35 results about "Lithium hydride" patented technology

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 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 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 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.

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

The various embodiments of the disclosure relate generally to compositions of shelf-stable LOXSH catalyst solution compositions comprising from about 120 ppm to about 1200 ppm hydride ion concentration (from about 950 to about 9600 ppm as lithium hydride) as a homogenous hydrocarbon solution. The various embodiments of the disclosure also relate generally to processes, methods, and systems, that enable the formation and hence utilization such shelf-stable LOXSH catalyst and reagent solutions.

The invention relates to a method for preparing high-purity lithium sulfide from a by-product hydrogen sulfide in production of carbon disulfide, belongs to the technical field of preparation of solid-state battery electrolyte materials, and solves the technical problems of high energy consumption, low purity, failure in high-value utilization of hydrogen sulfide and the like in existing lithium sulfide preparation. According to the solution, the method for preparing the high-purity lithium sulfide from the byproduct hydrogen sulfide during production of the carbon disulfide comprises the following steps: 1) preparing the hydrogen sulfide: preparing the carbon disulfide and the byproduct hydrogen sulfide gas from methane and sulfur; (2) preparing dimethyl sulfoxide; 3) dissolving a lithium source; 4) preparation of lithium sulfide through vulcanization reaction: placing the lithium compound dissolved solution in a reaction kettle, introducing hydrogen sulfide gas, forming a lithium hydrosulfide intermediate in an oxygen-free and water-free environment, and converting the lithium hydrosulfide intermediate into lithium sulfide; compared with the prior art, the method has the advantages that high-valued application of the hydrogen sulfide gas is realized, the purity of lithium sulfide is high, the energy consumption is low, and the green chemistry concept is met.

The invention discloses a method for preparing high-purity lithium sulfide and a safe ball milling system.The method comprises the following steps that S1, proportioning is conducted according to the molar ratio of lithium hydride to sulfur powder being (2-2.2): 1, and therefore the problems of heat accumulation and overheat loss caused by long-time continuous operation of equipment can be effectively avoided by adopting a batch standing operation mode, and the service life of the equipment is prolonged; according to the present invention, with the design of the multi-tank alternate cycle operation, the production operation efficiency is improved, the reaction environment and the process stability are optimized so as to significantly improve the product yield and the purity of the lithium sulfide, and the controllable design is adopted for the hydrogen emission link so as to reduce the production cost. The potential explosion hidden danger caused by hydrogen gathering is eliminated from the source, meanwhile, a real-time pressure monitoring and feedback mechanism is arranged in a matched mode, dynamic control over pressure parameters in the production process is achieved, protection is carried out with the assistance of an explosion-proof membrane, and therefore the safety of production operation is effectively improved.

The invention discloses a method and a system for preparing high-purity lithium sulfide based on a mechanochemistry principle, and belongs to the field of inorganic chemistry and battery materials. According to the method, mechanical force is applied to lithium hydride, a sulfur source and a lithium source compound, and self-propagating exothermic reaction is triggered and maintained to generate lithium sulfide; the system comprises a reaction cavity, a mechanical force generation mechanism, a control module and an integrated gas treatment device. The core of the method is that through systematic integration and cooperation of three technical dimensions of mechanical force triggering, closed-loop control and in-situ purification, fundamental reconstruction from an energy utilization mode to a product purification path is realized. Compared with the prior art, the method has the advantages that the production energy consumption and the purification cost are expected to be greatly reduced, the raw material adaptability is wide, and a subversive technical path is provided for low-cost and large-scale production of the ultra-high-purity lithium sulfide.

This invention discloses a high-purity lithium borohydride and its preparation method, belonging to the field of inorganic synthesis technology. The method includes: surface activation of lithium hydride with an aminosilane activator, reaction with a borane-tetrahydrofuran complex at 30-80℃, followed by impurity removal through a combination of lithium bromide and alkaline alumina, negative pressure decomposition, crystallization, washing, and drying to obtain high-purity lithium borohydride. The obtained product is a white crystalline powder with a purity ≥99.90%, chloride ions ≤15ppm, free alkali ≤50ppm, and metallic impurity Na. + / K + / Al 3+ ≤5 / 5 / 1ppm, particle size D50=5-15μm, ionic conductivity at 25℃≥3.0×10 ‑5 S / cm, moisture absorption rate ≤0.1% / 24h. This invention has wide raw material adaptability, mild process, and high product purity, and is suitable for solid electrolytes, pharmaceutical synthesis and other fields.

The invention provides an alkyl uracil derivative and a preparation method and application thereof, and relates to the technical field of organic synthesis.The preparation method comprises the following steps that a uracil analogue and olefin are subjected to a hydrogenation alkylation reaction under the action of an iron catalyst and a hydrogen source, and the alkyl uracil derivative is obtained; the iron catalyst comprises at least one of iron nitrate nonahydrate, ferrous nitrate, ferric chloride, ferrous chloride, ferric sulfate and ferric oxalate; the hydrogen source comprises at least one of sodium borohydride, lithium borohydride, lithium aluminum hydride, triphenyl silicon, triethyl silicon and borane. According to the present invention, the olefin is adopted as the alkyl raw material, the pre-functionalization is not required, the specific catalyst and the specific hydrogen source are combined, the hydrogenation alkylation reaction of the olefin and the uracil analogue is successfully achieved, and the technical effect of constructing a series of alkyl uracil derivatives is achieved. According to the invention, the reaction can be carried out at room temperature without light and heat conditions, the reaction time is short, and the functional group tolerance is better.

The invention belongs to the field of hydrogen storage materials, and provides a planetary shear mixing method of metal hydride powder. According to the invention, a planetary shear mixer is adopted to carry out pulse-type shear mixing on a metal hydride main phase, Ti-MgH2 core-shell intermediate powder, a catalytic doping agent, a heat-conducting and anti-agglomeration auxiliary agent, lithium hydride and a lubricating and coating auxiliary agent in the same direction of revolution and rotation in an inert atmosphere; by accurately controlling revolution speed, autorotation speed ratio and unit mass specific energy input, highly uniform dispersion and interface modification of the powder are realized, and particle size distribution uniformity, specific surface area, compact density and effective hydrogen storage capacity retention rate of the mixed powder are remarkably improved. The technical problems of high compaction density and hydrogen absorption and desorption dynamic coupling, strong shear dispersion and core-shell structure stability balance, contradiction between carbon-based network construction and effective hydrogen storage density and the like of an existing hydrogen storage system are solved, and wide hydrogen storage application value is achieved.

The invention belongs to the technical field, and discloses a preparation method of a novel program type sintered lithiated silicon-oxygen negative electrode material, which is used for solving the technical problems of low initial efficiency and poor stability of the silicon-oxygen negative electrode material. The preparation method comprises the following steps: (1) placing an organic matter coated silica precursor in an inert atmosphere, heating to a peak temperature of 900-1100 DEG C at a heating rate of 500-900 DEG C / s, keeping the temperature for 10-40 seconds, and slowly cooling to room temperature by a stepped cooling program to obtain a carbon coated silica composite material; and (2) mixing the carbon-coated silicon-oxygen composite material obtained in the step (1) with lithium hydride, and sintering in an inert atmosphere to obtain the lithiated silicon-oxygen negative electrode material. According to the present invention, the internal crystal nucleus can be further refined during the further lithiation operation of the structure formed by the carbon-coated instantaneous sintering strategy, the internal structure stress of the material is reduced through the synergistic effect of the instantaneous sintering and slow cooling strategy, the charge-discharge stability is improved, and the industrial negative electrode solution is provided for the high energy density battery.

The invention relates to a lithium-rich solid electrolyte material and a preparation method and application thereof.The preparation method comprises the steps that an iron-doped titanium aluminum lithium phosphate material is prepared, the chemical general formula of the iron-doped titanium aluminum lithium phosphate material is Li < 1 + x > Al < x-y > Fe < y > Ti < 2-x > (PO4) 3, x is larger than or equal to 0.3 and smaller than or equal to 0.5, and y is larger than 0 and smaller than 0.5; uniformly mixing the iron-doped lithium titanium aluminum phosphate material with lithium hydride in a protective gas environment, and sealing for later use to obtain a mixed material; and introducing protective gas into a tubular furnace in advance to remove air, putting the mixed material into the tubular furnace, raising the temperature of the tubular furnace in a protective gas environment to carry out second sintering treatment, reducing the furnace temperature to room temperature after sintering is finished, discharging, and screening to obtain the lithium-rich solid electrolyte material, the lithium-rich solid electrolyte material serving as an additive is mixed with a negative active material to prepare a negative pole piece, and the negative pole piece is applied to the lithium ion battery, so that the first-week coulombic efficiency and the charge-discharge capacity of the battery can be improved.

The embodiment of the present application relates to a kind of organic lithium solution recovery method and solid-state lithium-containing product, comprising: the solute of the organic lithium solution to be recycled includes Li-aromatic hydrocarbon complex, solvent includes ether reagent;The organic lithium solution to be recycled also includes lithium hydride;The recovery method includes: for lithium oxidation gas is introduced into the organic lithium solution to be recycled, so that lithium element in the Li-aromatic hydrocarbon complex is oxidized, and the solid-state product generated is deposited on the surface of lithium hydride, and form the solution containing suspended particles;The ether reagent and aromatic hydrocarbon compound in the solution containing suspended particles are evaporated and separated by heating, to obtain the separated solid-state lithium-containing compound, ether reagent and aromatic hydrocarbon compound;The solid-state lithium-containing compound is treated by water or alcohol, to remove lithium hydride in the solid-state lithium-containing compound.

The embodiment of the present application provides a space nuclear reactor shield arranged on one side of a space nuclear reactor body and used for shielding a neutron and photon radiation field from the reactor body. The shield comprises: a beryllium shielding layer used for reflecting and shielding the neutron from the reactor body; a tungsten shielding layer connected to the outer side of the beryllium shielding layer, coaxially arranged with the beryllium shielding layer, and used for shielding the photon; a boron carbide shielding layer connected to the outer side of the beryllium shielding layer, coaxially arranged with the beryllium shielding layer, and used for absorbing the neutron and reducing secondary photons generated by the neutron in the shield; and a lithium hydride shielding layer connected to one end of the beryllium shielding layer and coaxially arranged with the beryllium shielding layer, and used for shielding the neutron from the reactor body. The shield in the embodiment of the present application can reasonably use the efficient neutron shielding material lithium hydride, and can avoid the irradiation swelling problem of lithium hydride.

The invention belongs to the technical field of hydrogen storage materials, and particularly discloses a method for improving hydrogen storage performance of lithium hydride, which comprises the following steps: selecting lithium hydride powder; doped metal element powder is selected; ultrasonically dispersing the graphene nanosheets in absolute ethyl alcohol to form dispersion liquid; adding lithium hydride powder and metal element powder into a grinding tank of a high-energy ball mill; paving the doped lithium hydride powder on a sample table of atomic layer deposition equipment, and depositing a thin film: adding the lithium hydride powder subjected to surface treatment into graphene ethanol dispersion liquid, carrying out ultrasonic dispersion for 30 minutes, carrying out rotary evaporation to remove ethanol, and carrying out vacuum drying; the composite powder is subjected to ultrasonic washing with deionized water, centrifugation and cold press molding, and a disc-shaped sample is obtained. According to the method for improving the hydrogen storage performance of the lithium hydride, the hydrogen storage capacity, the dynamic performance and the cycling stability of the lithium hydride are synchronously improved aiming at the defects of the hydrogen storage performance of the lithium hydride in the prior art.

The embodiment of the invention discloses a liquid-phase synthesis method of lithium sulfide, sulfide-based solid electrolyte and a lithium ion battery, the method comprises the following steps: preparing lithium chloride and sulfur salt into a first suspension containing lithium hydrosulfide, and filtering to obtain a first lithium hydrosulfide solution; the first lithium hydrosulfide solution is cooled at the first temperature, crystals can be separated out from the second lithium hydrosulfide solution, meanwhile, the solubility of the solution is further reduced through separated-out water, impurity ions are further separated out, the impurity ions in the second lithium hydrosulfide solution are effectively reduced, and the lithium hydrosulfide solution is more stable in performance. Therefore, low impurity content in subsequently prepared lithium sulfide is ensured.

Methods are disclosed for the sustainable and scalable production of lithium metal. In one method, lithium salts such as lithium chloride are reduced using low-temperature hydrogen plasma to form lithium metal and lithium hydride. In another method, lithium hydride is thermally decomposed under vacuum or subjected to self-discharging in an Al / LiH / Pd circuit to yield lithium metal. The processes reduce harmful emissions, operate at lower temperatures than molten salt electrolysis, and produce high-purity lithium metal suitable for use in lithium-ion batteries.

This invention provides a method for producing lithium hydroxide anhydride from lithium hydroxide hydrate using a rotary kiln, comprising: a supply step wherein the lithium hydroxide hydrate is supplied to an area between: a heating section, a portion of the furnace core tube covered by heating apparatus; and one end of furnace core tube; a lithium hydroxide feed step wherein the lithium hydroxide hydrate that has been supplied is fed toward the other end of furnace core tube; a drying gas delivery step wherein 100oC or higher drying gas is delivered to the area between one end of furnace core tube and heating section, when the lithium hydroxide hydrate has been supplied; and a heating step wherein, during the lithium hydroxide feed step, the lithium hydroxide hydrate is heated and dehydrated by heating apparatus under temperature higher than 450oC and no more than 600oC.

The various embodiments of the disclosure relate generally to compositions of shelf-stable LOXSH catalyst solution compositions comprising from about 120 ppm to about 1200 ppm hydride ion concentration (from about 950 to about 9600 ppm as lithium hydride) as a homogenous hydrocarbon solution. The various embodiments of the disclosure also relate generally to processes, methods, and systems, that enable the formation and hence utilization such shelf-stable LOXSH catalyst and reagent solutions.

The application discloses a lithium borohydride-ammonium halide composite solid electrolyte and a preparation method and application thereof, and belongs to the technical field of solid-state battery electrolyte preparation. The application comprises the following steps: mixing lithium borohydride and ammonium halide to obtain a mixture; under a protective atmosphere, the mixture is heated to 90-180 DEG C and is subjected to heat preservation treatment; and under vacuum conditions, the heat preservation treated material is subjected to heat treatment, thereby obtaining the lithium borohydride-ammonium halide composite solid electrolyte. The application induces lithium borohydride crystal phase transition through ammonium halide decomposition, and effectively removes gaseous by-products through vacuum heat treatment, thereby significantly improving the ionic conductivity and electrochemical stability of the electrolyte, and the preparation process is simple and suitable for large-scale production.

A hydrogen extraction system for extracting hydrogen from a liquid electrolyte comprising at least one isotopologue of lithium hydride. The system includes an electrolysis cell comprising: an anode for generating hydrogen from the liquid electrolyte; a cathode spaced apart from the anode; and a solid-state electrolyte comprising a lithium-containing high entropy oxide (HEO) material. The solid-state electrolyte is for physically isolating the cathode from the liquid electrolyte and conducting lithium ions from the liquid electrolyte to the cathode.

The invention discloses a method for improving the catalytic SBS hydrogenation efficiency of a titanocene catalyst. The method comprises the following steps: obtaining a styrene / butadiene / styrene copolymer glue solution through an anionic polymerization method; carrying out hydrogenation reaction on the styrene / butadiene / styrene copolymer glue solution under the action of a siloxane cocatalyst, dicyclopentadiene titanium dichloride and lithium hydride to obtain a hydrogenated styrene / butadiene / styrene copolymer; by adopting the siloxane cocatalyst, the hydrogenation degree of the high-molecular-weight SBS can reach 98% or above, the problems of chromaticity and smell of the product can be solved, and in addition, a certain anti-sticking effect is achieved.

The invention relates to the technical field of silicon-based precursor synthesis processes, and particularly discloses a synthesis method of amino silane, which comprises a reaction kettle. The method comprises the following steps: adding magnesium chips and a solvent into a reaction kettle under the protection of inert gas, starting ultrasonic treatment with set parameters, and preheating to 30-40 DEG C for 30 minutes; stirring the mixed solution, and slowly dropwise adding an amine compound; the invention provides a synthesis method of amino silane, which comprises the following steps: reacting magnesium chips with an amine compound to generate a magnesium amide reagent under the ultrasonic action, and then reacting with chlorosilane to prepare an amino silane product. The method successfully overcomes the problem that the traditional lithium reagent (such as n-butyllithium, lithium methide and the like) and hydride (such as sodium hydride, lithium hydride and the like) easily cause polysubstituted byproducts in the reaction, and effectively avoids the problems of difficult separation, limited batch synthesis scale and the like caused by the generation of a large amount of hydrochloride in a direct synthesis method at the same time. The cheap and easily available magnesium chips are adopted to replace traditional raw materials, so that the cost is remarkably reduced.