464results about "Lithium oxides/hydroxides" patented technology

The invention relates to a method for simultaneously preparing lithium hydroxide and sulfuric acid. The invention provides a method for simultaneously preparing lithium hydroxide and sulfuric acid, which comprises the following steps: preparing a bipolar membrane electrodialysis device which comprises a first bipolar membrane, an anion exchange membrane, a cation exchange membrane and a second bipolar membrane, and forming an acid chamber between the first bipolar membrane and the anion exchange membrane, a salt chamber is formed between the anion exchange membrane and the cation exchange membrane, and an alkali chamber is formed between the cation exchange membrane and the second bipolar membrane; a lithium sulfate aqueous solution is added into a salt chamber of the bipolar membrane electrodialysis device, a sulfuric acid aqueous solution is added into an acid chamber, and a lithium hydroxide aqueous solution is added into an alkali chamber; and discharging the desalted solution formed in the salt chamber of the bipolar membrane electrodialysis device, discharging the sulfuric acid aqueous solution formed in the acid chamber, and discharging the lithium hydroxide aqueous solution formed in the alkali chamber.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

In a method for regenerating a lithium precursor, an electrode active material mixture collected from a lithium secondary battery is prepared. The electrode active material mixture is reduced in a dry rotary heating reactor to form a preliminary precursor mixture. A lithium precursor is selectively recovered from the preliminary precursor mixture. Recovery yield and selectivity can be improved using the dry rotary heating reactor.

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 application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

A method of preparing a cathode active material composition involves combining a first cathode active material including recycled lithium 40 with a second cathode active material 41; wherein the ratio

The invention relates to a resource-saving method for producing alkali-metal-containing cathode active materials, which forgoes the use of additional, purified water through the use of condensate water from the precursors. The invention also relates to the purification of the alkali-metal-containing washing water that arises during the production of cathode active material. According to the invention, alkali-metal precursor recovered in the process is fed back to the production process.

A method for removing calcium in a lithium battery recycling process includes recovering acidic lithium liquid including calcium; adding an oxalate aqueous solution to the acidic lithium liquid as a first calcium removal process; raising the pH of the acidic lithium liquid to prepare an alkaline lithium liquid; and adding ammonium oxalate to the alkaline lithium liquid as a second calcium removal process.

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.

The present invention relates to a process for preparing lithium sulfide (LiS) from lithium hydroxide (LiOH) and hydrogen sulfide (HS), characterized in that the lithium hydroxide is sulfided in a reaction zone (9) comprising at least one moving-bed tubular reactor (9a) with an ascending oscillating spiral configuration, in which the lithium hydroxide (4) circulates countercurrently to an anhydrous gas mixture (10) containing hydrogen sulfide and at least one inert gas.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

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.

When lithium is circulated in the liquid in a series of steps, an increase in the sodium concentration can be effectively suppressed. A method for recovering metals from battery powder of lithium-ion battery waste, the method comprising: an acid leaching step in which metals, including lithium, sodium, and the metal to be separated, in the battery powder are leached into an acidic leaching solution to obtain a metal-containing solution containing the metal; and a metal separation step in which the metal to be separated is separated from the metal-containing solution; the method further comprises a liquid removal step in which, after the metal separation step, lithium in the lithium-containing solution obtained after the metal separation step is returned to the acid leaching step and / or the metal separation step, thereby circulating lithium within a series of steps including the acid leaching step and the metal separation step, and removing a portion of the lithium-containing solution containing sodium.

The invention provides a lithium-rich manganese-based positive electrode material and a preparation method thereof, and a secondary battery, the positive electrode material comprises a spinel phase surface transition layer, the molecular formula of the lithium-rich manganese-based positive electrode material is LixMyAaBbO2, M is Mn, Mn / Ni, Mn / Co or Mn / Ni / Co, A is lithium ion vacancy, B is oxygen ion vacancy, 1lt; xlt; 1, 1.2, 0.8 lt; yt; Yt; 1, 0lt; a < lt >; 0.1, 0 lt; blt; and 0.05%. According to the lithium-rich manganese-based positive electrode material, the preparation method thereof and the secondary battery, the lithium-rich manganese-based positive electrode material is subjected to surface treatment, in-situ construction of a surface buffer layer is realized, the stability of combination with a matrix is improved, and stable material dynamics improvement is realized.

The invention provides a preparation method of lithium hydroxide, and relates to the technical field of salt lake lithium extraction. The preparation method of the lithium hydroxide comprises the following steps: S1, uniformly mixing a nanofiltration concentrated solution with a lithium precipitation mother solution, carrying out heating reaction, and filtering to obtain a mixed solution A; s2, the mixed solution A is subjected to impurity removal through a resin column, and a mixed solution B is obtained; s3, concentrating and crystallizing the mixed solution B to obtain a mixed solution C; s4, adding an acid solution into the mixed solution C to adjust the pH value, and then performing electrodialysis to obtain a mixed solution D; s5, the mixed solution D is subjected to boron removal through a resin column, and a purified solution is obtained; s6, the purified liquid is subjected to bipolar membrane electrodialysis, and a lithium hydroxide solution and an acid solution are obtained; and S7, evaporating, concentrating, crystallizing and centrifuging the lithium hydroxide solution to obtain lithium hydroxide. According to the method, the nanofiltration concentrated liquor and the lithium precipitation mother liquor are used for treating wastes with wastes, so that efficient recovery of lithium and green preparation of lithium hydroxide are realized.

The application provides a method for separating magnesium and lithium in brine, comprising the following steps: pretreating the brine to obtain pretreated brine; performing primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; the nanofiltration membrane selected for the primary nanofiltration is a carboxylated MOF modified nanofiltration membrane; and the raw materials for preparing the carboxylated modified nanofiltration membrane comprise a support, piperazine, carboxylated ZiF-8 and carboxylated Uio-66. The application reduces the risk of nanofiltration membrane pollution by pretreating the brine, pumps the pretreated brine into a nanofiltration system, generates a cut-off liquid rich in magnesium and sulfate ions and a high-lithium permeate liquid, performs secondary nanofiltration on the cut-off liquid to recover lithium, the secondary cut-off liquid can be used as a resource, the permeate liquid enters a reverse osmosis membrane, the lithium content is concentrated, the concentrated lithium liquid enters a lithium precipitation process, and the method for separating magnesium and lithium in the nanofiltration process realizes the impurity removal process for lithium recovery.

The present disclosure is directed to systems and methods of leaching lithium sources using sodium sulfate. The process can include mixing a lithium source, a first sodium sulfate, and lithium hydroxide in a reactor and leaching the lithium source in the mixture in the reactor to form residual solids and a lithium sulfate leachate.

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 discloses a preparation method of an adsorbent and a process method for adsorbing and extracting lithium from oilfield brine, and the preparation method comprises the following steps: dissolving a lithium salt and an aluminum salt in a solvent to prepare a lithium-aluminum mixed solution; dissolving alkali in a solvent to prepare an alkali solution; setting the temperature and the rotating speed of a supergravity reactor, pumping the lithium-aluminum mixed solution and the alkali solution into the supergravity reactor, enabling the obtained product slurry to flow out from an outlet of the supergravity reactor, and adjusting the pH value of the product slurry; filtering, washing and drying the product slurry subjected to pH regulation to obtain aluminum adsorbent powder; and carrying out cross-linking granulation on the aluminum adsorbent powder and a forming agent, and washing to remove lithium to obtain the granular aluminum adsorbent. And an efficient adsorption and desorption process is matched, so that the lithium recovery rate is greater than or equal to 90%, and a battery-grade lithium salt product with a high additional value is obtained. The adsorbent prepared by adopting a supergravity method has the advantages of small particle size and uniform distribution, and the obtained adsorbent is high in lithium adsorption capacity and low in solution loss rate.

The present invention relates to a method for recovering alkali metal ions and hydroxide ions from water being treated, the method including a nanofiltration step in which water being treated is separated using a nanofiltration membrane, the water being treated containing alkali metal ions and polyvalent ions, having a pH of 10 or higher, and having a hydroxide ion concentration (mol / L) lower than the sum of alkali metal ion concentrations (mol / L), the nanofiltration membrane being such that the difference between the glucose removal rate and the isopropyl alcohol removal rate is 40% or greater, the glucose removal rate being 70% or higher, and the magnesium sulfate removal rate being 95% or higher.

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.

The application discloses a method for recycling waste lithium battery positive electrode materials by oxalic acid circulation and lithium hydroxide co-production. The method uses oxalic acid solution to leach the waste lithium battery positive electrode materials, so that the valuable metals are precipitated in the form of oxalate, after solid-liquid separation, the lithium oxalate solution is introduced into an integrated electrochemical recycling system. The system is provided with an ion separation chamber filled with anion exchange resin between the cathode chamber and the anode chamber in the electrolytic cell, which constitutes Li + purifier and H + Traps: the resin fixes oxalate on one hand, promotes Li + dissociation, on the other hand, captures and neutralizes H + migrated from the anode in situ to generate oxalic acid; at the same time, Li + goes through the cathode side cation exchange membrane, and combines with OH ‑ generated by electrolysis to form a lithium hydroxide solution. The regenerated oxalic acid solution can be used for leaching, and the oxalic acid reagent circulation is realized, and the high-purity lithium hydroxide product significantly improves the overall process economy.

The invention belongs to the technical field of lithium salt preparation, and provides a method for preparing battery-grade lithium hydroxide monohydrate by causticizing lithium carbonate. According to the method, raw material washing and ion exchange purification are combined with a multi-stage crystallization impurity removal process including evaporation concentration, rotational flow classification and elutriation to achieve a synergistic effect, so that the impurity content of the product is effectively controlled, and a lithium carbonate component causing scaling is actively removed; therefore, the scaling problem of evaporative crystallization equipment is remarkably relieved while the product purity is improved, and the lithium hydroxide monohydrate meeting the battery-grade quality requirement is stably and continuously produced by taking the industrial-grade lithium carbonate as the raw material.

The application relates to the technical field of lithium hydroxide, and particularly discloses coated modified anhydrous lithium hydroxide and a preparation method thereof. The coated modified anhydrous lithium hydroxide is prepared by the following steps: weighing an internal matrix and an external coating modifier; the internal matrix is anhydrous lithium hydroxide, and the external coating modifier is one of polyaspartic acid, polyacrylamide or polyacrylic acid; the external coating modifier is dissolved in deionized water to prepare a coating modifier solution; the matrix is coated with the coating modifier solution to obtain wet coated modified anhydrous lithium hydroxide; and the wet coated modified anhydrous lithium hydroxide is dried to obtain the coated modified anhydrous lithium hydroxide. The coated modified anhydrous lithium hydroxide has a physical coating layer on the surface of the anhydrous lithium hydroxide, the operation is simple, the particle hardness can be increased, the dust diffusion caused by collision and friction on the particle surface can be effectively reduced, and the dust raising problem is solved. The coated modified anhydrous lithium hydroxide can guarantee the effective absorption agent content and absorption performance, improve the use safety of the lithium hydroxide absorption agent, and meet the requirements of products of the anhydrous lithium hydroxide in multiple fields.

A lithium-ion battery anode material containing surface-coated disordered rocksalt lithium vanadium oxide is disclosed. The surface coating contains a species selected from the group consisting of carbon, a metal oxide, a metalloid oxide, a metal fluoride, a metalloid fluoride, a metal phosphate, a metalloid phosphate, and combinations thereof. Materials, designs, synthesis methods, and devices related to fast-charging lithium-ion batteries are provided. This invention fills a technology gap by providing anode materials with disordered rocksalt lithium vanadium oxides to achieve fast charging in 10 minutes or less, greater than 200 W·h / kg energy density, a lifetime of at least 10,000 cycles, and improved battery safety. Methods of making and using the optionally surface-coated disordered rocksalt lithium vanadium oxide are disclosed. Many experimental examples are included, demonstrating several remarkable attributes of this battery technology.

Materials include phase transition disordered rock salts having an ordered arrangement of partially disordered spinel cations to provide suitable constant current cycling behavior. The phase transition disordered rock salt has the chemical formula LixMnyTMzO2-uFu, where 0.9 < = x < = 1.3, 0 < = y < = 1, 0 < = z < = 0.5, and 0 < = u < = 0.5, and TM is Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb, Mo, Sn, W, or a mixture thereof. Further, the phase transition disordered rock salt includes a first set of domains and a second set of domains interspersed between the first set of domains. The second set of domains is separated from the first set of domains by one or more anti-phase domain boundaries. Methods and systems are described in the present disclosure.

The application relates to the technical field of lithium hydroxide production, and discloses a processing technology for preparing battery-grade lithium hydroxide, which comprises the following steps: lithium ore is crushed to a reasonable particle size and then is sent into a roasting furnace, lithium ore is destroyed through high-temperature roasting, the roasted ore clinker is sent into a reaction kettle, sulfuric acid solution is added to carry out acidification reaction, then water is added to carry out leaching, and a crude leaching solution containing lithium sulfate is obtained. The application is provided with a sealing element, the large contact area design of the L-shaped sealing strip improves the reliability of the primary sealing, the cooperation of the elastic pressing strip and the spring can effectively compensate for the slight deformation in the equipment operation process, the stability of the sealing performance is ensured, the double-sealing structure can effectively prevent the leakage of the heat exchange medium, the problems of resource waste, environmental pollution and equipment damage caused by medium leakage are avoided, the influence of cross contamination of different media on product quality is also avoided.

Described herein are methods of recovering lithium from dilute lithium sources. The methods include extracting lithium from an extraction feed using direct lithium extraction in an extraction stage to yield a lithium intermediate, performing one or more concentration operations, each concentration operation concentrating an input stream to yield an output feed, wherein the input stream is obtained from the lithium intermediate and / or the extraction feed is obtained from the output feed. At least one of the concentration operations includes a membrane separation operation having a plurality of reactors in series each having a semi-permeable membrane, such as a counter-flow reverse osmosis operation. Methods may also include generating a low TDS stream as a permeate from any of the one or more concentration operations, wherein the low TDS stream is recycled or used as fresh water.

The preparation method comprises the following steps: mixing a lithium source material, water, a first solvent and quaternary amine alkali, reacting the quaternary amine alkali with carbon dioxide in a reaction atmosphere containing carbon dioxide to generate HCO3 <->, reacting the HCO3 <-> with lithium ions in the lithium source material to generate lithium bicarbonate, and collecting a water phase after the reaction; decomposing lithium bicarbonate in the water phase to generate lithium carbonate, collecting a solid phase, and decomposing lithium carbonate in the solid phase to generate lithium oxide to obtain an intermediate; dissolving quaternary ammonium iodide in a second solvent, adding the intermediate, converting the lithium oxide into lithium hydroxide, carrying out ion exchange on the lithium hydroxide and the quaternary ammonium iodide to generate lithium iodide, and collecting a liquid phase; and collecting the lithium iodide in the liquid phase. According to the present invention, based on the characteristics of the specific quaternary ammonium base and the quaternary ammonium iodide salt, the Li in the lithium source material is selectively reinforced, carbonized and leached, the anion impurities in the lithium source material are removed, the anion exchange in the organic phase is achieved, and the high-purity anhydrous lithium iodide is prepared.

In this lithium recovery device 1, a processing tank 7 is provided that is partitioned into an acid recovery tank 11, a lithium supply tank 12, an alkali recovery tank 13, and a lithium recovery tank 14, in that order. The lithium recovery tank 14 and the alkali recovery tank 13 are partitioned by a lithium-ion-conducting electrolyte film 2 and the tanks 11, 12, 13 are partitioned by ion exchange films 31, 33. Power sources 51, 52 are respectively provided between electrodes 45, 46 provided within the tanks 13, 14 and between electrodes 41, 44 provided within the tanks 13, 14, the power sources being connected with the lithium recovery tank 14 side as the negative side. The power sources selectively cause Li+ to migrate, from an aqueous solution S0 within the lithium supply tank 12 that contains Li+ and other metal ions Mn+ along with anions such as SO4 2−, to an aqueous solution S3 within the lithium recovery tank 14.