14 results about "Lithium hydroxide monohydrate" patented technology

A process for producing lithium hydroxide monohydrate from lithium chloride, the process comprising: (a) adding an aqueous potassium ion and hydroxide ion-containing solution to an aqueous lithium chloride-containing solution, thereby obtaining a mixture comprising lithium hydroxide, potassium chloride and water, (b) selectively precipitating potassium chloride from the mixture, thereby obtaining potassium chloride precipitate and a first mother liquor solution, (c) separating the potassium chloride precipitate from the first mother liquor solution, (d) processing the potassium chloride precipitate to obtain an aqueous potassium hydroxide-containing solution, (e) adding the aqueous potassium hydroxide-containing solution to the separated first mother liquor solution, thereby obtaining a potassium hydroxide-enriched first mother liquor solution, and (f) selectively precipitating lithium hydroxide monohydrate from the potassium hydroxide-enriched first mother liquor solution, thereby obtaining lithium hydroxide monohydrate precipitate and a second mother liquor solution.

This invention belongs to the field of battery materials technology, specifically relating to a one-step continuous dehydration and sulfidation method for preparing lithium sulfide from lithium hydroxide monohydrate. This invention uses LiOH·H₂O as the lithium source for preparing lithium sulfide, significantly reducing costs. The dehydration and sulfidation steps are completed continuously and uninterruptedly within the same reaction vessel, using the same batch of materials, through program control. There are no intermediate material transfer, separation, or intermediate processing steps, avoiding exposure to air for moisture absorption, oxidation, and the introduction of impurities, thus ensuring high product purity.

A method for producing battery-grade lithium hydroxide monohydrate with low carbonate content from impure lithium feedstock, the method comprising: forming a concentrated lithium hydroxide solution saturated or nearly saturated with lithium hydroxide monohydrate; removing at least some lithium carbonate from the solution; crystallizing the lithium hydroxide monohydrate; and separating the crystallized lithium hydroxide monohydrate from the solution.

The present application relates to the technical field of high polymer antibacterial health protection materials, in particular to a preparation method of a universal copper-based nanometer material, wherein copper hydroxide precipitate is obtained by adding sodium hydroxide solution into copper chloride water solution step by step, and then copper oxide nanoparticles are obtained by drying and grinding; copper nitrate trihydrate, lithium hydroxide monohydrate and water are mixed and then hydrothermally dispersed to obtain copper hydroxide nanowires; copper chloride dihydrate, lithium hydroxide monohydrate and water are mixed to obtain copper oxide nanosheet; finally, copper oxide nanoparticles, copper hydroxide nanowires and copper oxide nanosheet are dispersed and mixed to obtain a copper-based nanometer compound. The present application is a new type of copper-based nanometer antibacterial material with regular prism / rod microstructure, high dispersibility, strong base material compatibility, high temperature resistance and excellent durability. The material can be truly embedded in different base materials instead of only staying on the surface, and can be universally applied in various material systems such as silica gel, latex and yarn.

The application discloses a motor lubricating grease composition, which comprises a thickening agent, base oil and an additive, and specifically, the thickening agent is 10-15%, the base oil is 85-90%, and the sum of the mass percentages of the two is 100%; the additive is additionally added in a proportion of 1-5%; the thickening agent is composed of mixture A and mixture B; a) the mixture A is a reactant of dodecahydroxy stearic acid, organic dibasic acid and saturated aqueous solution of lithium hydroxide monohydrate, and the molar ratio of the dodecahydroxy stearic acid to the organic dibasic acid is 1:0.1-1; b) the mixture B is an amide compound, and the amide compound is a mixture of one or more of dodecanamide, hexadecanamide, octadecanamide, octadecenoic acid amide, docosanamide, docosenoic acid amide, N,N-dimethyl dodecanamide and N,N'-ethylene bis-stearamide in an arbitrary ratio. The application can effectively prolong the service life of the lubricating grease, prolong the grease replenishing period and prolong the service life of the motor.

Process for obtaining lithium sulfate that involves generating salts from sulfated brines to be subsequently processed and generate finished products such as lithium carbonate and / or lithium hydroxide monohydrate. The process includes optimizing the precipitation of Li2SO4*H2O in ponds, for which it includes adding magnesium chloride or calcium chloride to the natural brine, decreasing the SO4 / Mg ratio, avoiding the precipitation of other sulfated salts that later concentrate together with the lithium sulfate in a flotation stage, minimizing the performance of the collector in the plant and increasing the impurities in the final product.

This invention discloses a lithium-containing organic cathode material, the preparation method of which includes the following steps: S1. Mixing 1,4-dihydroxyanthraquinone, lithium hydroxide monohydrate, and a solvent, stirring and reacting under heating conditions, and then removing the solvent to obtain a solid powder; S2. Heat-treating the obtained solid powder under an inert atmosphere at a temperature above 200°C, and then cooling to obtain the product. This invention, through rational molecular structure design, directly introduces lithium into the molecular framework of 1,4-dihydroxyanthraquinone, thereby significantly expanding its application range. Based on this, matching with a PVDF-based polymer electrolyte effectively reduces the dissolution problem caused by contact with polar solvents. Benefiting from the electron-withdrawing effect and space charge effect of adjacent carbonyl functional groups, this material achieves a record-breaking high discharge plateau—approximately 3.4 V. Thanks to its high oxidation plateau (above 3.2 V), it can be stored for a long time in air.

The application provides a method for preparing high-purity lithium hydroxide monohydrate and recycling rubidium and cesium, comprising the following steps: (1) mixing, ball-milling and roasting lithium ore, a sulfate and an additive at high temperature to obtain clinker; (2) crushing and grinding the clinker in step (1) and using water to obtain a leaching solution; (3) adding the leaching solution in step (2) into a three-chamber electrolytic cell for constant-current electrolysis to obtain an anode liquid, an intermediate liquid and a cathode liquid; (4) obtaining sulfuric acid from the anode liquid, evaporating and concentrating the intermediate liquid, step-by-step cooling and crystallization to obtain rubidium sulfate, cesium sulfate and sodium-potassium sulfate for roasting in step (1), and evaporating and concentrating the cathode liquid to obtain high-purity lithium hydroxide monohydrate. The high-purity lithium hydroxide monohydrate can be obtained through high selectivity of lithium ion solid-state electrolyte thin film to lithium, the utilization rate of potassium, rubidium and cesium is improved, the whole process is green and environmentally friendly, the comprehensive utilization rate of lithium ore is improved, and the product value is high.

The application discloses a cellulose-based lithium battery diaphragm and a preparation method thereof, and relates to the technical field of battery diaphragms. In the preparation of the cellulose-based lithium battery diaphragm, polyaryletherketone is sulfonated with concentrated sulfuric acid to obtain modified polyaryletherketone; 6-chloro-1-hexene is grafted on cellulose to obtain modified cellulose; the modified cellulose and the modified polyaryletherketone are mixed to be electrospun and photopolymerized to obtain a pre-modified cellulose film; nonafluorohexyltrimethoxysilane is hydrolyzed and grafted to the surface of the pre-modified cellulose to obtain a modified cellulose film; lithium fluoride nanoparticles are prepared by reacting lithium hydroxide monohydrate and ammonium fluoride, and then the lithium fluoride nanoparticles are impregnated and coated on the surface of the modified cellulose film to obtain the cellulose-based lithium battery diaphragm. The cellulose-based lithium battery diaphragm prepared by the application has excellent swelling resistance, thermal stability and electrochemical performance.

This application belongs to the field of lithium-ion battery cathode material technology. Addressing the technical problem that existing cobalt-free lithium-rich layered oxide modification strategies cannot simultaneously achieve high reversible capacity and excellent rate performance, this application provides a modified cobalt-free lithium-rich manganese-based cathode material and its preparation method. A lithium-rich manganese-based base material is synthesized by calcining an Al-doped nickel-manganese hydroxide precursor with lithium hydroxide monohydrate (LiOH·H2O). This base material is then mixed with ammonium fluoride and dispersed in the organic solvent N-methyl-2-pyrrolidone. The solid portion is then calcined to obtain a fluorinated, cobalt-free, lithium-rich manganese-based cathode material. The resulting interface structure achieves a synergistic decoupling effect between ion conduction and electronic insulation, resulting in ultra-high capacity and excellent rate performance of the cobalt-free lithium-rich manganese system.

The application belongs to the technical field of lithium ion battery materials, and particularly relates to a high-nickel single-crystal ternary positive electrode modified material and a preparation method thereof. The method comprises the following steps: after high-nickel single-crystal ternary precursors, lithium hydroxide monohydrate and cerium-tantalum co-doped lithium molybdenum oxyfluoride compounds are ball milled, pre-sintering and high-temperature calcination are performed under an oxygen atmosphere, and single-crystal particle powder is obtained by crushing; then the single-crystal particle powder is mixed with calcium-doped lithium boron phosphorus oxynitride compounds, dried, and then heat treated under a nitrogen atmosphere and sieved. The cerium-tantalum co-doped lithium molybdenum oxyfluoride compounds are prepared by ball milling, drying and step-by-step sintering in a protective powder from lithium carbonate, cerium oxide, tantalum oxide, molybdenum oxide and lithium fluoride; the calcium-doped lithium boron phosphorus oxynitride compounds are prepared by ball milling, step-by-step sintering from lithium carbonate, calcium carbonate, boric acid and ammonium dihydrogen phosphate, and then ball milling and sintering with lithium nitride under nitrogen protection. The application significantly improves the structural stability and electrochemical performance of the high-nickel single-crystal ternary positive electrode material.

This invention belongs to the field of lithium-ion battery material technology, specifically relating to a high-nickel single-crystal ternary cathode modified material and its preparation method. The method includes: ball milling a high-nickel single-crystal ternary precursor, lithium hydroxide monohydrate, and a cerium-tantalum co-doped lithium molybdenum oxyfluoride compound, followed by pre-sintering and high-temperature calcination under an oxygen atmosphere to obtain single-crystal powder particles; then mixing the single-crystal powder particles with a calcium-doped lithium boron phosphorus oxynitride compound, drying, and holding under a nitrogen atmosphere before sieving. The cerium-tantalum co-doped lithium molybdenum oxyfluoride compound is prepared by ball milling, drying, and segmented sintering of lithium carbonate, cerium oxide, tantalum oxide, molybdenum oxide, and lithium fluoride in a protective powder; the calcium-doped lithium boron phosphorus oxynitride compound is prepared by ball milling, segmented sintering, and ball milling and sintering with lithium nitride under nitrogen protection. This invention significantly improves the structural stability and electrochemical performance of the high-nickel single-crystal ternary cathode material.

The application discloses a method for synthesizing santalol, which comprises the following steps: 1) dispersing santalene, N-bromosuccinimide, benzoyl peroxide and aminated carbon material in an organic solvent to perform a substitution reaction, so as to obtain brominated santalene; 2) dispersing the brominated santalene and sodium peroxoacetate in an organic solvent to perform an esterification reaction, so as to obtain santalene acetic acid ester; and 3) dispersing the santalene acetic acid ester and lithium hydroxide monohydrate in a methanol aqueous solution to perform a hydrolysis reaction, so as to obtain santalol. The method for synthesizing santalol has the advantages of simple operation process, short reaction time, mild reaction condition, high raw material conversion rate, high product yield, high product selectivity, green environmental protection and the like, and is suitable for large-scale industrial application.

The application discloses a preparation method of lithium ion battery positive electrode material based on a sol-gel method, which comprises the following steps: dissolving cobalt acetate tetrahydrate, manganese acetate tetrahydrate, lithium hydroxide monohydrate and citric acid in deionized water, heating by using an oil bath pot, obtaining dry gel, performing long-time vacuum drying at a certain temperature, removing water to obtain porous fluffy gel with holes; grinding the fluffy gel into uniform powder, pre-burning in a tube furnace under an air atmosphere, then taking out the powder, regrinding, gradually heating to different temperatures at a slow heating rate under an oxygen atmosphere, slowly reducing to room temperature, and completing the preparation of the lithium ion battery positive electrode material. The lithium ion battery positive electrode material synthesized at a calcination temperature of 800 DEG C has good electrochemical performance, the particle size of the product is appropriate, the surface area is optimal, and the electrochemical performance is good.