation of HCl and phosphorus pentafluoride is realized.

The present application belongs to the technical field of lithium extraction, and aims to solve the technical problems of high alkali concentration, high energy consumption and limited leaching efficiency in the existing low-grade lithium ore alkali lithium extraction. In the medium concentration sodium hydroxide system, the method promotes the dissolution of lepidolite through composite soluble sodium salt. The leaching rate of lithium reaches or is higher than that of high concentration sodium hydroxide system. The process is simple and controllable, suitable for efficient lithium extraction of low-grade lithium ore, and has significant industrial application value.

The embodiment of the invention provides a dynamic crystallization process temperature control system and method, and relates to the technical field of dynamic crystallization process control technologies. The method comprises the following steps: carrying out gradient cooling on feed liquid according to a preset first curve so as to enable the feed liquid to enter a metastable region; applying an ultrasonic pulse to the feed liquid at a preset time point when the feed liquid is in the metastable region so as to induce synchronous nucleation; and after the ultrasonic pulse is applied, carrying out first cooling treatment to control crystal growth. According to the invention, the problem of low crystallization quality is solved, so that the effect of improving the crystallization quality is achieved.

The present invention relates to a mixed oxide of titanium, niobium, and lanthanum of formula (I): LiwTi1-xLaxNb2-yM1yO7-zM2z (I) in which: 0.03 ≤ x ≤ 0.08; M1 and M2 are at least one element selected from the group consisting of V, Ta, Fe, Co, Ti, Bi, Sb, As, P, Cr, Mo, W, B, Na, Mg, Ca, Ba, Pb, Al, Zr, Si, Sr, K, Cs, and Sn; 0 ≤ w ≤ 5, 0 ≤ y < 2, and 0 ≤ z ≤ 0.3. Figure for abbreviation: [Fig. 8]