A wavelength converter material and a method of A method of preparing a wavelength converter material may include providing an optionally oxide coated phosphor material, mixing the optionally oxide coated phosphor material with an optionally oxide coated paramagnetic nanoparticle, coating the optionally oxide coated phosphor material and the optionally oxide coated paramagnetic nanoparticle with an oxide coating, thereby preparing a coated phosphor-nanoparticle particle, and separating the coated phosphor-nanoparticle particle, thereby preparing a wavelength converter material. The separating of the coated phosphor-nanoparticle particle may be manipulated by applying a magnetic field.

Furthermore, a wavelength converter material, as well as a light emitting diode are described herein.

A positive electrode active material for lithium secondary batteries includes a lithium composite metal compound containing secondary particles that are aggregates of primary particles which are capable of being doped or dedoped with lithium ions and satisfies all of specific requirements (1) to (4).

Compounds, particles, and cathode active materials that can be used in lithium ion batteries are described herein. Methods of making such compounds, powders, and cathode active materials are described. The particles have a particle size distribution with a D50 ranging from 10 μm to 20 μm.

A prussian blue analog having a core-shell structure, which has a core and a cladding layer that dads the core, wherein

the chemical formula of the core is the following Formula 1,

Na.sub.xP[R(CN).sub.6].sub.δ.zH.sub.2O and the chemical formula of the cladding layer is the following Formula 2, A.sub.yL[M(CN).sub.6].sub.α.wH.sub.2O is described. The prussian blue analog has good storage stability, and thus can greatly reduce the manufacturing cost at the subsequent battery cell level. A method for preparing the prussian blue analog having a core-shell structure, as well as a sodium-ion secondary battery, a battery module, a battery pack and a powered device comprising the same are described.

The disclosure provides a II-II-VI alloy quantum dot, a preparation method and application thereof. The preparation method includes: step S1: reacting a precursor containing a second Group II element and a precursor containing a first Group VI element to form a II-VI semiconductor nanocluster; step S2: mixing the II-VI semiconductor nanocluster with a precursor containing a first Group II element, and performing cation exchange and in-situ growth to obtain a first system containing the II-II-VI alloy quantum dot.

This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li.sub.1+a[Ni.sub.xCo.sub.yMn.sub.zM.sub.bM′.sub.c]O.sub.2−dY.sub.d, where distribution of each of the doping elements M, M′, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.

The present disclosure discloses a lithium-manganese rich material and a preparation method and a use thereof.

The present exemplary embodiments relate to a cathode active material, a manufacturing method thereof, and a lithium secondary battery including the same. A cathode active material according to an exemplary embodiment is a lithium metal oxide particle in the form of a secondary particle including a primary particle, a coating layer including a boron compound is positioned on at least a portion of a surface of the primary particle, and the boron compound includes an amorphous structure.

A negative electrode active material, including: a graphite core; a first carbon coating layer on the graphite core; and a second carbon coating layer on the first carbon coating layer, wherein a crystallinity of the second carbon coating layer is lower than a crystallinity of the first carbon coating layer, or the second carbon coating layer includes hard carbon and the first carbon coating layer includes soft carbon. A negative electrode including the negative electrode active material and a lithium secondary battery including the same are also disclosed.

The present invention comprises, in lithium composite oxide particles, an overlithiated oxide having a layered crystal structure and represented by chemical formula 1 below, and comprises a lithium manganese oxide represented by chemical formula 2 below outside the lithium composite oxide particles, wherein the overlithiated oxide included in the particles and the lithium manganese oxide included outside the particles have different Li/IM values. [Chemical formula 1] rLi.sub.2MnO.sub.3.(1-r)Li.sub.aNi.sub.xCo.sub.yMn.sub.zM1.sub.1-(x+y+z)O.sub.2 (wherein, in chemical formula 1, 0<r≤0.6, 0<a≤1, 0≤x≤1, 0≤y<1, 0≤z<1, and 0<x+y+z≤1, and M1 is at least any one selected from Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sin, Ca, Ce, Fe, Al, Ta, Mo, Se, Zn, Nb, Cu, in, S, B, and Bi) [Chemical formula 2] Li.sub.bMn.sub.pO.sub.q (wherein, in chemical formula 2, 0.1≤b/p≤2.5 and 0<q≤15).