1642results 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 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 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 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 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.

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 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 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.

The invention provides a wet treatment process for laterite-nickel ore. The wet treatment process comprises the following steps: S1, carrying out acid leaching treatment on the laterite-nickel ore by adopting inorganic acid to obtain leached ore pulp; s2, the leached ore pulp is sequentially subjected to liquid-solid separation and countercurrent washing, and washed pulp and leached residues are obtained; s3, a first oxidizing agent and a first neutralizing agent are added into the washed slurry for iron and aluminum removal treatment, and a solution with iron and aluminum removed and iron and aluminum slag are obtained; s4, carrying out nickel and cobalt precipitation treatment on the solution subjected to iron and aluminum removal, so as to obtain precipitated slurry; s5, continuously carrying out dense separation treatment on the precipitated slurry to obtain underflow and overflow; and S6, the underflow is subjected to washing aftertreatment in sequence, and a cobalt nickel hydroxide product is obtained. The invention provides a short-process wet treatment process for laterite-nickel ore, the production cost and energy consumption are reduced, and meanwhile, the recovery rate of nickel and cobalt, the overall recovery rate of scandium and the quality of nickel-cobalt oxide products are improved.

In order to solve the problems that an existing positive electrode material is unstable in structure and low in energy density, the invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium cobalt oxide of a layered structure, the chemical formula of the lithium cobalt oxide is Li < 1-alpha-beta > Na < alpha > (Mg < gamma > Ti < delta > Co < 1-gamma-delta >) O2, alpha is smaller than or equal to 0.005, and beta is 0.02-0.05; gamma is equal to 0.002 to 0.004, delta is equal to 0.001 to 0.003, and gamma + delta is equal to 0.003 to 0.006.

The invention discloses a preparation and application method of active magnesium oxide for cobalt precipitation, which comprises the following steps: adding acetate during preparation of an active magnesium oxide precursor magnesium hydroxide to obtain magnesium hydroxide with a double-tooth structure; when magnesium oxide is prepared through calcination, conversion from magnesium hydroxide to magnesium oxide can be achieved at a low temperature, and meanwhile high activity is obtained; and finally, the magnesium oxide slurry is added into the cobalt precipitation pre-solution for cobalt precipitation, the cobalt precipitation effect is good, and the obtained coarse cobalt hydroxide cobalt is high in grade. The magnesium hydroxide regulating agent is used for promoting generation of magnesium oxide rich in active sites, the magnesium hydroxide regulating agent is applied to the wet metallurgy cobalt deposition process, the cobalt deposition effect of active magnesium oxide prepared through a chemical method is effectively improved, other methods except for the method for reducing the particle size and promoting the activity of magnesium oxide are developed, acetate is selected as the magnesium hydroxide regulating agent, the dosage is small, and the cost is low. Magnesium oxide obtained through calcination is high in purity, the cobalt deposition process is not affected, unit consumption of magnesium oxide can be reduced, and cost is saved.

To provide a positive electrode active material with high capacity and good cycle characteristics.SOLUTION: A positive electrode active material exhibits minimal change in crystal structure between the charged and discharged states. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of about 4.6 V exhibits less change in crystal structure and volume between charge and discharge than known positive electrode active materials. When this pseudo-spinel crystal structure is present, diffraction peaks appear at 2θ=19.30±0.20° and 2θ=45.55±0.10° when analyzed by XRD.SELECTED DRAWING: Figure 1

The invention discloses a high-performance sodium ion battery negative electrode ZnS / CoS (at) C composite material and a preparation method thereof, the material preparation method has the characteristics of definite control parameter, easy purity control, simple operation, good process repeatability and the like, and the prepared sodium ion secondary battery negative electrode material has excellent sodium ion intercalation and deintercalation capability and can be used for preparing a sodium ion secondary battery negative electrode material. The specific capacity, the cycling stability, the coulombic efficiency and the rate capability of the sodium ion secondary battery can be effectively improved, the requirements of different conditions can be met, and the application prospect is wide.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

A lithium-supplementing additive and a preparation method therefor, a positive electrode material, a positive electrode sheet, and a battery. The lithium-supplementing additive comprises a lithium-containing compound, the lithium-containing compound is selected from one or a combination of more compounds as represented by the following chemical formula: aLiFeαMnβM1-α-βO2-γXγ(1-a)Li2FeδMnεN1-δ-εO3-ηXη, where the element M and the element N are each independently selected from one or more of Zr, Co, Sr, Al, Ni, W, Ti, Cu, Mg, Zn, Ca, Ba, Sc, Ga, Y, La, In, Ce, Ge, Hf, Sn, Nb, Ta, V and Sb, the X is the element F, 0.4≤a≤0.9, 0<α≤1, 0≤β≤1, 0<α+β≤1, 0≤γ≤0.1, 0<δ≤1, 0≤ε≤1, 0<δ+ε≤1, and 0≤η≤0.1. The lithium-supplementing additive can stably and uniformly supplement lithium and improve the cycling stability.

The invention discloses a high-entropy layered metal hydroxide composite material as well as a preparation method and flame-retardant and smoke-suppression application thereof. In order to solve the problems of single component limitation and function imbalance of traditional LDHs, the component limitation of the traditional LDHs is broken through high-entropy effect design, and a flame-retardant system which is stable in wide temperature range and high in smoke suppression efficiency is constructed through cooperation of multiple metals. The high-entropy metal hydroxide flame-retardant smoke-suppression composite material for the electric wires and cables has the characteristics of efficient flame retardance, smoke suppression, greenness, high mechanical strength and the like, achieves excellent flame-retardant, smoke-suppression and toxicity-reduction effects when being used in the processing process of thermoplastic polyurethane for the electric wires and cables, and is free of pollution to the environment and human bodies.

Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. The cobalt ferrite particles are obtained by a method for producing cobalt ferrite particles, including performing a thermal treatment on an aqueous solution containing a divalent iron salt and a divalent cobalt salt stabilized by a complexing agent (ferrite precursor).

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a preparation method thereof and a battery. The composite positive electrode material comprises a positive electrode substrate, a fast ion conductor layer and a halide layer, the positive electrode substrate comprises a doped lithium cobalt oxide material; the fast ion conductor layer is positioned on the surface of the positive electrode substrate and comprises an oxide of a metal element Q with a spinel phase; the halide layer is located on the surface of the fast ion conductor layer and comprises element lithium, metal element M and halogen X. Through coordination and cooperation of the matrix material, the fast ion conductor layer and the halide layer, the structural stability and the surface morphology of the material can be effectively improved, the defects of the material are overcome, and the composite positive electrode material has excellent conductivity and has excellent cycling stability and rate capability at high temperature and / or high voltage, so that the battery has high safety performance.

The present invention generally relates to a field of material science and chemistry. Specifically, the present invention relates to synthesis and characterization of lead-free hybrid organic-inorganic Perovskite compounds for metal ion sensing applications. More particularly, the present invention relates to lead-free low dimensional manganese (Mn)- and copper (Cu)- based hybrid organic-inorganic perovskites (HOIPs) for visual fluorometric Pb2+ ion detection. Further, the present invention relates to synthesis of lead-free low dimensional manganese (Mn)- and copper (Cu)-based hybrid organic-inorganic perovskites (HOIPs) via mechanochemical synthesis methodology.

The invention discloses an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the field of lithium ion battery electrode materials. The preparation method comprises the following steps: uniformly mixing a cobalt precursor containing modified metal M with sodium carbonate by a dry method, pre-sintering after uniformly mixing, and sintering at high temperature to obtain P2-phase NaxCoO2; and carrying out solid-phase ion exchange or liquid-phase ion exchange with a lithium salt, washing, filtering and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material prepared by the invention has good structural reversibility under high voltage, and the capacity, cycle and other performance of the lithium ion battery positive electrode material under high voltage can be remarkably improved.

The invention discloses a ferrate nanocage superstructure material and a preparation method and application thereof, the preparation method comprises the following steps: preparing a zinc-iron Prussian blue nanocube precursor material, then dispersing the precursor material in deionized water, and standing and aging for 24-120 hours at 15-45 DEG C to obtain a zinc-iron Prussian blue nanocage; the preparation method comprises the following steps of: dispersing in diluted hydrochloric acid, adding metal salt, uniformly stirring, standing and reacting for 6-48 hours at the temperature of 50-120 DEG C, filtering, washing, drying, and annealing for 1-5 hours at the temperature of 300-500 DEG C; according to the invention, the zinc-iron Prussian blue nanocube is used as a precursor, the zinc-iron Prussian blue nanocage is obtained through aging, and the ferrite nanocage superstructure material is prepared through ion exchange and has excellent gas-sensitive characteristic.

The invention discloses a high-exposure-ratio {010} active surface O2 type cobalt-based layered oxide and a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode material preparation. Comprising the following steps: preparing a cobalt-based hydroxide precursor with a large {010} crystal face area through a coprecipitation method, introducing a sodium source, preparing a sodium-embedded cobalt-based layered oxide through a high-temperature calcination method, and carrying out a low-temperature ultrasonic liquid-phase ion exchange reaction on the sodium-embedded cobalt-based layered oxide and a lithium salt solution to prepare the {010} active face O2 type cobalt-based layered oxide with a high exposure ratio. According to the invention, by increasing the exposure ratio of the {010} active surface, the structural stability and lithium ion diffusion kinetics of the layered cobalt-based oxide positive electrode material are enhanced, so that the purposes of improving the energy density, rate capability and cycle performance of high-voltage O2 layered lithium cobalt oxide are achieved.

The invention provides a high-nickel positive electrode material with a cage-shaped oxygen fixing structure, a lithium ion battery and a preparation method. A LiTMO phase and a LiTMO2F2-alpha phase are formed in an inner core of the high-nickel positive electrode material, TM represents a transition metal element, and alpha < lt > is larger than or equal to 0; 0.1, the near surface layer is doped with a lithium-loving metal element L in a gradient manner, the metal element L and O form an L-O bond, and a perovskite phase coating layer is formed on the outer layer. According to the high-nickel positive electrode material, fluorine element doping is utilized, stable TM-F bonds are formed in the core, the main body structure of the material is stabilized, transition metal L elements are doped in the near surface layer of the material in a gradient manner to form L-O bonds, surface active oxygen can be effectively passivated, the outer edge of the material is coated with a perovskite phase, active oxygen escaping from the surface can be captured, and the high-nickel positive electrode material can be applied to the field of lithium ion batteries. The high-nickel ternary material with a cage-shaped solid oxygen structure is jointly constructed from inside to outside, so that the material is prevented from being eroded by hydrofluoric acid and moisture, and the structure and thermal stability of the material are improved while precipitation of active oxygen is inhibited.

The invention discloses cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microspheres as well as preparation and application thereof, and relates to the technical field of electrochemical energy storage devices. Carboxylated polystyrene microspheres, soluble zinc salt and cobalt salt, phosphomolybdic acid and 2-methylimidazole are dispersed in methanol, a PMA (at) ZnCo-ZIFs / PS precursor of a spherical structure is obtained, then the PMA (at) ZnCo-ZIFs / PS precursor is placed in an inert atmosphere for carbonization treatment, and the cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microsphere material is obtained. According to the structure and the preparation method, the nitride / metal cobalt component and the nitrogen-doped sodium affinity sites are introduced at the same time, uniform transportation and nucleation of sodium ions are effectively induced, sodium metal is guided to deposit in a specific three-dimensional structure, growth of sodium dendrites is effectively inhibited, volume expansion of metal sodium in the reaction process is relieved, the preparation method is simple and convenient, and the preparation method is suitable for industrial production. The cost is low, the electrochemical performance of the sodium metal battery assembled by using the composite material can be remarkably improved, and the composite material has a good large-scale application prospect.

This invention relates to an in-situ detection system for a rotating microliquid film reactor (MFR) for monitoring the nucleation behavior of nanomaterials. The reactor comprises a rotor and a stator, with a stator base angle of 70-85°, a rotational speed of 500-5000 rpm, and a slit width of 10-500 μm to ensure that fluid passing through the slit does not undergo backmixing and to create a strong shear field. A micro-negative pressure sampler is fabricated to capture nucleating particles within the high-speed shear field and bring them into the visible observation area. A high-speed camera and microscope objective are connected in situ, thereby acquiring instantaneous images of the nucleation process at the nanoscale and capturing the transient evolution behavior of crystal nuclei. The construction of this rotating MFR in-situ detection system solves the problems of poor micro-mixing effects and uncontrollable nucleation and growth in traditional stirred tank reactors, leading to poor quality in large-scale preparations, and the inability to observe phase transitions and instantaneous nucleation processes in a closed reactor. The obtained hydrotalcite nucleation results enrich non-classical nucleation theories and provide guidance for the large-scale preparation of nanomaterials.

The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage lithium cobalt oxide positive electrode material and a preparation method thereof. According to the technical scheme, the chemical composition of the positive electrode material is at least two elements selected from Al, Mg, Ti and Zr. Through triple strategies of multi-element synergistic doping, core-shell structure design and surface defect regulation and control, breakthrough improvement of the performance of the high-voltage lithium cobalt oxide positive electrode material is achieved, and especially through the synergistic effect of a specific element combination Al + Mg + Ti and the coupling effect of the gradient-distributed F element and the nanometer defect structure, the performance of the high-voltage lithium cobalt oxide positive electrode material is improved. The structure phase change and the interface side reaction in the high-pressure circulation process are effectively inhibited, and the cycle life and the thermal stability of the material are remarkably improved.