220 results about "Composite cathode" patented technology

The invention discloses a low-porosity and low-impedance dry positive electrode of a solid-state battery and a preparation method of the low-porosity and low-impedance dry positive electrode. The dry positive electrode of the solid-state battery comprises a large-particle positive electrode active material, a small-particle positive electrode active material, a first conductive agent, a second conductive agent, a third conductive agent, a small-size sulfide solid electrolyte, a large-size sulfide solid electrolyte and a binder. All the components are mixed in a manner of size matching and step-by-step embedding. Size matching among multi-stage particles is introduced, so that the size of gaps among different components is reduced, and the porosity is reduced; the binding agent and part of the conductive agent are premixed to form a'binding-conductive double network ', and then the active material and the electrolyte are gradually embedded, so that the purpose of low impedance of the composite positive electrode is achieved. And finally, the rate capability and the cycling stability of the solid-state battery are improved.

The invention discloses a positive electrode material formed by compounding polyanionic sodium ferric sulfate and a layered transition metal oxide, and a preparation method and application thereof, and the preparation method comprises the following steps: preparing a sodium ferric sulfate positive electrode material, preparing a layered transition metal oxide positive electrode material, and mechanically mixing the sodium ferric sulfate and the layered transition metal oxide material, the composite material is obtained. The production process of the two materials is easy for large-scale production, has high similarity with the existing battery industrial equipment, is simple in method for compounding the two materials, and has large-scale industrial application value. The composite material has the stability of a polyanionic material and the high energy density of a layered oxide material, and has more excellent comprehensive electrochemical performance.

A method for manufacturing composite cathode particles based on a dual-coated ternary oxide for an electrochemical battery by a high speed rotation includes the steps of: placing a plurality of large NCM (lithium nickel manganese cobalt oxide) particles and a glass phase material into a first mixer for stirring by a first high speed rotation to form a plurality of glass-phase-layer-contained NCM particles; then mixing a plurality of small LLZO particles and the glass-phase-layer-contained NCM particles by a second high speed rotation of a second mixer to form a plurality of composite NCM particles; and then mixing the composite NCM particles, a plurality of first carbon nanotubes and a plurality of nanoscale amorphous carbons to form a plurality of carbon-material-contained positive electrode particles.

The present application belongs to the technical field of secondary batteries, and specifically relates to a lithium iron phosphate composite cathode active material, and further discloses a preparation method thereof, as well as an application thereof for use in the preparation of battery plates and secondary batteries. The lithium iron phosphate composite cathode active material of the present application comprises a core containing a lithium iron phosphate material and iron phosphide particles, as well as a carbon coating layer and / or a LiBO2-containing coating layer at least partially coated on the surface of the core.

The invention discloses a composite cathode material integrating electrocatalysis and ozone oxidation functions, a preparation method and application. The composite cathode material is composed of oxidized carbon nanotubes, cuprous oxide and copper oxide. The copper loading capacity of the composite cathode material is 1-10wt.%; the diameter of the oxidized carbon nanotube is 5 to 10 nm; the mass ratio of the oxidized carbon nanotubes to the cuprous oxide to the copper oxide is (298-27): (3.0-2.5): (0-1). A composite cathode material integrating electrocatalysis and ozone oxidation functions is elaborately designed and prepared and is applied to an electrocatalytic ozone coupling system, and continuous and efficient attack on antibiotic molecules and degradation intermediates thereof is realized by utilizing multiple synergistic effects among all components of the material and in the electrocatalytic ozone process, so that the electrochemical performance of the composite cathode material is improved. Therefore, the technical bottleneck of low TOC removal rate in the traditional advanced oxidation process is broken through, and a new technical approach is provided for thoroughly eliminating the antibiotic risk in the water environment.

This invention provides a TiS2 composite cathode and an all-solid-state battery device, employing a sulfide solid electrolyte with lithium replenishment and moisture absorption properties, and using TiS2 as the cathode active material. The sulfide solid electrolyte has the following chemical composition: Li 7+y‑ z M y As 1‑y S 6‑z X z Where M is Si, X is a halogen element, 0.3≤y≤0.9, 0≤z≤2. This invention yields a positive electrode with ultra-high load capacity, ultra-long cycle life, and the ability to charge and discharge at ultra-high rates and ultra-high current densities, as well as an all-solid-state battery.

The application discloses a composite positive electrode material and a preparation method thereof, a positive electrode sheet, a secondary battery and an electric device. x Ni a Co b Mn c M d ]O2, x+a+b+c+d=1, 0<a、b、c<1, 0≤d≤0.05, 0≤x, the element M includes one or more of Al, B, Zr, Sr, Y, Sb, Ta, Na, K, W, Ti, Mg, Nb, Hf, Mo, Ce, the span of the composite positive electrode material is 1.2-2.0, the composite positive electrode material includes a first lithium-rich manganese-based positive electrode material and a second lithium-rich manganese-based positive electrode material, the primary particles of the first lithium-rich manganese-based positive electrode material are rod-shaped particles, the length of the rod-shaped particles is 0.1-1.5 μm, and the Dv50 of the secondary particles is 3-8 μm; the primary particles of the second lithium-rich manganese-based positive electrode material are spherical-like particles, the diameter of the spherical-like particles is 0.1-400 nm, and the Dv50 of the secondary particles is 8-20 μm. Through the control of the Dv50 of the secondary particles, the span of the composite positive electrode material and the morphology and size of the primary particles, the composite positive electrode material has a high tap density, and the secondary battery has good cycle performance.

This invention belongs to the technical field of sodium-ion battery electrode materials, specifically relating to a preparation method and application of an air-stable molten asphalt-coated sodium selenide composite cathode sodium replenisher. The invention first prepares pure-phase sodium selenide nanoparticles in a glove box by room temperature stirring. Then, asphalt is grown in situ on the surface of the sodium selenide through ball milling and high-temperature calcination, thereby forming a core-shell structured sodium selenide composite sodium replenisher material coated with molten asphalt. The resulting composite sodium replenisher is stable in air for extended periods without deterioration, while simultaneously reducing the decomposition potential of sodium selenide and improving its decomposition efficiency. Coupled with a layered oxide cathode, it can achieve cathode sodium replenishment, compensating for the loss of active sodium caused by the growth of the SEI film on the surface of the hard carbon anode. Furthermore, its decomposition product, selenium, can inhibit the lattice oxygen evolution of the layered oxide cathode, improving the structural stability of the cathode and thus effectively enhancing the battery's initial efficiency and cycle performance, demonstrating promising commercial application prospects.

This invention provides a cobalt foam-carbon nanotube composite cathode material, its preparation method, and its applications, relating to the field of cathode material preparation technology. The composite cathode material of this invention is obtained by depositing a carbon nanotube array on a cobalt foam substrate. As a cold cathode material for field emission, this composite cathode material exhibits low turn-on and threshold electric fields, high current density, excellent field emission performance, and excellent current stability, meeting the performance requirements of field emission cathode materials. Furthermore, the preparation method of this composite cathode material is safe and simple. This invention provides a novel cathode material solution for high-performance, long-life vacuum electronic devices, with promising application prospects.

This invention discloses a hierarchical porous graphene oxide-coated sodium iron phosphate pyrophosphate composite material, its preparation method, and a method for preparing a sodium-ion battery cathode using the aforementioned hierarchical porous graphene oxide-coated sodium iron phosphate pyrophosphate composite material. This invention utilizes the efficient electron and ion transport pathways of hierarchical porous graphene oxide to modify the sodium iron phosphate pyrophosphate cathode material, improving its ionic and electronic conductivity. Simultaneously, the hierarchical porous graphene oxide acts as a protective layer, reducing the volume expansion of sodium iron phosphate pyrophosphate during charge and discharge processes and increasing the material's cycle stability.

This application relates to a battery cell, a battery device, an electrical device, a composite cathode material, and a method for preparing the same. The battery cell provided in this application includes a positive electrode and a negative electrode. The positive electrode includes a positive current collector and a positive active layer stacked on at least one surface of the positive current collector. The positive active layer contains a composite cathode material, which includes a core and a coating layer covering the surface of the core. The core includes a lithium-manganese-based cathode active material, and the coating layer includes a tetrathiofulvalene compound. This application's battery cell uses a composite cathode material based on a tetrathiofulvalene compound coating a lithium-manganese-based cathode active material. The tetrathiofulvalene compound can improve the battery cell's capacity retention, specific capacity, and initial coulombic efficiency.

The application provides a lithium-rich manganese-based composite positive electrode material and a preparation method and application thereof, relates to the technical field of positive electrode material preparation, and the preparation method of the lithium-rich manganese-based composite positive electrode material comprises the following steps: firstly, a lithium-rich manganese-based material is prepared; then, pyrrole modified graphene oxide is prepared by reacting graphene oxide with pyrrole at 90-100 DEG C for 6-12 h; the lithium-rich manganese-based material and the pyrrole modified graphene oxide are uniformly dispersed in an organic solvent to obtain a mixed solution; the mixed solution is filtered, and the filter residue is dried at 60-80 DEG C for 6-12 h to obtain the lithium-rich manganese-based composite positive electrode material. The prepared lithium-rich manganese-based positive electrode material has excellent electrochemical performance.

The utility model relates to a double-sub-single-layer OLED device with different middle spacing layers. The double-sub-single-layer OLED device comprises an ITO anode, an m-MTDATA hole injection layer, a C545T light-emitting layer, an NPB hole transport layer or an Alq hole transport layer, a DCM2 light-emitting layer, an Alq electron transport layer and an aluminum and lithium fluoride composite cathode which are arranged in sequence. The C545T light-emitting layer and the DCM2 light-emitting layer are both of a sub-single-layer structure. The OLED device overcomes the defect of quenching caused by high doping concentration in the traditional process, also avoids the defect that the doping concentration is low and is difficult to control, has a simple structure, is easy and convenient to manufacture, and can be widely applied to preparation of OLED devices.

This invention provides a composite cathode material for lithium-sulfur batteries, its preparation method, and its application. The preparation method of the composite cathode material for lithium-sulfur batteries provided by this invention includes: firstly, using carbon fiber cloth as a substrate, depositing a nickel source on the surface of the carbon fiber cloth, and then heat-treating the carbon fiber cloth with the deposited nickel source in an inert gas atmosphere to form metallic nickel nanoparticles and create pores within the carbon fiber cloth; after heat treatment, etching with an acid solution to remove the metallic nickel nanoparticles and obtain a porous carbon fiber framework; secondly, in-situ generating a bimetallic sulfide NiCo2S4 on the porous carbon fiber framework; finally, melting and combining the porous carbon fiber framework with the in-situ grown bimetallic sulfide NiCo2S4 with elemental sulfur to obtain the composite cathode material for lithium-sulfur batteries. The composite cathode material provided by this invention can significantly suppress the shuttle effect of the lithium-sulfur battery cathode, improve sulfur loading and reaction kinetics, thereby obtaining a high-performance lithium-sulfur battery.

The present application relates to the field of lithium ion batteries, in particular to a composite cathode material and a preparation method and application thereof.The preparation method provided by the present application comprises the following steps: S1, mixing high-nickel NCA precursors, medium-nickel NCM precursors, lithium sources, bulk doping sources and carbon-coated sources to obtain a precursor mixture; the mass ratio of the high-nickel NCA precursors and the medium-nickel NCM precursors is (6.5:3.5) to (7.5:2.5); the bulk doping source comprises at least one of a cation doping source and an anion doping source; S2, performing multi-stage sintering, annealing and crushing on the precursor mixture to obtain a composite cathode material.The present application successfully prepares a cathode material which is superior to traditional NCA in terms of high capacity, long cycle life, excellent rate performance and excellent thermal safety through the synergistic effect of the core-shell gradient structure design, bulk doping and surface carbon coating, and in combination with a multi-stage sintering process.

A composite cathode material precursor, its preparation method, and its application are disclosed. The composite cathode material precursor comprises an N-doped iron phosphate core and an M-doped iron phosphate coating layer covering the surface of the iron phosphate core. The N element includes at least one selected from Mn, Ni, Co, Cr, V, Mg, Sr, Nb, La, Nd, Ce, and Y, and the M element includes at least one selected from Al, Ti, and Zr. By introducing doping elements N and M into the core and coating layer of the cathode material precursor, respectively, the crystal structure of iron phosphate can be adjusted, improving its conductivity and ion diffusion rate. Furthermore, the doping elements N and M form a synergistic effect in the composite cathode material precursor, comprehensively improving the structural stability, cycle life, ion transport rate, and electrochemical performance of the cathode material by optimizing the crystal nucleus structure, enhancing the stability of the coating layer, and regulating the electronic structure.

The application relates to the technical field of positive electrode materials, in particular to a lithium-rich manganese-based composite positive electrode material, a preparation method thereof and a battery. The preparation method of the lithium-rich manganese-based composite positive electrode material comprises the following steps: mixing a first lithium-rich manganese-based positive electrode material, a second lithium-rich manganese-based positive electrode material, an acid agent and a solvent, and performing an acid pickling treatment; wherein the particle size Dv50 of the first lithium-rich manganese-based positive electrode material is larger than the particle size Dv50 of the second lithium-rich manganese-based positive electrode material; collecting the solid phase after the acid pickling treatment, performing a third sintering treatment, and obtaining a modified composite material; and forming a coating layer on the modified composite material. According to the application, the gradation mixing is arranged in front of the modification treatment, so that the initial efficiency, the discharge capacity, the rate performance and the cycle performance of the battery can be further improved under the condition that the improvement of the compaction density is close to the limit.

The application relates to a kind of composite positive electrode active material and its preparation method, positive electrode, full solid-state battery in lithium battery production technical field.The composite positive electrode active material is core-shell structure, the core material includes ternary positive electrode material or lithium-rich manganese-based positive electrode material, the shell layer includes LiNbO2F.The application can effectively improve the high-voltage stability of the composite positive electrode active material by forming the shell layer of fluoride LiNbO2F on the surface of ternary positive electrode material or lithium-rich manganese-based positive electrode material, and then the cycle performance of the full solid-state battery can be effectively improved.On the other hand, by coating LiNbO2F, the solid-solid contact of the positive electrode and the solid-state electrolyte membrane can be effectively improved, the interface contact of the positive electrode and the solid-state electrolyte membrane is improved, and the polarization of the battery is reduced, the internal resistance of the battery is effectively reduced.

The present application provides a kind of composite positive electrode active material, it is characterized in that, including core layer, contains positive electrode active material;Hydrogen fluoride barrier layer, cover core layer, hydrogen fluoride barrier layer contains by Nb, Ba, Zr, Mn, Mg, Al and Ca in any one or any combination thereof and O, F, B and P in any one or any combination thereof constitute the substance;And physical barrier layer, cover hydrogen fluoride barrier layer.By the composite positive electrode active material of the present application, preparation method, positive plate and lithium ion secondary battery, effectively prevent the contact and reaction of hydrogen fluoride and positive electrode active material, inhibit the dissolution of metal in positive electrode active material, ensure the stability of crystal structure in positive electrode active material body phase, and realize the increase of cycle retention rate and the reduction of impedance growth rate.

A composite cathode particle based on a ternary oxide for an electrochemical battery, wherein the electrochemical battery is a solid-state battery or semi-solid battery. The composite cathode particle includes a large NCM (lithium nickel manganese cobalt oxide) particle. An outer surface of the large NCM particle is partially or fully enclosed by a glass phase layer. A plurality of small LLZO particles are dispersed within the glass phase layer or on an outer surface of the glass phase layer. The large NCM particle, the glass phase layer and the small LLZO particles form a composite NCM particle. Each of the small LLZO particles is formed by a LLZO (Li7La3Zr2O12) or a LLZO doped with at least one metal. An outer surface of the composite NCM particle is wrapped by a plurality of first carbon nanotubes and filled by a plurality of nanoscale amorphous carbons.

Disclosed are a composite positive electrode active material for a lithium secondary battery including a lithium cobalt-based oxide; a method for manufacturing the same; and a lithium secondary battery including a positive electrode including the composite positive electrode active material, wherein in the composite positive electrode active material for a lithium secondary battery, a particle coating portion is arranged in the form of an island on one surface of a lithium cobalt-based oxide, the particle coating portion includes a first coating layer including a lithium titanium-based oxide, and a surface coating portion is arranged in an inner region of another surface of the lithium cobalt-based oxide.

The invention relates to the field of batteries, in particular to a composite cathode conductive agent and a preparation method and application thereof. The composite cathode conductive agent comprises reduced graphene oxide and a zinc oxide nanosheet layer coated on the surface of the reduced graphene oxide. The composite cathode conductive agent can reduce direct contact between conductive carbon and electrolyte and inhibit side reaction between the conductive carbon and sulfide solid electrolyte. A normal electron transmission path is reserved through a coating defect or an uncovered area.

Provided is a cathode active material for a rechargeable alkali metal battery, wherein the cathode active material comprises a sodium salt composite comprising a mixture or composite of Fe and at least a sodium salt selected from NaxA, wherein x is from 1 to 3, and the anion Ax− is selected from F−, Cl−, Br−, I−1, PO43−, SO42−, CO32−, SiO32−, NO3−, B4O72−, or a combination thereof, wherein a molar ratio of Fe-to-sodium salt is from 1 / 9 to 9 / 1. Also provided is a rechargeable alkali metal battery comprising this cathode active material, which is a sodium battery (sodium-ion or sodium metal battery), a lithium battery (lithium-ion or lithium metal battery), or a potassium battery (potassium-ion or potassium metal battery).

The invention provides a self-cleaning electrochemical descaling cathode material as well as a preparation method and application thereof, and relates to the technical field of preparation of high-performance cathode materials. The cathode material is prepared by sequentially preparing the porous micro-nano nickel array and the polymer layer on the metal substrate, when the cathode material is used for electrochemical descaling, the porous micro-nano nickel array can serve as an OH <-> carrier to generate alkalinity and provide a way for ion diffusion, generation of OH <-> and scaling precipitation reaction of Mg < 2 + > and Ca < 2 + > are separated to different areas of a composite cathode, and the composite cathode material is used for electrochemical descaling. And the smooth surface reduces the adhesion of the scaling, causes spontaneous scaling and shedding, ensures the continuous generation of the precipitate, and reduces the inactivation rate of the cathode and the energy consumption.

A porous composite cathode active material for lithium- of sodium-sulfur batteries is provided. The porous composite cathode active material includes an interconnected framework of metal sulfide particles in a conductive binder. The porous composite cathode active material contains between 50 and 75 mass % of an electroactive chalcogen conversion cathode material and between 10 and 35 mass % metal sulfide(s). Methods of making the material can include forming a slurry and drying under controlled conditions.

This invention relates to the field of sodium-ion battery technology, and discloses a sodium-ion cathode material, its preparation method and application, a sodium-ion battery, a sodium-ion battery pack, and a device. The sodium-ion cathode material includes a matrix and a coating layer covering the matrix; the matrix has the composition shown in Formula I: Na 1‑x [Ni y Mn z M u Ti v O2 Formula I; the coating layer has the composition shown in Formula II: Na 2‑β Ti 6‑α M′ α O 13 Formula II. This sodium-ion cathode material possesses characteristics such as high ionic and electronic conductivity, strong structural stability, and strong chemical stability. Furthermore, using this composite cathode material in sodium-ion batteries can effectively improve the battery's electrochemical performance.

This invention relates to a ferric chloride solid-state battery and its preparation method. The battery utilizes a ferric chloride composite cathode material modified with 2-phosphonobutane-1,2,4-tricarboxylic acid and incorporating lithium vanadium oxide functional additives. This composite cathode, together with a lithium metal anode and a gel polymer electrolyte membrane formed by in-situ polymerization, constitutes an integrated solid-state energy storage system. The composite cathode forms a stable coordination layer on the ferric chloride surface via PBTCA, and competitively anchors chloride ions at strong Lewis acid sites on the LVO particle surface, blocking the formation of polychloride intermediates. These two aspects synergistically inhibit the dissolution of the active material. The gel polymer electrolyte membrane uses a fibrous material as a framework and is formed by in-situ polymerization in a lithium salt-containing DOL solution and a Lewis acid-containing DME solution, creating a three-dimensional cross-linked network. Based on this design, the solid-state battery exhibits good interfacial contact, a lithium-ion transference number of no less than 0.416, and a long cycle life exceeding 990 cycles.

The present invention concerns polymer electrolytes comprising a polymer backbone derived from dialkylacrylamide monomers which effectively encapsulate deep eutectic solvents (DES) and are compatible with high potential electrodes. The present invention further concerns composite cathodes and electrochemical cells comprising the polymer electrolyte, and uses thereof.

The present invention concerns polymer electrolytes comprising a polymer backbone derived from acrylamide monomers and bis-acrylamide crosslinkers which effectively encapsulate deep eutectic solvents (DES) and are compatible with high potential electrodes. The present invention further concerns composite cathodes and electrochemical cells comprising the polymer electrolyte, and uses thereof.

The invention provides a single crystal-polycrystal composite positive electrode material and a preparation method thereof, a solid-state battery positive electrode layer and a solid-state battery, the single crystal-polycrystal composite positive electrode material comprises a single crystal positive electrode material, a polycrystal positive electrode material and a solid electrolyte material, the particle size D50 of the polycrystalline positive electrode material is larger than the particle size D50 of the single crystal positive electrode material and is larger than the particle size D50 of the solid electrolyte material; the mass ratio of the polycrystal positive electrode material to the single crystal positive electrode material is less than or equal to 1. According to the invention, through three-level grain composition and control of the mass ratio of the single-crystal positive electrode material to the polycrystalline positive electrode material, the single-crystal particles construct a rigid framework, and the polycrystalline particles and the electrolyte fill gaps, so that the contact area of the active material and the electrolyte is increased, the stack pressure is reduced, and the compaction density is improved; and meanwhile, the problems of poor interface stability, poor rate capability and high cost are solved.