8529results about "Electrode thermal treatment" patented technology

The present invention relates to a solid composite cathode material comprising a ceramic oxide electrolyte material and a lithium electrode material. It was found that the addition of lithium halide to the selected electrolyte and cathode materials strongly enhances the electrochemical performance.

The present invention relates to an electrode drying apparatus and an electrode drying method, and the electrode drying apparatus includes: an oven configured to provide a space in which the electrode is dried and to include a hot air nozzle or an infrared heater; a color coordinate measuring unit configured to be positioned at an outlet of the oven and measure a color coordinate value of an electrode active material layer with respect to the dried electrode; and a controller configured to analyze a drying result of the electrode from the color coordinate value, determine whether the electrode is defective in drying, and control a drying condition of the electrode.

The invention provides a negative electrode material, a preparation method thereof and a battery. The negative electrode material comprises graphite and a carbon layer located on at least part of the surface of the graphite; the particle surface and the particle tangent plane of the negative electrode material are respectively tested by adopting a Raman spectrum, the ratio of the peak area of a characteristic peak D in the range of 1300 cm <-1 > to 1350 cm <-1 > to the peak area of a characteristic peak G in the range of 1500 cm <-1 > to 1580 cm <-1 > is ID / IG, the ID / IG ratio of the particle surface of the negative electrode material is A, the ID / IG ratio of the particle tangent plane of the negative electrode material is B, and 1.22 < A-B < = 2.10. The particle surface of the negative electrode material is tested through an atomic force microscope, a # imgabs0 # test area is randomly selected on the particle surface of the negative electrode material, the arithmetic mean value of the absolute value of the height deviation relative to the reference surface in the test area is S nm, and S is larger than or equal to 15 nm and smaller than or equal to 60 nm. The negative electrode material provided by the invention can comprehensively improve lithium ion transmission kinetics, first coulombic efficiency and cycle performance.

The present invention relates to a sodium-ion battery material, and specifically relates to a sodium ferric phosphate pyrophosphate composite material, and a preparation process, evaluation method and process optimization method therefor and the use thereof. The sodium ferric phosphate pyrophosphate composite material has a spinel-type NaFePO4 phase; and in an XRD diffraction pattern obtained by subjecting the sodium ferric phosphate pyrophosphate composite material to XRD diffraction using CuKα radiation, there are a characteristic diffraction peak T of sodium ferric phosphate pyrophosphate and a characteristic diffraction peak O of spinel-type NaFePO4 at 2θ of 33.6±0.2° and 32.8±0.2°, respectively, the peak intensities thereof are respectively IT and IO, and the diffraction peak intensity ratio Ir is equal to IT / IO, wherein 6.19≤Ir≤13.

Batteries, component structures and manufacturing methods, in particular including a glassy embedded battery electrode assembly having a composite material structure composed of interpenetrating material components including a porous electroactive network including a solid electroactive material, and a continuous glassy medium including a Li ion conducting sulfide glass, can achieve enhanced power output, reduced charging time and / or improved cycle life.

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

A composite positive electrode material, a preparation method therefor and the use thereof. The composite positive electrode material comprises an inner core and a carbon coating layer covering at least part of the surface of the inner core and / or embedded in the inner core; the inner core comprises NaFePO4 and a compound represented by formula 1; Na4+xFe3-y(PO4)2+zP2O7 formula 1, where -0.15≤x≤0.8, 0≤y≤0.5, and -0.2≤z≤0.2; the particle size of NaFePO4≤100 nm. When being used for batteries, the composite positive electrode material can improve the capacities and rate capabilities of the batteries.

The invention discloses a lithium iron phosphate positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium iron phosphate positive electrode materials. The lithium iron phosphate positive electrode material comprises a lithium iron phosphate matrix and a carbon coating layer coating the surface of the lithium iron phosphate matrix, the average standard deviation of the thickness of a carbon coating layer in the lithium iron phosphate positive electrode material is # imgabs0 #, and sigma (d) is more than or equal to 0.05 nm and less than or equal to 0.35 nm; the average standard deviation of the carbon content in the lithium iron phosphate positive electrode material is sigma (Cwt%), and sigma (Cwt%) is larger than or equal to 0.02 wt% and smaller than or equal to 0.35 wt%. The lithium iron phosphate positive electrode material has a uniform carbon coating layer, and the thickness of the carbon coating layer and the carbon content at each position are relatively consistent, so that the improvement of the carrier mobility of the lithium iron phosphate positive electrode material is facilitated, and the further improvement of the electrochemical performance of a battery prepared from the lithium iron phosphate positive electrode material is facilitated.

The invention discloses a pre-lithiated silicon-carbon negative electrode material as well as a preparation method and application thereof. The pre-lithiated silicon-carbon negative electrode material comprises composite particles and a surface coating layer coating the outer surfaces of the composite particles, the mass of the composite particles accounts for 85%-99% of the total mass of the pre-lithiated silicon-carbon negative electrode material; the composite particles are compounds of pre-lithiated porous carbon and nano silicon particles; the composite particles are obtained by uniformly depositing nano silicon particles in pores of pre-lithiated porous carbon; the mass of the pre-lithiated porous carbon accounts for 15-95% of the total mass of the composite particles; the pre-lithiated porous carbon comprises lithium metal particles and porous carbon, and the lithium metal particles are attached to the surfaces of pores of the porous carbon; the mass of the lithium metal particles accounts for 0.1-10% of the total mass of the pre-lithiated silicon-carbon negative electrode material; when the pre-lithiated silicon-carbon negative electrode material is applied to the lithium battery, the first-circle coulombic efficiency of the lithium battery can be improved.

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 manganese iron phosphate particles, a first shell layer and a second shell layer, the first shell layer and the second shell layer sequentially coat the surfaces of the lithium manganese iron phosphate particles, the material of the first shell layer comprises nanoscale SiO2 particles, and the material of the second shell layer comprises nanoscale TiO2 particles. The surfaces of the lithium manganese iron phosphate particles are sequentially coated with the SiO2 layer and the TiO2 layer, so that the contact between the lithium manganese iron phosphate particles and an electrolyte can be reduced, the side reaction between the lithium manganese iron phosphate particles and the electrolyte in the electrochemical reaction process is reduced, the cycle life attenuation of the battery is relieved, the dissolution of Mn element is reduced, and the service life of the battery is prolonged. Therefore, the battery impedance increase caused by deposition of Mn < 2 + > on the negative electrode in the circulation process is relieved.

The invention discloses a preparation method and application of a lithium-rich manganese-based positive electrode material of a lithium defect type layered spinel composite phase synthesized by a rapid thermal shock method, and the preparation method comprises the following steps: firstly, preparing a lithium-rich manganese-based precursor by using a coprecipitation method; and mixing the precursor and a lithium salt, and rapidly heating the sample by using Joule heat passing through the powder sample as a heat source to obtain the layered spinel composite phase positive electrode material with lithium defects, and the lithium-rich manganese-based positive electrode material with higher lithium deficiency, a layered spinel composite structure and more excellent performance is generated through ultrafast heating and cooling rate and short-time heat preservation. According to the preparation method disclosed by the invention, the lithium-rich manganese-based positive electrode material with the composite structure, which is relatively large in lithium deficiency, is prepared through a rapid thermal shock technology and has the advantages of high capacity, high first efficiency and long cycle stability; the preparation method is simple, the material cost is greatly reduced, large-scale production can be realized, the production efficiency is improved, and the energy consumption is reduced.

The invention discloses a high-rate lithium ion battery positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: placing a carbon source material, an oxide solid electrolyte, a positive electrode active material and a solvent in stirring equipment, and uniformly stirring and mixing to obtain a mixed solution; placing the mixed solution in drying equipment, and performing drying treatment to obtain a precursor material; and placing the precursor material in sintering equipment, presintering for 2-6 hours at 150-300 DEG C, removing redundant solvent, continuously heating to 400-900 DEG C, preserving heat and sintering for 6-24 hours, and cooling to room temperature to obtain the high-rate lithium ion battery positive electrode material. The lithium ion battery positive electrode material prepared by the invention has a composite coating layer formed by carbon and oxide electrolyte, and when the lithium ion battery positive electrode material is applied to a lithium ion battery, the battery can have good rate capability and cycling stability.

Provided are a lithium manganese iron phosphate material and a preparation method therefor, a positive electrode sheet, and a lithium ion battery. The lithium manganese iron phosphate material comprises a core and a coating layer that coats the surface of the core. The chemical formula of the material of the core is LiaMnbFecMdPO4, wherein M comprises at least one element among magnesium, calcium, strontium, cobalt, titanium, zirconium, molybdenum, vanadium, niobium, nickel, scandium, chromium, copper, zinc, beryllium, lanthanum and aluminum. The coating layer is formed by sintering a carbon source, and the carbon coating layer comprises graphitized carbon.

The invention provides a positive active material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of batteries, the positive active material comprises a ternary material and lithium manganese iron phosphate; wherein the mass of the lithium manganese iron phosphate is A, the total mass of the ternary material and the lithium manganese iron phosphate is B, and A / B is more than 0 and less than 50%; the lithium manganese iron phosphate is of a hollow spherical structure, and the median particle size of the lithium manganese iron phosphate is 0.5-3 microns. According to the positive electrode active material provided by the embodiment of the invention, the cost of the positive electrode active material can be reduced, relatively high rate capability, cycle performance and energy density are considered, and the comprehensive electrochemical performance is improved.

The invention discloses a method for preparing a composite positive electrode material by using a waste battery, and belongs to the technical field of battery recovery. The method comprises the following steps: discharging, disassembling and sorting a waste lithium iron phosphate battery to obtain a positive plate, carrying out water treatment, separating from an aluminum foil to obtain a waste lithium iron phosphate sheet, adding sodium hypochlorite, tetraethoxysilane, deionized water and hydrochloric acid, stirring to obtain SiO2-coated iron phosphate precipitate particles and a lithium-containing solution, adding sodium hydroxide into the lithium-containing solution to adjust the pH value, and carrying out solid-liquid separation to obtain the lithium-ion battery cathode material. Adding sodium carbonate, heating and drying to obtain lithium carbonate precipitate. And adding a carbon source and alcohol into the SiO2-coated iron phosphate precipitate particles and lithium carbonate, carrying out ball milling, taking out, drying, and calcining in a protective atmosphere to obtain the positive electrode composite material. Compared with the prior art, according to the prepared positive electrode composite material, material particles contain a lithium silicate network, so that the specific discharge capacity of a battery material is effectively improved. The method is simple in process and suitable for comprehensive utilization of waste batteries.

An electrode manufacturing system includes a transferring part, a coating part, a drying part, and a heat treatment part. The transferring part is arranged downstream of the drying part to heat the electrode substrate to a high temperature and includes a transfer roller supports and transfers an electrode substrate in a long-sheet shape. The coating part applies an electrode slurry to an electrode current collector. The drying part dries the electrode slurry disposed on the electrode substrate. The heat treatment part is disposed downstream of the drying part along a transfer direction of the electrode substrate and applies heat to the electrode substrate to increase the adhesion of the electrode by changing the crystal phase of the PVdF binder of the electrode substrate during the heat treatment process, thereby preventing the separation of the electrode active material layer. A manufacturing method including the same is also provided.

The invention discloses a preparation method of a nitrogen-phosphorus-sulfur triple-doped hard carbon negative electrode material. The preparation method comprises the following steps: crushing biomass rich in protein, sieving and collecting; the crushed biomass is soaked with a phosphorus source solution, and solid matter is dried after separation; introducing small organic molecule gas into the dried biomass under the protection of inert gas, performing high-temperature pyrolysis to obtain a carbon material, and treating and replacing oxygen-containing functional groups by using nitrogen-containing, phosphorus-containing and sulfur-containing gas; and heating and washing the obtained carbon material by using a strong alkali solution to remove redundant phosphorus source, washing to be neutral, separating, and drying to obtain the nitrogen-phosphorus-sulfur triple-doped hard carbon negative electrode material. The material has an adjustable special hole structure due to cracking and carbonization of small organic molecule gas in pores, affinity of sodium ions and the material is improved due to doping of nitrogen, phosphorus and sulfur, hard carbon interlayer spacing is enlarged due to large atomic radiuses of phosphorus and sulfur, intercalation and deintercalation of the sodium ions are facilitated, sodium modification kinetics is improved, electrode reversibility is improved, and the performance of the electrode is improved. And higher coulombic efficiency is obtained.

The invention discloses a uniform carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium iron phosphate positive electrode materials, the uniform carbon-coated lithium iron phosphate positive electrode material comprises lithium iron phosphate matrix particles, the lithium iron phosphate matrix particles are coated with a composite carbon layer, and the composite carbon layer is doped with cerium modified tantalum carbide nanocrystals; the preparation method of the cerium modified tantalum carbide nanocrystal comprises the following steps: dissolving pentaethoxy tantalum and cerous nitrate in ethylene glycol, adding urea as a precipitator, and synthesizing a Ta-Ce-O precursor through a microwave-assisted solvothermal method; the Ta-Ce-O precursor and phenolic resin are mixed and then subjected to ball milling and sintering, and the cerium modified tantalum carbide nanocrystal is obtained. By introducing a small amount of cerium modified tantalum carbide nanocrystals into the composite carbon layer for many times, uniform coating of the composite carbon layer can be realized, and the electrochemical performance of the lithium iron phosphate positive electrode material is enhanced.

The invention discloses a negative electrode material and a secondary battery. The negative electrode material comprises a silicon-carbon material, the silicon-carbon material comprises a silicon-based material and a carbon-based material, and at least part of the carbon-based material is distributed in the silicon-based material; a Raman spectrum is adopted to test the negative electrode material, the negative electrode material has a first characteristic peak at 515 + / -10 cm <-1 >, and the peak intensity of the first characteristic peak is M1; a second characteristic peak exists at 305 + / -10 cm <-1 >, and the peak intensity of the second characteristic peak is M2; a third characteristic peak exists at 925 + / -10 cm <-1 >, the peak intensity of the third characteristic peak is M3, Q is defined as the oxygen protection degree of the silicon-based material, and Q, M1, M2 and M3 have the following relation: Q = M1 / M2 + M1 / M3, 1.5 < = Q < = 4.5, and M2 > M3. The oxygen protection degree Q value of the silicon-based material of the negative electrode material is controlled to be 1.5-4.5, so that side reaction between the negative electrode material and electrolyte can be reduced, a proper amount of oxide can be formed on the surface of the silicon-based material, and the volume expansion of the silicon-based material is relieved.

A lithium manganese iron phosphate material and a preparation method therefor, a positive electrode sheet and a preparation method therefor, and a battery. The structural formula of the lithium manganese iron phosphate material is LiFexMnyA(1-x-y)PO4, wherein 0<x<1, 0<y<1, 0≤1-x-y≤0.2, and a doping element A is selected from at least one of Be, Ca, Mg, Ba, and Sr. The surface alkalinity value of the lithium manganese iron phosphate material is 10-150 μmol / g.

Apparatus, system and method for simultaneously drying a coating on a substrate using at least two different drying phenomena, for example, inductive heating and convective heating, or inductive heating and a combination of convective heating and infrared heating. A coating on a substrate is dried by generating heat in the substrate while simultaneously applying convective heat and / or radiant heat to the coating. Simultaneous drying refers to drying of the same region of a substrate at the same time, and in a particular embodiment, subjecting the same region of a substrate to inductive heating and convection at the same time. Preferably the substrate is at least partially conductive.

The present invention relates to a positive electrode active material in a single particle form, the positive electrode active material including a lithium composite transition metal oxide in a single particle form, the lithium composite transition metal oxide including Al, Y, and Zr, a method for producing the positive electrode active material, and a positive electrode and a lithium secondary battery including the positive electrode active material.

The invention provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode plate, an electrode and an electric device, and relates to the field of batteries. The silicon-carbon negative electrode material comprises porous carbon and silicon particles attached to the pore walls of the porous carbon, crystalline phases exist in the silicon particles, the crystallinity of the silicon particles is at least 90%, and the average grain size of the silicon particles is smaller than 4 nm. According to the silicon-carbon negative electrode material, the battery can obtain relatively good cycling stability and high initial coulombic efficiency at the same time.

A glassy electroactive prepreg made by generating submicron particles of lithium-ion conducting sulfide glass by providing lithium-ion conducting sulfide glass feedstock material, and subjecting the feedstock material to subzero processing to transform the material into submicron particles can avoid plastic deformation of sulfide glass particles during grinding and produce submicron powders. The prepreg is formed by providing a porous electroactive layer comprising electroactive material, and infiltrating the porous electroactive layer with the submicron particles of lithium-ion conducting sulfide glass. The subzero processing can include cryogenic processing. The prepreg can be used to form glassy embedded electrodes.

The invention belongs to the field of battery materials, and discloses a high-entropy high-nickel positive electrode material which comprises a base material LiNixCoyMzO2, a base further comprises a lithium-site doping element and a nickel-site doping element, the surface of the base is coated with an island-shaped coating layer, and the island-shaped coating layer is a nano metal oxide layer. The preparation method comprises the following steps: uniformly mixing a high-nickel hydroxide precursor, a lithium source, a compound containing an element A and a compound containing an element B, carrying out two-stage sintering, mixing with a metal oxide containing an element C and a metal oxide containing an element D, and sintering to obtain the high-entropy high-nickel positive electrode material. Lithium doping in a bulk phase of the high-entropy high-nickel positive electrode material can improve the electronic conductivity of a single crystal material, increase the interlayer spacing of transition metal and inhibit lithium and nickel positive ions from being mixed, and nickel doping can improve the structural stability and thermal stability of the material, inhibit irreversible phase change of H2-H3 and stabilize lattice oxygen of the material; the doping modification of the two sites further improves the performance of the material.

The present disclosure relates to a sodium ion battery cathode material, and a preparation method and application therefor. The method for preparing a sodium ion battery cathode material of the present disclosure includes the following steps: (A) grinding a mixture of sodium borohydride and ferric manganese hydroxide to obtain first slurry, and performing spray drying and calcination on the first slurry to obtain a first calcinated material; and (B) grinding a mixture of the first calcinated material, a carbon source, a vanadium source, sodium bicarbonate, and water to obtain second slurry, and performing spray drying, calcination, crushing, sieving, and iron removal on the second slurry to obtain a sodium ion battery cathode material. The method is simple in step and low in cost, and the prepared sodium ion battery cathode material has the characteristics of being good in conductivity, high in capacity, high in energy density, etc.

The invention discloses a negative electrode slurry cracking reduction method, which specifically comprises the following steps: S1, negative electrode slurry formula improvement: on the basis of original raw materials of negative electrode slurry: graphite, a conductive agent, a thickening agent, a binder and deionized water, adding a specific additive-N-methyl pyrrolidone accounting for 0.5% of the total weight of the raw materials; the invention relates to the technical field of battery manufacturing. According to the method for reducing the cracking of the negative electrode slurry, coating cracking is remarkably reduced: by adding NMP in a specific proportion, the problem of coating cracking of the negative electrode slurry is effectively improved, and the yield and quality of a negative electrode plate are improved; the cracking-free negative plate can maintain better structure and performance stability, and is beneficial to improving the overall performance and prolonging the service life of the lithium ion battery; the rejection rate and the rework rate caused by cracking are reduced, and the production cost and resource waste are reduced; nMP is used as a common solvent and is widely applied to the battery manufacturing industry.

The invention provides a sodium ferric phosphate pyrophosphate composite material, a preparation method and application thereof, and a sodium ion battery, and relates to the technical field of positive electrode materials, the preparation method comprises the following steps: carrying out solid phase mixing on carbon-coated sodium ferric phosphate pyrophosphate and an organic carbon source, and then carrying out sintering treatment to obtain the sodium ferric phosphate pyrophosphate composite material; the temperature of the sintering treatment is 400-580 DEG C. The technical problems that in the prior art, according to a carbon source coating method, carbon source coating is not uniform, the porosity between materials is difficult to effectively reduce, the compaction performance of the materials cannot be remarkably improved, and the crystal structure of the materials is prone to change are solved, and the purposes of reducing the powder resistance of the materials and improving the compaction performance of the materials are achieved. The carbon coating uniformity is effectively improved, the porosity of the material is effectively reduced, the compaction performance of the material is remarkably improved, the water absorption of the material is reduced, and the crystal structure of the material is improved, so that the technical effect of comprehensively improving the performance of the material is achieved.

The invention relates to the technical field of batteries, in particular to silicon carbon particles, a negative plate and a battery. The invention provides a silicon-carbon particle. The surface of the silicon-carbon particle is provided with a concave part; the number N of the concave parts on the surfaces of the silicon carbon particles is greater than or equal to 1; the diameter of the concave part is 0.05 [mu] m-5 [mu] m; the depth of the recessed part is 10 nm to 5 [mu] m. The sunken parts are arranged on the surfaces of the silicon-carbon particles, so that the cycle stability and the expansion performance of the silicon-based negative electrode material are improved.

Disclosed are high-entropy oxides, and methods of their preparation. The high-entropy oxide is characterised by a sub-micron particle size and rod-like particle shape. The method of its preparation includes a co-precipitation step, preferably using an oxalate compound as a precipitating agent. Also disclosed are an electrode, e.g. an anode, a catalyst and an electrochemical cell comprising the high-entropy oxide.