922 results about "Lithium hydroxide" patented technology

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention discloses a method for recovering lithium, nickel cobalt manganese composite hydroxide and aluminum copper powder from a waste ternary lithium ion battery pole piece. The method comprises the following steps: treating waste pole pieces of a ternary plant or a mixture of positive and negative pole pieces by using a Fenton technology, leaching by using a mixed ferric salt solution, and filtering to obtain lithium-containing leachate and slag; adjusting the pH value of the leachate, oxidizing and filtering to obtain a purified solution and ferric hydroxide precipitate, and adding the purified solution and a lithium hydroxide solution into a reactor for coprecipitation to obtain a deeply purified solution and the nickel-cobalt-manganese composite hydroxide. And dissolving the ferric hydroxide precipitate with dilute acid, adding a reducing agent to generate a ferrous salt solution, and returning the ferrous salt solution for Fenton reaction and leaching reaction. And adding the sodium carbonate saturated solution into the deep purification solution, and crystallizing and precipitating to obtain the battery-grade lithium carbonate. And performing hydrodynamic screening on the leaching residues to obtain an aluminum-copper mixture and graphite residues, and performing grinding and specific gravity separation on the aluminum-copper mixture to obtain high-purity aluminum powder and copper powder. According to the method, the iron salt is directly leached from the pole piece, the used iron salt can be recycled, and the method is suitable for large-scale recovery of the waste ternary lithium ion battery.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of high-purity lithium sulfide. Comprising the following steps: putting lithium hydroxide and pure water into a reaction kettle, replacing air in the reaction kettle with nitrogen, starting the reaction kettle, and stirring and heating; introducing quantitative hydrogen sulfide gas from the bottom of the reaction kettle, and circulating the gas in the reaction kettle between liquid in the reaction kettle and a gas space through a gas circulating pump; and after the temperature of the reaction liquid in the kettle is reduced to 20-30 DEG C, filtering in a nitrogen atmosphere, washing the residual solid with quantitative ammonia water, transferring the filtered solid into a drying box, and purging and drying with nitrogen until no water exists, thereby obtaining the high-purity lithium sulfide. In the solvent method, water is used for replacing an organic solvent for reaction, the problems of organic solvent separation and recovery, hazardous waste treatment and the like are avoided, the cost is reduced, and the method is environment-friendly.

The invention relates to the technical field of preparation of lithium battery materials, and discloses a synthesis method of a low-cost battery-grade lithium dihydrogen phosphate raw material lithium phosphate. The synthesis method comprises the following steps: dissolving crude lithium sulfate in alkaline lithium phosphate lithium precipitation mother liquor; carrying out chemical precipitation on the filtered lithium sulfate solution to preliminarily remove calcium, and subsequently, deeply removing calcium and COD (Chemical Oxygen Demand) by sequentially using activated carbon and calcium removal resin to obtain a lithium sulfate finished solution; mixing the lithium sulfate completion liquid and the alkali liquid, freezing to-10 DEG C to-3 DEG C, and performing centrifugal separation to obtain a lithium sulfate freezing liquid; and reacting the refrigerating fluid with a dilute phosphoric acid solution to precipitate lithium phosphate, stirring, washing and centrifuging the filtered crude product lithium phosphate, and drying to obtain the battery-grade lithium dihydrogen phosphate raw material lithium phosphate. The lithium phosphate prepared at low cost is used for replacing battery-grade lithium carbonate, lithium hydroxide and the like as a lithium source for producing the lithium dihydrogen phosphate, so that the production cost of the battery-grade lithium dihydrogen phosphate can be effectively reduced, the lithium phosphate mother liquor is recycled, and the problem of treating a large amount of wastewater caused by other methods is solved.

The invention provides a method for preparing high-purity lithium sulfide from lithium carbonate, and belongs to the technical field of lithium material preparation, and the method comprises the following steps: heating a ball-milled mixture of industrial-grade lithium carbonate and an alumina additive to 750-900 DEG C, and carrying out heat preservation and calcination to generate lithium oxide; performing hydrolysis reaction on lithium oxide in hot water, and filtering to obtain a high-purity lithium hydroxide solution; mixing the lithium hydroxide solution with the sulfur-containing protein, and performing spray drying to obtain a mixed precursor; calcining the mixed precursor at a low temperature of 210-340 DEG C in an inert atmosphere; and heating to 550-660 DEG C, calcining at a high temperature, introducing hydrogen sulfide gas, reacting lithium hydroxide to generate lithium sulfide, and cooling to obtain the high-purity lithium sulfide. The invention provides the method for preparing the high-purity lithium sulfide, the purity, the production efficiency and the raw material utilization rate of the lithium sulfide are remarkably improved, and the technical defects of low purity, incomplete raw material reaction, non-uniform precursor mixing, complicated process, difficulty in large-scale production and the like in the traditional lithium sulfide preparation method are overcome.

A lithium manganese iron phosphate substrate, cathode material, and their preparation method, as well as a lithium battery, belonging to the field of lithium-ion battery technology. The preparation of the lithium manganese iron phosphate substrate comprises the following steps: dissolving soluble ferrous salt, soluble manganese salt, phosphoric acid, and lithium hydroxide in deionized water to react, obtaining Material A; filtering Material A, taking the filter cake and drying it to obtain Material B; Heat treating Material B in an inert gas atmosphere to obtain the lithium manganese iron phosphate substrate. By coating the surface of the carbon-free nano lithium manganese iron phosphate substrate with metal oxides or metal salts and carbon, the coating layer formed on the surface of the composite lithium manganese iron phosphate material effectively prevents the reaction between the lithium battery and the electrolyte.

The invention discloses a production process of high-purity lithium oxide, and relates to the technical field of lithium oxide preparation. The production process of the high-purity lithium oxide comprises the following steps: mixing lithium hydroxide and hydrogen peroxide with the mass concentration of 90-99%, and carrying out peroxidation reaction to obtain a mixture containing lithium peroxide and lithium hydroxide; carrying out solid-liquid separation on the mixture containing the lithium peroxide and the lithium hydroxide to obtain a supernatant containing the lithium hydroxide and a solid containing the lithium peroxide; and carrying out drying treatment on the supernatant containing the lithium hydroxide to obtain the recycled lithium hydroxide, and carrying out thermal decomposition on the solid containing lithium peroxide in an inert gas protective atmosphere to obtain the high-purity lithium oxide powder. According to the technical scheme, the high-purity lithium oxide is prepared by adopting a process of peroxidizing lithium hydroxide into lithium peroxide and then carrying out thermal decomposition, the powder can be obtained without grinding, and the method has the advantages of high production efficiency, low energy consumption and high raw material utilization rate.

The invention relates to the technical field of lithium iron phosphate black powder recovery, in particular to a method for preparing iron phosphate and lithium hydroxide by electrochemically and selectively recovering waste lithium iron phosphate. The method comprises the following steps: separating an anode chamber and a cathode chamber through a cation selective permeable membrane, respectively adding electrolyte into the anode chamber and the cathode chamber, electrolyzing for a period of time to respectively form an acidic environment and an alkaline environment, adding lithium iron phosphate black powder into the anode chamber, selectively leaching lithium into a solution within a proper pH range, and migrating the lithium into the cathode chamber under the action of an electric field, and iron is retained in the solid in the form of iron phosphate, so that lithium-iron separation and lithium ion enrichment can be realized in the leaching process. According to the method, the leaching rate of lithium can reach 99% or above, the leaching rate of iron is kept below 0.01%, the phosphorus iron slag can be restored into an iron phosphate precursor after being calcined, and the enriched lithium liquid is recycled in a high-purity lithium hydroxide form after being evaporated and concentrated. According to the method, electrons are used as a green oxidizing agent, the use of acid and alkali is greatly reduced in the leaching process, and all components are recycled.

To provide a method which enables inexpensive production with a high yield of lithium hydroxide with a low amount of impurities such as sodium from lithium-containing water including a lithium ion and a chloride ion.SOLUTION: A production method of lithium hydroxide includes: a crystallizing step of crystallizing lithium hydroxide (LiOH) from lithium-containing water including a lithium ion and a chloride ion; a solid-liquid separation step of performing solid-liquid separation treatment of concentrated liquid including the LiOH to obtain the LiOH as a solid product and filtrate; a carbonation step of producing lithium carbonate from the filtrate by carbonation; a lithium carbonate recovery step of evaporating at least a part of ammonia from a mixed liquid obtained in the carbonation step and performing solid-liquid separation treatment of the resultant treated liquid to obtain lithium carbonate as a solid product; a lithium hydroxide production step of converting the obtained lithium carbonate into LiOH followed by solid-liquid separation treatment to obtain an aqueous LiOH solution (1) as a liquid component; and a recrystallizing step of crystallizing LiOH from the aqueous solution (1).SELECTED DRAWING: Figure 2

The invention relates to lithium sulfide and a preparation method thereof.The preparation method includes the following steps that sublimed sulfur powder and a lithium source are mixed and subjected to a heating reaction, and the lithium source comprises at least one of anhydrous lithium hydroxide, lithium hydroxide monohydrate, lithium oxide, lithium hydride and lithium carbonate; a reducing gas is introduced while the heating reaction is performed, or the reducing gas is introduced after the heating reaction is finished, and a reduction reaction is performed; and after the reaction is finished, introducing protective gas for calcining to prepare the lithium sulfide. The preparation method provided by the invention can realize low-cost and high-purity production of lithium sulfide, and ensures the safety and environmental protection of the production process.

The invention discloses a lithium iron manganese phosphate precursor and a preparation method and application thereof, and belongs to the technical field of lithium iron manganese phosphate precursors, and the preparation method comprises the following steps: S1, mixing a lithium hydroxide solution, a phosphoric acid solution, a manganese sulfate solution and a ferrous sulfate solution to obtain a first solution; s2, carrying out a hydrothermal reaction on the first solution, adding an MOF mixture to obtain a second solution, and carrying out a secondary hydrothermal reaction on the second solution to obtain a lithium manganese iron phosphate precursor; the MOF mixture comprises an iron-based MOF, a zinc-based MOF and sodium poly (p-styrenesulfonate). According to the preparation method, the micron-sized lithium manganese iron phosphate precursor with relatively high tap density is prepared through the hydrothermal reaction.

The invention relates to an organic eutectic salt modified, regenerated and repaired waste lithium nickel cobalt manganate positive electrode material and a method, and the method comprises the following steps: uniformly mixing the waste lithium nickel cobalt manganate positive electrode material, an aluminum doping source and an organic eutectic salt to obtain mixed powder; the organic eutectic salt is a mixture of lithium hydroxide, lithium nitrate and lithium salicylate; carrying out primary calcination on the mixed powder, cooling, washing and drying to obtain a primary calcined material; and adding a lithium supplement agent into the primary calcined material, uniformly mixing, and carrying out secondary calcination to obtain the regenerated nickel cobalt lithium manganate positive electrode material. According to the method, the characteristics of high lithium ion concentration and low melting point of the organic eutectic salt are utilized, meanwhile, the organic eutectic salt can be used for modifying, regenerating and repairing the waste lithium nickel cobalt manganese oxide positive electrode material under the matching action of the aluminum doping source, and the method is simple, short in process, easy in raw material obtaining and suitable for industrial application; the regeneration effect is excellent, the initial capacity of the regenerated material is high, and the cycling stability is excellent.

Provided is a method with which it is possible to produce a high-purity lithium hydroxide or lithium salt with a high yield in a short time from an aqueous lithium salt solution that has a low lithium concentration. This method for recovering lithium from a low concentration aqueous lithium salt solution comprises: a lithium extraction step for having lithium in the low concentration aqueous lithium salt solution adsorbed onto a lithium adsorbent, and eluting lithium in the lithium adsorbent that has adsorbed lithium by means of a mineral acid, so as to obtain a first aqueous lithium salt solution from the low concentration aqueous lithium salt solution; a purification step for purifying the first aqueous lithium salt solution so as to obtain a third aqueous lithium salt solution; an evaporative concentration step for evaporating and concentrating the third aqueous lithium salt solution so as to obtain a fourth aqueous lithium salt solution; and a membrane electrolysis step for subjecting the fourth aqueous lithium salt solution to membrane electrolysis so as to obtain an aqueous lithium hydroxide solution, a mineral acid, and a fifth aqueous lithium salt solution that is more dilute than the fourth aqueous lithium salt solution.

The invention belongs to the technical field of industrial solid waste resource utilization and high-temperature CO2 adsorption materials, and provides a lithium orthosilicate-based CO2 high-temperature adsorbent prepared on the basis of synergistic treatment and synergism of various industrial wastes, and a method and application of the lithium orthosilicate-based CO2 high-temperature adsorbent. The preparation method comprises the following steps: separating, washing and drying to obtain a SiO2-containing hybrid solid product, mixing the SiO2-containing hybrid solid product with lithium battery derived lithium hydroxide, anhydrous citric acid and deionized water, drying to obtain a lithium silicate precursor, and finally roasting to obtain the lithium orthosilicate-based CO2 high-temperature adsorbent. Under the condition that the temperature window is 650-720 DEG C, the adsorption capacity of the adsorbent for high-concentration carbon dioxide can reach 18% or above, and part of the temperature can reach 30% or above. Most of the raw materials are selected from industrial wastes, and the preparation method has the characteristics of low cost and suitability for continuous production of process steps, and has industrial production prospects.

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 preparation method of an oxychloride electrolyte material, the oxychloride electrolyte material and an all-solid-state battery, and the method comprises the following steps: providing raw materials; the raw materials comprise metal chloride and lithium hydroxide; and reacting the metal chloride in the raw material with lithium hydroxide in an inert gas atmosphere to obtain the oxychloride electrolyte material generated by the reaction. Lithium hydroxide is used as a lithium raw material, the price is low, the preparation cost is reduced, hydrogen chloride is generated in the mixing preparation process, an acidic catalysis environment is provided, and the preparation time is shortened; an oxygen element and a chlorine element are introduced into the prepared oxychloride electrolyte material, an oxygen-chlorine frame structure formed by the oxygen element and the chlorine element is an obvious flexible ion frame structure, and the ion frame structure reduces the diffusion activation energy of lithium ions, so that the room-temperature ion conductivity of the oxychloride electrolyte material is improved.

To provide a method for yielding a lithium-containing liquid suitable as a raw material for producing lithium compounds of high purity, from to-be-treated water containing lithium ions, sodium ions, metal ions other than lithium ions and sodium ions, fluoride ions, and anions serving as conjugate bases of acids, and to provide related techniques thereof.SOLUTION: Provided is a method for producing a raw material liquid for a lithium compound, comprising: step 1 of adding a sulfiding agent and a calcium compound to the to-be-treated water, subjecting the to-be-treated water containing the formed solid matter to solid-liquid separation to obtain a treated liquid A; step 2 of adding an oxalate ion source to the treated liquid A, subjecting the treated liquid A containing the formed solid matter to solid-liquid separation to obtain a treated liquid B; and step 3 of subjecting the treated liquid B to bipolar electrodialysis to obtain an alkaline liquid containing lithium ions and sodium ions as a raw material liquid for producing a lithium compound.SELECTED DRAWING: None

The present invention provides a method for preparing lithium sulfide and lithium sulfide, so as to prepare a high-purity lithium sulfide without increasing the purification cost. The method includes: keeping thiourea and lithium hydroxide warm under a first condition to obtain a mixture; wherein, the first condition includes a heat preservation temperature of 130-180 °C; reacting the mixture with hydrogen sulfide under a second condition to obtain lithium sulfide; wherein, the second condition includes a temperature condition of 500-760 °C.

The invention discloses a method for converting lithium hydroxide into lithium carbonate. The method comprises the following steps: S1, preparing or taking a lithium hydroxide solution and a carbonate solution; s2, putting the lithium hydroxide solution and the carbonate solution into electrodialysis equipment, and carrying out electrodialysis treatment; and S3, after electrodialysis is finished, collecting a lithium carbonate solution, and sequentially carrying out lithium precipitation and solid-liquid separation on the lithium carbonate solution to obtain the battery-grade lithium carbonate. According to the method for converting lithium hydroxide into lithium carbonate disclosed by the invention, CO2 is replaced by carbonate, so that the generation of lithium bicarbonate is avoided, the lithium carbonate and the byproduct alkali liquor are directly obtained, the raw material source is wide, the preparation condition is mild, the production cost is greatly reduced, and the method has huge potential economic benefits.

The invention provides a phosphate and polyethylene oxide modified silicon-based double-layer negative electrode material and a preparation method thereof. The negative electrode material is of a modified silicon and graphite double-layer structure, a modified silicon material layer is arranged on the surface of a copper current collector, and a graphite layer is arranged on the surface of the modified silicon material. The preparation method of the modified silicon material comprises the following steps: (1) carrying out ball milling on silicon powder, lithium hydroxide and ammonium dihydrogen phosphate to prepare lithium phosphate modified silicon powder; (2) stirring and sintering the modified silicon powder and glucose to obtain a carbon-coated modified silicon material; and (3) mixing the modified silicon powder with polyethylene oxide to prepare slurry, and coating the slurry on a current collector to obtain the modified silicon material layer. The preparation method of the graphite material comprises the following steps: mixing graphite powder and polyethylene oxide to prepare slurry, and coating the slurry on the surface of the modified silicon material layer to obtain the silicon-based double-layer negative electrode material. According to the silicon-based double-layer negative electrode material disclosed by the invention, inorganic and organic modified materials are introduced, so that the silicon-based double-layer negative electrode material has high electronic conductivity and ionic conductivity, meanwhile, the stability of the silicon-based negative electrode material is improved to a certain extent by adding a graphite double-layer structure, and a half battery assembled by the material has good cycle performance and rate capability.

The invention discloses a method for preparing a battery-grade lithium compound. The method comprises the following steps: S1, carrying out sulfuric acid acidification reaction on a lithium-containing raw material or roasting by adding sulfate, and carrying out water leaching to obtain leached slurry; the lithium-containing raw material is a lithium mineral or a waste lithium battery material; s2, calcium oxide or calcium hydroxide is added into the leaching slurry, filtering is performed after full reaction, filtrate A and filter residues A are obtained, the main component of the filtrate A is lithium hydroxide, and the filtrate A further comprises soluble impurities formed after water leaching; s3, adding a substance for removing calcium ions into the filtrate A, fully reacting, and filtering to obtain filtrate B and filter residues B; s4, fully contacting the filtrate B with an extracting agent for extraction, and then separating to obtain a loaded organic phase and raffinate; s5, reversely extracting the loaded organic phase to obtain a lithium solution and a blank organic phase; and S6, further treating the lithium solution to obtain the battery-grade lithium compound. Sodium ions are basically not introduced, the energy consumption is low, the process is simplified, the product quality is high, the production cost is low, the lithium yield is high, and byproducts are convenient to treat.

The present invention relates to a method for preparing lithium sulfide, according to the present invention, when preparing lithium sulfide by a reaction between a lithium raw material and hydrogen sulfide, the reaction is carried out under relatively mild conditions compared to the prior art, so that frequent maintenance or replacement due to corrosion and failure of a reactor and various pipes is not required, thereby improving the economical efficiency of the process. Further, by reusing the unreacted hydrogen sulfide from which moisture has been removed and the solvent, process costs can be reduced, and economical efficiency can be ensured during mass production. Furthermore, moisture and water vapor generated in the lithium sulfide generation reaction are effectively removed, thereby preventing a reverse reaction for generating lithium hydroxide, promoting a positive reaction, and producing high-quality lithium sulfide with high purity and high yield. In addition, the particle size can be adjusted in units, and a separate pulverizing space or pulverizing table is not required, so that convenience and mass productivity are excellent.

The invention relates to the technical field of lithium ion batteries, in particular to a starch-based hard carbon negative electrode material, a preparation method thereof and a lithium ion battery, and the preparation method comprises the following steps: mixing a polyvinyl alcohol solution with a lithium hydroxide solution, adding starch, stirring, and adding halogenated acid for reaction to obtain a reaction mixture; dropwise injecting the reaction mixture into a liquid nitrogen bath to prepare a spherical precursor; and calcining the spherical precursor in an inert gas atmosphere to obtain the starch-based hard carbon negative electrode material. According to the invention, polyvinyl alcohol is used as a self-sacrifice template, so that the subsequent step of removing the template is reduced, procedures and energy consumption are reduced, generation of a porous structure in the hard carbon negative electrode material is facilitated, and regulation and control of the porous structure are facilitated; meanwhile, lithium halide generated in situ in the starch is combined as lithium supplement salt, so that the porous carbon negative electrode material with excellent electrochemical performance is prepared while the preparation steps are simplified.

The invention relates to a lithium ion conductive dense membrane and a preparation method and application thereof. The lithium ion conductive dense membrane comprises a polymer base membrane, ion conductive inorganic particles and a polymer solid electrolyte, the polymer base membrane is of a net structure; the Gurley value of the lithium ion conductive dense film is larger than or equal to 1000, and the porosity is smaller than or equal to 5%. The lithium ion conductive dense membrane provided by the invention has the advantages of high lithium ion conductivity, high transport efficiency and high lithium ion selectivity, and can be applied to electrodialysis lithium extraction. And under the action of external voltage, lithium ions are directionally migrated to the air negative electrode subjected to oxygen reduction reaction through the lithium ion conductive dense membrane to form a lithium hydroxide solution, and other metal hetero-ions are isolated on the positive electrode side by the lithium ion conductive dense membrane, so that lithium enrichment is realized. And meanwhile, transportation of the membrane to lithium ions does not depend on pores in the conductive membrane, so that the service life can be prolonged while the lithium ion separability and the transportation efficiency of the salt lake lithium extraction method are improved.

The dust-free lithium hydroxide mixing equipment comprises a mixing box and an outer cover, the outer cover is arranged on one side of the mixing box, a stirring motor is arranged in the middle of the other side of the outer cover, and the output end of the stirring motor extends into the outer cover and is provided with a first belt pulley; the output end of the stirring motor extends into the mixing box and is fixedly connected with a stirring shaft, stirring rods are uniformly arranged on the stirring shaft, mixing rods are uniformly arranged on the stirring rods, screw rods are arranged at the positions, parallel to the stirring shaft, of the upper part and the lower part in the mixing box, and transmission blocks are arranged on the screw rods; and an annular scraper is arranged on the transmission block. Materials in the mixing box are stirred transversely and longitudinally, so that the materials can be mixed more uniformly, meanwhile, the materials attached to the inner wall can be scraped off, waste is reduced, and the materials can be filtered and scattered during feeding, so that the materials are convenient to mix.

The present disclosure provides a method of recovering a spent battery cathode material comprising lithium and at least one of nickel, cobalt and / or manganese, the method comprising: heating the spent battery cathode material in a reducing atmosphere to form a heat-treated spent battery cathode material comprising LiF and one or more of LijO, LiOH and LijCOs; washing the heat treated waste battery cathode material in an aqueous solvent to extract lithium-containing species and fluorine-containing species wherein the aqueous solvent is free of alkaline earth metal hydroxides or other species intended to reduce or prevent soluble fluorine species from remaining dissolved in the aqueous solvent; separating an aqueous solvent comprising lithium and fluorine species from the heat treated waste battery material; after separating an aqueous solvent comprising lithium and fluorine species from the heat-treated waste battery material, treating the aqueous solvent to separate lithium species from fluorine species; recycling a lithium substance in the form of lithium hydroxide or lithium carbonate; forming an acidic aqueous recovery feed comprising one or more of nickel, cobalt and / or manganese by leaching the heat treated waste battery cathode material with a mineral acid after the step of separating the aqueous solvent from the heat treated waste battery material; and recovering one or more of nickel, cobalt and / or manganese from the acidic aqueous recovery feed by a further process step selected from one or more of solvent extraction, solid phase extraction, electrochemical extraction and precipitation processes.

The invention discloses a lithium hydroxide granulation process of a carbon dioxide absorbent, and relates to the technical field of lithium hydroxide granulation, uniform particle size distribution is beneficial to dispersion and reaction uniformity in the subsequent processing process, the problem of inconsistent product performance caused by particle size difference is avoided, and the test of a universal material testing machine shows that the lithium hydroxide granulation process can be used for preparing lithium hydroxide granules. The average compressive strength of the prepared lithium hydroxide particles is 5N / particle, and the lithium hydroxide particles have better mechanical strength, are not easy to break in the storage, transportation and industrial processing processes, can effectively reduce the generation of dust, reduce the risk of environmental pollution, ensure the quality stability of the product and meet the basic requirements on the particle strength in actual production. After the product is placed in an environment with the humidity of 70% for 24 hours, the weight gain rate of the particles is increased by 50-70%, and compared with ungranulated powdery lithium hydroxide, the hygroscopicity is remarkably improved, which is benefited from the micropore loose structure of the particles and the protective effect of the binder, the storage stability of the product in a humid environment is effectively improved, and the absorption function of the product on carbon dioxide in air is increased.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly discloses a diameter-controllable one-dimensional lithium manganate nanorod as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing manganese sulfate, potassium permanganate, a structure-directing agent and a surfactant into a solvent, and carrying out hydrothermal reaction to obtain a black precipitate; sintering the black precipitate to obtain a manganese dioxide nanorod; and mixing the manganese dioxide nanorod with lithium hydroxide, and carrying out two-stage sintering to obtain the one-dimensional lithium manganate nanorod. The prepared lithium ion battery anode material is uniform in thickness and very small in surface energy, can effectively shorten the transmission path of lithium ions when being used as an anode material, is not easy to agglomerate, has good flexibility, can maintain the structural integrity in a large-current long-time service process, and is beneficial to improving the rate and cycle performance of an electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of manganese dioxide can be accurately adjusted, and controllable preparation of one-dimensional lithium manganate is realized.

The invention discloses a synthesis method of lithium difluoro (oxalato) borate. The synthesis method comprises the following operation steps: S1, introducing negative ions SF < 6-> into a triethyl boron (CH2CH3) 3B solution, and carrying out a primary reaction; s2, oxalic acid is added for an intermediate reaction; s3, lithium hydroxide is added for a final reaction, and a final reaction product lithium difluoro (oxalato) borate LiC2O4BF2 is generated; the preparation process is efficient, simple and environment-friendly, and is suitable for serving as a synthesis process route for realizing industrial large-scale production of lithium difluoro (oxalato) borate, and the large-scale industrialization level of the electrolyte additive is further improved.