65 results about "Carbon impurities" patented technology

The invention relates to the technical field of battery raw materials, in particular to a preparation method of lithium sulfide powder, the lithium sulfide powder and application, and the preparation method comprises the following steps: uniformly mixing lithium sulfate and a carbon source according to a preset proportion to obtain a first mixture; performing first heat treatment on the first mixture in inert gas to obtain a second mixture; and performing second heat treatment on the second mixture in reducing gas to obtain the lithium sulfide powder. The product obtained by the preparation method disclosed by the invention is the lithium sulfide powder, and the obtained lithium sulfide powder has the advantages of less oxygen and carbon impurities, higher purity and high reaction activity, and meets the synthesis requirements of the electrolyte; according to the preparation method, in the process of preparing lithium sulfide, toxic gas and organic solvent are not used, the reaction temperature is low, the energy consumption is low, the requirement on production equipment is low, the process is simple, the cost is low, harmful gas emission is avoided, safety and environment friendliness are achieved, and industrialization is easy to achieve.

The invention relates to a method for preparing high-purity quartz sand by burning organic silicon as a raw material, and belongs to the technical field of synthesis of quartz sand. The method comprises the following steps: introducing purified organic silicon into a combustor, and combusting to obtain nano silicon dioxide powder; then sintering is carried out to remove moisture, hydroxyl and carbon impurities on the surface of the powder, sintered silicon dioxide powder is obtained, and acid leaching and cleaning are carried out to remove metal impurities on the surface and in the powder; roasting the cleaned silicon dioxide powder in a chlorine atmosphere to remove moisture, hydroxyl and residual metal impurities; and carrying out high-temperature densification treatment on the roasted silicon dioxide powder, and then crushing, grinding and screening to obtain the high-purity quartz sand. The particle size of the prepared high-purity quartz sand ranges from 50 micrometers to 300 micrometers, the purity is larger than or equal to 99.999%, and the apparent density is larger than or equal to 2.1 g / cm < 3 >. The method breaks through the limitation of natural mineral purification, and provides a brand new path for large-scale production of high-added-value quartz sand.

The invention discloses a method for separating valuable metal in a waste photovoltaic welding strip through reduction smelting-vacuum gasification-vulcanization, and belongs to the technical field of resource recycling. The method comprises the steps that the waste photovoltaic welding strip is placed in a reducing atmosphere and heated for reduction smelting, so that carbon impurities on the surface of the waste photovoltaic welding strip are removed, tin, lead, silver and copper oxides on the surface are reduced, and a copper-tin-lead-silver alloy is obtained; then, heating the decarbonized and deoxidized photovoltaic welding strip under a vacuum condition, and carrying out vacuum gasification separation to obtain condensed metal lead and a copper-tin-silver alloy; and finally, sulfur is added into the copper-tin-silver alloy for vacuum vulcanization-separation, and volatile matter stannous sulfide and residual copper-silver alloy are obtained. According to the method, valuable metals in the waste photovoltaic solder strip can be efficiently separated, and the method has the advantages of being green and economical.

The invention relates to a preparation method of a terbium-doped gadolinium oxysulfide fluorescent material. The performance of the material is remarkably improved through an optimized high-temperature solid-phase method. According to the process, firstly, polyvinylpyrrolidone (PVP) and dopamine hydrochloride are used as a dispersing agent and a coating agent to prepare uniformly dispersed Gd2O3 and Tb4O7 oxide precursors, then through a fluxing agent system with the synergistic effect of boric acid and lithium carbonate and in combination with a low-temperature pre-sintering-medium-temperature vulcanization-high-temperature crystallization three-stage sintering process, grain aggregation and abnormal growth are effectively inhibited, and the Gd2O3 / Tb4O7 composite material is obtained. And finally, annealing in air to remove carbon impurities to obtain the superfine fluorescent powder with small particle size and narrow distribution. Experiments show that the particle size D50 of the fluorescent powder in the embodiment is 496-678 nm, the fluorescence decay life exceeds 1100 microseconds, the luminous intensity is high, the stability is excellent, and the fluorescent powder has wide application prospects in the fields of liquid crystal display, biomedicine and the like.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The chemical formula of the sulfide solid electrolyte is Li7-aPS6-aXa, X is selected from at least one of Cl, Br and I, and a is greater than or equal to 1 and less than or equal to 2; wherein the sulfide solid electrolyte comprises carbon generated in situ in the synthesis process, the content of the carbon is M, and M is more than or equal to 0.03 wt% and less than or equal to 0.5 wt%. According to the method disclosed by the invention, the inert solvent is used and the solvent dosage is reduced, so that the introduction of oxygen and carbon impurities is reduced, the high purity and high ionic conductivity of the product are ensured, and meanwhile, the environmental pollution, the energy consumption and the production cost are remarkably reduced.

The application discloses a treatment method for reducing carbon content of REBCO powder, and relates to the technical field of superconducting material preparation. The treatment method is that the REBCO powder is placed in an ozone-containing atmosphere for heat treatment. The core principle of the treatment method is that the strong oxidizing property of ozone and active oxygen atoms generated by the decomposition of ozone are used to directly oxidize carbon impurities in the REBCO powder into CO2 gas at a lower temperature, and meanwhile, the superconducting phase is avoided from being damaged. It is verified by a carbon analyzer that the carbon reduction efficiency of the powder after ozone heat treatment is several times higher than that of the powder after traditional oxygen atmosphere treatment.

The utility model relates to the technical field of impurity separation, in particular to a nano-particle amorphous carbon impurity low-speed centrifugal separation device which comprises a separation tank, an internal support and a screening structure, the separation tank comprises a tank body, and four lifting sliding plates are fixedly arranged on the inner wall of an upper opening of the tank body at equal angles; the inner bracket comprises a bearing; the outer ring of the bearing is slidably clamped with the inner wall of the tank body; the screening structure comprises a fixed edge, the outer side surface of the fixed edge is fixedly connected with the bearing inner ring, four lifting sliding blocks are fixedly installed on the lower edge of the outer side surface of the fixed edge at equal intervals, and the bottom sides of the lifting sliding blocks abut against the upper surfaces of lifting sliding plates in a sliding mode. According to the centrifugal separation device, the lifting sliding blocks slide on the upper surfaces of the lifting sliding plates, the supporting frame structure and the screening structure continuously conduct lifting and falling actions through guiding of the lifting sliding plates, and nanoparticles in the screening structure can be continuously turned over while centrifugal separation work is conducted.

This application relates to the field of electrolyte materials technology, and in particular to a method for preparing lithium selenide. The method includes: obtaining a precursor source, the precursor source including lithium nitride and a selenium source, and subjecting the precursor source to multiple calcination treatments to obtain lithium selenide. The present invention uses lithium nitride as a lithium source and a selenium source to undergo a redox reaction to generate lithium selenide and nitrogen gas. This method has a low cost, does not produce carbon impurities in the prepared product, and the prepared lithium selenide can be used directly as a high-purity raw material for solid electrolytes. In addition, the reaction between lithium nitride and selenium has low exothermic reaction, the reaction is easy to control, and the safety is higher, avoiding the problem of low safety caused by high exothermic reaction of elemental selenium and elemental lithium in the prior art.

The invention provides a regeneration method of a decommissioned lithium iron phosphate positive electrode material, which comprises the following steps: uniformly mixing the decommissioned lithium iron phosphate positive electrode material and a lithium salt supplement in an organic solvent to obtain a precursor mixture; and carrying out a repair reaction on the precursor mixture in a high-pressure CO2 atmosphere to obtain the regenerated lithium iron phosphate material. According to the method, carbon impurities, especially inorganic carbon, are removed through pressurized CO2 assisted heat treatment, meanwhile, structural defects are repaired, active sites are exposed through selective carbon removal, lithium migration is promoted, residual carbon maintains a conductive network, and in addition, agglomeration of a high-voltage inhibiting material guarantees structural uniformity; therefore, compared with a traditional method, the regenerated lithium iron phosphate material is lower in lithium / iron antisite defect rate and more stable in structure, meanwhile, stable components of the regenerated lithium iron phosphate material are ensured, and the electrochemical performance is guaranteed.

The invention relates to the technical field of metallurgical engineering, and provides a method for determining organic carbon impurities in titanium tetrachloride, which comprises the following steps: filtering a titanium tetrachloride sample to remove inorganic carbon impurities; reacting the filtered sample with an oxidizing agent under pressurizing and heating conditions, so that organic carbon impurities in the sample are converted into a carbon-containing gas-phase product and solid-phase residues; collecting and measuring the carbon content in the carbon-containing gas-phase product to obtain the gas-phase carbon content; carrying out distillation separation on the reacted liquid, collecting residues, and measuring the carbon content in the residues to obtain the solid-phase carbon content; and adding the gas-phase carbon content and the solid-phase carbon content to obtain the content of the organic carbon impurity in the titanium tetrachloride. According to the scheme, high-precision and high-specificity quantitative analysis on the organic carbon impurities in the titanium tetrachloride is realized.

The invention belongs to the technical field of drug detection and analysis, and particularly relates to a method for detecting related substances in 24-norursodeoxycholic acid synthesis. According to the method for detecting related substances in 24-norursodeoxycholic acid synthesis, a chromatographic column with octadecylsilane chemically bonded silica as a filler is selected, a phosphate solution-acetonitrile is used as a mobile phase, and a differential refraction detector is used as a detector. The detection method has a relatively good retention effect on the 3 [alpha]-hydroxy-7-keto-5beta-cholestane-23-acid and related 23 carbon impurities, and the sample peak shape is good. Meanwhile, the detection method also has the advantages of strong specificity, good repeatability, wide linear range and high sensitivity, and can conveniently and effectively realize the detection and analysis of the 3alpha-hydroxy-7-keto-5beta-cholestane-23-acid intermediate and related 23 carbon impurities.

The invention relates to a method for producing lithium sulfide with reduced or no carbon impurities, wherein the lithium sulfide containing carbon impurities is treated with hydrogen gas at a temperature in the range of 450 to 1000 DEG C. The invention also relates to lithium sulfide which can be produced in this way and which has a carbon impurity content of less than 0.3% by weight, based on the weight of the lithium sulfide. Such lithium sulfide is used to produce battery components, preferably solid electrolytes, and solid state batteries.

The application relates to the field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The sulfide solid electrolyte has a chemical formula of Li 7‑a PS 6‑ a X a X is at least one selected from Cl, Br and I, and 1<=a<=2; wherein the sulfide solid electrolyte comprises carbon generated in situ in a synthesis process, and the content of the carbon is M, 0.03 wt%<=M<=0.5 wt%. The method provided by the application reduces the introduction of oxygen and carbon impurities by using an inert solvent and reducing the solvent consumption, ensures high purity and high ionic conductivity of the product, and significantly reduces environmental pollution, energy consumption and production cost.

The invention provides a long-afterglow silicon dioxide nanosphere as well as a preparation method and application thereof, and belongs to the technical field of inorganic nano materials. In order to solve the problems that an existing room temperature phosphorescence (RTP) material depends on metal or organic fluorophores, the light stability is poor, the biotoxicity is high and the like, the long afterglow silicon dioxide nanospheres free of the metal and the organic fluorophores are prepared through a silicon source copolycondensation and calcination defect engineering strategy. According to the material, a silicon source precursor and a silane coupling agent are used as raw materials, polysaccharide-assisted copolycondensation is performed to form a triple bond Si-O-network, and then high-temperature calcination is performed to generate optical activity defects related to carbon impurities in a silicon dioxide matrix, so that long-life room-temperature phosphorescence (the afterglow life reaches 1.852 s) is realized. The material has the characteristics of excellent light stability, low biotoxicity and no autofluorescence interference, is suitable for anti-counterfeiting device imaging, and breaks through the defects of low luminous efficiency and poor stability of the traditional RTP material.

The invention relates to small-particle-size molybdenum powder and a preparation method thereof, and belongs to the field of powder metallurgy preparation.The preparation method comprises the steps that a molybdenum source, nanometer conductive carbon black and a dispersing agent are mixed in an aqueous solvent, and a composite precursor with the nanometer conductive carbon black isolated and dispersed by the molybdenum source is constructed through spray drying; then carrying out two-step treatment of low-temperature carbon thermal reduction and medium-temperature carbon migration in an inert atmosphere to obtain a pre-reduced intermediate product; and finally, deep reduction and gas-phase decarburization are completed in a wet hydrogen atmosphere with specific water vapor content, and residual carbon is thoroughly removed through water gas reaction. According to the method, the core contradiction that the granularity refinement of the molybdenum powder and the deep removal of the carbon impurities are difficult to consider in the traditional method is solved through the coordinated regulation of the whole process from the precursor structure design to the reduction decarburization process, and the method has the advantages of superfine granularity, extremely low carbon and oxygen impurity content and excellent comprehensive performance.

The application provides a method for removing carbon impurities and metal impurities from a single-walled carbon nanotube crude product, and relates to the technical field of separation and purification of carbon nanotube materials. The method comprises the following steps: performing calcination treatment on the single-walled carbon nanotube under a carbon dioxide atmosphere, then performing toluene reflux, adding polyvinylpyrrolidone and acid, and obtaining purified single-walled carbon nanotubes. The method removes excess amorphous carbon by calcination under the condition of carbon dioxide gas, realizes high separation of the single-walled carbon nanotubes by refluxing in toluene, simultaneously adds concentrated acid and polyvinylpyrrolidone to remove metal impurities, and finally performs high-temperature calcination to decompose the residual polyvinylpyrrolidone, thereby improving the purity of the single-walled carbon nanotubes. The purification method has the characteristics of high purity, high efficiency and high-quality products. The method has relatively excellent purification efficiency, and the purified single-walled carbon nanotubes have relatively high purity.

The invention discloses a device and a method for removing organic carbon in hydrogen peroxide. The device comprises a hydrogen peroxide receiving device for receiving hydrogen peroxide to be treated; the resin adsorption device is connected with the hydrogen peroxide adsorption device, and resin in the resin adsorption device can perform adsorption treatment on organic carbon in the hydrogen peroxide; the treated qualified hydrogen peroxide flows into a qualified hydrogen peroxide liquid receiving device to be collected. In addition, a resin regeneration device connected with the resin adsorption device is further arranged, and when resin is regenerated, the device can provide resin regeneration treatment for the resin adsorption device. The resin regeneration device is composed of a resin regeneration tower, a solution A storage device, a solution B storage device and a nitrogen storage device. Through reasonable arrangement and cooperative work of all the devices, the technical problems that in the prior art, the removal efficiency of organic carbon impurities in hydrogen peroxide is low, the regeneration process is tedious, and safety is poor are effectively solved.

The invention relates to the technical field of waste lithium ion battery recovery, in particular to a multi-atmosphere plasma ball-milling waste lithium iron phosphate carbon residue removal and lattice reconstruction regeneration integrated method, which comprises the following steps of: disassembling a waste lithium iron phosphate battery, and performing ultrasonic separation to obtain a carbon-containing positive electrode material; decomposing the binder and the SEI film through argon plasma in cooperation with ball milling; gas is discharged, high-purity oxygen is introduced, plasma excitation and mechanical ball milling are synchronously started, a carbon layer is stripped through mechanical shearing force, meanwhile, active oxygen species are used for directionally oxidizing carbon impurities into CO / CO2 gas, and dynamic decarburization is achieved; according to the method, gas is discharged, a lithium source is added, hydrogen is introduced, high-activity hydrogen free radicals (H < + >) and electrons are generated through hydrogen plasma ionization, Fe < 3 + > is reduced into Fe < 2 + >, and low-temperature, efficient and zero-pollution integrated regeneration is achieved in single equipment through the synergistic effect of argon-oxygen-hydrogen dynamic switching and plasma-mechanical force; and an innovative scheme capable of being applied on a large scale is provided for green circulation of the power battery.

The application discloses a kind of MOCVD preparation method and device of wafer level single crystal molybdenum disulfide;The preparation method uses six carbonyl molybdenum Mo (CO) 6 and liquid carbon disulfide CS2 as molybdenum source and sulfur source respectively, different from traditional MOCVD growth process, precursor used in the application does not contain hydrogen element, avoid the side effect caused by hydrogen element, and increase the pre-reaction of source cracking, by introducing oxygen, generate intermediate product molybdenum trioxide (MoO3) and sulfur element (S) in pre-reaction chamber, to the reaction chamber on the substrate surface deposition, effectively avoid the introduction of carbon impurities, realize the nucleation and epitaxial growth of single crystal orientation on the substrate surface, obtain high uniformity and continuity single crystal molybdenum disulfide film, realize 6 inch and above size single crystal wafer scale preparation, meet the key needs of high density, high performance electronic device integration.

This invention provides a method and apparatus for segmented and precisely controlled enhanced separation of carbon- and arsenic-containing fine-grained gold ore, belonging to the field of mineral processing technology. The apparatus includes a feeding system, a heating system, a suspension roasting furnace, a gas supply system, a detection system, and a grinding and leaching system. The method involves: first, crushing and grinding the carbon- and arsenic-containing fine-grained gold ore, then drying it; next, conveying the ore powder to the pre-oxidation chamber of the suspension roasting furnace for pre-oxidation and arsenic removal roasting in a suspended state; then feeding it into the oxidation chamber of the suspension roasting furnace for decarburization roasting in a suspended state; after the decarburized roasted ore has naturally cooled, adding water for grinding, and cyaniding the slurry to obtain a gold-bearing precious liquor. This invention can precisely control the desulfurization and decarburization of carbon- and arsenic-containing fine-grained gold ore under suitable conditions, achieving high mass and heat transfer efficiency, high arsenic and carbon impurity removal rates, low energy consumption and cost per unit processing volume, easily controllable and stable product properties, and easy scaling up of equipment.

The application relates to a method for preparing high-purity quartz sand by burning organic silicon as raw material, and belongs to the technical field of synthetic quartz sand. The purified organic silicon is introduced into a burner to obtain nano silicon dioxide powder by burning; then, sintering is carried out to remove water, hydroxyl and carbon impurities on the surface of the powder, thereby obtaining sintered silicon dioxide powder; acid immersion and cleaning are further carried out to remove metal impurities on the surface and in the interior of the powder; the cleaned silicon dioxide powder is calcined under a chlorine atmosphere to remove water, hydroxyl and residual metal impurities; the obtained calcined silicon dioxide powder is subjected to high-temperature densification treatment, and then is crushed, ground and screened to obtain high-purity quartz sand. The high-purity quartz sand prepared by the application has a particle size of 50-300 mu m, a purity of 99.999%, and an apparent density of 2.1 g / cm 3 . The method breaks through the limitation of natural mineral purification and provides a new path for the large-scale production of high-value-added quartz sand.

This invention belongs to the field of micro / nano fabrication technology, specifically a method for preparing a diamond color center array based on a phase-separated nanomask. The invention includes two schemes: Scheme 1 includes: pretreatment of diamond raw material; deposition of a hard mask layer on the diamond surface; coating an adhesive layer; coating with a phase-separable patterned block copolymer or a polymeric material such as a biomolecule that can be assembled; annealing the diamond; selectively etching the surface film to form a nanomask; nitrogen ion implantation to form an NV color center array; removing the hard mask; and removing surface carbon impurities through vacuum high-temperature annealing and acid washing to obtain a high-quality color center array. Scheme 2 simplifies the hard mask deposition steps by directly coating a thick film of a phase-separable patterned polymeric material onto the diamond raw material surface. This invention achieves low-cost, high-mask precision and resolution, high-throughput scalability, and large-area nanomask ion implantation color center array preparation by employing two different process flows.

The present application relates to a kind of small granularity molybdenum powder and its preparation method, belong to powder metallurgy preparation field, molybdenum source, nano conductive carbon black and dispersant are mixed in aqueous solvent, and the composite precursor of nano conductive carbon black is isolated and dispersed by molybdenum source is constructed by spray drying;Subsequently, two-step processing of low-temperature carbon thermal reduction and medium-temperature carbon migration is carried out in inert atmosphere, and pre-reduction intermediate product is obtained;Finally, deep reduction and gas phase decarburization are completed in the wet hydrogen atmosphere of specific water vapor content, and residual carbon is completely removed using water gas reaction.The present application solves the core contradiction that molybdenum powder granularity refinement and carbon impurity deep removal are difficult to consider in traditional method by whole-process synergistic regulation from precursor structure design to reduction decarburization process, with ultrafine granularity, extremely low carbon and oxygen impurity content, and excellent comprehensive performance.

The invention provides a composite carbon material based on coal gasification slag and a preparation method and application thereof.The preparation method comprises the steps that the coal gasification slag with the water content ranging from 16 wt% to 30 wt% is loaded into an electromagnetic induction container, electromagnetic induction heating treatment is conducted through alternating current, the composite carbon material is output after heating is conducted to the temperature ranging from 1200 DEG C to 2500 DEG C, the frequency of the alternating current ranges from 12000 Hz to 15000 Hz, and the electromagnetic induction heating treatment is conducted on the coal gasification slag with the water content ranging from 16 wt% to 30 wt%; and the output power of the power supply is 15000W to 20000W. The coal gasification slag belongs to industrial byproduct waste, selective enrichment of a carbon structure and effective removal of non-carbon impurities can be realized under the action of a high-temperature electromagnetic field by introducing an electromagnetic induction heating process, and the crystallinity, orderliness and purity of a carbon phase in a material are remarkably improved; the composite carbon material with high specific surface area, an sp2 / sp3 hybrid structure and a multi-element synergistic stabilization mechanism is formed, the composite carbon material is named as Ordos alkene, and the Ordos alkene shows good conductivity, light absorption and high-temperature stability and is suitable for multiple fields of photoelectric functional materials, microwave absorption materials, energy storage device electrodes and the like.

The invention provides chelate resin, a preparation method of the chelate resin and application of the chelate resin to purification of regenerated gas of a polycrystalline silicon adsorption tower. The preparation method comprises the following steps: preparation of crosslinked polystyrene microspheres, chloromethylation of polystyrene-divinyl benzene microspheres and grafting of activated stilbene glucoside. The chelating resin and the molecular sieve are matched for use, so that impurities such as B, P and methane in regenerated hydrogen of an adsorption tower in a polycrystalline silicon production technology can be efficiently removed, the accumulation amount of boron, phosphorus and carbon impurities in a large polycrystalline silicon production system along with time change is reduced, and the quality of polycrystalline silicon can be greatly improved.

The application discloses an easily-dispersed high-conductivity high-purity single-wall carbon nanotube material and a preparation method thereof, relates to the technical field of single-wall carbon nanotube material preparation, and comprises the following steps: mixing single-wall carbon nanotube crude pipes with a nitrogen source, performing a reaction in a tube furnace to obtain carbon pipe intermediate product 1; mixing the carbon pipe intermediate product 1 with a dispersing agent, then mixing the carbon pipe intermediate product 1 with a solvent, performing emulsification, and performing suction filtration to obtain carbon pipe intermediate product 2; mixing the carbon pipe intermediate product 2 with mixed acid to perform a reaction, and performing cleaning and drying to obtain a final product. The single-wall carbon nanotube crude pipes are mixed with a nitrogen-containing nonmetal compound nitrogen source, compressed air is introduced to perform a reaction, and then dispersion and mixed acid treatment are sequentially performed, so that the effect of effectively removing amorphous carbon impurities and metal catalyst impurities is achieved, and the problem that, due to insufficient purity of existing carbon pipes, when the carbon pipes are used as conductive additives to prepare electrode materials, the uniformity of an electrode conductive network cannot be guaranteed, and then the overall electrochemical performance of the electrode is affected can be solved.

The invention relates to the technical field of carbon nanotube impurity removal, in particular to a purification method of a single-walled carbon nanotube, the high-purity single-walled carbon nanotube and application of the high-purity single-walled carbon nanotube. The invention provides a high-purity single-walled carbon nanotube. The high-purity single-walled carbon nanotube is characterized in that in mixed acid prepared from perchloric acid, concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1: 3: 3, the mass content of metal measured in a test that the mass ratio of the high-purity single-walled carbon nanotube to the mixed acid is 1: 100 and the temperature is 200 DEG C for 30 min is smaller than or equal to 0.5%; the rapid oxidation weight loss temperature in a thermogravimetric differential curve obtained by testing the high-purity single-walled carbon nanotube in an air atmosphere under the condition that the heating rate is 10 DEG C / min is 740-800 DEG C. The high-purity single-walled carbon nanotube has relatively low metal impurities and carbon impurities, high conductivity and good conductivity, and is beneficial to improving the electrochemical performance of a battery prepared from the high-purity single-walled carbon nanotube.

The invention relates to a method for producing lithium sulfide with reduced or no carbon impurities, in which lithium sulfate and optionally lithium sulfite, lithium disulfate and / or other lithium sulfur oxides, as well as the carbon impurities containing lithium sulfide, are treated with hydrogen gas at a temperature in the range of 300 to 600 DEG C. The invention also relates to a lithium sulfide which can be produced in this way and which has a carbon impurity content of less than 2.0% by weight, based on the weight of the lithium sulfide. The lithium sulfide is used to produce battery components, preferably solid electrolytes, and solid state batteries.

The invention relates to the technical field of permanent magnet materials, in particular to a high-resistivity sintered neodymium-iron-boron magnet and a preparation method thereof, and the preparation method comprises the following steps: (1) smelting raw materials to obtain an alloy ingot; (2) performing hydrogen decrepitation on the alloy ingot to obtain coarse powder; (3) performing airflow grinding on the coarse powder to obtain magnetic powder; (4) compounding the magnetic powder and the modified nano silicon dioxide to obtain composite powder; (5) carrying out compression molding on the composite powder to obtain a green body; and (6) sintering and aging the green body to obtain the high-resistivity sintered neodymium-iron-boron magnet. On the basis of the existing formula process, the nano silicon dioxide is better dispersed in the grain boundary, so that the electric conductivity of the magnet is reduced, and the high-resistance magnet is obtained; carbon impurities brought by a silane coupling agent introduced by dispersed nano silicon dioxide in the magnet preparation process are eliminated, and the brittleness of the magnet is prevented from being improved.