15results about How to "Stable lattice structure" patented technology

The invention relates to a high-stability electrode for electrochemical lithium extraction and a preparation method thereof, belongs to the technical field of lithium resource extraction, and is used for solving at least one of the problems of poor cycling stability, low current density, low current efficiency and the like of an electrode prepared by an existing method. According to the electrode, the surface of the active material is coated with the solid electrolyte, the coating layer can effectively avoid direct contact between brine and the active material, side reaction is prevented, and therefore the cycle stability of the electrode is improved. The solid electrolyte layer has the effect of transmitting lithium ions, so that foreign ions can be intercepted, and the selectivity of the electrode to the lithium ions is improved. The active material is also coated with an organic conductive polymer, the electronic conductivity of the active material can be effectively improved by the organic conductive polymer layer, the charge transfer impedance of the active material is reduced, and high-current-density lithium extraction is realized.

The invention belongs to the technical field of battery materials, and particularly relates to a sodium ion battery positive electrode material and a preparation method and application thereof. The preparation method of the sodium ion battery positive electrode material provided by the invention comprises the following steps: 1) mixing a sodium source, a precursor and a hexavalent tellurium source, and carrying out first calcination to obtain a first calcined material; and 2) mixing the first calcined material obtained in the step 1), a metal selenium compound and an organic solvent, and performing second calcination to obtain the sodium-ion battery positive electrode material. The structure and interface stability of the material are effectively enhanced through a three-in-one modification strategy of doping the high-valence element Te6 + coating the metal selenium compound and adjusting the microstructure, and the obtained sodium ion battery positive electrode material is stable in structure, stable in interface and good in redox reversibility and has good rate capability and cycle performance.

The invention discloses a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery, and the method comprises the following steps: mixing and dissolving a manganese source, a cobalt source and a lithium source to obtain a metal salt solution; adding organophosphorus sulfide, a complexing agent and a dispersing agent, and reacting to obtain a precursor solution; adding a lithium hydroxide solution, and aging after precipitation reaction; carrying out heat treatment, washing and drying on the aged precipitate; and mixing the dried precipitate with a lithium source, and carrying out segmented sintering to obtain the lithium-rich manganese-based positive electrode material. According to the lithium-rich manganese-based positive electrode material, the preparation method thereof and the lithium ion battery provided by the invention, cobalt and lithium form a nano-scale dynamic interface in the material, so that migration of cobalt and lithium ions can be adjusted in different electrochemical states, and a passivation phenomenon after doping in the prior art is avoided; and phosphorus-sulfur groups are introduced into a material system, so that the lattice structure of the material can be effectively stabilized, and the conductivity of the material is improved by improving the electron and ion transmission efficiency.

The invention discloses a modified cobaltosic oxide precursor material and a preparation method and application thereof, and relates to the technical field of lithium ion batteries, the modified cobaltosic oxide precursor material comprises a cobaltosic oxide matrix, and a nickel element and a manganese element doped in the cobaltosic oxide matrix; wherein in metal elements of the modified cobaltosic oxide precursor material, the molar ratio of a nickel element is 5%-20%, the molar ratio of a manganese element is 1%-3%, the molar ratio of an aluminum element is 0.8%-3%, the D50 particle size of the modified cobaltosic oxide precursor material is 15-20 microns, the specific surface area of the modified cobaltosic oxide precursor material is 3-5 m < 2 > / g, and the particle size distribution width SPAN value of the modified cobaltosic oxide precursor material is 0.2-0.4. The precursor has the advantages of uniform particle size, no cracking on the particle surface and the like, and the lithium cobalt oxide positive electrode material prepared from the precursor material has excellent cycle stability and cycle life.

The invention relates to an alkaline earth metal ion doped titanium-based phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The chemical formula of the alkaline earth metal ion doped titanium-based phosphate composite material is KxMyTiOPO4 / C, M is selected from one or more of beryllium, magnesium, calcium, strontium and barium, x is larger than or equal to 0.8 and smaller than or equal to 0.95, y is larger than or equal to 0.001 and smaller than or equal to 0.1, and the values of x and y meet the charge balance of the chemical formula. By doping alkaline earth metal ions, the lattice structure is effectively stabilized, and the exchange of K-Na ions is avoided, so that the cycling stability of the battery is remarkably improved, and the service life of the battery is remarkably prolonged.

This invention provides a silicon-based anode composite material, its preparation method, and its application. The silicon-based anode composite material comprises a silicon-based core, a boronoxy lattice stabilizer, and an inert material. At least a portion of the boronoxy lattice stabilizer is embedded in the lattice structure of the silicon-based core, and the inert material coats the surface of the silicon-based core. This invention helps improve the initial coulombic efficiency and cycle performance of the silicon-based anode composite material.

The invention relates to the technical field of magnetic cores, and particularly discloses a wide-temperature-range low-inductance-change magnetic core and a preparation method thereof. A wide-temperature-range low-inductance-change magnetic core is characterized in that raw materials comprise main components and additives, and the main components comprise, by mass, 64-69% of Fe203, 19-24% of ZnO, 9-12% of NiO and 3-5% of CuO; on the basis of the total mass of the main components, the additive comprises any one or a combination of more of 0.3 to 1.5 percent of Bi203, 0.2 to 1 percent of Al203 and 0.2 to 0.5 percent of SiO2. The magnetic core with the wide temperature range and the low inductance change can be used for inductance application and automobile circuit board manufacturing, high magnetic conductivity can be kept in the temperature range environment of-20 DEG C to 130 DEG C, the inductance change rate is smaller than or equal to 9.6%, and the magnetic core has excellent temperature change resistance stability.

The invention discloses a Cu-Se-based high-entropy thermoelectric material capable of inhibiting Cu ion migration and a preparation method of the Cu-Se-based high-entropy thermoelectric material, and belongs to the technical field of high-entropy thermoelectric materials. The general formula of the Cu-Se-based high-entropy thermoelectric material is Cux (Pb < 1-y > M < y >) (InzSn < 1-z >) SemTn, x is equal to 1.2-1.8, y is equal to 0.2-0.8, z is equal to 0.1-0.3, m is equal to 0.4-0.9, n is equal to 0.1-0.15, and x, y, z, m and n are molar molecule numbers. The Cu-Se-based high-entropy thermoelectric material can form a more stable lattice structure by accurately controlling the molar ratio and particle size distribution of the elements, so that migration of Cu ions under high current or temperature gradient is inhibited, and the structural integrity and long-term stability of the material can be maintained.

The invention relates to a ferroelectric device and a preparation method thereof. According to the preparation method of the ferroelectric device, the ferroelectric device comprises a ferroelectric layer, the ferroelectric layer is deposited by adopting a metal organic chemical vapor deposition process, the material of the ferroelectric layer comprises magnesium zinc oxide, the chemical formula of the magnesium zinc oxide is MgxZn1-xO, the value range of x is 0.1-0.6, the ferroelectric layer has a single lattice structure, and the lattice structure of the ferroelectric layer is a wurtzite structure. According to the technical scheme, phase separation of the ferroelectric layer in the ferroelectric device can be avoided, the growth rate of the ferroelectric layer can be increased, the large-area uniformity is improved, industrialization is facilitated, the crystal quality can be improved, and the defect density can be reduced.

The invention relates to a preparation method of a positive electrode active material, the positive electrode active material, a positive plate and a battery in the technical field of lithium battery production, the method comprises the following steps: S1, uniformly mixing a manganese-containing precursor, a lithium source, a W source, an Nb source and a metal source M to obtain a mixture; and S2, roasting the mixture to obtain the positive electrode active material. According to the method, doping and coating can be combined through one-step calcination, the process is simple, the cost is low, and the method is suitable for industrial production; the doping of metal elements can stabilize the lattice structure of lithium manganate, and prevents lattice distortion and structural collapse of lithium manganate in the charging and discharging process; in the sintering process, W and Nb elements are diffused and uniformly enriched on the surface of the material for surface doping of the material, and LiNbO3 and Li2WO4 coating layers are uniformly formed on the surface of the material, so that residual Li on the surface of the material is effectively eliminated, the capacity of the battery is effectively improved, and the cycle performance of the battery is improved.

The invention belongs to the technical field of all-solid-state sulfide electrolyte materials, and particularly provides a preparation method of a co-fired argyrodite type electrolyte and an all-solid-state lithium metal battery. The preparation method of the co-fired argyrodite type electrolyte comprises the following steps: step 1, mixing an argyrodite type electrolyte raw material and a fluxing agent; the argyrodite type electrolyte raw materials are selected from any two of Li < 6 > PS5Cl, Li < 6 > PS5Br, Li < 6 > PS5I and Li < 6 > PS5F < 0.7 > Cl < 0.3 >; the fluxing agent is selected from at least one of lithium chloride, lithium bromide, lithium iodide, lithium phosphate, silicon oxide and sodium borate; and step 2, sintering the substance mixed in the step 1 to obtain the co-fired argyrodite type electrolyte. The co-fired argyrodite type electrolyte is good in compatibility with lithium metal, lithium dendrites can be effectively inhibited, and a high-performance all-solid-state lithium metal battery is realized.

The invention belongs to the field of ceramic materials, and particularly relates to potassium tantalate niobate ceramic and a preparation method thereof. The potassium tantalate niobate ceramic comprises the following components in parts by mass: a chemical formula of K1 + Z-YRuYTa (1-x) NbxO3, wherein X is greater than or equal to 0.38 and less than or equal to 0.42, Z is greater than or equal to 0.10 and less than or equal to 0.20, and Y is greater than or equal to 0.35 and less than or equal to 0.50. According to the ceramic and the preparation method thereof, the Ru element is introduced as a doping ion for the first time, comprehensive improvement of the potassium tantalate niobate ceramic in the aspects of insulativity, stability, manufacturability and environmental protection is achieved through the systematic design of element doping innovation, component parameter optimization and technological method cooperation, and remarkable technical progress and industrial application potential are achieved.

The present invention relates to the field of battery technology, and in particular to a high-nickel positive electrode material co-doped with rare earth metal, alkaline earth metal and halogen element and a preparation method thereof. The molecular formula of the high-nickel positive electrode material is Li(Ni x Co y Mn 1‑x‑y ) 1‑a‑2 / 3b‑1 / 3c P a Q b O 2‑c L c ; wherein P is a rare earth metal, Q is an alkaline earth metal, and L is a halogen element; wherein x≥0.6, 0.01≤a≤0.02, 0.01≤b≤0.02, and 0.01≤c≤0.02. The preparation method comprises: weighing a lithium source, a high-nickel precursor, a rare earth metal salt, an alkaline earth metal salt, and a halogen element salt according to the molar ratio of each substance in the molecular formula; mixing them evenly, and treating them by a high-temperature solid phase method to obtain a high-nickel positive electrode material co-doped with a rare earth metal, an alkaline earth metal, and a halogen element. The high-nickel positive electrode material provided by the present invention improves ionic conductivity and electronic stability.

The invention belongs to the technical field of electrode materials, and particularly discloses a Sb-NCM positive electrode material and a preparation method thereof. The chemical formula of the Sb-NCM positive electrode material is Li [NixMnyCozSbt] O2, x is larger than or equal to 0.8, y is smaller than or equal to 0.1, z is smaller than or equal to 0.1, t is smaller than or equal to 0.1, and y + z + t is smaller than or equal to 0.2. The preparation method comprises the following steps: dissolving a nickel salt, a manganese salt and a cobalt salt to obtain a mixed solution, mixing the mixed solution with an alkaline solution, and reacting to obtain a hydroxide precipitate; carrying out preliminary calcination on the hydroxide precipitate to obtain an intermediate product; and finally, mixing the intermediate product with a lithium source and an antimony source, and calcining again to obtain the Sb-NCM positive electrode material. According to the invention, the problem of structure instability of the traditional high-nickel layered oxide under the conditions of high-voltage circulation and rapid charging and discharging is avoided, and the stability, the specific capacity, the overcharge specific capacity retention ratio and the like of the positive electrode material are improved.

This application discloses a palladium-hydrogen rare earth nanoalloy material, its preparation method, and its application. The palladium-hydrogen rare earth nanoalloy material includes a carbon support and PdREH nanomaterials loaded on the surface of the carbon support. x Nanoparticles, PdREH x The nanoparticles comprise an alloy of Pd and rare earth elements (RE), and hydrogen embedded in the alloy lattice; wherein the rare earth element RE is one of Y, Ce, Sm, Gd, and Tb. This application constructs a nanoalloy material with a stable lattice structure and good hydrogen intercalation capability by forming an alloy of palladium and rare earth elements and further intercalating hydrogen. Simultaneously, by combining a carbon support with a two-step Joule thermal-hydrothermal preparation process, the composition and structure of the material can be controllably adjusted. This material exhibits excellent electrochemical response sensitivity, high ethylamine production capacity, and high Faradaic efficiency in the acidic electrocatalytic hydrogenation of acetonitrile to ethylamine reaction, making it suitable for low-resistance proton exchange membrane devices.