A method for preparing a positive electrode active material, a positive electrode active material prepared using the same, and a lithium secondary battery, and in particular, to a method for preparing a positive electrode active material comprising the steps of (a) preparing a coating composition including a precursor of metal-phosphorous-oxynitride; (b) forming a precursor layer on a positive electrode active material with the coating composition of (a) using a solution process; and (c) forming a metal-phosphorous-oxynitride protective layer on the positive electrode active material by heat treating the positive electrode active material having the precursor layer formed thereon. The method for preparing a positive electrode active material uses a solution process, which is advantageous in terms of simplifying the whole process and reducing costs, and high capacity, high stabilization and long lifetime are obtained as well by the formed protective layer having excellent properties.

A poorly crystalline mixed metal manganese oxide material. The mixed metal manganese oxide material may be used for making a cathode for a rechargeable battery. Generally, the mixed metal manganese oxide includes: manganese oxide; copper, silver, gold, or a combination thereof; a first additional cation selected from the group consisting of: bismuth, lead, and mixtures thereof; and a second additional cation selected from the group consisting of: lithium, sodium, potassium, cesium, rubidium, beryllium, magnesium, calcium, strontium, barium, NR.sub.4.sup.+, or a combination thereof, with R being, hydrogen, an alkyl group, an aryl group, or combinations thereof. The amorphous composition has an essentially amorphous x-ray powder diffraction pattern.

Phosphors include a CaAlSiN.sub.3 family crystal phase, wherein the CaAlSiN.sub.3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

A metal oxynitride thin film having a perovskite structure, in which the metal oxynitride thin film has a composition represented by a compositional formula A.sub.1+αBO.sub.x+αN.sub.y wherein α is larger than zero and 0.300 or less, x+α is larger than 2.450, and y is 0.300 or more and 0.700 or less, an AO structure having a layered structure parallel to a plane perpendicular to a c-axis of the perovskite structure and having a composition represented by a general formula AO, and the AO structure is bonded with the perovskite structure and incorporated in the perovskite structure.

A capacitive element and a dielectric thin film having a small dielectric loss and a large relative permittivity, particularly at low frequencies. [Solution] This dielectric thin film includes an A-B—O—N oxynitride. When the A-B—O—N oxynitride is represented by the compositional formula A.sub.aB.sub.bO.sub.oN.sub.n, (o+n)/a<3.00 is satisfied.

An alkali metal amide is dissolved in a cyclic alkylene urea represented by the formula (1) (wherein each of R.sub.1 and R.sub.2 represents a C1 to C3 alkyl group, and R.sub.3 represents a C1 to C4 alkylene group).

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A component for a lithium battery including a first layer including a lithium garnet having a porosity of 0 percent to less than 25 percent, based on a total volume of the first layer; and a second layer on the first layer and having a porosity of 25 percent to 80 percent, based on a total volume of the second layer, wherein the second layer is on the first layer and the second layer has a composition that is different from a composition of the first layer.

To provide a dielectric composition having excellent reliability. The dielectric composition contains a main component represented by a composition formula (Sr.sub.1-xCa.sub.x).sub.m(Ti.sub.1-yHf.sub.y)O.sub.3-δN.sub.δ, in which 0.15<x≤0.90, 0<y≤0.15, 0.90≤m≤1.15, 0<δ≤0.05 are satisfied.

A composition for catalysis of a Haber-Bosch process comprises an anion vacant lattice and a Haber-Bosch catalyst (e.g. Fe Ru). Suitable anion vacant lattices include oxynitrides and oxides, which may be doped or undoped, including Ce.sub.aM.sub.bO.sub.2-XN.sub.Y (Formula III) M is one or more elements with a valence lower than +4. “a” and “b” are independently in the range 0.05 to 0.95, with the proviso that “a” and “b” together sum to 1 (approximately). X is greater than 0 and less than 2. Y is greater than zero and less than or equal to X. A process employing the composition produces ammonia.

An electrochemically active material includes an alloy represented by general formula (I): Si.sub.aTi.sub.bO.sub.cN.sub.dM.sub.e, (I) where a, b, c, d, and e represent atomic % values, a+b+c+d+e=100, M includes carbon or a transition metal element other than titanium, a>20, a+b+e≥c+d, c≥0, d>5, e≥0, and a/b>0.5. The alloy includes a transition metal silicide, titanium nitride, or titanium oxynitride phase, and the phase has a Schemer grain size that is greater than 2 nm and less than 10 nm.