7 results about "Main group element" patented technology

The application provides a main group element ion doped zero-dimensional metal halide fluorescent sensing material and a preparation method and application thereof, and belongs to the technical field of fluorescent sensing materials. The main group element ion doped zero-dimensional metal halide microcrystal is synthesized by a solvothermal method, the strong dependence of two thermal coupling energy levels of the main group element ion on temperature is utilized, the main group element ion doped zero-dimensional metal halide shows an obvious temperature dependence evolution trend of fluorescence lifetime and fluorescence intensity at low temperature, and dual-mode (fluorescence intensity ratio / fluorescence lifetime) high-sensitivity temperature detection in a liquid helium temperature region can be realized. The synthesis method is simple in process and easy to control in synthesis conditions, the obtained material shows extremely high relative sensitivity in the liquid helium temperature region, has high practical application value, can be used as a novel optical temperature sensing material, and can be used for temperature detection in various extreme temperature regions.

This invention discloses a sulfide solid electrolyte comprising a substrate and co-doped elements, including M and N, where M≠N and M and N are transition metals or main group elements with different valence states. M is used to replace cation sites in the substrate, and N is used to replace anion sites in the substrate. M and N have a co-doping combination relationship, replacing either cation or anion sites. Based on this, the invention also discloses a method for preparing the above material. The invention has the following technical advantages: the material bulk effectively prevents the initiation and penetration of Na dendrites. The heterovalent co-doping strategy is precisely designed to ensure that while enhancing mechanical stiffness, the ion transport mechanism is not impaired, maintaining a high level of superionic conductivity. This avoids the use of complex and expensive external composite materials or multilayer interface coatings to enhance mechanical properties in ASSSIBs, simplifying the manufacturing process and reducing manufacturing costs.

A catalytic system comprising a vessel configured with a controllable heating environment; and a catalyst composition disposed in the vessel, the catalyst composition comprising at least one transition metal atomically dispersed in a matrix of at least one main group element, wherein the catalyst composition is an amorphous solid configured to promote carbon-hydrogen bond activation and carbon-carbon bond transformation of an organic material under thermal conditions, and wherein the catalytic system is operated in an inert atmosphere.

A manufacturing method of a lithium ion secondary battery is provided. A positive electrode active material having a layered rock salt type crystal structure, such as lithium cobaltate, is provided with two regions on the surface thereof, wherein the inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of a main group element such as magnesium oxide. Each of the two regions has a rock salt type crystal structure. The layered rock salt type crystal structure of the inner region and the two regions of the surface layer portion are topologically derived, whereby changes in the crystal structure of the positive electrode active material due to charging and discharging can be effectively suppressed. Furthermore, because the outer coating layer in contact with the electrolyte uses a compound of a main group element that is chemically stable, a secondary battery with superior cycle characteristics can be provided.

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to an A-site silicon-containing MAX-phase layered material and a preparation method and application thereof, the molecular formula of the MAX-phase layered material is Mn + 1AXn, M is one or more of IIIB, IVB, VB or VIB group elements; a is a silicon element or an alloy formed by silicon and other main group elements or subgroup elements in any proportion; x is one or more of carbon, nitrogen and boron; n is 1, 2, 3 or 4; the preparation method comprises a gas phase reaction method or a solid phase reaction method, for example, taking an MAX phase precursor and a silicon-containing substance as raw materials, reacting at a specific temperature and atmosphere, and washing and drying to obtain a target product. The method is easy and convenient to operate and wide in applicability, and controllable preparation of the A-site silicon-containing MAX phase with the M site being a non-titanium element is achieved for the first time. According to the invention, the material system of the Si-MAX phase is obviously expanded, and the problems that the original Si-MAX phase is limited in variety and the M-site element type is limited are solved.

The application relates to the technical field of solid electrolytes, in particular to a co-doped sodium-based sulfide solid electrolyte and a preparation method and application thereof, wherein a Na2S-NaD nanoeutectic precursor is prepared by pre-high-energy ball milling of a sodium source and sodium halide, then the precursor is mixed with the remaining raw materials and sintered at a low temperature of 300-450 DEG C, so that the product forms a nanocrystal-glass composite structure which cannot be obtained by a traditional high-temperature solid-phase method. The unique structure can eliminate the inherent grain boundary impedance of the crystalline material, provide isotropic and continuous three-dimensional transmission channels for sodium ions, significantly reduce the diffusion barrier, and realize ultra-high ionic conductivity far exceeding that of the same-component crystalline material. Meanwhile, the application realizes multi-element synergistic doping by adopting the main group elements M of IV / V to partially replace the position of phosphorus elements and co-substitute the cations with fixed tungsten element doping, so that the lattice can be stabilized, stress can be released, the sodium ion diffusion barrier can be reduced, and the synergistic improvement of high air stability, high structural stability and high ionic conductivity can be realized.

This carbon dioxide gas absorbing material contains a composite metal oxide which is represented by formula (1) NaATiBMCOD (wherein 5 ≤ A ≤ 11, 4 ≤ B ≤ 6, 0 ≤ C ≤ 2, 10.5 ≤ D ≤ 17.5, and M is selected from among transition elements and typical elements), and / or this carbon dioxide gas absorbing material contains a composite metal oxide which contains sodium and titanium. The composite metal oxide shows peaks at diffraction angles 2θ of 12.0° ± 0.5° and 12.6° ± 0.5°, respectively, and also shows one or two peaks in the range from 39.1° ± 0.5° to 41.0° ± 0.5° in a powder X-ray diffraction pattern obtained using CuKα rays.