Disclosed herein is a process for making a particulate oxyhydroxide or oxide of TM with a bimodal particles diameter distribution where TM represents metals, and where TM includes nickel and at least one metal is selected from the group consisting of cobalt and manganese.

A ferrite composition having a formula of Ba.sub.xNi.sub.2-yCu.sub.yTi.sub.3Fe.sub.zO.sub.31, wherein 4.5?x?5.5 0<y<2 or 0.05?y?1.5, and 11?z?13.

A sodium-containing oxide positive electrode material and a preparation method therefor and use thereof are disclosed. Also disclosed are a positive electrode plate and uses thereof.

The present invention provides a multi-element, regionally doped, cobalt-free positive electrode material, which has a molecular formula of Li.sub.xNi.sub.aMn.sub.bAl.sub.cMg.sub.dW.sub.eO.sub.2, wherein 0.95?x?1.1, 0.5?a?0.9, 0.1?b?0.5, 0?c?0.01, 0?d?0.01, 0?e?0.01, and a+b=1. The positive electrode material comprises an Al-doped region, an Mg-doped region and a W-doped region in an order from the inside to the outside. Also provided is a method of preparing the positive electrode material. The cobalt-free positive electrode material of the present invention can better adapt to a stress release by the positive electrode material regionally doped with Al, Mg, and W elements, achieving a moderate adjustment and avoiding imbalance, so that the material has more stable structure, and better rate performance and cycle performance. The method of preparing the material has a simple process, is easy to implement, and can stably prepare a positive electrode material with excellent structure and performance.

A method for producing a positive electrode material for a nonaqueous secondary battery includes the steps of mixing a compound containing lithium, a compound containing nickel and BaTiO.sub.3 to form a mixed material; and sintering the mixed material to form a lithium transition metal composite oxide.

A positive electrode active material comprising a lithium metal composite oxide having a layered crystal structure provides a novel lithium metal composite oxide powder which can suppress the reaction with an electrolytic solution and raise the charge-discharge cycle ability of a battery, and can improve the output characteristics of a battery. A lithium metal composite oxide powder comprises a particle having a surface portion where one or a combination of two or more (surface element A) of the group consisting of Al, Ti and Zr is present, on the surface of a particle comprising a lithium metal composite oxide having a layered crystal structure, wherein the amount of surface LiOH is smaller than 0.10% by weight, and the amount of surface Li.sub.2CO.sub.3 is smaller than 0.25% by weight; in an X-ray diffraction pattern, the ratio of an integral intensity of the (003) plane of the lithium metal composite oxide to that of the (104) plane thereof is higher than 1.15; and the amount of S obtained by a measurement using ICP is smaller than 0.10% by weight of the lithium metal composite oxide powder (100% by weight).

A NiHf- or NiTi-doped Co.sub.2Y-type ferrite, having a formula of

Ba.sub.n-xSr.sub.xCo.sub.2-yCu.sub.yNi.sub.zHf.sub.zFe.sub.(m-2z)O.sub.22

or

Ba.sub.n-xSr.sub.xCo.sub.2-yCu.sub.yNi.sub.zTi.sub.zFe.sub.(m-2z)O.sub.22

wherein 2?n?2.4. 0?x?1, 0.1?y?1, 0<z?2, and 10?m?13.

A positive electrode active material includes a lithium transition metal oxide and a coating element M.sup.3-containing coating layer formed on a surface of the lithium transition metal oxide, wherein M.sup.3 comprises at least one of Al, Ti, Mg, Zr, W, Y, Sr, or Co, wherein the lithium transition metal oxide is doped with a doping element M.sup.2, wherein M.sup.2 includes at least one of Al, Ti, Mg, Zr, W, Y, Sr, Co, F, Si, Na, Cu, Fe, Ca, S, or B, wherein the lithium transition metal oxide has a single particle form, and includes a center portion having a layered structure and a surface portion having a rock-salt structure, and the total amount of the doping element M.sup.2 and the coating element M.sup.3 is in a range of 4,580 ppm to 9,120 ppm based on a total weight of the positive electrode active material.

The present application provides a positive electrode active material and the preparation thereof, a secondary battery, a battery module, a battery pack, and electrical device. The positive electrode active material of the present application comprises a layered sodium composite oxide containing antimony having a chemical formula of Formula I, Na.sub.xMn.sub.aFe.sub.bNi.sub.cSb.sub.dL.sub.eO.sub.2 (I), in which 0.7<x?1, 0<a, 0?b, 0.1<c?0.3, 0<d?0.1, 0?e, a+b+c+d+e=1, (b+c)/(a+d+e)?1, and L is one or more selected from Cu, Li, Ti, Zr, K, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, Al, Si, La, Ta, P, and B. The layered sodium composite oxide containing antimony of the present application, by being doped with specific metal Sb, has high stability to water.

Described herein is a process for making a nickel composite hydroxide with a mean particle diameter d50 in the range from 3 to 20 ?m including combining (a) an aqueous solution of water-soluble salts of nickel and of at least one of cobalt and manganese, and, optionally, at least one of Al, Mg, B, or transition metals other than nickel, cobalt, and manganese, (b) an aqueous solution of an alkali metal hydroxide and (c) an aqueous solution of alkali metal (bi)carbonate or ammonium (bi)carbonate in the molar ratio of 0.001:1 to 0.04:1, and, optionally, (d) an aqueous solution of alkali metal aluminate,
in a continuous stirred tank reactor or in a cascade of at least two continuous stirred tank reactors.