88 results about "Lithium hydride" patented technology

The invention relates to the technical field of battery production, and discloses a preparation method of high-purity lithium sulfide, which comprises the following steps: preparing high-purity sulfur powder; pretreating lithium hydride; proportioning and feeding; carrying out high-speed ball milling treatment; cooling at normal temperature; carrying out ball milling detection; and collecting and packaging. According to the preparation method of the high-purity lithium sulfide, the argon is filled in the ball milling tank, so that the reaction between the lithium hydride and the high-purity sulfur powder is always carried out under the protection of the argon, the safety of the reaction can be ensured, and meanwhile, the use of toxic gas in the production process of the lithium sulfide can be reduced; the high efficiency and safety of the lithium sulfide production process are guaranteed, meanwhile, the converter with the rotating structure at the bottom of the ball milling tank drives the ball milling tank to continuously rotate, full heating and heating uniformity of lithium hydride and high-purity sulfur powder are guaranteed, and then the reaction efficiency and safety of the device in the high-purity lithium sulfide preparation process are improved.

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention relates to the field of electrolyte, and provides a lithium borohydride-lithium iodide composite solid electrolyte material as well as a preparation method and application thereof. The preparation method comprises the following steps: A, adding lithium borohydride into a solvent anhydrous tetrahydrofuran for dissolving, and then adding lithium iodide to form a uniform solution; b, transferring the solution into a closed container, and removing the solvent in vacuum until the solution is converted into a solid; and carrying out heating heat treatment to obtain the composite solid electrolyte material. According to the method, a liquid phase method is adopted, lithium borohydride is firstly added into an anhydrous tetrahydrofuran solvent, then anhydrous lithium iodide is added into the anhydrous tetrahydrofuran solvent, and trace water in tetrahydrofuran is removed by using lithium borohydride, so that the sample purity is ensured, and the ionic conductivity of the material is improved. The invention also provides an application of the lithium borohydride-lithium iodide composite solid electrolyte material in an all-solid-state battery.

The invention relates to lithium sulfide and a preparation method thereof.The preparation method includes the following steps that sublimed sulfur powder and a lithium source are mixed and subjected to a heating reaction, and the lithium source comprises at least one of anhydrous lithium hydroxide, lithium hydroxide monohydrate, lithium oxide, lithium hydride and lithium carbonate; a reducing gas is introduced while the heating reaction is performed, or the reducing gas is introduced after the heating reaction is finished, and a reduction reaction is performed; and after the reaction is finished, introducing protective gas for calcining to prepare the lithium sulfide. The preparation method provided by the invention can realize low-cost and high-purity production of lithium sulfide, and ensures the safety and environmental protection of the production process.

The invention provides a lithium hexafluorophosphate preparation method, which comprises: 1, adding a molecular sieve into an acetonitrile solvent, uniformly shaking, and standing; step 2, filtering the mixture after standing to obtain a treated acetonitrile solvent, and regenerating and recycling the filtered molecular sieve; 3, preparing the dried potassium hexafluorophosphate and the treated acetonitrile solvent, and putting the mixture into a container; 4, stirring the solution in the container, adding lithium hydride in a stirring state, and introducing ammonia gas to carry out catalytic reaction until the reaction is finished; 5, filtering the reactant in the step 4, carrying out reduced pressure distillation on the filtrate, recovering part of the solvent, and carrying out cooling crystallization to obtain a complex of lithium hexafluorophosphate and acetonitrile; and step 6, filtering the complex in the step 5, and carrying out vacuum drying to obtain the lithium hexafluorophosphate. The method provides a green process for preparing the lithium hexafluorophosphate, which integrates safety, economy and environmental protection.

The present disclosure relates a first wall adapted to cover an inner wall (113) of a vessel (106), the first wall being made of a liquid metal mixture (111) comprising at least lithium and lithium hydride.

The invention discloses lithium borohydride and a preparation method thereof, and belongs to the technical field of hydrogen storage material preparation. The preparation method provided by the invention comprises the following steps: in a hydrogen atmosphere of 50bar, mixing lithium hydride, triethylamine borane and an organic solvent, and performing mechanical ball milling to obtain a mixture; and evaporating the solvent in the mixture, and carrying out heat treatment to obtain the lithium borohydride. Lithium borohydride is prepared through mechanical ball milling, the preparation process is high in safety coefficient, low in energy consumption, simple in process, mild in condition, adjustable in reaction process and easy to implement; the optimal yield is 80%, and the method is originally superior to other similar processes, has technical conditions for efficient mass production, and has a wide application prospect in hydrogen storage materials.

The invention relates to a method for preparing norambrox ether from sclareolide. The method comprises the following steps: 1) preparing a red aluminum toluene solution; 2) dissolving sclareolide with toluene to obtain a sclareolide toluene solution, adding the sclareolide toluene solution into the red aluminum toluene solution for complete reaction, and quenching with a NaCl solution to obtain a reactant containing sclarediol; 3) carrying out oil-water separation on the reactant to obtain a primary organic phase and a water phase, so as to obtain an organic phase containing sclarediol; 4) carrying out a dehydration reaction on the organic phase containing sclarediol by using a molecular sieve, and after the reaction is completed, separating out an organic phase containing norambrox ether; 5, the organic phase containing the norambergyl ether is subjected to distillation concentration and crystallization separation, and a norambergyl ether product is obtained.According to the method, sclareolide is reduced through the red aluminum, and compared with lithium aluminum hydride, hydroboron and red aluminum, the red aluminum has the advantages of being good in stability, beneficial to industrialization, low in reaction temperature and safe.

The invention discloses a large-scale lithium hydride hydrolysis hydrogen release device and method, and the device comprises a hydrolysis reaction unit which is used for the hydrolysis reaction of lithium hydride to generate hydrogen; a hydrogen treatment unit for purifying, storing, pressurizing and drying hydrogen; and the liquid phase treatment unit is used for treating a liquid phase product of the hydrolysis reaction of the lithium hydride. Through interaction among the hydrolysis reaction unit, the hydrogen treatment unit and the liquid phase treatment unit, continuous and stable external supply of hydrogen and hot water is realized, generation of waste gas and waste water is reduced, and reduction of environmental pollution is facilitated.

The invention discloses a preparation method of a three-dimensional silicon-carbon negative electrode material, which comprises the following steps: adding an organic phenol compound, a catalyst and an organic template into an alkaline solution, uniformly mixing, adding an aldehyde compound, uniformly mixing, carrying out condensation polymerization, filtering, activating, and introducing carbonization gas to obtain carbon nanotube doped spherical porous carbon; transferring the carbon nanotube doped spherical porous carbon into a tubular furnace, and introducing lithium hydride gas for metal lithium deposition to obtain lithium / carbon nanotube doped porous carbon; the preparation method comprises the following steps: depositing and passivating nano silicon by a silane cracking method to obtain an intermediate, uniformly mixing the intermediate with liquid asphalt, and carbonizing to obtain the modified asphalt. The power performance, the cycle performance and the first efficiency of the silicon-carbon material can be improved.

The invention relates to the field of battery electrode materials, and discloses an Al and LiH co-doped silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out powder tabletting on Si and LiAlH4, carrying out vacuum heat treatment at 160-190 DEG C for 3-6 hours, and then carrying out vacuum heat treatment at 200-300 DEG C for 2-5 hours to obtain the Al and LiH co-doped silicon negative electrode material. According to the invention, co-doping of metal aluminum and lithium hydride is formed in the silicon negative electrode material through a specific method, so that the lithium ion battery can be endowed with higher initial coulombic efficiency and cycling stability.

The invention discloses an integrated sulfide solid electrolyte production system and method. The integrated sulfide solid electrolyte production system comprises a raw material pretreatment and feeding unit, a first-stage ball milling reactor, an online treatment device, a second-stage synthesis reactor and a whole-course inert gas protection and control system which are connected in sequence, the raw material pretreatment and feeding unit is used for drying and accurately metering sulfur powder and lithium hydride; the first-stage ball-milling reactor is used for receiving raw materials conveyed by the feeding unit and carrying out high-energy ball-milling reaction to generate a primary product containing lithium sulfide; the online treatment device is used for carrying out reaction promotion and impurity removal treatment on the primary product; the second-stage synthesis reactor receives the treated lithium sulfide product and mixes the treated lithium sulfide product with other sulfide raw materials to synthesize a target electrolyte; according to the whole-course inert gas protection and control system, the raw material pretreatment and feeding unit, the first-stage ball milling reactor, the online treatment device and the second-stage synthesis reactor are integrated in a closed inert atmosphere environment, so that continuous or semi-continuous transmission of materials is realized.

The invention provides lithium sulfide, a preparation method thereof and a solid-state battery, and belongs to the technical field of batteries, and the preparation method of the lithium sulfide comprises the following steps: performing hydrosulfide reaction on water-containing hydrosulfide and lithium salt dissolved in a first solvent under the protection of inert gas to obtain a first lithium hydrosulfide suspension, and performing solid-liquid separation to obtain a first lithium hydrosulfide solution, the first solvent comprises an aprotic polar organic solvent; decompressing and dewatering the first lithium hydrosulfide solution to obtain a second lithium hydrosulfide suspension, and performing solid-liquid separation to obtain a second lithium hydrosulfide solution in which the water content is 0.05-2%; and desulfurizing the second lithium hydrosulfide solution to obtain a lithium sulfide suspension, and carrying out solid-liquid separation to obtain lithium sulfide. According to the present invention, the low-cost water-containing hydrosulfide is selected as the raw material, the pressure reducing water removal process is added to remove the impurities, and then the desulfurization is performed to obtain the high-purity lithium sulfide;

The application discloses a method for producing formaldehyde at low temperature, and belongs to the technical field of formaldehyde production. The method comprises the following steps: preparing a high-efficiency catalyst by taking iron nitrate nonahydrate, ammonium molybdate tetrahydrate and lithium hydride as raw materials; feeding mixed gas of methanol and air into a reactor filled with the high-efficiency catalyst under the condition that the temperature is 250-280 DEG C; and collecting gas at the outlet of the reactor to complete the method for producing formaldehyde at low temperature. The embedding of lithium can expand the crystal lattices of the catalytic products, thereby generating a large number of oxygen vacancies, enhancing the electron-donating capacity, and enabling the adsorption of p-formaldehyde to be quickly dissociated and the active sites to be quickly reduced at a relatively low temperature, so that the activity of subsequent catalysis is ensured. The plasma treatment can increase the surface area and the number of active sites of the high-efficiency catalyst, and further improve the catalytic activity. The method for producing formaldehyde at low temperature can improve the conversion rate of methanol and the yield of formaldehyde at a relatively low temperature, and is helpful to reduce energy consumption and reduce the volatilization of Mo.

The invention provides a catalyst for synthesizing flaky CBN, flaky CBN and a preparation method and application of the flaky CBN. According to the sheet-shaped CBN synthesis catalyst, magnesium nitride and lithium hydride are taken as main components of the catalyst, calcium boride and titanium nitride are taken as catalyst additives, and the CBN synthesis catalyst with relatively small catalyst viscosity is designed. Hexagonal boron nitride is used as an initial raw material, under the action of the catalyst, irregular flaky orange CBN is synthesized at high temperature and high pressure, and the CBN has the characteristics of low strength, high sharpness and the like, and has the characteristic of high self-sharpening when being used as an abrasive material. The invention further provides application of the flaky CBN serving as a grinding material in grinding high-speed steel, surface hardening steel, hard alloy, alloy steel, nickel-based high-temperature alloy or cobalt-based high-temperature alloy, and therefore the grinding efficiency can be effectively improved.

This invention belongs to the field of compound synthesis technology and provides a method for preparing lithium aluminum hydride. The method includes the following steps: mixing an organic solution of aluminum trichloride and an organic solution of lithium hydride to perform a displacement reaction, obtaining a mixture of lithium aluminum hydride; mixing the lithium aluminum hydride mixture with a hydrocarbon solvent and performing solid-liquid separation to obtain lithium aluminum hydride. Lithium aluminum hydride is insoluble in hydrocarbon solvents and precipitates out, further improving the yield of lithium aluminum hydride; simultaneously, unreacted aluminum trichloride dissolves in the hydrocarbon solvent, thereby increasing the main content of lithium aluminum hydride. The preparation process of this invention has high yield, stable product content, and is easy to implement and industrialize.

A preparation method of a lithium battery positive electrode lithium supplement additive, after fully mixing and dissolving an organic lithium salt and a hydroxybenzene compound in a solvent, further adding lithium hydride, naphthyl lithium / tetrahydrofuran dispersion, lithium metal, lithium hydroxide or lithium carbonate, after sufficient reaction, filtering the reaction solution and drying to obtain a lithium battery positive electrode lithium supplement additive. The present invention adopts organic small molecule catechol and its derivatives, and can synthesize positive electrode lithium supplement materials under relatively mild conditions, effectively make up for the loss of active lithium in the first cycle of charging and discharging of lithium batteries, form a good positive electrode and negative electrode interface layer inside the battery, no residue in the positive electrode after lithium supplementation, and greatly improve the stability of the positive electrode and the service life of the battery, comprehensively improve the high-voltage stability of the positive electrode of the lithium ion battery and the electrochemical stability of the electrolyte, and ensure the safe and stable operation of the lithium battery.

The invention relates to the technical field of lithium hydride preparation processes, in particular to a lithium hydride hydrogen storage material and a synthesis process thereof.The synthesis process comprises the steps that high-purity metal lithium is cut, cleaned and then dried in an inert atmosphere, obtained high-purity metal lithium particles are put into an evaporation device, and gradient heating is conducted in the inert atmosphere to obtain lithium steam; adding the activated catalyst into a reaction kettle, cooling the lithium steam to obtain liquid lithium, introducing the liquid lithium into the reaction kettle, introducing high-purity hydrogen, heating to react, and cooling to obtain lithium hydride; putting into crushing equipment, crushing in an inert atmosphere, and sieving to obtain lithium hydride particles; and packaging and carrying out quality inspection to obtain the lithium hydride hydrogen storage material. According to the lithium hydride hydrogen storage material and the synthesis process thereof, liquid-gas reaction of liquid lithium and hydrogen avoids continuous influence of passivation films such as an oxide layer and a nitride layer on the surface of solid lithium, and finally the lithium hydride hydrogen storage material with high purity and high activity is prepared.

The application discloses a rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material and a preparation method thereof. The rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material comprises a rare earth nitride and an aminomagnesium-lithium hydride composite system. The preparation method comprises the following steps: mixing aminomagnesium with lithium hydride, adding the rare earth nitride in the mixing process, transferring the mixed mixture into a ball mill tank, and ball milling under inert gas protection to obtain the rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material. The raw material synthesis process is simple and controllable, and the cost is low. The hydrogen storage performance of the aminomagnesium-lithium hydride composite hydrogen storage material can be obviously improved by adding a small amount of the rare earth nitride. Moreover, the rare earth nitride can be purchased through a commercial channel, and the adding mode can be directly mixed with the raw material.

The application discloses a kind of rare earth hydride nanoparticles solvothermal method preparation process, it is with rare earth metal salt, lithium hydride and graphene as raw material, it is added in high-pressure reactor containing organic solvent and mixed uniformly, it is heated to 100-120 DEG C under inert atmosphere condition stirring, incubation reaction 1.5-2.5 h, after reaction is finished, cooling to room temperature, filter collection black product, wash with organic solvent, finally product is vacuum dried at 65-75 DEG C 1-2 h, obtain the rare earth hydride nanoparticles.The application process is simple and efficient, the product obtained is small and uniformly distributed, high purity, when it is used for neodymium iron boron magnet grain boundary diffusion technology, it can be effectively attached in the grain boundary region of neodymium iron boron magnet, decompose and release active rare earth element at high temperature, so as to adjust the composition and structure of grain boundary, can significantly improve the thermal stability and coercive force of magnet, while reducing the use amount of heavy rare earth and production cost.

The invention discloses high-purity lithium borohydride and a preparation method thereof, and belongs to the technical field of inorganic synthesis.The preparation method comprises the steps that firstly, surface coordination activation is conducted on micron-sized lithium hydride through amino silane, and the reaction activity of the micron-sized lithium hydride is remarkably improved; and then, in a uniform ionic liquid organic solvent composite medium, efficiently synthesizing lithium borohydride with a purified borane complex at a mild temperature. For key impurity chloride ions, trimethylchlorosilane is innovatively introduced to carry out targeted precipitation conversion, and effective removal is carried out before crystallization. And finally, directly separating out a high-purity product from a reaction system through a directional crystallization technology. According to the high-purity lithium borohydride and the preparation method thereof disclosed by the invention, high-efficiency preparation of high-purity and low-chloride-ion lithium borohydride under a mild condition is realized, a key reagent can be recycled, and the problems of high energy consumption and insufficient purity in a traditional method are perfectly solved.

The invention relates to a preparation method of diisopropylamine silane, which comprises the following steps: (1) reacting dichlorosilane with diisopropylamine to obtain diisopropylamine chlorosilane; and (2) carrying out a reaction on the diisopropylamine chlorosilane obtained in the step (1) and lithium hydride to obtain the diisopropylamine silane. The preparation method of diisopropylamine silane in the prior art is optimized, a complex catalyst does not need to be prepared in advance, raw materials are simple and easy to obtain, reaction steps are simple, high-temperature and high-pressure reaction conditions are avoided, the reaction conditions are mild, the obtained target product has high yield and purity, and industrial large-scale production is facilitated.

The present disclosure relates to a method for separating lithium from a lithium mixture, the method comprising: —providing a first mixture (104) comprising lithium, lithium hydride, and at least a first compound among lithium deuteride and lithium tritide, the first mixture being at a first temperature: —a first stirring step (108) adapted to stirring the first mixture: —a first cooling step (110) adapted to cooling. preferably uniformly. the first mixture to a second temperature lower than the first temperature: the first stirring and cooling steps being adapted to deposit at least part of the first compound: and —a first separation step (116) adapted to separating at least the deposited first compound from the first mixture. forming a second mixture (118) comprising at least lithium and lithium hydride.

The invention relates to a preparation method and application of a lithium sulfide material containing lithium polysulfide. The preparation method comprises the following steps: weighing lithium hydride and powdered sulfur according to a molar ratio of 2: (1.01-1.10), dividing the lithium hydride into 2-4 parts, taking one part of lithium hydride and powdered sulfur, mixing and ball-milling, sequentially adding the rest lithium hydride, and ball-milling to obtain mixture powder containing lithium sulfide and lithium polysulfide, namely the lithium sulfide material containing lithium polysulfide. Sulfur loss caused by phosphorus pentasulfide decomposition and sulfur element volatilization in the sulfide solid electrolyte preparation and sintering process is supplemented through lithium polysulfide, and the purity and the room-temperature ionic conductivity of the sulfide solid electrolyte are improved.

The invention provides a silicon-carbon composite electrode and a preparation method thereof, and relates to the technical field of electrochemical energy storage. The preparation method of the silicon-carbon composite electrode comprises the following steps: S1, soaking a current collector in a silicate solution, taking out the current collector, and carrying out heating treatment to obtain a silicon dioxide-loaded current collector; s2, carrying out magnesiothermic reduction reaction on the silicon dioxide-loaded current collector, and carrying out acid pickling to obtain a silicon particle-loaded current collector; s3, adding lithium hydride into the current collector loaded with the silicon particles, and heating to obtain a current collector loaded with lithium-silicon alloy; and S4, soaking the current collector loaded with the lithium-silicon alloy in a phenolic resin solution, taking out the current collector, and carrying out carbonization treatment to obtain the silicon-carbon composite electrode. The silicon-carbon composite electrode provided by the invention can effectively inhibit the volume expansion of the active material during charge-discharge circulation, and is beneficial to improving the cycling stability and rate capability of the battery.

The application discloses a preparation method of lithium hydride ceramic microspheres and belongs to the field of nuclear reactor application materials. The prepared lithium hydride ceramic microspheres have a diameter of 0.5-3 mm, a maximum sphericity of 99.01%, and a compressive strength of 98.25 N. The preparation method of the ceramic microspheres is to use airflow to compress and blow an object through a nozzle, the principle of which is to generate a pressure difference between the upper and lower surfaces of the object to provide a lifting force to offset the gravity of the object, so that the object is in a suspended state and is supported without a container or a mold in an inert gas atmosphere. Subsequently, the suspended lithium hydride block is heated by adjusting the laser intensity to rapidly melt the lithium hydride block, so that molten droplets are formed. The droplets are rapidly spheroidized under the blowing of argon gas and rapidly solidified into microspheres. The lithium hydride ceramic microspheres provided by the application have a high lithium density and can be used as tritium breeder material for a fusion reactor tritium production blanket. The lithium hydride ceramic microspheres are crucial for the realization of tritium self-sustaining and stable operation of the fusion reactor, and the application has great significance for the development and utilization of nuclear fusion energy.

The invention provides a preparation method of lithium sulfide, which is low in cost, simple in process and high in product purity. The preparation method comprises the following steps: S10, drying lithium hydride; s20, in an inert atmosphere, adding the dried lithium hydride into a heating closed reaction kettle, stirring the lithium hydride, and heating the lithium hydride to a target reaction temperature at the same time; s30, keeping stirring the lithium hydride at the target reaction temperature, injecting hydrogen sulfide gas into the heating closed reaction kettle for multiple times, closing the heating closed reaction kettle after each time of injection of the hydrogen sulfide gas, monitoring the pressure in the heating closed reaction kettle in real time, and stopping heating after the pressure in the heating closed reaction kettle stops increasing; all gases in the heating closed reaction kettle are pumped out in a vacuum pumping mode, hydrogen sulfide gas is continuously injected into the heating closed reaction kettle for the next time after gas is pumped out every time until the total gas amount of hydrogen sulfide injected into the heating closed reaction kettle reaches the target total gas amount, and a lithium sulfide product is obtained.

The invention discloses a graphite phase carbon nitride-based titanium dioxide doped lithium aluminum hydride hydrogen storage material, with dicyandiamide and titanyl sulfate as raw materials, dicyandiamide as carbon source and nitrogen source, and titanyl sulfate as titanium source; calcined after grinding and mixing, and then ball-milled with lithium aluminum hydride with a doping amount of TiO2@g-C3N4 of 3-10wt%; wherein the micromorphology of g-C3N4 is a porous structure, the micromorphology of TiO2 is a nanoparticle structure, the particle size of TiO2 nanoparticles is 8-9nm, and the micromorphology of TiO2@g-C3N4 is that TiO2 is uniformly loaded on the surface of g-C3N4. Its preparation method includes: 1, pretreatment of raw materials; 2, preparation of graphite phase carbon nitride-based titanium dioxide; 3, preparation of graphite phase carbon nitride-based titanium dioxide doped lithium aluminum hydride hydrogen storage material. As a hydrogen storage material, the initial dehydrogenation temperature is 72-82.3℃, the dehydrogenation amount is 6.6-7.3wt%, and the dehydrogenation rate is 69.8-71.7%. It has the advantages of reducing process difficulty, reducing production costs, and improving product consistency.

Described herein are methods for recovering lithium metal, lithium hydride, or lithium hydroxide from lithium salts by dissolving the lithium salt in ionic liquids and applying a current to the solution.

A hydrogen extraction system for extracting hydrogen from a liquid electrolyte 102 comprising at least one isotopologue of lithium hydride (LiH), the system including an electrolysis cell 100 comprisi