Process for making a particulate (oxy)hydroxide of TM wherein TM comprises nickel and where-in said process comprises the steps of: (a) Providing an aqueous solution (α) containing water-soluble salts of Ni and of at least one transition metal selected from Co and Mn, and, optionally, at least one further metal sel-ected from Ti, Zr, Mo, W, Al, Mg, Nb, and Ta, and an aqueous solution (β) containing an alkali metal hydroxide and, optionally, an aqueous solution (γ) containing ammonia, (b) combining a solution (α) and a solution (β) and, if applicable, a solution (γ) at a pH value in the range of from 12.0 to 13.0 in a stirred tank reactor, thereby creating solid particles of a hydroxide containing nickel, said solid particles being slurried, (c) transferring said slurry into another stirred tank reactor and combining it with a solution (α) and a solution (β) and, if applicable, a solution (γ) at a pH value in the range of from 11.0 to 12.7 and at conditions wherein the solubility of nickel is higher than in step (b), wherein the stirring speed is reduced in the course of step (c).

A quantum dot luminescent material and a method of producing thereof. The quantum dot luminescent material includes a hole injection layer, a hole transport layer, a quantum dot light emitting layer, an electron transport layer, and an electron injection layer. The quantum dot luminescent layer is located on the hole transport layer, and the quantum dot luminescent layer includes uniformly distributed perovskite nanodots.

The present invention belongs to the field of battery materials, and relates to a process for preparing a particulate lithium manganese nickel spinel compound, and materials produced by the process. The process of the invention uses Mn-containing precursors, Ni-containing precursors, Li-containing precursors and optionally M-containing precursor which form substantially no NOx ases during calcination. The particulate lithium manganese nickel spinel compound product of the process may find use in a lithium ion battery.

The present invention belongs to the field of battery materials, and relates to a process for preparing a particulate lithium manganese nickel spinel compound, and materials produced by the process. The process of the invention uses Mn-containing precursors, Ni-containing precursors, Li-containing precursors and optionally M-containing precursor which form substantially no NOx ases during calcination. The particulate lithium manganese nickel spinel compound product of the process may find use in a lithium ion battery.

A nickel-based hydroxide powder is provided which has an average crystallite size, as determined by Scherrer fitting of the (00I) reflections of an XRD powder diffraction pattern of the nickel-based hydroxide powder, of at most 10 nm, together with a process for producing nickel-based hydroxide powders. The nickel-based hydroxide powders find utility as precursors for the formation of lithium transition metal oxide active electrode materials.

Process for making a manganese composite (oxy)hydroxide with a mean particle diameter D50 in the range from 2 to 16 μm comprising the step(s) of combining (a) an aqueous solution containing salts of nickel and of manganese, and, optionally, at least one of Al, Mg, or transition metals other than nickel and manganese wherein at least 50 mole-% of the metal is manganese, (b) with an aqueous solution of an alkali metal hydroxide and (c) an organic acid or its alkali or ammonium salt wherein said organic acid bears at least two functional groups per molecule and at least one of the functional groups is a carboxylate group.

Process for making a manganese composite (oxy)hydroxide with a mean particle diameter D50 in the range from 2 to 16 μm comprising the step(s) of combining (a) an aqueous solution containing salts of nickel and of manganese, and, optionally, at least one of Al, Mg, or transition metals other than nickel and manganese wherein at least 50 mole-% of the metal is manganese, (b) with an aqueous solution of an alkali metal hydroxide and (c) an organic acid or its alkali or ammonium salt wherein said organic acid bears at least two functional groups per molecule and at least one of the functional groups is a carboxylate group.

The invention relates to a method for preparing materials with composition gradient characteristics. After mixing a lithium source with the prepared precursor, raise the temperature from room temperature to 300° C.˜600° C. at 2° C./min˜10° C./min and maintain it, and then sinter for 5 hours˜18 hours, cool with the furnace, then raise the temperature from room temperature to 600° C.˜1200° C. at 2° C./min˜10° C./min and maintain it, and sinter for 5 hours˜18 hours, and the material is thus obtained. The material prepared with the method provided by the invention has composition gradient characteristic, and its application to the positive electrode of battery enables the battery to have higher energy density and better thermal stability, and prolonged service life.

The invention relates to a method for preparing materials with composition gradient characteristics. After mixing a lithium source with the prepared precursor, raise the temperature from room temperature to 300° C.˜600° C. at 2° C./min˜10° C./min and maintain it, and then sinter for 5 hours˜18 hours, cool with the furnace, then raise the temperature from room temperature to 600° C.˜1200° C. at 2° C./min˜10° C./min and maintain it, and sinter for 5 hours˜18 hours, and the material is thus obtained. The material prepared with the method provided by the invention has composition gradient characteristic, and its application to the positive electrode of battery enables the battery to have higher energy density and better thermal stability, and prolonged service life.

A layered double hydroxide is represented by the following formula (I): Ni.sup.2+.sub.1−(x+y+z)Fe.sup.3+.sub.xV.sup.3+.sub.yCo.sup.3+.sub.z(OH).sub.2A.sup.n−.sub.(x+y+z)/n.Math.mH.sub.2O . . . (I). In one embodiment, in the formula (I), (x+y+z) is from 0.2 to 0.5, “x” represents more than 0 and 0.3 or less, “y” represents from 0.04 to 0.49, and “z” represents more than 0 and 0.2 or less.