185 results about "Lanthanum Ion" patented technology

The invention provides a lanthanum and magnesium doped high-nickel ternary lithium battery positive electrode material and a preparation method. A nickel source, a cobalt source and a manganese sourceare mixed with a lanthanum source and a magnesium source uniformly, then a precipitating agent and a chelating agent are added so as to prepare an NCM precursor paste, and the lanthanum doped high-nickel ternary cathode material Li<1.05-x>Mg<x>Ni<1-2y-z>Co<y>Mn<y>La<z>O<2> is synthesized through pre-sintering and sintering, wherein x is greater than 0 and is less than 0.05, y is greater than 0 and is less than or equal to 0.1, and z is greater than 0 and is less than or equal to 0.05. Through adoption of the high-nickel ternary lithium battery positive electrode material, the defect of low cycle stability of the traditional high-nickel ternary positive electrode material is overcome; lanthanum replaces cobalt and is doped in the lattice, and magnesium replaces lithium and is doped in thelattice, so that the doped lanthanum ions can effectively shorten the length of an axis c in the lattice and improve the ratio of an axis a to the axis c; the positive electrode material is synthesized and is guided to grow a better laminated structure, so that the material structure is more stable; and the doped magnesium impurity prevents cations from being arranged disorderly, so that the electrochemical performance of the positive electrode material is improved.

The invention relates to an ion thermal growth method for converting fluoride nano crystal near infrared light which includes steps as follows: weighing some solid yttrium nitrate (lanthanum nitrate), ytterbium nitrate, erbium nitrate (thulium nitrate or holmium nitrate) pro rata. Mol ratio of the rare earth ion is that yttrium ion (lanthanum ion) : ytterbium ion : erbium ion (thulium ion, holmium ion) equal to 70-90 : 0 : 0.001-15; adding tetrafluoroborate type ion liquor into the mixing solid, selective adding some NaCl solid according with various basic, then placing the mixing solution into a high pressure reaction kettle with polyfluortetraethylene lining, placing into an oven for heating reacting, finally, washing, centrifugating, drying and obtaining the product. The prepared nano upper converting fluorescence material has small and uniform granule, strong lighting strength, better water-solubility and can satisfy need of biomolecule fluorescence mark material.

The invention discloses an absorbent used in sewage phosphorus removal. A carrier of the absorbent is industrial lithium-silicon powder waste slag with a size no lower than 150 meshes. Lanthanum ions are loaded on the carrier. With the absorbent, the removal rate upon phosphorus in phosphorus-containing sewage and wastewater or natural water body with a total phosphorus concentration of 1mg / L and a pH value of 3-8 is always higher than 86%. The invention also discloses a preparation method of the absorbent. According to the invention, the carrier raw material lithium-silicon powder adopted by the absorbent is selected from industrial waste slag, such that the source is wide, and cost is low. With a developed pore structure, the carrier can provide sufficient active absorption points. Only trace of rare earth lanthanum used for modification is needed to be added. The obtained absorbent has excellent phosphorus absorption effects in natural water bodies, sewage and wastewater. With the absorbent, an absorption capacity is high, absorbent stability in water body is high, no water body secondary pollution is caused, and cost is low. The absorbent has a good application prospect.

The invention discloses a lithium ion-type supercapacitor ternary composite negative electrode material and a preparation method thereof. The composite material is formed by strontium-doped lanthanum manganate, lithium titanate and a carbon nano-tube, wherein the mass ratio of the strontium-doped lanthanum manganate to the lithium titanate to the carbon nano-tube is 10:80:10 to 5:90:5. The composite material preparation method comprises steps: a sol-gel method is firstly adopted to coat the surface of the carbon nano-tube with a layer of titanium dioxide, lithium salt is then introduced via a dipping method, and a lithium titanate / carbon nano-tube composite material is thus generated; and a sol containing lanthanum ions, strontium ions and manganese ions is used for dipping, a perovskite-type strontium-doped lanthanum manganate thin film is formed on the surface of the lithium titanate coating surface through high-temperature treatment, and thus a strontium-doped lanthanum manganate / lithium titanate / carbon nano-tube composite material is obtained. The prepared ternary composite material of the invention has high conductive performance and can be used to serve as the negative electrode material for the lithium ion-type supercapacitor, and the specific capacity can reach 153mAh / g at the rate of 10C.

The invention discloses neodymium niobate ceramic having improved microwave dielectric characteristic by substituting neodymium ions with lanthanum ions. The formula of the neodymium niobate ceramic is (Nd1-xLax)NbO4, in the formula, x is less than or equal to 0.1. The preparation method of the neodymium niobate ceramic comprises the following steps: firstly, preparing Nd2O3, La2O3 and Nb2O5 according to the chemical formula, ball-milling, drying, screening, and calcining for 4 hours at 900-1000 DEG C; pelleting, pressing to form a blank, and sintering at 1225-1300 DEG C, thereby obtaining the neodymium niobate ceramic. As lanthanum ions are adopted to substitute Nd on the A site in NdNbO4, the microwave dielectric property can be improved, the dielectric constant of the neodymium niobate ceramic is 21.52, the quality factor of the neodymium niobate ceramic is 45600GHz, and the resonance frequency temperature coefficient of the neodymium niobate ceramic is up to 0ppm / DEG C. The neodymium niobate ceramic is simple in preparation process, environment-friendly in process and is a microwave medium material with a good application prospect.