2264results about "Cobalt compounds" patented technology

Disclosed are a positive electrode material, a preparation method of a positive electrode material, a positive electrode plate, and a battery. The positive electrode material includes a sodium-containing oxide, an angle range of a first characteristic peak of the sodium-containing oxide is less than an angle range of a second characteristic peak, the first characteristic peak is a characteristic peak of the sodium-containing oxide at an initial voltage, the second characteristic peak is a characteristic peak of the sodium-containing oxide at a cut-off voltage, and a chemical formula of the sodium-containing oxide is LixNa1-xCo1-z MzO2. M includes a metal element or a non-metal element, 0.7<x<1, and 0.001<z<0.03.

The invention provides a nano enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: adding a stabilizer into a preheated solvent, and carrying out ultrasonic treatment; then adding ferric salt and cobalt salt, and adding alkali to adjust the pH value of the solution; then transferring the solution into a reaction kettle for reaction; and after the reaction, washing and separating to obtain the product. The obtained nano-enzyme is appropriate and uniform in particle size and good in dispersity, the enzyme activity is as high as 9.56 U / mg, and the application of the nano-enzyme in immunochromatography detection and plant canker prevention and treatment is widened. When the immunochromatography detection card prepared from the nano enzyme is used for detecting human hemoglobin, the detection limit can reach 0.05 ng / mL and is at least 10 times lower than that of a commercially available kit. When the nano-enzyme suspension is used for preventing and treating the kiwifruit canker, the nano-enzyme suspension with the concentration larger than or equal to 0.1 mg / mL is used, and the plant canker can be well controlled.

The embodiment of the invention relates to a lithium cobalt oxide positive electrode material with a composite phase as well as a preparation method and application of the lithium cobalt oxide positive electrode material. The chemical general formula of the lithium cobalt oxide positive electrode material with the composite phase is AXCo (1-y) M (1y) O2, wherein x is more than or equal to 0.5 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 0.03, A is Li or Li and Na, and M1 is one or more of A1, Zr, Ni, Mn, Y, Nb, La, Fe, Cu, Cr, Ti, W, Mg, Mo or Yb; the composite phase of the lithium cobalt oxide positive electrode material comprises an O2 phase, a T2 phase and an O3 phase; wherein the sum of the molar ratios of the O2 phase and the T2 phase in the composite phase is greater than or equal to 90%, and the molar ratio of the O3 phase is less than or equal to 10%. By regulating and controlling the composite phase proportion of the lithium cobalt oxide positive electrode material, the rate capability, the structural stability under high voltage, the stability of a thermodynamic structure, the specific capacity, a discharge platform and other characteristics of the positive electrode material can be effectively improved, so that the lithium cobalt oxide positive electrode material with high energy density and high stability is realized.

The invention relates to the technical field of lithium ion batteries, and provides a lithium cobalt oxide composite material which comprises a core body and a coating layer coating the core body, the core body comprises O2-phase lithium cobalt oxide, and the O2-phase lithium cobalt oxide is doped with an element M; the coating layer comprises an oxide containing an N element; the M element comprises at least one of Al, Mg, W, Ti, La, Zr, Ni, Mn and Y; n comprises at least one of Al, Mg, Y, W, Nb, La, Zr, Ti and P. The lithium cobalt oxide composite material provided by the invention is used as a positive electrode material of a lithium ion battery, and the cycling stability of the lithium ion battery under high potential is improved.

The invention provides a method for precipitating nickel and cobalt in a solution containing nickel and cobalt and a cobalt nickel hydroxide product. The method comprises the following steps: step S100, carrying out a seed crystal pretreatment reaction on a nickel-cobalt-containing solution by adopting first nickel-cobalt precipitation underflow to form pretreated nickel-cobalt ore pulp; step S200, adding an alkaline precipitation inducer into the second nickel-cobalt precipitation underflow or the first nickel-cobalt precipitation overflow to carry out alkali conversion reaction to form alkali conversion crystal mush; s300, the pretreated nickel-cobalt ore pulp and alkali conversion crystal mush are continuously introduced into a reactor for a nickel-cobalt precipitation reaction, and nickel-cobalt precipitated ore pulp is obtained; step S400, continuously performing dense separation treatment on the ore pulp subjected to nickel-cobalt precipitation; s500, the third nickel-cobalt precipitation underflow is filtered and washed in sequence, a nickel-cobalt hydroxide product is obtained, and the problems that in the prior art, when nickel and cobalt are precipitated through a nickel-cobalt-containing solution, MHP is small in particle size and not prone to sedimentation, the water content of a filter cake is high, or the precipitation rate is poor, and the magnesium content is high before technical improvement are solved.

The invention provides a lithium-rich manganese-based positive electrode active material and a preparation method and application thereof. The lithium-rich manganese-based positive electrode active material comprises a lithium-rich manganese-based core, a first coating layer and a second coating layer, the chemical formula of the lithium-rich manganese-based core is Li < 1 + x > Ni Mn M < c > O < 2 + x >; 0.25 < = x < = 0.4, a + b + c = 1, 0.33 < = a < = 0.35, 0.63 < = b < = 0.65, and 0 < = c < = 0.02; m is selected from at least one of W, Ta, Nb, Ti, Sb, Al, Mg, Zr, Sr and Mo; the first coating layer is X-doped nano layered lithium cobalt oxide, and X is selected from at least two of Al, La, Nb, Sr, Ti, Mn, Mo, Ta, W, K, B and F; and the second coating layer comprises a fast ion conductor and / or a spinel-like phase cobalt lithium compound. The positive electrode active material provided by the invention has excellent storage capacity.

The invention belongs to the technical field of batteries, and particularly discloses a positive electrode material and a preparation method thereof, a lithium ion battery and a power utilization device, and the positive electrode material meets the following conditions: 1.5 < Kn90 = (Ln90-Ln10) / Ln50 < 4.5; ln10 is more than 0 and less than 2000; ln50 is more than Ln10 and less than 3000; and Ln90 is more than Ln50 and less than 15000. The positive electrode material has relatively high capacity, relatively good cycle retention rate and excellent low-temperature performance, the preparation method is simple to operate and relatively low in cost, and the comprehensive performance of the battery is favorably improved when the positive electrode material is applied to the battery.

The present invention relates to a process for producing a transition metal carbonate in a continuously operated reactor. In further aspects, the present invention relates to a lithium- and / or sodium-containing transition metal mixed oxide obtainable by this process, as well as the use of an organic additive for producing a transition metal carbonate as a precursor to a lithium- and / or sodium-containing transition metal mixed oxide.

The invention discloses a graphene magnetic wave-absorbing material and a preparation method and application thereof.A one-step hydrothermal method is creatively adopted for compounding a magnetic loss type material (CoFe2O4) and a resistance loss type material (RGO) to prepare a novel efficient wave-absorbing performance material, specifically, an iron source and a cobalt source are dispersed into an RGO solution, then sodium acetate and polyethylene glycol are dissolved in the RGO solution, cooling is conducted after heating reaction, and the graphene magnetic wave-absorbing material is obtained. And separating, washing and drying to obtain the product. According to the graphene magnetic wave-absorbing material, the optimal impedance matching and the excellent attenuation characteristic are achieved through the synergistic effect of the two components, and the excellent electromagnetic wave absorbing performance is shown under various thicknesses or even ultra-thin thicknesses. In addition, the material source is wide, the cost is low, the preparation process is green, simple and feasible, the method is suitable for large-scale production, and a theoretical method and a preparation route are provided for application in the aspect of electromagnetic wave absorption in the national defense and civil fields.

Active materials (e.g., alkali-metal metal phosphate (e.g., lithium iron phosphate), alkali-metal metal oxide and / or alkali-metal metal cyanide materials), preparation processes, and apparatuses useful in the manufacture thereof are described. Well-ordered active material particles (e.g., lithium iron phosphate particles) prepared by the processes and manufacturing apparatuses disclosed herein are also described.

The invention discloses a method for recycling a lithium cobalt oxide positive electrode material in a waste lithium battery through a cascade pyrolysis method, and relates to the technical field of battery positive electrode recycling. The waste lithium battery is subjected to real-time adjustment according to a first-stage temperature adjustment formula within a first-stage pyrolysis temperature range to obtain a first-stage product; calculating a second-stage formula temperature of the first-stage product in a second-stage pyrolysis temperature range according to a second-stage temperature formula, constructing a second-stage temperature control model, and predicting a second-stage real-time prediction temperature; a second-stage product is obtained according to the second-stage formula temperature and the second-stage real-time predicted temperature, a third-stage formula temperature of the second-stage product is calculated according to a third-stage temperature formula in a third-stage pyrolysis temperature range, a third-stage temperature control model is constructed, a third-stage real-time predicted temperature is predicted, and a lithium cobalt oxide product is obtained according to the third-stage formula temperature and the third-stage real-time predicted temperature. The purity and the electrochemical performance of the lithium cobalt oxide positive electrode material are improved, and meanwhile, the energy consumption is reduced.

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention relates to a secondary battery, a positive active material, a preparation method of the positive active material, a positive pole piece and an electric device. The secondary battery comprises a positive pole piece, the positive pole piece comprises a positive active layer, and the positive active layer comprises a positive active material; in a particle size distribution curve of primary particles in the positive electrode active material, the half-peak width is marked as WH, and WH is less than or equal to 2.5 microns; the average particle diameter D1 of the primary particles in the positive electrode active material satisfies 1.3 [mu] m < = D1 < = 3 [mu] m. The battery life of the secondary battery at a high voltage is significantly improved.

The invention relates to the technical field of battery materials, and discloses an O2-phase lithium cobalt oxide positive electrode material, a preparation method thereof, a positive electrode and a battery. The chemical formula of the O2-phase lithium cobalt oxide positive electrode material is LiaNabCocMdAeO2-fXf, M and / or A are selected from any one or more of Mg, Al, W, Ti, La, Zr, Y, Ni, Mn, K and Te, a is larger than or equal to 0.9 and smaller than or equal to 1, b is larger than or equal to 0 and smaller than or equal to 0.01, c is larger than or equal to 0.95 and smaller than or equal to 1, d is larger than or equal to 0 and smaller than or equal to 0.05, e is larger than or equal to 0 and smaller than or equal to 0.01, and f is larger than or equal to 0 and smaller than or equal to 0.01. Under the synergistic effect of the doped and coated elements (M and A elements), the positive electrode material not only can reduce the existence of polycrystals and twin crystals, improve the interlayer spacing, reduce the content of residual Na and stabilize the bulk phase structure, but also can improve the stability of an interface and inhibit the generation of side reactions of the interface.

The invention relates to a rotary micro-liquid membrane reactor in-situ detection system for monitoring the nucleation behavior of a nano material. The reactor comprises a rotor and a stator, the base angle of the stator is 70-85 degrees, the rotating speed of the stator is 500-5000 rpm, the width of a slit is 10-500 microns, it is guaranteed that fluid does not backmix when passing through the slit, and a strong shear field is formed. A micro-negative pressure sampler is manufactured to capture nucleation particles in a high-speed shear field to enter a visual observation area, and a high-speed camera and a microscope objective lens are connected in situ, so that an instantaneous image of a nucleation process is obtained in a nano-micro scale, and a transient evolution behavior of a crystal nucleus is captured in situ. The construction of the rotary micro-liquid membrane reactor in-situ detection system solves the problems that the large-scale preparation quality is poor due to the fact that a traditional stirred tank reactor is poor in structure and micro-mixing effect and uncontrollable in material nucleation and growth, and the instantaneous phase transformation and nucleation process cannot be observed due to the fact that the reactor is closed. The obtained hydrotalcite nucleation result enriches the non-classical nucleation theory, and provides guidance for large-scale preparation of nano materials.

The present invention relates to: an electrochemical biosensor capable of effectively and sensitively detecting alfuzosin; an electrode applied thereto; a metal-organic framework (MOF) which includes a zinc / cobalt oxide and is applied in manufacturing the electrode; and methods for manufacturing same.

Compounds, particles, and cathode active materials that can be used in lithium ion batteries are described herein. Methods of making such compounds, powders, and cathode active materials are described. The particles have a particle size distribution with a D50 ranging from 10 μm to 20 μm.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a lithium ion battery positive electrode material, a preparation method thereof and a lithium ion battery. The lithium ion battery positive electrode material comprises a lithium-rich manganese-based positive electrode material and F-doped ferric cobaltate coating at least part of the surface of the lithium-rich manganese-based positive electrode material, the chemical formula of the F-doped ferric cobaltate is FeCo2O4-0. 5xFx, and x is larger than or equal to 0.01 and smaller than or equal to 0.06. According to the lithium ion battery positive electrode material, the lithium-rich manganese-based positive electrode material is coated with FeCo2O4-0. 5xFx, the structural stability of the lithium-rich manganese-based positive electrode material can be effectively improved, the FeCo2O4-0. 5xFx coating layer has a high Fermi level and excellent conductivity, and the ionic conductivity of the lithium-rich manganese-based material can be effectively improved.

The present invention relates to a positive electrode active material including a coating portion containing cobalt formed on the surface portion, and an island portion discontinuously formed on at least one selected from the group consisting of the surface portion and the coating portion, the island portion including at least one selected from the group consisting of aluminum (Al) and zirconium (Zr) in an amount of 0.08 mol % to 2.50 mol % relative to the total moles of metals contained in the lithium transition metal oxide, and a method for producing the positive electrode active material.

The invention discloses a layered cobalt aluminum oxide / copper sulfide wave-absorbing material and a preparation method thereof, and belongs to the technical field of novel wave-absorbing materials, the wave-absorbing material is prepared through a two-step hydrothermal method, lamellar cobalt aluminum hydroxide is prepared through the hydrothermal method, then the lamellar cobalt aluminum oxide subjected to heat treatment is used as a substrate, and the lamellar cobalt aluminum oxide / copper sulfide wave-absorbing material is prepared through the two-step hydrothermal method. The preparation method comprises the following steps: growing nano flaky copper sulfide on the cobalt-aluminum oxide / copper sulfide composite material by adopting a hydrothermal method to form a layered cobalt-aluminum oxide / copper sulfide heterostructure, and adjusting the wave-absorbing property of the composite material by adjusting the content of the copper sulfide in the composite material. According to the layered cobalt aluminum oxide / copper sulfide wave-absorbing material and the preparation method thereof, the layered cobalt aluminum oxide / copper sulfide wave-absorbing material has the advantages that the density is relatively low, the effective absorption frequency band is relatively wide, the electromagnetic wave absorption performance is relatively high, the preparation method is simple, the morphology of the composite material can be regulated and controlled, and the like.

The invention provides a lithium manganate precursor with a crystal face induction effect, a preparation method of the lithium manganate precursor, a positive electrode material and a lithium battery, and belongs to the technical field of energy materials, the lithium manganate precursor can play a crystal face induction role in the subsequent lithium mixing sintering process, the lithium manganate precursor is spherical-particle manganous-manganic oxide, the particle size D50 is 3-15 microns, and the particle size D50 is 3-15 microns. The primary particles are uniform in size. The core advantage of the method is that synchronous and uniform doping of the element M and the element M'is realized at the precursor stage through a coprecipitation method. The co-precipitation doping technology not only ensures the atomic-scale uniform distribution of doping elements in manganous-manganic oxide, but also effectively stabilizes the crystal structure of the lithium manganate positive electrode material by utilizing the synergistic effect of the elements in the subsequent sintering process, and realizes the selective induced growth of the crystal face. The unique crystal face induction effect has significant contribution to improvement of the electrochemical performance, including cycling stability, rate capability and safety, of the positive electrode material.

The invention belongs to the field of lithium ion battery materials, and discloses a chloride coated modified positive electrode material, which comprises a positive electrode material matrix and a chloride LiaMClb coated on the surface of the positive electrode material matrix, M is selected from at least one of Ti, Cr, Mn, Fe, Co and Cu, 1 < = a < = 4, 2 < = b < = 6. According to the preparation method, the chloride LiaMClb is deposited on the surface of the positive electrode material substrate in an atomic layer deposition mode. The invention also discloses a sulfide all-solid-state lithium ion battery which comprises the chloride coated modified positive electrode material. The LiaMClb is selected to coat the modified positive electrode material, the LiaMClb and the positive electrode material show good interface compatibility, and the good oxidation resistance of chloride ions can effectively inhibit the decomposition side reaction of the chloride ions and the positive electrode material in the lithium removal process.

The invention belongs to the field of lithium ion battery materials, and discloses a precursor of a lithium-rich manganese-based positive electrode material and a preparation method and application thereof.The precursor comprises a core and a coating layer coating at least part of the surface of the core, the core is Mn2Oy, and y is larger than or equal to 2 and smaller than or equal to 3; the coating layer is MnX2O4, and X is any one or more than two of Fe, Co and Zn. The Li2XMn3O8 coated lithium-rich manganese-based positive electrode material is generated by lithiating and sintering the precursor, and the Li2XMn3O8 has a spinel structure and is perfectly connected with a layered structure of the lithium-rich manganese-based positive electrode material, so that the positive electrode material has good structural stability and high voltage resistance, and the electrochemical stability of the lithium-rich positive electrode material can be effectively improved.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a metal organic framework packaged polyoxometallate coated ternary positive electrode material and a preparation method thereof. The preparation method of the ternary positive electrode material comprises the following steps: a) preparing metal A salt into a metal A salt solution; the preparation method comprises the following steps: preparing an ammonium molybdate compound into an ammonium molybdate compound solution, heating the ammonium molybdate compound solution to boiling, dropwise adding a metal A salt solution, and after dropwise adding, carrying out a constant-temperature reaction, filtering and recrystallizing to obtain Anderson type polyoxometallate; b) dissolving Anderson type polyoxometallate, a metal B salt and an organic ligand in water, and reacting at a certain temperature to obtain polyoxometallate packaged by a metal organic framework; and c) mixing a positive electrode material and the polyoxometallate packaged by the metal organic framework prepared in the step b) according to a ratio, and carrying out ball milling to obtain the ternary positive electrode material coated by the polyoxometallate packaged by the metal organic framework.

The present application belongs to the field of battery technology and specifically discloses a positive electrode material and a preparation method thereof, a lithium ion battery and an electric device. The positive electrode material satisfies: 1.5<Kn 90 =(Ln 90 ‑Ln 10 ) / Ln 50 <4.5;0<Ln 10 <2000Å;Ln 10 <Ln 50 <3000Å;Ln 50 <Ln 90 <15000Å. The positive electrode material has high capacity, good cycle retention rate and excellent low-temperature performance, and the preparation method is simple to operate and low in cost. Using it in the battery is beneficial to improving the comprehensive performance of the battery.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an antimony modified lithium cobalt oxide material as well as a preparation method and application thereof. The antimony modified lithium cobalt oxide material provided by the invention comprises layered lithium cobalt oxide and an antimony layer wrapping the surface of the layered lithium cobalt oxide, the antimony layer includes an antimony oxide compound. The lithium cobalt oxide is wrapped by the antimony layer, so that the interface stability of the lithium cobalt oxide is enhanced, the lithium cobalt oxide has good structural stability under high voltage, and the lithium cobalt oxide has excellent cycling stability and rate capability as a positive electrode material.

The present application provides a ternary composite material for an all-solid-state battery, including a ternary material and a fast ion conductor of LixMyFx+3y in-situ coated on the surface of the ternary material; the application also provides a preparation method for ternary composite material and its application. On the one hand, the presence of LixMyFx+3y in the ternary composite material provided by the present application improves the interfacial contact between the ternary positive electrode material and the solid electrolyte, improves the high-voltage resistance performance of the solid electrolyte, and reduces side reactions between the ternary positive electrode and the solid electrolyte and the electrolyte decomposition caused by high voltage. On the other hand, the fast ion conductor property of LixMyFx+3y effectively improves the lithium ion conductivity of the ternary positive electrode material and reduces the residual lithium on the surface of the ternary positive electrode material.

The invention relates to a lithium cobalt oxide composite material and a preparation method thereof, an electrode plate and a battery. The lithium cobalt oxide composite material comprises a lithium cobalt oxide core and a shell coating at least part of the surface of the lithium cobalt oxide core, and the lithium cobalt oxide core comprises first lithium cobalt oxide and second lithium cobalt oxide; the median particle size of the first lithium cobalt oxide is d1, the median particle size of the second lithium cobalt oxide is d2, the median particle size of a precursor first cobalt source of the first lithium cobalt oxide is d3, and d3 is larger than or equal to 3 microns and smaller than or equal to 5 microns; the median particle size of a second cobalt source of a precursor of second lithium cobalt oxide is d4, and d4 is more than or equal to 3 microns and less than or equal to 5 microns; wherein d1-d3 is more than or equal to 10 microns and less than or equal to 17 microns; 0 [mu] m < = d2-d4 < = 3 [mu] m. According to the preparation method, the compaction density of the lithium cobalt oxide composite material can be effectively improved, so that the specific capacity and the cycle performance of the lithium ion battery are improved.

The invention provides a high-performance all-solid-state electrolytic tank for producing hydrogen by electrolyzing water and a preparation method of the high-performance all-solid-state electrolytic tank. The preparation method mainly comprises the following steps: preparation of electrode powder: preparing (La0. 6Sr0. 4) 0.95 Co0. 2Fe0. 8O3-delta (LSCF) powder by adopting a liquid-phase synthesis method, and preparing MxCe1-xNyO2 powder by adopting a coprecipitation method for an electrode and an isolating layer; preparing a half cell by adopting a co-casting process; an isolating layer and an oxygen electrode are prepared by adopting a silk-screen printing technology, and high-content water vapor is introduced to realize hydrogen production by electrolyzing water. The prepared high-performance all-solid-state electrolytic tank has efficient water electrolysis hydrogen production catalytic activity and Faraday efficiency, can operate at the medium-high temperature of 650-850 DEG C, and can effectively reduce electric energy consumption and improve energy conversion efficiency.

The invention provides a near-pure-phase O2 type lithium cobalt oxide positive electrode material and a preparation method and application thereof.According to the method, a P2 type near-pure-phase NCO precursor material with the high Na / Co specific content is adopted for successfully synthesizing a near-pure-phase O2 type LCO material through Li-Na ion replacement, the Li / Co atomic ratio ranges from 0.9 to 1.2, the content of free Li2CO3 of the material is smaller than or equal to 0.5 wt.%, the content of Li < + > occupied by the structure is high, and the material can be applied to the field of lithium ion battery cathode materials. And an X-ray diffraction pattern has no miscellaneous peaks except the O2-type structure. Therefore, by selecting reasonable doping modification and primary sintering conditions, a near-pure-phase P2 type NCO precursor material with a high Na / Co ratio synthesized in an air atmosphere is provided, and a high-proportion structure of the P2 type precursor material occupies Na, good Na < + > diffusion dynamics performance and a stable structure are utilized, so that the high-purity NCO precursor material is obtained. And the near-pure-phase O2 type lithium cobalt oxide positive electrode material with high Li / Co ratio, low free Li2CO3 content, low Na < + > residue and stable structure is synthesized through Li-Na ion replacement.