3373 results about "Cobalt salt" patented technology

The invention relates to a method for recovering and preparing lithium cobalt oxide by using a disused lithium battery, belonging to the technical field of recovery and recycle of electrode materials.The method comprises the steps of: discharging, disassembling, smashing, NMP processing and burning a disused lithium battery sequentially, to obtain a disused LiCoO2 material; ball-milling the disused LiCoO2 material and adding natural organic acid and hydrogen peroxide to obtain a solution of Li<+> and Co<2+>; adding lithium salt or cobalt salt after filtering, and then heating by water bath; dropwise adding ammonia water in the solution to prepare a xerogel; and performing secondary burning to obtain an electrode material of lithium cobalt oxide. The method has the advantages that the electrochemical properties of the electrode material of the disused lithium battery can be recycled with obvious effect as well as simple and easy operation; the natural organic acid used in the process of acid dipping has small damage to apparatus; and the method is environment friendly and efficient, and has low cost, simple technique, high recovery rate and industrialized promotion.

The present invention relates to energy source material technology, and is preparation process of high density spherical lithium nickel-cobalt-manganate as positive electrode material for lithium ion cell. The preparation process includes the reaction of nickel salt, cobalt salt, manganese salt, ammonium hydroxide and ammonian in water solution to synthesize spherical or spheroid precursor Ni1 / 3Co1 / 3Mn1 / 3 (OTHER)2, washing, drying and mixing with lithium carbonate; and high temperature treatment in the air at 750-950 deg.c for 8-48 hr to obtain spherical lithium nickel-cobalt-manganate. The spherical lithium nickel-cobalt-manganate has great bulk density reaching 2.25-2.50 g / cu cm after vibration densifying, average grain size of 3-7 microns, and reversible specific capacity up to 172-185 mA.hr / g.

There is provided a pneumatic tire capable of achieving both reduced rolling resistance and enhanced durability and a method of producing the same. The pneumatic tire includes a reinforcement layer, formed of a steel cord coated with coating rubber, including at least one of a carcass, a bead reinforcement layer, a side reinforcement layer and a belt, with said coating rubber formed of a rubber compound containing 100 parts by mass of diene rubber, 30 to 80 parts by mass of silica having a nitrogen surface area of at least 70 m2 / g and at most 150 m2 / g, 1 to 15 parts by mass of a silane coupling agent, and organic acid cobalt salt. Preferably the steel cord has a cut edge of a breaker coated with an edge strip of rubber.

The invention discloses a graphene-supported cobaltosic oxide nano composite material and a preparation method thereof. The graphene-supported cobaltosic oxide nano composite material consists of graphene and cobaltosic oxide, wherein the cobaltosic oxide is loaded on graphene nano sheets; the content of the graphene nano sheets is 2 to 95 weight percent, and the thickness of the graphene nano sheets is 0.3 to 50 nanometers; and the particle size of the cobaltosic oxide is 1 to 200 nanometers and the cobaltosic oxide is ball-shaped or flaky. The preparation method comprises: firstly, mixing solution of graphene oxide, a bivalent cobalt salt and a polymer surfactant; and secondly, mixing the solution obtained by the first step with alkaline solution added with an oxidant, stirring the mixed solution or stirring the mixed solution by ultrasonic waves for 0.2 to 5 hours, transferring the mixed solution to a high-temperature reaction kettle, annealing the reaction product at 100 to 250 DEG C for 3 to 30 hours to obtain a product and washing and drying the product to obtain the graphene-supported cobaltosic oxide nano composite material. The size of the cobaltosic oxide is controllable. The reduction of the graphene oxide and the generation of the cobaltosic oxide are accomplished at the same time.

The invention discloses a carbon-coated ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a ternary positive electrode material precursor by taking nickel salt, cobalt salt and manganese salt as raw materials; S2, preparing a conductive carbon dispersion system, wherein conductive carbon is dispersed in water containing an organic carbon source; S3, adding the ternary positive electrode material precursor and a lithium compound into the conductive carbon dispersion system, and mixing uniformly to obtain a mixture; S4, drying the mixture under a vacuum condition; S5, carrying out high temperature treatment on the dried mixture under a closed condition or in an inert gas protection atmosphere so as to obtain the carbon-coated ternary positive electrode material. The carbon-coated ternary positive electrode material is uniform in coating, simple to operate, low in cost and high in efficiency; the conductive carbon and the ternary positive electrode material are simultaneously coated with network-shaped amorphous carbon which serves as a conductive medium or a channel of the conductive carbon and the ternary positive electrode material, thereby greatly improving the rate performance of the ternary positive electrode material.

The invention belongs to the field of preparation techniques of nanophase materials and green energy resources, and relates to a preparation method of a nano positive material LiNi1 / 3Mn1 / 3Co1 / 3O2 applied to a lithium ion battery. By using the method, the defects that the calcining temperature needed by a current synthetic material is high, the calcining time is long, the particle sizes of a product are not uniform, and the like, are mainly solved. The preparation method comprises the following steps: adding a certain amount of template agent in a mixed aqueous solution of a nickel salt, a manganese salt and a cobalt salt, and then, dripping a precipitant and a complexing agent into the obtained mixture to form a precipitate; subjecting the precipitate and the mixed aqueous solution to a high-pressure thermal reaction in a hydrothermal kettle, cleaning and baking the obtained product to be dry, so as to obtain a nickel manganese cobalt oxide; and finally, uniformly mixing the nickel manganese cobalt oxide with the lithium salt to prepare a final product by calcining and cooling. By using the preparation method, the product with favorable electrochemical performance can be obtained within a shorter calcining time; the energy consumption is decreased; and the preparation method has obvious economic benefit in the large-scale application of industrial synthesis.

The invention belongs to the field of preparation and application of energy source materials and discloses a nitrogen-doped carbon nanotube / Co composite catalyst and a preparation method and application thereof. The preparation method includes: 1), respectively preparing melamine, cobalt salt and P123 into water solutions; 2), adding the melamine solution into the P123 solution, stirring for mixing, adding the cobalt salt solution, stirring for mixing, performing ultrasonic treatment, and heating while stirring until water is evaporated to obtain a precursor material; 3), pre-calcining the precursor material at 200-400 DEG C in an inert gas atmosphere, calcining at 450-600 DEG C and at 750-900 DEG C respectively, using an acid solution for soaking, cleaning, and drying to obtain the composite catalyst. The catalyst is high in oxygen reduction and oxygen evolution catalytic activity and stability and has high hydrogen evolution catalytic activity and stability in an acidic condition. The preparation method is simple, extensive in raw material source, low in cost and suitable for large-scale production. The composite catalyst is used in the field of integrated regenerative fuel cells.

The invention discloses a method for preparing an aluminum oxide coated modified lithium nickel cobalt manganese oxygen cathode material. The method comprises the following steps of: (1) preparation of a precursor: mixing water-soluble metallic nickel salt, cobalt salt and manganese salt into a mixed solution, dripping the mixed solution, a precipitator and a morphological control agent into a reaction container, controlling the pH value and reaction temperature of a system, and performing filtering, washing and vacuum drying after reaction to obtain a (NixCoyMn1-x-y)(OH)2 precursor, wherein x, y and x+y are more than 0 and less than 1; (2) preparation of an aluminum oxide coated precursor: dispersing the (NixCoyMn1-x-y)(OH)2 precursor, water-soluble aluminum salt and a disperser into deionized water, stirring while heating until the disperser is hydrolyzed, filtering to obtain an Al(OH)3-coated (NixCoyMn1-x-y)(OH)2 precursor, roasting the precursor in a sintering furnace to obtain Al2O3-coated (NixCoyMn1-x-y)(OH)2 precursor powder; and (3) uniformly mixing the Al2O3-coated (NixCoyMn1-x-y)(OH)2 precursor powder with lithium salt powder, and calcinating at high temperature to obtain an aluminum oxide coated modified Li(NixCoyMn1-x-y)O2 cathode material with a lamellar crystal structure.

The invention relates to a cobalt-intercalated molybdenum sulfide secondary battery material and a preparation method and an application thereof. A three-dimensional cobalt-intercalated molybdenum sulfide multi-level structure is prepared by adopting a chemical solution method; firstly, a cobalt salt, a molybdenum salt and a sulfur source are dispersed into a solvent to prepare a reaction liquid; and then the prepared reaction liquid is subjected to solvent thermal treatment to obtain the three-dimensional cobalt-uniformly-intercalated molybdenum sulfide multi-level structure which is self-assembled by graphene-like ultra-thin nanosheets, wherein the size of the multi-level structure is about 100nm. The invention also discloses a preparation method for the multi-level structure. The secondary battery material prepared by the method is stable in nanomaterial performance, and long in cycle life when the secondary battery material is used as a negative electrode material of a lithium ion battery and an electrode material of a supercapacitor.

The invention relates to a graphene nanometer sheet-cobaltous oxide composite negative electrode material of a lithium ion battery and a preparation method thereof, and belongs to the technical field of batteries. The negative electrode material consists of graphene nanometer sheets and cobaltous oxide, wherein the graphene nanometer sheets are distributed on cobaltous oxide particles in a staggering way; the mass fraction of the graphene nanometer sheets is 5 to 90 percent; the thickness of the graphene nanometer sheets is 1 to 50 nanometers; and the particle size of the cobaltous oxide is 10 to 500 nanometers. The preparation method comprises the following steps: dispersing graphite oxide in alcohol-water solution or aqueous solution with ultrasound or stirring; adding cobalt salt, alkali and a reducing agent into the mixture and pouring the mixture into a hydrothermal kettle after stirring; performing further sealing and synchronous hydrothermal reaction, washing, filtering and drying to obtain a graphene nanometer sheet-cobaltous oxide composite; and processing the graphene nanometer sheet-cobaltous oxide composite in the protective atmosphere to obtain the graphene nanometer sheet-cobaltous oxide composite negative electrode material. In the invention, when the material is charged or discharged by a current of 200mA / g, the reversible specific capacity of the material can be stabilized in a range of over 900mAh / g.

The invention relates to a rare-earth doping modified lithium ion battery ternary positive electrode material and a preparation method of the rare-earth doping modified lithium ion battery ternary positive electrode material. The chemical general formula of the material is as follows: LiNiaCo<1-a-b>MnbRxO2 / M, wherein a is more than 0 and less than 1, b is more than 0 and less than 1, (1-a-b) is more than 0 and less than 1, x is more than 0.005 and less than 0.1, R is one or more of rare-earth lanthanum, cerium, praseodymium and samarium, and M is a composite cladding layer of oxide of aluminum, titanium or magnesium and carbon. The soluble metal nickel salt, cobalt salt, manganese salt and rare-earth compound are mixed to prepare a mixed salt solution, the mixed salt solution is reacted with a mixed alkaline solution prepared by mixing NaOH and ammonium hydroxide, after the reaction solution is filtered, washed and dried, the obtained product is uniformly mixed with lithium salt powder to be ball milled, then the mixture is calcined at the high temperature and coated with the composite cladding layer of the aluminum, titanium or magnesium oxide and carbon, and finally the calcined mixture is calcined at a constant temperature to obtain the rare-earth doping modified lithium ion battery ternary positive electrode material. After doping the rare earth, the metal oxide and carbon composite cladding layer, which are cheap and easy to obtain, are adopted, so that the cycling performance and the rate performance can be improved, and the charging-discharging efficiency of the material also can be improved.

Disclosed herein are antimicrobial compositions comprising an effective concentration of a metal salt combined with a plant extract. In some embodiments the composition comprises a copper salt and / or an iron salt and / or a nickel salt and / or a cobalt salt; and an extract of a plant selected from a group consisting of Punka granatum, Viburnum plicatum, Camellia sinensis, and Acer spp. The invention extends to uses of such compositions as medicaments, and to methods of treating microbial infections. The invention extends to methods for preventing microbial infections by coating objects and surfaces with the compositions.

The invention discloses a method for synthesis of a cobalt nanoparticle and bamboo-like nitrogen doped carbon nanotube composite material. The method includes: dissolving a soluble cobalt salt and an amine polymer in a hydrophilic reagent according to a mole ratio of 1:(2-200), performing evaporation at 60DEG C, conducting grinding after cooling, performing calcination at 400-1400DEG C under nitrogen atmosphere, then treating the sample with acid, and carrying out washing, centrifugation and drying so as to obtain the cobalt nanoparticle and bamboo-like nitrogen doped carbon nanotube composite material. The obtained cobalt nanoparticles have small particle size and are employed to coat the head of a carbon nanotube evenly so as to combine tightly with the carbon nanotube. The composite material has application prospects in fuel cell anode materials, lithium ion battery cathode materials and the like. The method designed by the invention has the advantages of easily available raw materials, simple process and no pollution, short preparation period, mild reaction conditions, low cost, and mass synthesis capability, etc.

The invention relates to a modified lithium ion battery ternary positive electrode material and a preparation method of the modified lithium ion battery ternary positive electrode material. The chemical generation formula of the material is as follows: LiNiaCo<1-a-b>MnbBxO2 / TiO2, wherein a is more than 0 and less than 1, b is more than 0 and less than 1, (1-a-b) is more than 0 and less than 1, x is more than 0.005 and less than 0.1, and the TiO2 is a cladding layer. The soluble nickel salt, cobalt salt and manganese salt are prepared into a mixed salt solution, the mixed salt solution is reacted with a mixed alkaline solution prepared by mixing the NaOH and ammonium hydroxide, after being filtered, washed and dried, the reaction product is mixed with a boronic compound and roasted for 4h to 12h at the temperature of 300 to 800 DEG C under an air atmosphere, then the roasted product is ball milled with the lithium salt to be uniformly mixed together, the mixture is coated with titanium dioxide after being calcined at the high temperature to obtain the modified lithium ion battery ternary positive electrode material. The prepared boron doping modified ternary positive electrode material is high in specific capacity and good in cycling performance.

The invention relates to a nickel cobaltate-graphene composite material and a preparation method thereof. The composite material comprises graphene and nickel cobaltate, wherein nickel cobaltate nanowires are uniformly grown on a graphene sheet, the wire length of the nickel cobaltate nanowires is 50-300nm, and the wire width is 5-30nm. The preparation method comprises the following steps of: taking a graphene oxide water solution and a cobalt salt and nickel salt water solution which are dispersed in an ultrasonic manner, mixing, further adding a precipitator, uniformly stirring and mixing, transferring into a high-temperature reaction kettle, performing hydro-thermal reaction for a certain period of time, filtering, washing and drying an obtained product, and further performing thermal treatment so as to obtain the nickel cobaltate nanowire-graphene composite material. The nickel cobaltate nanowire-graphene composite material prepared by the method disclosed by the invention has the advantages of high single-electrode capacitance and good cycle performance, and is suitable for being used as an electrode material of a super-capacitor.

This invention relates to one multi-element metal oxidation and discloses The process method, which comprises the following steps: a, in nitrogen or inertance gas depositing the mixture of cobalt salt, nickel salt and maganism salt to generate Ni-Co-Mn compound hydrogen oxidation to process front drive after drying and grinding; b, adding lithium hydrate into the front drive grinding and processing mixture to remove absorbed water and structure water; c, processing products under degrees of 650 to 850 degrees; d, using high polymer as assistant agent to process surface covering on product; e, processing the product to remove solvent to process multi-metal oxidation.

This invention relates to a method for preparing olivine-type phosphate-series lithium ion battery anode material. The method comprises: mixing one or more of ferrous salt solution, cobalt salt solution and manganese salt solution with oxalic acid or oxalate (precipitating agent) aqueous solution to obtain composite oxalate precursor, uniformly mixing with lithium source and phosphorus source by ball milling, and reacting in inert or weak-reductive atmosphere to obtain olivine-type phosphate-series lithium ion battery anode material. The method utilizes co-precipitation method for metal ion doping, and realizes molecular level uniform mixing among different ions. The obtained olivine-type phosphate-series lithium ion battery anode material has uniform chemical and physical compositions. The average particle size can be controlled within 0.3-10 mu.m. The first charge and discharge cycle specific capacity can reach 150 mAh / g at 0.1 C rate and room temperature. The livine-type phosphate-series lithium ion battery anode material has such advantages as high cycle performance and high charge / discharge performance.

The invention relates to a preparation method of a single-crystal Li(NiCoMn)O2 ternary cathode material, and belongs to the technical field of a manufacturing process for chemical electrode materials. The preparation method comprises the following steps: firstly, nickel salt, cobalt salt and manganese salt are dissolved in a deionized water and ethylene glycol mixed solution, the mixture is uniformly stirred, a surfactant is added, the mixed solution is clarified, a precipitant is added, the mixture is uniformly stirred and poured into a reactor, the reactor is arranged in a drying oven for a reaction, and then an obtained precursor and lithium salt are mixed, presintered and calcined to obtain a target product. The preparation method is simple and convenient to operate, the controllability of preparation parameters is high, the prepared ternary cathode material is a single-crystal material, particle sizes are concentrated at the submicron dimension, a fast conveying channel with the short path is provided for lithium ions, and contact of the material with an electrolyte is increased. The ternary cathode material has high specific capacity, high rate capability and high cycling stability, and meets the requirements of electronic products with high volume energy density.

The invention discloses a high-density spherical nickel-cobalt-aluminum precursor material. The chemical molecular formula of the nickel-cobalt-aluminum precursor material is Ni(1-x-y)CoxAly(OH)(2+y); the tap density of the nickel-cobalt-aluminum precursor material is 1.8-2.4 g / cm3; the material is spherically granular; the average particle size of the material ranges from 6 to 17 microns. The invention also discloses a preparation method of the precursor material. The preparation method comprises the following steps of: firstly, evenly mixing an aluminum salt with a complexing agent; secondly, evenly mixing a nickel salt with a cobalt salt solution; adding the mixed solution, the complexing agent and a precipitator solution to a reactor in parallel for continuous coprecipitation reaction, controlling the pH value in the reaction process within the range from 11 to 12, keeping the materials stay in the reactor not more than 20 h, performing solid-liquid separation after stable reaction, and finally, aging, washing and drying the solid material to obtain the high-density spherical nickel-cobalt-aluminum precursor material. The aluminum element in the high-density spherical nickel-cobalt-aluminum precursor material provided by the invention can be combined with nickel and cobalt elements evenly; and the tap density of the high-density spherical nickel-cobalt-aluminum precursor material is higher.

The invention discloses a preparation method of a carbon nano-tube loaded nano-cobalt catalyst. The method comprises the following steps: (1) dissolving a cobalt salt in an organic solvent and then adding a ligand to obtain a mixed liquid; (2) transferring the mixed liquid to a high-pressure kettle, performing a thermostatic heating reaction, naturally cooling to room temperature and then orderly performing filtration, washing and vacuum drying treatment on the generated crystal or powder to obtain a metal organic skeleton product Co-MOF of cobalt; and (3) roasting the metal organic skeleton product Co-MOF for 100-180 minutes at a roasting temperature of 400 DEG C to 1000 DEG C in a calcination atmosphere of argon inside a tubular furnace so as to obtain the carbon nano-tube loaded nano-cobalt catalyst. The preparation method disclosed by the invention has the advantages that the raw materials are low in cost, the production process is also simple, the reaction condition is easy to control, no template agent and surfactant are needed, the prepared product is good in consistency and environment-friendly; and the preparation method is beneficial to batch production and application of carbon nano-tube loaded nano-cobalt.

The invention provides a Co3O4 nano hollow sphere material and a preparation method and the application thereof. The preparation method of the Co3O4 nano hollow sphere material comprises the following steps of: mixing cobalt salt, surface active agent, precipitant with water according to stoichiometric ratio; putting mixed solution into a reaction kettle to perform hydro-thermal reaction, washing and drying to obtain a powdered mixed precursor; and heat treating the precursor in air to finally obtain the Co3O4 nano hollow sphere material. The obtained Co3O4 nano hollow sphere material has a regular surface nano piece layer and an internal hollow network structure, has a better electrochemical behavior, can be used for a cathode of a rechargeable lithium ion battery, can guarantee the electrolyte to be sufficiently permeated, can provide more electric active points with an increased contact surface, guarantees the lithium ion to better perform an embedding / withdrawing electrochemical behavior, enlargers the specific surface area, and improves the lithium storage capability. The internal network structure also shortens the reaction path of the lithium ion, i.e. shortens the conduction path of the e-and the Li+, thereby improving the characteristic of multiplying power.

The invention discloses a method for preparing a nickel cobalt lithium aluminate cathode material. The method comprises the following steps of: uniformly mixing a nickel salt solution, a cobalt salt solution and an aluminum salt solution in a certain mole ratio of metal ions; adding a complexing agent solution, a precipitator solution and a metal salt solution together into a high-speed stirring reaction kettle with a base solution, and performing precipitation reaction; after complete reaction, performing oxidizing reaction on discharged slurry and an oxidizing agent with certain concentration in an alkaline environment; after the oxidizing reaction is finished, performing solid liquid separation on the slurry, washing in pure water, and drying to obtain a nickel cobalt aluminum hydroxyl oxide precursor of a lithium ion battery cathode material; fully mixing the precursor with a lithium source, and performing multi-step sintering in an oxygen atmosphere; and performing crushing and subsequent treatment on a material obtained by sintering, and thus obtaining the nickel cobalt lithium aluminate cathode material. The method is low in equipment requirement, simple in flow, low in energy consumption and low in waste. The produced material is high in tap density and high in capacity.

The invention relates to a method for preparing aluminum-coated anode materials of lithium-ion batteries, which is characterized in that: firstly, soluble nickel salts, cobalt salts, and manganese salts are formulated into salt solutions, and then mixed with ammonia-water-mixed sodium hydroxide or potassium hydroxide solutions React to form precursor particles, wash and dry; add water to the dried precursor particles to prepare a flowable slurry, stir, and add trivalent aluminum salt solution and sodium hydroxide or potassium hydroxide solution dropwise to the slurry at the same time , to obtain the precursor of nickel hydroxide cobalt manganese coated with aluminum; then mix the precursor with lithium source, and then sinter to obtain the positive electrode material of lithium ion battery coated with aluminum. The present invention has the following obvious advantages: raw materials are easy to obtain; coated The process conditions are easy to control, and it is easy to obtain a relatively uniform coating body; the prepared positive electrode material can make the lithium ion battery have superior high temperature stability and better cycle characteristics.

The invention relates to a preparation method for a double-metal-sulfide catalyst. Soluble molybdate and nickel salt or cobalt salt serves as a raw material, thiourea or thioacetamide serves as a sulfur source, and a Ni(Co)-S / MoS2 catalyst is prepared through a two-step hydrothermal method. The method particularly comprises the following steps: MoS2 is prepared in a high pressure reactor through the hydrothermal method first, then the nickel salt or cobalt salt and the sulfur source are added into the reactor of the obtained MoS2 to be evenly mixed, the reactor is sealed and heated, a reaction is conducted for a certain period of time, and Ni-S or Co-S is deposited on the MoS2, so that the Ni(Co)-S / MoS2 catalyst is prepared. The preparation method is characterized in that the specific area of the Ni(Co)-S / MoS2 catalyst prepared through the two-step hydrothermal method is large, high temperature vulcanization is not required in the preparation process, the preparation condition is mild, the catalyst is used for hydrodeoxygenation, a target product has high yield and good repeatability, and hydrodeoxygenation activity of the catalyst is high.

The invention discloses three-dimensional porous urchin-like cobalt phosphide as well as a preparation method and an application thereof. The preparation method comprises the steps of: uniformly mixing a cobalt salt and an amino compound in a neutral-polarity solvent to have hydrothermal reaction to prepare a three-dimensional urchin-like hydrated basic cobalt carbonate precursor mainly formed by assembly of nanowires; and annealing the hydrated basic cobalt carbonate precursor and hypophosphite at a high temperature to obtain the three-dimensional urchin-like cobalt phosphide. By preparing the three-dimensional urchin-like hydrated basic cobalt carbonate precursor by a simple hydrothermal process and obtaining the three-dimensional urchin-like cobalt phosphide through high temperature phosphorization, not only is the process simple and controllable, the source of raw material wide and the cost low, but also the yield is relatively high, and the mass production is realized. The prepared product is uniform in size, has an urchin-like porous structure, maintains more catalytic active sites, has high activity and excellent stability and is wide in application prospect in the field of electric catalysis.

The invention provides a carbon fiber supported cobalt sulfide nanosheet catalyst and application thereof and belongs to the technical field of synthesis and application of catalysts. Firstly, metallic cobalt salt and a sulfur source are dissolved in ethylene glycol, then the solution is fed into a reaction kettle with a polytetrafluoroethylene liner, and a carbon-based conductive material is added and then is processed at a certain temperature to obtain the carbon fiber supported cobalt sulfide nanosheet catalyst. The carbon fiber supported cobalt sulfide nanosheet catalyst is prepared by adopting a solvothermal method through one step, and the synthesis method is moderate and simple, has no high device requirement and is suitable for scale production. In addition, synthesis raw materials are cheap, the controllability is high, and the reproducibility of sample properties is good. What's emphasized is that more catalytic active sites can be exposed and electric catalytic cracking hydrogen production performance of the cobalt sulfide can be greatly improved through combination of cobalt sulfide nanosheets generated in situ and the flexible three-dimensional structure of carbon fiber.

The invention discloses a method for recovering valuable metal from a waste lithium ion battery material, and belongs to the technical field of comprehensive recycling and resource recycling of electronic wastes. The method comprises steps of mixing the cathode material of the waste lithium ion battery with low-valence sulfate such as sulfur or sulfide; subjecting the mixture to a sulfuration calcination treatment at a temperature of 300 to 900 degrees centigrade; immersing a calcined product in water to obtain a lithium salt aqueous solution which can be further used for preparing a lithium carbonate product; subjecting to water leaching residues to oxidation acid leaching or direct acid leaching to extract valuable elements such as nickel, cobalt and manganese; and purifying and extracting the leaching solution to obtain the corresponding cobalt salt and nickel salt products. The method of the invention has a simple process and a short process flow. The sulfur dioxide gas generated by calcining the sulfide can be used for preparing sulfuric acid used for subsequent nickel-cobalt leaching, thereby achieving zero pollution discharge and finally achieving a purpose of comprehensively recovering the valuable metal in the lithium ion battery cathode material at high efficiency and low cost.

The invention discloses a method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite. The method comprises the following steps: (1) leaching out the cobalt and lithium in the waste lithium cobaltite by using acid and a reducing agent, so as to obtain lixivium; (2) removing copper, iron, aluminum, calcium and magnesium in the lixivium by using a chemical method; (3) precipitating the cobalt and lithium in a solution without impurities with carbonate; (4) drying the cobalt lithium carbonate, and blending corresponding cobalt salt and / or lithium salt according to cobalt-lithium ratio; and (5) calcining so as to obtain lithium cobaltite product. The lithium cobaltite obtained by the method is good in property, cobalt and lithium recoveries are above 99% and above 96% respectively. The method has the advantages of simple process, low cost and high economic benefits, and is easy to carry out industrial production.