322results about "Lithium halides" patented technology

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention provides a boron gradient-doped positive electrode precursor and a preparation method thereof, a positive electrode material and a battery. The positive electrode precursor comprises a boron-doped ternary material core and a boron-doped ternary material layer coated outside the boron-doped ternary material core, the mass fraction of the boron element in the boron-doped ternary material core is lower than that of the boron element in the boron-doped ternary material layer. In the boron gradient-doped positive electrode precursor provided by the invention, boron doping is performed in the boron-doped ternary material core and the boron-doped ternary material layer, so that a B-O bond with relatively high bond energy is formed, and lattice stress accumulation in the positive electrode precursor is reduced, thereby improving the structural stability and thermal stability of the positive electrode precursor and the positive electrode material; in addition, through gradient doping of boron, the electrochemical performance of the positive electrode material is ensured, the surface and interface structure of the positive electrode precursor is strengthened, the expansion of cracks is inhibited, and the structural stability of the positive electrode precursor is improved.

The present invention provides a method for producing lithium hydroxide, comprising the steps of reacting lithium carbonate and calcium hydroxide in a liquid to obtain a solution containing lithium hydroxide, and performing solid-liquid separation on the solution into a liquid component containing lithium hydroxide and a solid component containing lithium derived from the lithium carbonate, and recovering lithium hydroxide from the liquid component.

The invention discloses a method for circularly leaching lithium iron phosphate mixed powder from ferric salt and recovering all components, and belongs to the field of battery recovery. The method comprises the following steps: leaching mixed powder by adopting an iron salt solution to obtain a lithium-containing leaching solution and leaching residues; ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, the ferric iron is cyclically used for leaching the next batch of mixed powder, after the preset cycle number is reached, the leachate is used for re-leaching treatment of multiple batches of leaching residues, and the lithium leaching rate is increased. And finally obtaining enriched liquid containing Li, Fe, Cu and Al and iron phosphate slag containing graphite. And replacing the enriched liquid with iron powder to recover copper, extracting and separating to obtain a high-purity lithium chloride solution, and simultaneously recovering ferric chloride (recycling) and aluminum chloride crystals. And treating the leaching residues with hydrochloric acid to obtain regenerated graphite, and adjusting the pH value with alkali to obtain high-purity iron phosphate. According to the method, all-component recovery is achieved under the mild condition, separation steps are reduced through a leaching-regeneration-leaching circulation mechanism, chemical consumption is reduced, and the method has both environmental and economic benefits.

The invention relates to a surface-modified co-doped lithium-rich manganese-based positive electrode material and a preparation method thereof. The surface-modified co-doped lithium-rich manganese-based positive electrode material comprises a bulk phase part and a surface part, the bulk phase part is a cation co-doped lithium-rich manganese-based material, the chemical formula is Li < 1.2 > Ni < 0.17 > Co < 0.16-x > M < x > Ru < y > Mn < 0.47-y > O < 2 >, in the formula, M is at least one of V, Cr and Fe, x is more than or equal to 0.06 and less than or equal to 0.14, and y is more than or equal to 0.05 and less than or equal to 0.2; the surface part is a selenium-halogen composite modified layer coating the bulk phase part in situ, contains selenide and lithium halide, and is formed by heat treatment of a bulk phase material, a selenium source and a halogen source in an inert atmosphere. The positive electrode material provided by the invention has excellent structural stability and high lithium ion diffusion coefficient, has good interface compatibility with halide electrolyte, and has high energy density and long cycle stability when being used in a halide all-solid-state battery.

The present invention provides a method for recovering lithium and iron phosphate from waste lithium iron phosphate. The method comprises: providing a crude lithium iron phosphate residue; formulating the crude lithium iron phosphate residue into a slurry, and introducing Cl2 gas into the slurry, while adding FeCl3 as a catalyst, to carry out a catalytic oxidation lithium extraction reaction; filtering the reacted slurry to obtain a lithium-containing filtrate and a crude iron phosphate filter residue; crystallizing lithium chloride from the lithium-containing filtrate to obtain purified lithium chloride; subjecting the crude iron phosphate filter residue to acid leaching, followed by filtration to obtain an iron phosphate precursor; and calcining the iron phosphate precursor to obtain iron phosphate. The method of the present invention enables full-element recovery of lithium iron phosphate from waste lithium iron phosphate, and can improve the energy utilization rate.

The embodiment of the invention provides a halide electrolyte with a core-shell structure, a preparation method and a solid-state battery. The halide electrolyte with the core-shell structure comprises an inner core and a coating layer coating the surface of the inner core. Wherein the inner core is a crystalline halide electrolyte, the coating layer is an amorphous sulfide electrolyte, and the amorphous sulfide electrolyte comprises LiBr, LiI and Li3PS4. According to the scheme, the conductivity and the air stability of the halide electrolyte with the core-shell structure are effectively improved.

The invention provides a lithium ion battery negative electrode material as well as a preparation method and application thereof. The lithium ion battery negative electrode material is a porous silicon carbon material coated with lithium phosphate. The preparation method is simple and efficient, lithium phosphate salt is uniformly distributed on the surface of the porous silicon carbon material through solvent wet coating, the lithium phosphate salt is decomposed into LiF and LixPyOz through sintering and heating, and LiF and LixPyOz coating layers are generated in situ on the surface of the porous silicon carbon negative electrode material of the lithium ion battery, so that the porous silicon carbon material uniformly coated with LiF and LixPyOz is obtained, the advantages of LiF and LixPyOz are combined, and the porous silicon carbon material has the advantages that the porous silicon carbon material can be used for preparing the lithium ion battery negative electrode material through cooperation of LiF and LixPyOz; the silicon-carbon material prepared by the method has the characteristics of high strength, high stability and high ionic conductivity, can effectively inhibit volume expansion of the silicon-carbon material in the charge-discharge process, block penetration of electrons and reduce capacity loss of the silicon-carbon material in the reaction process, is used for manufacturing a lithium ion battery and remarkably improves the cycling stability of the battery.

The invention pertains to a recycling process of a material comprising a halide solid electrolyte (HSE) of formula (I) M3-z(Mek+)fX3-z+k*f, said process comprising successively: a) adding at least one ammonium salt of X' to a solution comprising the HSE, wherein X and X' are halogens, in particular independently chosen from Cl, Br, I and any combination thereof; b) filtering and evaporating the solution obtained in step a) to obtain a dry powder; c) heating the dry powder obtained in step b), and d) obtaining a recycled HSE of formula (I). The invention further concerns a cathode composite and an electrolyte comprising a recycled HSE obtained from the recycling process according to the invention and an all-solid-state battery comprising such a cathode composite and / or electrolyte.

The present invention relates to a method for improving the yield of a lithium solution through concentration and crystallization, and, more specifically, to improving the yield of a lithium solution by reacting a low-concentration lithium solution with a fluorine compound so as to prepare lithium fluoride, and then concentrating and crystallizing a filtrate.

The present invention relates to an apparatus for manufacturing lithium chloride and a method for manufacturing the same, and the apparatus for manufacturing lithium chloride includes: a hopper for supplying a lithium compound and a reducing agent; a selective chlorinator connected to a lower part of the hopper to receive chloride and induce a chlorination reaction; and an extractor connected to the top of the selective chlorinator to extract lithium chloride produced by the chlorination reaction, wherein the amount of residual Li in the lithium compound can be 15 wt% or less.

The invention provides spodumene impurity residue removal lithium extraction equipment and a lithium chloride and magnesium oxide preparation process, and relates to the technical field of solid waste treatment, the spodumene impurity residue removal lithium extraction equipment comprises a water bath extraction box, a first mounting plate, a second mounting plate, a reciprocating mechanism and a stirring mechanism; a first mounting plate and a second mounting plate are respectively mounted at the top of the water bath extraction box, the reciprocating mechanism comprises a motor mounted at the top of the first mounting plate, an output shaft key slot of the motor is connected with a turntable, and a limiting frame is fixedly arranged at the bottom of the first mounting plate. According to the scheme, the reciprocating mechanism is matched with the stirring mechanism to rotate in a reciprocating manner, so that the lithium dissolution and separation rate can be increased, a local dead zone formed by single stirring can be broken through the compound motion of reciprocating rotation and stirring, a lithium-containing filtrate forms a strong turbulence and shear effect in the water bath extraction box, updating of a surface leaching agent can be accelerated, and the extraction efficiency is improved. The diffusion resistance of lithium ions on a solid-liquid interface is reduced, so that the dissolution rate of lithium from a solid state to a solution is remarkably increased, and the overall extraction period is shortened.

Lithium oxide argyrodites having the formula Li(6−y)PS4O(1−y)X(1+y) where X is a halide anion and y is a number between 0 and 0.8, inclusive, are provided herein. Also provided are methods of synthesizing the lithium oxide argyrodites and composites including the lithium oxide argyrodites, as well as other alkali metal oxide argyrodites and related methods and composites.

Disclosed are sorbent compositions for direct lithium extraction (DLE). The sorbent compositions include a lithiated aluminum component and an inorganic binder, and are in the form of shaped particles. The lithiated aluminum component makes up about 50% w / w to about 90% w / w of the sorbent compositions, whereas the binder makes up about 10% w / w to about 50% w / w of the sorbent compositions. Processes for producing the sorbent compositions are also provided, as are methods of using the sorbent compositions for DLE.

The invention discloses a bifunctional ionic liquid as well as a preparation method and application thereof, and belongs to the technical field of lithium resource extraction and hydrometallurgy. According to the invention, the dual-functional ionic liquid is prepared, and the dual-functional ionic liquid can be used for synchronously realizing efficient extraction of lithium ions from the lepidolite acid leaching solution and synergic deep removal of fluorine and chlorine, so that the limitation and defects of a traditional solvent extraction agent are effectively overcome; the problems that an existing lepidolite lithium extraction technology is long in process, low in separation efficiency and serious in equipment corrosion can be solved.

The application discloses a pyrite-based composite positive electrode material, a preparation method thereof and application of the pyrite-based composite positive electrode material in a full-solid-state battery, and relates to the technical field of battery materials. The preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) performing shock ball milling treatment on pyrite block crystals to obtain iron sulfide powder; (2) mixing lithium sulfide and lithium iodide, and then performing high-energy ball milling treatment to obtain a lithium iodine sulfur amorphous mixture; and (3) mixing the iron sulfide powder and the lithium iodine sulfur amorphous mixture, and then performing high-energy ball milling treatment to obtain the pyrite-based composite positive electrode material. The pyrite-based composite positive electrode material is combined with a solid electrolyte membrane and a lithium indium negative electrode, and a pyrite composite positive electrode sulfide full-solid-state battery with high capacity and low attenuation can be prepared, and the pyrite composite positive electrode sulfide full-solid-state battery exhibits high specific capacity and long cycle performance.

The present application relates to a kind of method and device for producing lithium chloride using dust and lithium ore, belong to dust and sludge treatment and lithium ore lithium extraction technical field of steel enterprise.The method comprises the following steps: after lithium ore is ground, mixed sintering machine head dust and binder are added, and after adjusting the moisture content of mixed material, the mixed material is pressed ball or disc balling, the green ball is dried and then roasted, zinc, lead, lithium, potassium, rubidium, cesium in the mixture are converted into gaseous chlorides or oxides, and then collected and separated to obtain zinc, lead, lithium and other compound products.The device includes mixer, balling machine, dryer, reduction roaster and dust collector in sequence along the material transport direction.Dust is difficult to use in steel plant, and the alkali metals, zinc, lead and other elements contained therein can adversely affect blast furnace smelting, but these elements are exactly the necessary raw materials for lithium chloride extraction from lithium ore.The present application can extract and separate lithium from lithium ore, and also can simultaneously treat dust and sludge solid waste that cannot be digested and treated in steel plant.

This invention relates to the field of lithium extraction from lithium precipitated mother liquor, and provides a method for preparing battery-grade lithium chloride from lithium precipitated mother liquor, comprising: S1 cooling the lithium precipitated mother liquor and then performing precision filtration to remove solid particles; S2 adding a crown ether additive to the lithium precipitated mother liquor after filtration in step S1 to obtain a pretreated mother liquor; S3 performing multi-stage extraction on the pretreated mother liquor using a lithium extractant to obtain a loaded organic phase; S4 first performing multi-stage washing on the loaded organic phase with a mixed washing liquid, and then back-extracting to obtain a lithium chloride solution; S5 sequentially subjecting the lithium chloride solution to resin adsorption for oil removal and evaporation crystallization to obtain a battery-grade lithium chloride product. This method reduces sodium activity from the source by adding a crown ether additive in the extraction stage to reduce sodium co-extraction, and simultaneously adds a sodium replacement additive in the washing stage to chemically complex residual sodium ions to improve the efficiency of single-stage washing, thereby reducing the number of extraction stages and washing stages, significantly reducing equipment investment and operating costs compared to traditional processes.

The invention belongs to the technical field of lithium salt purification, and discloses a lithium extraction method and a lithium extraction device. The method comprises the following steps: providing a lithium-containing mixed salt; contacting the lithium-containing mixed salt with an organic solvent to form an organic solution rich in lithium salt and a mixed system containing an undissolved sodium salt solid; and carrying out interface evaporation on the mixed system to remove part of the organic solvent and promote the precipitation of the sodium salt, and enriching the lithium salt in the residual liquid phase to realize the separation of the lithium salt and the sodium salt. The method provided by the invention can realize high-efficiency and high-selectivity separation of the lithium salt and the sodium salt.

Methods for concentrating brine comprising: introducing an input brine to a first hydrate column, wherein the input brine comprises a lithium ion and water; introducing an input gas to the input brine within the first hydrate column; forming a gas hydrate with the water and the gas; concentrating the input brine, due to formation of the gas hydrate with the water, to form a concentrated brine; and extracting, from the first hydrate column, the concentrated brine.

The embodiment of the invention provides a preparation method of a halide electrolyte and a solid-state battery, and the method comprises the following steps: weighing raw materials according to the components shown in the chemical general formula of the halide electrolyte and the molar ratio, and then mixing the raw materials to obtain first precursor powder; then pre-sintering the first precursor powder in an inert atmosphere to obtain a first reactant; and finally, carrying out heat treatment on the first reactant in an inert atmosphere to obtain the halide electrolyte. The method is used for achieving the technical effect of improving the ionic conductivity of the prepared halide electrolyte.

Embodiments herein relate to recycling of used lithium battery materials. In some aspects, a method may include suspending a lithium source in a solvent containing an oxidizing agent to extract lithium, forming an extracted lithium solution, separating the extracted lithium solution from residual solids of the lithium source, purifying the extracted lithium solution by precipitating and filtering impurities, and precipitating lithium in the purified lithium solution to produce lithium carbonate (Li2CO3). In some embodiments, the method may also include pre-treating the lithium source to improve the kinetics of the lithium extraction. In some embodiments, the pretreatment may include a cutting or comminution step to reduce the size of the lithium source. In some embodiments, the lithium source may include lithium ion battery waste. In some embodiments, the oxidizing agent may include sodium persulfate (Na2S2O8), potassium persulfate ((NH4) 2S2O8), ammonium persulfate (NH4) 2S2O8, hydrogen peroxide (H2O2), ozone (O3), and / or nitrous oxide (N2O).

The application provides a method for separating lithium salt and carbonate organic solvent from lithium battery waste electrolyte, belongs to the technical field of waste liquid comprehensive utilization, and is used for lithium ion battery production and lithium battery recycling processes, wherein part of waste electrolyte is generated, mainly containing carbonate organic solvent and lithium salt; the application first separates the carbonate and lithium salt by adopting thin film evaporation; after neutralization, the light component carbonate solvent enters a rectification system to realize the separation of carbonates, and various carbonate products meeting the national standard requirements are obtained; after high-temperature incineration cracking and removal of residual organic impurities, the heavy component lithium salt is recycled in the form of lithium fluoride; the process realizes comprehensive utilization of the waste electrolyte, and avoids waste of lithium elements and carbonate solvents.

The invention provides a lithium source eutectic mixture, a positive electrode material, preparation methods of the lithium source eutectic mixture and the positive electrode material, a positive electrode plate and a lithium ion battery. The lithium source eutectic mixture comprises a first lithium compound and a second lithium compound, wherein the melting point of the first lithium compound is smaller than that of the second lithium compound; according to the embodiment of the invention, the second lithium compound with a lower melting point is added into the first lithium compound, and compared with a single lithium compound, the lithium source eutectic mixture reduces the melting point of the lithium source phase, so that a liquid phase is rapidly generated during sintering, and rapid diffusion of lithium ions is accelerated; moreover, the liquid phase is beneficial to wrapping other components, promoting the uniformity of the reaction and improving the compactness of the lithium source eutectic mixture, so that the sintering temperature is reduced, and the influence on the electrical property of the positive electrode material is reduced.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive electrode lithium supplementing material, a preparation method and a lithium ion battery, the positive electrode lithium supplementing material is of a core-shell structure, and comprises an inner core, a middle layer and a shell; the inner core is lithium-rich lithium ferrite doped with cations, and the cations are Ti, Mg, Al, Zr or Ta; the shell is a coating layer formed by halogen and Li, and the halogen is one or more of F and Cl; the preparation method of the positive electrode lithium supplementing material comprises the following steps: in an inert atmosphere, heating a precursor, and enabling gas generated by heating to pass through a core material, so as to obtain the positive electrode lithium supplementing material; the precursor is a material capable of generating HF and / or HCl at a high temperature, and the core material is cation-doped lithium-rich lithium ferrite; the gas production rate and the interface impedance can be reduced.

The application belongs to the technical field of lithium ion battery cathode material, and provides a kind of plasma assisted in-situ construction lithium ion conductor coated high nickel ternary cathode material and its preparation method and application.The application forms oxygen plasma active group by high pressure ionization oxygen, the active group generated interacts with the gas generated by the thermal decomposition of the added solid source, can consume high nickel ternary cathode surface residual alkali and form a thin, continuous and dense lithium ion conductor coating layer on the surface of high nickel ternary cathode material in-situ, which helps to promote the development of high nickel ternary cathode material of lithium ion battery.The high nickel ternary cathode material prepared by the application shows high specific capacity, excellent cycle stability, rate performance and first charge-discharge efficiency.At the same time, the preparation method provided by the application is simple, fast, efficient and convenient, and the cost is low, which can effectively remove the residual alkali on the surface of high nickel ternary cathode material and improve the structural stability of high nickel ternary cathode material.

A method for selectively removing sodium or potassium from an alkaline lithium-containing aqueous solution, the method comprising: (i) contacting the alkaline lithium-containing aqueous solution with a hydrophobic solution comprising: (a) an aqueous-insoluble hydrophobic solvent, (b) a protic ionic liquid of the formula X-Y+, wherein X- is a conjugate base of a superacid and Y+ is a protonated cation, and (c) at least one of lipophilic sodium-selective and potassium-selective complexing ligands, wherein the contacting step results in selective complexation with and removal of sodium and / or potassium ions from the lithium-containing aqueous solution into the hydrophobic solution along with simultaneous abstraction of a proton from Y+ to form Y; and (ii) separating the aqueous solution from the hydrophobic solution, wherein, in some embodiments, X- is a bis(sulfonyl)imide and Y+ is a protic ammonium species. The method may further include stripping sodium and potassium ions from the hydrophobic solution and regenerating Y+.

The present disclosure belongs to the technical field of lithium battery recycling, and relates to a lithium extraction method for fire method slag of waste lithium batteries applied to the whole chain integration of lithium batteries. The fire method slag is mixed and heat treated with a mixed inorganic salt type roasting agent and a cation exchange agent. Under the action of high temperature, the silicate structure in the fire method slag can be activated. When the silicate and the roasting agent form a molten salt mixture, ions will diffuse under the driving of a chemical potential gradient, and cations with a large radius can exchange cations with a small radius from the crystal lattice. The cation exchange agent is added for catalysis. Under this condition, lithium ions are converted from insoluble silicate phases into soluble lithium salt phases, so that lithium is recycled through leaching. The method has high conversion rate, simple process and easy industrial production. Strong acid and strong base are not needed in the process, acid and alkali consumption is reduced, acid and alkali waste gas is not generated in the process, environmental protection treatment cost is reduced, and the method is a green and environment-friendly recycling process.

The present invention relates to a method for extracting lithium from one or more lithium-containing batteries, the method comprising a dissolution step, the dissolution step comprising exposing a lithium-containing battery to an acidic leaching solution.

Electrolytic processes are provided for the conversion of lithium carbonate to high purity lithium hydroxide or higher purity lithium carbonate, which involve steps that recycle lithium after electrolysis in order to reduce lithium losses and increase the efficiency of the processes.