The present disclosure relates to a positive electrode active material, a method of preparing the same, and a lithium secondary battery having a positive electrode including the same. The positive electrode active material includes: a lithium transition metal oxide particle in which a portion of Li is substituted with Na, and which includes Ni and Co atoms, wherein the lithium transition metal oxide particle includes a concentration gradient region in which the concentration of Co atoms decreases from the surface toward the center of the particle.

The present disclosure discloses a W-containing high-nickel ternary cathode material, including both spherical secondary particles and single-crystal particles. There is basically no W inside the single-crystal particles, and the spherical secondary particles are doped with W. A preparation method of the W-containing high-nickel ternary cathode material includes: mixing a nickel salt, a cobalt salt, and a manganese salt according to a specified molar ratio, and adding an ammonia solution and a sodium hydroxide solution for co-precipitation to prepare a precursor A; mixing a nickel salt, a cobalt salt, a manganese salt, and a tungsten salt, and adding an ammonia solution and a sodium hydroxide solution for co-precipitation to prepare a W-containing precursor B; and mixing the precursor A, the precursor B, a lithium source, and a doping element M-containing compound, and subjecting a resulting mixture to high-temperature sintering in an oxygen atmosphere to obtain the high-nickel ternary cathode material including both spherical secondary particles and single-crystal particles. While increasing the capacity, the spherical secondary particles in the product of the present disclosure can ensure that a crystal structure will not undergo obvious phase transition when lithium ions are deintercalated during a cycling process, which helps to improve the cycling performance.

The present disclosure relates to a solid electrolyte containing a halide-based nanocomposite, a method for preparing the same and an all-solid-state battery including the solid electrolyte. Halide-based nanocomposites were prepared by the mechanochemical reaction of a lithium oxide precursor, a lithium halide precursor, and a metal halide in order to improve the low ion conductivity and large interfacial resistance of the existing halide-based solid electrolyte. Furthermore, it is possible to provide superior atmospheric stability, improve ion conductivity through activation of interfacial conduction and, at the same time, significantly improve the interfacial stability with a sulfide-based solid electrolyte and high-voltage cycle stability.

The present invention relates to a method of controlling the arrangement of building block nanocrystals in iron oxide mesocrystals by controlling the type of surface ligand, the method including mixing an iron ion precursor and a surface ligand. The present invention can provide nanoparticles having different magnetic properties by controlling the crystallographic arrangement of building block nanocrystals in mesocrystals according to surface ligands.

Provided are a barium titanate powder having spherical shape fine particles which have an average particle diameter (D.sub.50) in a range of about 140-270 nm, a tetragonal structure having a markedly improved tetragonality (c/a) in a range of 1.007-1.01 in contrast to the conventional composition, and at the same time, a markedly improved crystallinity in a range of 93-96%, thereby showing improved dielectric properties, and a manufacturing method thereof.

A method for producing a silica composite particle including a silica particle and at least one compound in which an aluminum atom bonds to an organic group through oxygen. The method includes: (i) providing a silica particle dispersion liquid having a silica particle content of about 20 mass % or more; (ii) mixing and reacting a compound represented by formula (S1) and the silica particle dispersion liquid to obtain a slurry; (iii) providing the at least one compound; and (iv) then mixing and reacting the slurry with the at least one compound to form the silica composite particle.

Provided are a cathode active material having a suitable particle size and high uniformity, and a nickel composite hydroxide as a precursor of the cathode active material. When obtaining nickel composite hydroxide by a crystallization reaction, nucleation is performed by controlling a nucleation aqueous solution that includes a metal compound, which includes nickel, and an ammonium ion donor so that the pH value at a standard solution temperature of 25° C. becomes 12.0 to 14.0, after which, particles are grown by controlling a particle growth aqueous solution that includes the formed nuclei so that the pH value at a standard solution temperature of 25° C. becomes 10.5 to 12.0, and so that the pH value is lower than the pH value during nucleation. The crystallization reaction is performed in a non-oxidizing atmosphere at least in a range after the processing time exceeds at least 40% of the total time of the particle growth process from the start of the particle growth process where the oxygen concentration is 1 volume % or less, and with controlling an agitation power requirement per unit volume into a range of 0.5 kW/m.sup.3 to 4 kW/m.sup.3 at least during the nucleation process.

A process for the recovery of lithium from waste lithium ion batteries or parts thereof is disclosed. The process comprising the steps of A) providing a crude lithium hydroxide as a solid, which contains fluoride; and (B) dissolving the crude lithium hydroxide solid with a lower alcohol such as methanol or ethanol provides good separation of lithium in high purity.

The present disclosure relates to a positive electrode active material, a method of manufacturing the same, and a lithium secondary battery including a positive electrode including the same. The positive electrode active material includes: a lithium transition metal oxide particle in which a portion of Li is substituted with Na, and which includes Ni and Co atoms; and a phosphorus-containing coating layer disposed on the surface of the lithium transition metal oxide particle, wherein the lithium transition metal oxide particle includes a concentration gradient region in which the concentration of Co atoms decreases from the surface toward the center of the particle.

The invention relates to a method for producing sulphur-containing potash granules from fine-particle, potassium-chloride-containing raw materials and elementary sulphur, and to the sulphur-containing potash granules obtained with this method. The method comprises the following steps a) and b): a) mixing a potassium-chloride-containing, fine-particle raw material with a sulphur melt in a quantity of 2 to 30 wt. %, in particular 3 to 25 wt. %, preferably 5 to 23 wt. % and particularly preferably 8 to 20 wt. % in relation to the total amount of sulphur melt and fine-particle raw material, producing a mixture of fine-particle raw material and molten sulphur; and b) compacting the mixture of fine-particle raw material and molten sulphur obtained in step a). The invention also relates to the use of sulphur melts in the production of potassium chloride granules by compacting a potassium-chloride-containing, fine-particle raw material to reduce the pressing force during compacting, and to the use of sulohur melts to improve the mechanical strength of potash granules, containing potassium chloride, in particular potash granules obtained by compacting a sulphur- and potassium-chloride-containing, fine-particle raw material.