3303results about "Cell electrodes" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

To provide a fuel cell that can be constructed thinly while ensuring sufficient thickness of the gas diffusion layer. [Solution] A fuel cell cell that generates electricity by the reaction of a reaction gas comprises a membrane electrode assembly having an electrolyte membrane and a catalyst layer, a gas diffusion layer laminated on the membrane electrode assembly and made of a porous metal, and a separator laminated on the gas diffusion layer and parallel to the plane direction of the membrane electrode assembly, wherein the gas diffusion layer has grooves through which the reaction gas flows on the separator side.

The application provides a preparation method of a precursor pre-adsorption sodium-supplemented sodium iron phosphate pyrophosphate positive electrode material, uses hydrated iron phosphate as a precursor, and places the precursor in a sodium salt of an organic weak acid sodium supplement solution for impregnation adsorption, and after drying, is mixed with a sodium source, a phosphoric acid source, a pyrophosphoric acid source and a carbon source, and is sintered in an inert atmosphere to obtain a pre-sodium-supplemented Na4Fe3(PO4)2P2O7 / C material. The application also provides a sodium iron phosphate pyrophosphate positive electrode material prepared by using the above method, and a sodium ion battery comprising the material. By impregnating and adsorbing the sodium salt of the organic weak acid sodium supplement on the industrial precursor of the sodium iron phosphate pyrophosphate, the nanoscale dispersion of the sodium supplement is achieved, the toxicity and high gas production of the traditional sodium supplement are avoided from the root, the process is adapted to the existing industrial production line, the first coulomb efficiency and the cycle stability of the sodium iron phosphate pyrophosphate positive electrode material are effectively improved, and the industrial application is promoted.

A positive electrode active material and a method for manufacturing the same, a positive electrode sheet, a battery, and a power-using device, wherein the chemical formula of the positive electrode active material is Na x M (1-y) Ca y The material is O2, M contains a transition metal element, x = 0.8 to 1.1, 0.005 ≤ y ≤ 0.015, and 95 wt% or more of Ca elements are distributed within the surface layer of the single crystal particles of the positive electrode active material, with a surface layer thickness of 1 μm. The residual alkali content of the positive electrode active material is low, improving the stability of the positive electrode active material in air, and as a result, the cycle performance when applied to batteries is improved.

The application discloses a synthesis method of a large single-crystal sodium-ion battery layered oxide positive electrode material, and comprises the following steps: (1) weighing metal oxides containing transition metal elements, transferring to a device with mixing functions, uniformly mixing, and obtaining a metal oxide mixture; (2) adding acid to the metal oxide mixture, fully mixing, and completing an acid treatment process; (3) adding alkali to the mixture after acid treatment, fully mixing; (4) transferring the mixture obtained in the step (3) to a calcining furnace, high-temperature calcining, and obtaining a layered oxide. The acid treatment process is introduced, the surface of the metal oxide forms a defect structure under the action of the acid, and the defect structure is more beneficial to the formation of strong interaction between each component of the metal oxide and between the metal oxide and sodium-containing alkali, so that a larger single-crystal layered oxide structure is finally formed, and the specific capacity, rate performance and cycle performance are excellent.

An embodiment of the present invention provides a secondary battery that comprises a positive electrode active material composite including a positive electrode active material containing an oxide containing Li and Co, and two or more coating layers at least partially covering the positive electrode active material, wherein the two or more coating layers include a first coating layer and a second coating layer from the positive electrode active material toward the outside, one of the first coating layer and the second coating layer contains the element Al, and the other of the first coating layer and the second coating layer contains at least one element selected from the group consisting of F, Mg, Mn, and Ti.

Provided are: lithium-excess positive electrode active material particles having a stabilized crystal structure; and a secondary battery including the particles. These positive electrode active material particles comprise lithium, a transition metal M (M is one or more selected from Mn, Cr, Mo, Nb, V, Fe, Ni, Ti, and Ru), oxygen, magnesium, and fluorine, wherein: Li / M (atomic ratio) in the positive electrode active material particles is more than 1; the positive electrode active material particles each have a core, a barrier film outside the core, and a shell outside the barrier film; more magnesium and fluorine are detected in the shell than in the core; crystalline orientations of the core and the shell substantially coincide with each other; and the shell has a fluoride.

The present invention pertains to lithium-nickel-manganese composite oxide particles are for use in a positive electrode active material for a lithium-ion secondary battery, and the lithium-nickel-manganese composite oxide particles include secondary particles formed by the aggregation of primary particles containing a lithium-nickel-manganese composite oxide having a hexagonal crystal structure with a layered structure. The secondary particles each have a hollow structure including an outer shell portion and a hollow portion formed inside the outer shell portion. The lithium-nickel-manganese composite oxide particles include, as 20% or more of the total number of the secondary particles, through‑hole-containing secondary particles that each have a through‑hole which has an average diameter of 20 nm or more and penetrates the outer shell portion from the outside of the outer shell portion to the hollow portion.

The application discloses a kind of high-efficiency dispersed carbon nanomaterial slurry and preparation method thereof, belong to battery material technical field.The application is by one-dimensional carbon material and three-dimensional carbon material are compounded, and three-dimensional conductive network structure is constructed.Active material particles as "point", one-dimensional carbon material as "line", three-dimensional carbon material as "face", and the three are interwoven and lapped, and form continuous intercommunication conductive path.The preparation method of the application effectively solves the problem that carbon nanomaterial is easy to agglomerate by optimizing dispersion process and composite strategy, significantly improves the dispersion stability of slurry and the conductive performance of electrode, effectively improves the energy density, cycle life and safety of battery.The carbon nanomaterial slurry of the application can be widely used in lithium ion battery, sodium ion battery and other secondary battery fields, and has good industrial application prospect.

The application relates to the field of battery materials, in particular to a composite micro-nano silicon-carbon negative electrode material and a preparation method and application thereof. The negative electrode material comprises an external nano-flexible coating layer and internal honeycomb-comb composite micro-nano silicon; the nano-flexible coating layer is covalently grafted carbon fiber@graphene flexible monolayer carbon, and the honeycomb-comb composite micro-nano silicon comprises honeycomb-shaped microporous silicon as a skeleton and nano silicon particles as combs and loaded in the microporous silicon skeleton channel. In the application, the honeycomb-comb composite micro-nano silicon can significantly improve the volume energy density, slightly reduce the volume expansion of silicon, the addition of the flexible coating layer with a nano skeleton can significantly reduce the volume expansion rate and interface stability of silicon, greatly improve the cycle life and rate performance, and the application has high initial coulomb efficiency and high safety performance.

Battery cell characterized in that it comprises a stacked electrical core, wherein the stacked electrical core comprises a cathode foil and an anode foil, wherein the cathode foil comprises a cathode collector and a cathode film layer provided on at least one side of the cathode collector, wherein the cathode film layer comprises lithium-containing transition metal phosphate particles provided with a carbon material on at least part of a surface; wherein a median C50 of the degree of graphitization in the cumulative distribution curve for the graphitization C value of the cathode film layer, obtained in the area-scanning mode of the laser microconfocal Raman spectrometer, is 0.95–1.20; wherein the graphitization C value is IG / ID, where IG is the intensity of the G-peak of the Raman spectrum at 1580 ± 100 cm⁻¹ and IG is the intensity of the D-peak. of the Raman spectrum at 1350±100cm-1;where the density of the cathode foil when the battery cell is in a fully discharged state is 2.3 g / cm3-2.6 g / cm3;

The application discloses a catalytic-assisted graphitization method of a graphite material for a lithium battery negative electrode and belongs to the technical field of lithium ion batteries. Spherical mesophase carbon microspheres, iron nitrate nonahydrate and ammonium molybdate liquid are mixed and then spray-dried to obtain composite microsphere powder of an iron-molybdenum catalyst precursor; the powder is heated and mixed with medium-temperature coal pitch and then cold isostatic pressed to form a composite green compact; after gradient carbonization treatment, an isotropic stress field is established in the compact by pitch carbonization shrinkage; high-temperature catalytic graphitization is carried out at 2600 DEG C to 2800 DEG C, so that the iron-molybdenum forms a eutectic catalytic system, cooperates with the stress field to induce carbon atom rearrangement, and forms a high-crystallinity graphite structure with high surface graphitization degree and isotropic interweaving in the interior; and finally, the high-crystallinity graphite structure is dissociated, crushed and graded. Through the synergistic effect of catalysis and the stress field, the application realizes the unity of high capacity and high rate performance of the negative electrode material.

The present disclosure provides an electrode mixture that, after having been used to form an electrode active material layer, can inhibit excessive collapse of the electrode active material in the thickness direction when pressed, and / or that can improve homogeneity of the constituent components in the thickness direction and the in-plane direction, as well as a battery comprising the electrode mixture. The electrode mixture of the disclosure comprises electrode active material particles and tetrapod-shaped particles. The battery of the disclosure has an electrode active material layer, the electrode active material layer comprising an electrode mixture of the disclosure.

The utility model relates to a kind of LED candle lamp based on metal fuel cell, it is characterized by: including LED electronic movement, electric core fixed shell piece, electric core module and cathode module;In the utility model, cathode metal is installed from top to bottom, and cathode metal is placed at the top cover of electric core module by cathode fixing piece directly;The installation mode of this cathode metal is convenient to replace;And by using metal fuel cell applied on LED candle lamp, it can replace existing dry battery, lithium battery, increase the use time of product, and have the advantages of environmental protection and no pollution.

The application relates to a MOFs derived iron / nitrogen doped porous carbon nanofiber and a preparation method and application thereof. The preparation method is as follows: polyacrylonitrile and 2-methyl imidazole are subjected to electrostatic spinning and pre-oxidation treatment to obtain a pre-oxidized nanofiber film; the pre-oxidized nanofiber film is placed in a mixed solution of zinc nitrate, iron chloride and 2-methyl imidazole to perform a solvothermal reaction, thereby obtaining a nanofiber film coated with irregular ZnFe-ZIF; and high-temperature annealing is performed to obtain an iron / nitrogen doped porous carbon nanofiber film material. The film material preparation method is simple, the process flow is short, the cost is low, and the structure is uniform. Benefited from the high-conductivity carbon nanofiber film, the rich Fe-N active species and the porous structure, the nanofiber provided by the application exhibits excellent oxygen reduction (ORR) and oxygen evolution (OER) catalytic performance and zinc-air battery performance, and has a good application prospect in the field of energy conversion and storage.

The application discloses a modified sulfur positive electrode material for a metal-sulfur battery, a preparation method of the modified sulfur positive electrode material and the metal-sulfur battery. The modified sulfur positive electrode material comprises an S / C composite material and an HNBR layer uniformly coated on the surface of the S / C composite material. The preparation method of the modified sulfur positive electrode material comprises the following steps: (1) obtaining an S / C composite material; (2) uniformly dispersing S / C composite material powder in 3-20 wt% HNBR glue solution, treating the obtained mixture at 30-80 DEG C for 5-60 minutes, then heating and treating the mixture at 170-200 DEG C for 20-60 minutes, and finally separating and drying to obtain the modified sulfur positive electrode material. The application provides a metal-sulfur battery, wherein the positive electrode comprises the modified sulfur positive electrode material. Compared with unmodified S / C material, the modified sulfur positive electrode material provided by the application improves the specific capacity and cycle stability of the metal-sulfur battery.

This application discloses a cathode material and its preparation method, a cathode, a sodium battery, and an electrical device. The cathode material includes a material with the chemical formula Na... q Ni x Mn y Fe z Zn p M i O j The layered oxide shown has the following properties: 0.8 ≤ q ≤ 1, 0.1 ≤ x ≤ 0.3, 0.2 ≤ y ≤ 0.5, 0.2 ≤ z ≤ 0.35, 0.02 ≤ p ≤ 0.075, 0 ≤ i ≤ 0.1; M is a doped metal element. The cathode material preparation method includes adding Na... q Ni x Mn y Fe z Zn p M i O j The precursor undergoes a sintering process. The positive electrode contains the layered oxide shown in the chemical formula, and the sodium battery contains this positive electrode. The electrical device contains this sodium battery. The layered oxide contained in the positive electrode material of this application exhibits high structural stability, high specific capacity, and good cycle stability of reversible capacity. The sodium battery has high energy density and good cycle performance.

This invention discloses a low-temperature graphitization method for carbon materials based on a binary transition metal salt synergistic catalysis and freeze-drying process. This method requires no organic dispersants or anchoring agents. First, a specific Mn-containing transition metal salt solution is mixed with carbon black. Then, a freeze-drying process with precisely controlled temperature and pressure is used to fix the dispersion state of the metal precursor. Next, catalytic graphitization is carried out in an inert atmosphere at a temperature below 1100°C. Finally, the carbon skeleton is purified by acid washing and stabilized by secondary annealing, yielding carbon materials with high graphitization degree (Raman ID / IG value of 0.6–0.91), high specific surface area, and abundant pore structure. This invention overcomes the problems of reliance on organic additives, complex processes, and high energy consumption in traditional technologies by combining the binary metal synergistic effect with a unique physical drying process and secondary annealing process, providing a new approach for the low-cost and green preparation of high-performance fuel cell catalyst supports and other materials.

The application relates to the field of inorganic materials, in particular to a kind of antimony trioxide and its preparation method and application, comprising: preparing PS-b-PVP copolymer template; PS-b-PVP copolymer template is immersed in treatment in antimony salt and ammonia water in turn; pyrolysis under inert gas protection, the antimony trioxide prepared in the application has unique nanotubular structure, effectively shortens the transmission path of lithium ion and electron, significantly inhibits the pulverization and structure collapse of electrode material in the charging and discharging process, thereby endowing it with high specific capacity and excellent cycle stability.

Catalyst-coated ion-conducting membrane comprising an anode catalyst layer, a cathode catalyst layer and an ion-conducting membrane layer arranged between the anode catalyst layer and the cathode catalyst layer, wherein: the anode catalyst layer comprises an anode electrocatalyst and an ion-conducting polymer, wherein the anode electrocatalyst comprises particles of a platinum group metal or a platinum group metal alloy, and the anode electrocatalyst is present in the anode catalyst layer with a load of less than 0.20 mg of the platinum group metal per cm² of the anode catalyst layer;and the cathode catalyst layer comprises an ion-conducting polymer and a cathode electrocatalyst comprising platinum-containing particles and a carbon-based support, wherein the carbon-based support comprises individual primary particles or an aggregate of primary particles, the primary particles comprising pores, with some of the platinum-containing particles located within the pores and some of the platinum-containing particles located on an outer surface of the carbon-based support; wherein the platinum-containing particles on the outer surface of the carbon-based support have a mean average particle size of ≤3.0 nm; and wherein less than 50% of the surface area of ​​the platinum-containing particles is in contact with the ion-conducting polymer of the cathode catalyst layer.

The application relates to the field of battery materials, in particular to a preparation method of a silicon-carbon material. The preparation method of the silicon-carbon material comprises the following steps: a synthesis step of a metal organic framework material; an activation step of the metal organic framework material; and a nano-silicon deposition step: placing the activated metal organic framework material in a silicon-containing gas, using laser to induce dissociation of the silicon-containing gas, so as to deposit nano-silicon on the activated metal organic framework material. Through the preparation method of the silicon-carbon material provided in the application, uniform distribution and controllable growth of silicon nanoparticles in MOF channels can be realized, and the electrochemical performance and cycle stability of the material are significantly improved.

This invention belongs to the field of sodium-ion battery technology, specifically relating to a negative electrode material based on hydroxyl-containing carbohydrates, a negative electrode, a battery, and a preparation method. The negative electrode material based on hydroxyl-containing carbohydrates is obtained by pre-oxidizing hydroxyl-containing carbohydrates at 250℃~350℃ for 3h~4h, grinding, and carbonizing in an inert atmosphere; the hard carbon powder exhibits a three-dimensional network structure containing closed pores. The pre-oxidation cross-linking forms a three-dimensional network structure, creating some closed pores within, thus enabling the material to exhibit high first-cycle coulombic efficiency and ultra-high plateau capacity.

This invention discloses a direct regeneration method for waste lithium iron phosphate cathode materials based on lignin photo-assisted regeneration, as well as the regenerated lithium iron phosphate cathode materials and their applications, belonging to the field of lithium-ion battery technology. The method includes: mixing waste lithium iron phosphate powder, lignin, and a lithium source; adding a solvent and dispersing the mixture to obtain a homogeneous solution; subjecting the homogeneous solution to photothermal synergistic assisted regeneration to obtain a regenerated lithium iron phosphate cathode material slurry; and separating and drying the regenerated lithium iron phosphate cathode material slurry to obtain the regenerated lithium iron phosphate cathode material. This invention innovatively uses lignin derived from biomass waste as a photoresponse and electron transfer participant, achieving simultaneous lithium replenishment and Fe2+ replenishment through a gentle method while ensuring the integrity of the waste lithium iron phosphate cathode material framework. 3+ Price regulation, Fe Li The invention discloses the suppression of antisite defects, removal of impurity phases, and restoration of electrochemical performance. It also discloses the regenerated lithium iron phosphate cathode material prepared by the above method and its applications.

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 application provides a positive electrode sheet, a battery and an electric device. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer, the positive electrode active layer comprises a nickel-cobalt-manganese ternary material and a manganese iron lithium phosphate material; the X-ray crystal diffraction spectrum of the positive electrode sheet comprises a first characteristic peak with a 2θ angle of 18.67±0.5° and a second characteristic peak with a 2θ angle of 35.58±0.5°, the peak intensity of the first characteristic peak is I1, and the peak intensity of the second characteristic peak is I2; wherein, 13≤I1 / I2≤30, and the mass percentage of Mn 2+ Mn 2+ 4+ Mn 4+ in the positive electrode sheet satisfies 22%≤W Mn 2+ Mn 4+ ≤62%. The positive electrode sheet of the application has high energy density, good cycle performance and rate performance, and low material cost when applied in a battery.​​​​

The application discloses a kind of surface chemical reconfiguration's sodium ion battery hard carbon negative electrode material and preparation method thereof.The method comprises the following steps: constructing organic precursor layer on the surface of carbon source matrix;Using acid dehydrating agent to induce the dehydration, crosslinking or aromatization reaction of precursor layer at 0-300 DEG C, to form stable surface solidification layer;Finally, high-temperature carbonization is obtained hard carbon material.The application utilizes acid-assisted solidification technology, significantly reduces the content of active oxygen-containing functional groups on the surface of hard carbon (XPS shows <5.0%), while maintaining the internal microporous sodium storage capacity, significantly improves the interface stability and the first coulomb efficiency of the material (can reach more than 95%).The process is simple, low in cost, and suitable for large-scale industrial production.

Provided is a supported metal catalyst that has an electrical conductivity permissible as a catalyst and that is capable of inhibiting generation of hydrogen peroxide.　The present invention provides a supported metal catalyst comprising: a carrier powder; and fine metal particles that are supported by the carrier powder. The carrier powder is an aggregate of fine carrier particles. The fine carrier particles each have a chain portion that is formed by fusion bonding of a plurality of crystallites into the form of a chain. The fine carrier particles are formed of a metal oxide. The metal oxide includes cerium. The supported metal catalyst has an electrical conductivity of at least 10-4 S / cm.