37results about How to "High lithium content" patented technology

The invention discloses a method for recycling lithium carbonate from a lithium iron phosphate battery. The method comprises the following steps: (S0) discharging, decomposing and sorting the lithium iron phosphate battery and taking lithium iron phosphate powder; (S1) calcining under high temperature; (S2) performing oxidizing acid-pickling reaction, wherein the pH value is 0-1.5; (S3) filtering, thereby taking a filtrate I; (S4) adding alkali, regulating the pH value to be 2-4, filtering and taking the filtrate; (S5) adding alkali, regulating the pH value to be 8-11, filtering and taking the filtrate; (S6) performing evaporative crystallizing, sintering at 250-550 DEG C and taking the residual block powder; (S7) adding water for dissolving, filtering and taking the filtrate; (S8) dropwise adding a sodium carbonate solution, thereby acquiring lithium carbonate. According to the method, the technological process is simple, the cost is low, lithium iron phosphate batteries can be recycled in batches and the yield and the purity of lithium carbonate are high.

A forward osmosis process for concentration of lithium-containing salt solutions is described. A difference in osmotic pressure between a lithium-containing salt solution and a second salt solution of higher osmotic pressure is used as a driving force to pass water through a semi-permeable forward osmosis membrane from said lithium-containing salt solution of lower osmotic pressure to the salt solution of higher osmotic pressure. Also, a two-part operation is described wherein reverse osmosis process technology and forward osmosis process technology are used in tandem to concentrate lithium-containing salt solutions and to recover water that can be recycled to the process. The forward osmosis process is conducted without requiring (i) use of superatmospheric pressure or (ii) use of subatmospheric pressure or (iii) use of both such pressures, or (iv) use of one or more additives to assist in causing the flow of water through a forward osmosis membrane.

The invention relates to a lithium metal negative electrode, a preparation thereof and application of the lithium metal negative electrode. According to the lithium metal negative electrode, lithium metal is taken as a substrate; the surface, facing a positive electrode, of the substrate is sequentially coated with a solid lithium salt layer and a polymer electrolyte layer. When the lithium metalnegative electrode is applied to a lithium metal battery, an electrolyte system in which lithium ion concentration from a positive electrode to the negative electrode is in low-to-high gradient distribution can be formed. With the electrolyte with lithium ions in gradient distribution adopted, the problems of low ionic conductivity and high interface contact impedance in a solid electrolyte can beeffectively solved, and the problem of poor stability of an SEI film in a liquid electrolyte can be also solved; lithium dendritic crystal growth can be inhibited; and the cycling stability of a lithium battery can be improved. The electrolyte has important practical application value.

A lithium titanate product, the formula of which is in the form of Li_xTi_yO_z, and wherein, when y is 1, the x:y molar ratio is 1.1-1.8, while the z:y molar ratio is 2.0-4.5. Also disclosed is a method of preparing alkali metal titanates, such as lithium titanate, at a low temperature of below 100° C., from an aqueous titanium-containing slurry and an alkali metal compound.

The invention relates to a method for extracting lithium from an alumina production process and preparing battery-grade lithium carbonate. The method comprises the following steps of: cooling a refined solution, and carrying out a reaction with an acidic compound to prepare an aluminum hydroxide active seed crystal; then, mixing the active seed crystal with a sodium aluminate solution to enrich lithium in the sodium aluminate solution to obtain lithium-rich aluminum hydroxide; mixing the lithium-rich aluminum hydroxide and an organic acid to carry out a microwave desorption reaction, and carrying out solid-liquid separation after the reaction is completed, wherein the solid is lithium-free aluminum hydroxide and the liquid is lithium-rich desorption liquid; adding alkali liquor to the lithium-rich desorption solution to adjust the pH value, and adding a lithium purification inhibition agent to remove aluminum ions, iron ions, calcium ions and magnesium ions to obtain a lithium-rich refined solution; and adding a saturated sodium carbonate solution to the lithium-rich refined solution to precipitate lithium to obtain crude lithium carbonate, and repeatedly the washing crude lithiumcarbonate with high-purity water to obtain the battery-grade lithium carbonate. The method realizes high-efficiency high-quality extraction of lithium in the alumina production process, and is in seamless connection with the existing alumina production process. The method has a simple process and low production cost and is suitable for industrial promotion.

The invention provides a Li-Ti3C2-rGO composite thin film material and a preparation scheme thereof. The Li-Ti3C2-rGO composite thin film material is prepared by the following steps that step 1, a GOdispersion solution and a Ti3C2 dispersion solution are prepared, the concentration of the GO dispersion solution and the Ti3C2 dispersion solution is 1-4mg/mL, after the GO dispersion solution and the Ti3C2 dispersion solution are mixed, stirring is carried out, and then ultrasonic treatment is carried out; step 2, the solution obtained in the step 1 is subjected to vacuum filtration in batches;step 3, a Ti3C2-GO thin film filtered by the step 2 is subjected to air drying naturally, a contact heat table is torn off from the filter film, so that the Ti3C2-GO thin film becomes a multihole Ti3C2-rGO thin film; and step 4, the multihole Ti3C2-rGO thin film in the step 3 is in contact with a molten lithium metal. According to the thin film prepared by the preparation scheme, the electrode hasgood flexibility, and is very useful for wearable electrode design; and the uniform and rapid combination of the lithium metal with the composite material can be realized, the lithium content of thethin film material is high, and the superstrong protection for the lithium metal can be realized.

The invention discloses a glass material and a preparation method and a product thereof. The glass material contains a lithium salt crystal phase and a phosphate crystal phase, the crystallinity of the whole material is 40-95%, the lithium salt crystal phase accounts for 40-90 wt%, the phosphate crystal phase accounts for 2-15 wt%, the lithium salt crystal phase is one or more of lithium silicate, lithium disilicate and petalite, and the phosphate crystal phase is aluminum phosphate or/and aluminum metaphosphate. The glass material has a Vickers hardness (Hv) of 900 kgf/mm<2> or more after tempering. The glass material or the substrate provided by the invention is suitable for protective members of mobile terminal equipment, optical equipment and the like, and has high hardness and strength. In addition, the material can also be used for outer frame members of portable electronic equipment and other decorations.

The invention discloses a method for recovering lithium from a waste lithium ion battery. The method comprises the following steps: discharging the waste lithium ion battery, cutting a positive plate obtained by disassembling the waste lithium ion battery into blocks, soaking the blocks in a mixed solution of N-methyl pyrrolidone and dimethylacetamide, adding a mixed solution of orange juice and water, stirring, carrying out ultrasonic treatment, picking out an aluminum foil, filtering and drying to obtain a positive active material, uniformly mixing with a citric acid, roasting, uniformly mixing with sodium citrate, roasting, mixing with sodium hydroxide and sodium persulfate, and carrying out microwave roasting; leaching the roasted product in water, carrying out solid-liquid separation to obtain a filtrate A, adjusting the pH value of the filtrate A to be neutral, filtering, adding sodium sulfide, adjusting the pH value to be 8-10, stirring, and carrying out solid-liquid separation to obtain a filtrate B; and adjusting the pH value of the filtrate B to 2-3, mixing the filtrate B with a mixture of 1-carboxymethyl-3-methylimidazolium hexafluorophosphate, the acetic acid and tributyl phosphate, stirring at a room temperature for 10-35 minutes, and centrifuging. The method provided by the invention is simple and feasible in process, high in lithium ion recovery rate and good in purity.

The invention provides a method for preparing a lithium ionic sieve adsorbent. The method comprises the following steps: co-acting a raw material which is an aqueous solution of a lithium salt and a manganese salt by microwaves and ultrasonic waves to obtain a co-precipitation product, calcining the co-precipitation product to obtain a lithium ionic sieve precursor, and carrying out acid leachingon the lithium ionic sieve precursor to obtain the lithium ionic sieve adsorbent. The lithium salt and manganese salt mixed aqueous solution is used as the raw material, and precipitates under the co-action of the microwaves and the ultrasonic waves, the precipitate is calcined to obtain the lithium ionic sieve precursor with an ideal structure, a high purity and a high lithium content, and the lithium ionic sieve precursor is processed to obtain the lithium ionic sieve adsorbent. The lithium ionic sieve adsorbent has the advantages of stable structure and high adsorption capacity, and the method has the advantages of short time, low energy consumption and high controllability, and is of great significance to recycling lithium metal resources.

The invention discloses a high-lithium-content high-molecular-weight lithium acrylate emulsion and a preparation method and application thereof in a lithium battery, and the method comprises the following steps: carrying out polymerization reaction on a polymer monomer in an organic solvent in the presence of an initiator to obtain solvent-type acrylate resin, wherein the composition of the polymer monomer is controlled such that the theoretical glass transition temperature of the solvent-based acrylate resin is-12 DEG C to 25 DEG C; and removing the organic solvent in the solvent-type acrylate resin, and adding a lithium hydroxide aqueous solution into the solvent-type acrylate resin at the same time, so as to obtain the lithium acrylate emulsion. The lithium content of the lithium acrylate emulsion can reach 5%, the molecular weight can reach 500,000, and the electrochemical performance of a lithium battery can be remarkably improved.

A method for making lithium aluminide compound with high lithium content is disclosed. The method includes applying an electrolyte composed of lithium chloride, potassium chloride, and calcium chloride to accomplish a diffusive electrolysis under 380˜550° C. temperature. The lithium atoms of the electrolyte are reduced and diffused into an aluminum cathode, and liquid lithium aluminide is formed and floats on the electrolyte. The liquid lithium aluminide is further scooped up from the upper electrolyte and solidified to a lithium aluminide compound with 40˜62 wt % lithium content.

The invention relates to the technical field of molecular sieves, and particularly discloses a lithium-based molecular sieve with an oxygen production function and a preparation method and production equipment thereof. The lithium-based molecular sieve with the oxygen generation function is prepared from the following raw material components in parts by weight: 30 to 50 parts of lithium hydroxide, 40 to 60 parts of kaolin, 60 to 80 parts of silica sol, 15 to 25 parts of alpha-linolenic acid and 15 to 25 parts of gamma-aminopropyltriethoxysilane. The invention relates to a preparation method of a lithium-based molecular sieve with an oxygen generation function, which comprises the following steps: uniformly mixing lithium hydroxide and kaolin, and heating at 200-250 DEG C for 40-80 minutes to obtain a mixture A; uniformly mixing the mixture A, deionized water, silica sol, alpha-linolenic acid and gamma-aminopropyltriethoxysilane, reacting at 150-170 DEG C to obtain a mixture B, performing suction filtration, washing a suction filtration product to be neutral, and drying to obtain a mixture C; and roasting to obtain the lithium-based molecular sieve.

The invention discloses surface deliquescence-resistant aluminum-lithium-based ternary alloy powder as well as a preparation method and a system of the surface deliquescence-resistant aluminum-lithium-based ternary alloy powder. The ternary alloy powder comprises aluminum, lithium and zinc, and the mass content of the aluminum is 70%-98%; the mass content of lithium is 1-20%, and the mass content of zinc is 1-10%. The preparation method comprises the steps that under the argon positive pressure condition, metal containing aluminum and lithium is smelted in a silicon carbide crucible smelting furnace, an aluminum-lithium binary alloy ingot is obtained, then the aluminum-lithium binary alloy ingot, aluminum and zinc are smelted in the silicon carbide crucible smelting furnace, an aluminum-lithium-zinc ternary alloy feed liquid is obtained, the aluminum-lithium-zinc ternary alloy feed liquid is conveyed to an atomization tank through a niobium alloy pipeline, and the atomization tank is used for atomization. And carrying out disc type centrifugal atomization and screening to obtain the surface deliquescence-resistant aluminum-lithium-based ternary alloy powder. The surface of the prepared aluminum-lithium-based ternary alloy powder has the characteristics of corrosion resistance and deliquescence resistance, and high activity and stability can be kept under common storage conditions.