43 results about "Manganate" patented technology

This invention discloses a method and application for preparing oxygen-defect-containing lithium-doped manganese dioxide-carbon cloth composites from recycled waste lithium manganese oxide materials. The method involves reducing and leaching waste lithium manganese oxide cathode powder in a mixed solution of C2H4O2 and H2O2 to obtain a lithium manganese oxide leachate. The pH of the leachate is adjusted with ammonia water and used as an electrodeposition stock solution. Electrochemical deposition is performed on hydrophilic carbon cloth using constant voltage electrodeposition to obtain a MnO2-carbon cloth composite. The MnO2-carbon cloth composite is then used as an ion sieve and immersed in the electrodeposition solution for a period of time to obtain a lithium-ion-doped MnO2-carbon cloth composite. The lithium-ion-doped MnO2-carbon cloth composite is calcined in a muffle furnace to obtain an oxygen-defect-containing lithium-ion-doped MnO2-carbon cloth composite, which is used as a cathode material for zinc-ion batteries. This composite exhibits excellent zinc storage performance, with a specific capacity as high as 120 mAh / g after 1200 charge-discharge cycles at a current density of 1 A / g. Under ultra-high current density (A / g), the specific capacity remains stable at 75 mAh / g after 5000 charge-discharge cycles.

The application discloses a kind of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material and its preparation method;The application uses organic-inorganic hybrid fluoride manganese salt material as Mn 4+ Source preparation Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.The application uses organic-inorganic hybrid fluoride manganese salt material instead of all-inorganic fluoride manganese salt, manganese salt and permanganate as Mn 4+ Source, for preparing Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material, significantly improve the luminescent efficiency of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.

The application belongs to the technical field of lithium batteries, and discloses a modified lithium manganate electrode material and a modification method thereof.The modification method comprises the following steps: mixing lithium manganate with a hydrogen peroxide solution to obtain the surface-modified lithium manganate electrode material.Through the surface modification method, the surface impurities of the spinel lithium manganate can be effectively removed without obvious influence on the crystal structure, the surface smoothness is improved, the diffusion rate of Li + is accelerated, the agglomeration of the spinel lithium manganate particles is effectively inhibited, and thus the phenomenon that the internal stress between the agglomerated particles causes micro-cracks on the surface of the material is effectively inhibited.The surface-modified lithium manganate electrode material has excellent electrochemical performance.The surface modification method is simple, low in cost, and suitable for industrial production.The application has low requirements on equipment, is simple to operate, has no special requirements on the production process, causes no pollution in the production process, and is friendly to the environment.

The application provides a positive electrode sheet and application thereof. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material; the positive electrode active material comprises spinel lithium manganate and a ternary material; the X-ray diffraction pattern of the positive electrode sheet comprises a first characteristic peak with 2theta of 18.7+ / -0.5 degrees, a second characteristic peak with 2theta of 44.1+ / -0.2 degrees, a third characteristic peak with 2theta of 44.6+ / -0.2 degrees and a fourth characteristic peak with 2theta of 64.3+ / -0.5 degrees; the first characteristic peak has a peak intensity I1, the second characteristic peak has a peak intensity I2, the third characteristic peak has a peak intensity I3, and the fourth characteristic peak has a peak intensity I4; wherein I1 / (I2+I3) is greater than or equal to 2 and I2 / I4 is greater than or equal to 2. The application can ensure the stability of the positive electrode sheet and improve the cycle performance of the battery.

The application discloses a flexible lithium manganate positive pole piece and a preparation method, and belongs to the technical field of lithium ion batteries. The carbon nanofiber membrane with polystyrene sulfonate grafted on the surface and the lithium manganate particles with polystyrene sulfonate adsorbed on the surface are assembled into a filter cake layer in close contact through vacuum filtration, then aniline solution slowly permeates through the filter cake layer and is adsorbed under the condition of no oxidant, so that the aniline monomers are uniformly adsorbed on the polystyrene sulfonate template to form a monomer reaction layer with uniform thickness, and in-situ limited polymerization is carried out, after polymerization and drying, the obtained composite membrane is subjected to gradient heating and hot pressing treatment, rearrangement of polyaniline molecular chains and further compaction at the interface between the carbon fiber and the lithium manganate are realized, and the flexible self-supporting positive pole piece with a positive active film layer free of metal current collectors, a three-dimensional conductive network and a relatively stable conductive state is obtained. The application is suitable for the fields of flexible lithium ion batteries, wearable electronic devices and solid-state lithium batteries.

The application belongs to the technical field of lithium ion battery materials, and particularly relates to a modified lithium manganate positive electrode material and a preparation method and application thereof; the method takes spinel lithium manganate as a matrix, uniformly loads tellurium-doped lithium pyrovanadate and defect type niobium tungsten oxygen compound on the surface of lithium manganate particles through wet mixing, removes organic dispersants through stepwise heating and holding in an air atmosphere after drying, then switches to inert atmosphere to continue heating and sintering, and finally cools down under the protection of inert atmosphere to obtain a modified product. The tellurium-doped lithium pyrovanadate is prepared through a peroxovanadic acid complex sol-gel method, and the defect type niobium tungsten oxygen compound is prepared through an argon-hydrogen mixed gas reduction method and is completely isolated from air. The application forms a composite layer of coating and grain boundary modification on the surface of lithium manganate through the synergistic effect of the two modified compounds, effectively inhibits manganese dissolution and lattice distortion, and at the same time, the oxygen vacancy structure is preserved under the protection of inert atmosphere, so that the cycle stability and electrochemical performance of the material are significantly improved.

An air cathode and an aluminum-air battery, wherein the air cathode contains an active material, the active material being any one or a mixture of two of the following materials: nickel oxide, iron oxide, manganese oxide, lithium-ion nickel oxide, lithium-ion iron oxide, lithium-ion manganese oxide; strontium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; calcium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; magnesium titanate doped with any one or two of iron, nickel, manganese, and lanthanum; lanthanum nickelate doped with calcium and / or strontium; lanthanum ferrite doped with calcium and / or strontium; lanthanum cobaltate doped with calcium and / or strontium; lanthanum manganate doped with calcium and / or strontium; and graphite or metal carbonitride loaded with a metal.

The application provides a modified nickel-cobalt-manganese lithium manganate positive electrode material and a preparation method and application thereof, and relates to the technical field of battery materials.The modified nickel-cobalt-manganese lithium manganate positive electrode material comprises NCM@IPDI and a polyaniline layer coated on the surface of the NCM@IPDI, wherein the NCM@IPDI comprises a nickel-cobalt-manganese lithium manganate positive electrode material and an isophorone diisocyanate layer grafted on the surface of the nickel-cobalt-manganese lithium manganate positive electrode material.The modified nickel-cobalt-manganese lithium manganate positive electrode material has double protective layers of an organic small molecule (namely isophorone diisocyanate) and a conductive polymer (namely polyaniline), can effectively inhibit the side reaction of the positive electrode material and electrolyte, reduce the dissolution of metal ions, improve the electronic transmission efficiency, and fundamentally improve the energy density and cycle life of a lithium battery.

The application belongs to the technical field of catalysts and their applications, and relates to a metal-based composite nanocatalyst, a preparation method and application thereof. The metal-based composite nanocatalyst is obtained by forming an amorphous layer on the surface of Au / rare earth manganate and constructing a metal-support strong interaction through a NaBH4 aqueous solution reduction method at room temperature. The metal-based composite nanocatalyst constructed by the application has excellent catalytic oxidation activity and realizes high conversion rate of CO at room temperature.

The application discloses a spinel lithium manganate electrode material with selective crystal face passivation and a preparation method thereof. The electrode material comprises a spinel lithium manganate matrix and a disordered rock salt structure passivation layer selectively constructed on high-activity crystal faces such as {110} and {100} of the matrix; and the stoichiometric general formula of the matrix is Li x Mn 2‑y M y O4 (M is a doping element, 0.85<=x<=1.15, 0<=y<=0.25). The preparation method comprises the following steps: adding the matrix into specific acid liquid to obtain a crystal face selective acidization matrix, and then performing heat treatment to obtain the spinel lithium manganate electrode material with selective crystal face passivation. The application can effectively inhibit manganese dissolution, enhance the high-temperature surface structure stability of the material, and does not significantly affect the electrochemical capacity, and the process is simple, does not need complex equipment, and is easy for industrialized production.

The present application provides a positive electrode plate and the use thereof. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material; the positive electrode active material comprises spinel-type lithium manganate and a ternary material; the crystal X-ray diffraction pattern of the positive electrode plate contains a first characteristic peak having a 2θ of 18.7±0.5°, a second characteristic peak having a 2θ of 44.1±0.2°, a third characteristic peak having a 2θ of 44.6±0.2°, and a fourth characteristic peak having a 2θ of 64.3±0.5°, the intensity of the first characteristic peak being I1, the intensity of the second characteristic peak being I2, the intensity of the third characteristic peak being I3, and the intensity of the fourth characteristic peak being I4, wherein I1 / (I2+I3) is ≥ 2 and I2 / I4 is ≥ 2.

The application belongs to the technical field of new energy, and particularly relates to a positive electrode active material, a secondary battery and an electric device. The positive electrode active material provided by the application comprises: a core, wherein the core comprises lithium manganate, the lithium manganate contains a first transition metal element and a second transition metal element, the first transition metal element comprises at least one of Al, Ti, Nb, Zr, Sn and Ta, and the second transition metal element comprises at least one of Ni, Co, V, Mg, Zn and Ru; a first shell layer arranged on at least part of the surface of the core, wherein the first shell layer contains a fast ion conductor material; and a second shell layer arranged on at least part of the surface of the first shell layer, wherein the second shell layer contains a fluorine-containing lithium silicate. The positive electrode active material provided by the application has a low unit cell volume expansion rate, a low manganese element elution rate and a high average valence of manganese, so that the battery has good rate performance and high-temperature cycle performance.

This invention discloses a manganese-activated organic-inorganic hybrid fluoride red fluorescent ceramic, its preparation method, and its applications. The invention obtains the manganese-activated organic-inorganic hybrid fluoride red fluorescent ceramic by cold pressing and sintering the manganese-activated organic-inorganic hybrid fluoride red phosphor, followed by cooling; or by uniformly mixing a manganese-activated organic-inorganic hybrid fluoride matrix and fluoromanganate, followed by cold pressing and sintering, and then cooling. The manganese-activated organic-inorganic hybrid fluoride red fluorescent ceramic prepared by this invention has high transparency and can be effectively excited by ultraviolet, near-ultraviolet, and blue light, emitting high-purity narrow-band red light at approximately 631 nm. It exhibits high absorption efficiency for blue light and high luminous efficiency, making it suitable for applications in white LEDs and high-power laser devices. The preparation process of the red fluorescent ceramic of this invention is simple, mild, widely applicable, and low-cost.

The application relates to the technical field of wave-absorbing materials, and particularly discloses a metal element doped lithium ion compound wave-absorbing coating and a preparation method thereof. The lithium ion wave-absorbing material is directly prepared into a plasma spraying slurry after a mixing and grinding of a synthesis raw material (manganese dioxide and a lithium-containing compound) and a doped metal (Fe, Cu, Ni, Al and the like), a wave-absorbing material (i.e. lithium manganate) is synthesized in a spraying process, and a plurality of process steps such as wave-absorbing material preparation, granulation and spraying are concentrated into one, so that the process is simpler, and since the doped metal is mixed with the synthesis raw material first, the doped metal is directly doped in a microcrystal structure of the lithium manganate compound, a wave-absorbing material with better uniformity is formed, and the technical problem that the preparation of the wave-absorbing material, the preparation of the master batch and the preparation of the coating are carried out in steps, the process is complex and loss is prone to occur in the prior art is solved.

The present application relates to an electrochemical device comprising a positive electrode sheet, a negative electrode sheet, and an electrolyte, the negative electrode sheet comprising a negative electrode active layer, the positive electrode sheet comprising a positive electrode active layer, the positive electrode active layer comprising a positive electrode active material, the positive electrode active layer comprising an aluminum element, wherein a content A (mmol) of the aluminum element in the positive electrode active layer and a total area B (mm 2 ) of the negative electrode active layer satisfy: 3≤A / B≤25, the positive electrode active material comprising lithium manganate and a manganese-containing compound.

This invention discloses a lanthanum strontium manganate perovskite-type oxygen electrode material, a solid oxide electrolytic cell, its preparation method, and its application. The oxygen electrode material is a cubic perovskite-type oxide, lanthanum strontium manganate, prepared by a molten salt method, with the general chemical formula La. a Sr b MnO 3‑δ Where a+b=1, and δ represents the non-stoichiometric ratio of oxygen in the material. Compared to the irregularly shaped lanthanum strontium manganate prepared by the sol-gel method, the lanthanum strontium manganate disclosed in this invention exhibits better electrochemical methane oxidative coupling performance. Further, by coating and sintering bismuth oxide or yttrium / sammarium co-doped bismuth oxide onto this electrode, a composite electrode can be obtained. This composite electrode can further improve the selectivity of ethane and ethylene and the methane conversion rate. When carbon dioxide is used as the cathode reactant, this electrode and its composite electrode can significantly reduce the electrolysis potential of carbon dioxide electrolysis through coupling the methane oxidative coupling reaction, and are considered to have good application prospects in the field of solid oxide electrolyzers.

The application discloses a method for preparing a high-nickel positive electrode material with a double-layer coated nanolayer, which comprises the following steps: first, preparing a high-nickel positive electrode material; then, coating lithium iron phosphate on the high-nickel positive electrode material; bridging glucose acid based on the coating layer of lithium iron phosphate; and then, coating lithium manganate; and finally, combining the lithium iron phosphate layer and the lithium manganate layer through the glucose acid. The method improves the binding force of the double-layer coating, improves the structural stability of the high-nickel positive electrode material, avoids peeling of the coating layer, and improves the charge-discharge cycle performance.

The application discloses a coated modified lithium manganate positive electrode material and a preparation method and lithium battery thereof, and belongs to the technical field of positive electrode materials. The coated modified lithium manganate positive electrode material comprises: an inner core, the inner core is LiMn2O4, a first coating layer, the first coating layer is coated on at least part of the surface of the inner core, and the coating material is FePO4; a second coating layer, the second coating layer is coated on at least part of the surface of the first coating layer, and the coating material is LiFePO4; and a third coating layer, the third coating layer is coated on at least part of the surface of the second coating layer, and the coating material is carbon. The application takes lithium manganate (LMO) as the inner core, and sequentially coats a composite structure of iron phosphate (FePO4), lithium iron phosphate (LFP) and a carbon layer from inside to outside, so that the three are used to construct a system of "inner layer adaptive foundation building-middle layer active buffering-outer layer conductive stability", and the specific capacity, rate performance, cycle life and high-temperature stability of the lithium manganate positive electrode material are significantly improved.

The application discloses a method for preparing modified molybdenum disulfide material by adopting sodium thiosulfate assisted ball milling and application thereof, and belongs to the field of water treatment and environmental functional material. The modified molybdenum disulfide material is prepared by adopting a sodium thiosulfate assisted ball milling method, and the sodium thiosulfate addition amount is 0.1-2.0 g per gram of molybdenum disulfide. The material is used for activating permanganate to treat wastewater containing antibiotics and heavy metals, and can be efficiently operated under weak acid to neutral conditions. Among them, singlet oxygen and high-valence manganese species dominate the oxidative degradation of antibiotics, and the in-situ generated amorphous manganese dioxide removes heavy metals through adsorption fixation. The method solves the problems of low efficiency and single function of the traditional heterogeneous activation system, has high and stable synergistic purification capacity for water bodies with antibiotic and heavy metal composite pollution, and is especially suitable for the advanced treatment of reclaimed water.

This invention relates to the field of lithium extraction technology from salt lakes, specifically to an array-type nanosheet lithium manganese oxide material for lithium extraction, its preparation method, and its application. The preparation method includes a three-electrode chemical system consisting of carbon cloth as the working electrode, a graphite plate as the counter electrode, and Ag / AgCl as the reference electrode. This system is immersed in a mixed solution of manganese acetate and sodium sulfate, and an array-type nanosheet manganese hydroxide is prepared by electrolysis. The array-type nanosheet manganese hydroxide is oxidized to manganese tetroxide at room temperature, and then subjected to hydrothermal lithiation to obtain the array-type nanosheet lithium manganese oxide material. The array-type nanosheet lithium manganese oxide material prepared by this invention has high crystallinity, is dense and uniform, and exhibits more active sites, higher lithium uptake capacity, and lower manganese dissolution rate in lithium extraction from salt lakes, demonstrating better lithium extraction performance compared to existing commercial lithium manganese oxide materials.

A method includes providing a precursor powder mixture containing lanthanum oxide particles, strontium oxide particles, manganese oxide particles and cobalt oxide particles and calcining the precursor powder mixture, such that a lanthanum strontium manganate-manganese cobalt oxide composite powder containing composite particles including perovskite and spinel phases is formed.

This invention discloses a lithium manganese oxide cathode material, its preparation method, and its applications, relating to the field of lithium-ion battery technology. The invention involves sequentially coating a lithium manganese oxide substrate with a phosphate ester coating layer and a hafnium oxide surface layer. The phosphate ester coating layer is grafted using phosphate ester bonds (P-O-Mn), and the hafnium oxide surface layer is bonded via covalent bonds (Hf-O-Mn), significantly improving interfacial adhesion and eliminating the risk of detachment. Furthermore, hafnium oxide (HfO2) exhibits high ionic conductivity (approximately 10). ‑6 S / cm), does not hinder Li + Therefore, the coating structure provided by this invention can effectively suppress the dissolution of Mn and improve the cycling stability of the material while ensuring material capacity.

The application discloses a kind of polymer composite solid electrolyte with surface modified lithium manganate as filler and a preparation method thereof, and belongs to the technical field of lithium ion battery.The method is according to the molar ratio of P:Mn 0.1-5% respectively to take LiPF6 and lithium manganate, after grinding, solid phase sintering is carried out, by the interface reaction of LiPF6 and lithium manganate under controlled conditions, in-situ construction of composite inorganic interface layer composed of Li3PO4 and LiF on the surface of lithium manganate particles.The interface layer can inhibit the dissolution of manganese ions and improve the interfacial compatibility of the filler and polymer matrix, thereby improving the ion transport performance and interface stability of the composite electrolyte.The application also provides a polymer solid electrolyte containing the composite filler and a preparation method thereof, as well as a full solid-state lithium battery using the electrolyte.The preparation process of the application is simple, the cost is controllable, and has good industrial application prospect.

The present application relates to an electrochemical device, which comprises a positive electrode plate, a negative electrode plate and an electrolyte, wherein the negative electrode plate comprises a negative electrode active layer; the positive electrode plate comprises a positive electrode active layer; the positive electrode active layer comprises a positive electrode active material; the positive electrode active layer comprises aluminum, wherein the content A (mmol) of aluminum in the positive electrode active layer and the total area B (m2) of the negative electrode active layer satisfy: 3 ≤ A / B ≤ 25; and the positive electrode active material comprises lithium manganate and a manganese-containing compound.

The application discloses a lithium titanate battery and relates to the technical field of batteries.The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, wherein the electrolyte is added with an adduct synthesized from dimethyl fumarate and benzidine in a specific molar ratio as a viscosity regulator, which effectively reduces the viscosity growth trend of the electrolyte at low temperature and improves the migration rate of lithium ions.The electrolyte further comprises lithium salt, organic solvent and auxiliary additives, which are beneficial to optimizing the low-temperature performance and cycle stability of the battery.The positive electrode active material is one or more of lithium iron phosphate, lithium manganate, lithium cobaltate or nickel-manganese-cobalt ternary material, and the negative electrode active material is lithium titanate, which is further combined with additives such as lithium nitrate and fluoroethylene carbonate, so that the capacity retention rate and charge-discharge efficiency of the battery at an extreme low temperature environment of-40 DEG C are significantly improved.The lithium titanate battery provided by the application has excellent low-temperature adaptability, safety and long cycle life, and is suitable for high-cold-area power batteries and energy storage system applications.

The utility model discloses a lithium manganate raw material magnetic separation iron removal device relates to magnetic separation technical field. A lithium manganate raw material magnetic separation iron removal device, including conveying table and conveying mechanism no.