Process for making a mixed oxide according to the formula Li.sub.1+xTM.sub.1−xO.sub.2 wherein x is in the range of from 0.1 to 0.2 and TM is a combination of elements according to general formula (I) (Ni.sub.aCo.sub.bMn.sub.c).sub.1-dM.sup.1.sub.d (I) wherein a is in the range of from 0.30 to 0.38, b being in the range of from zero to 0.05, c being in the range of from 0.60 to 0.70, and d being in the range of from zero to 0.05, M.sup.1 is selected from Al, Ti, Zr, W, Mo, Nb, Ta, Mg and combinations of at least two of the forego-ing, a+b+c=1, said process comprising the following steps: (a) providing a particulate hydroxide, oxide or oxyhydroxide of manganese, nickel, and, optionally, at least one of Co and M.sup.1, (b) adding a source of lithium, (c) calcining the mixture obtained from step (b) thermally under an atmosphere comprising 0.05 to 5 vol.-% of oxygen at a maximum temperature the range of from 650 to 1000° C.

A positive electrode active material, a positive electrode including the positive electrode active material, and a lithium secondary battery including the same are disclosed herein. In some embodiments, the positive electrode active material includes a lithium transition metal oxide containing nickel in an amount of 60 mol% or greater based on a total number of moles of transition metals in the lithium transition metal oxide, and in the form of a secondary particle which is an aggregate of primary particles. The positive active material satisfies Equation (1) : -0.021x + 4.0 ≤ y ≤ -0.021x + 5.5, wherein x is a crystal grain size (nm) of the positive electrode active material, and y is a crystal grain aspect ratio of the positive electrode active material.

A method of making an atomic layer nanoribbon that includes forming a double atomic layer ribbon having a first monolayer and a second monolayer on a surface of the first monolayer, wherein the first monolayer and the second monolayer each contains a transition metal dichalcogenide material, oxidizing at least a portion of the first monolayer to provide an oxidized portion, and removing the oxidized portion to provide an atomic layer nanoribbon of the transition metal dichalcogenide material. Also provided are double atomic layer ribbons, double atomic layer nanoribbons, and single atomic layer nanoribbons prepared according to the method.

Lithium-ion battery (LIB) recycling is considered as an important component to industry sustainability. A massive number of LIBs in portable electronics, electric vehicles and grid storage will eventually end up in wastes, leading to serious economic and environmental problems. Hence, tremendous effort has been made to improve hydrometallurgical recycling process since it is the most promising option for handling end-of-life LIBs owing to its wide applicability, low cost and high productivity. Despite these advantages, some extra elements (Al, Fe, C, F, etc.) remain as impurities in the removal process and remain in the solution, presenting a challenge to obtaining high-quality cathode material. This approach demonstrates the improved electrochemical performance by adding potential impurities in the leaching solution.

A stabilized lithium metal oxide cathode material comprises microparticles of lithium metal oxide in which individual particles thereof a core of lithium metal oxide and a coating of a different lithium metal oxide surrounding the core. There is an interface layer between the cores and the coatings in which there are gradients of metal ions in the direction of coating to core. The materials are made by a three stage process involving coprecipitating precursor metal hydroxide core particles at a controlled pH; coprecipitating a different metal hydroxide coating on the particles without controlling the pH; and then calcining the resulting coated precursor particles with lithium hydroxide to form the stabilized lithium metal oxide material.

Provided are processes for the production of particles for use as a precursor material for synthesis of Li-ion cathode active material of a lithium-ion cell comprising: a non-lithiated nickel oxide particle of the formula MO.sub.x wherein M comprises 80 at % Ni or greater and wherein x is 0.7 to 1.2, M optionally excluding boron in the MO.sub.x crystal structure; and a modifier oxide intermixed with, coated on, present within, or combinations thereof the non-lithiated nickel oxide particle, wherein the modifier oxide is associated with the non-lithiated nickel oxide such that a calcination at 500 degrees Celsius for 2 hours results in crystallite growth measured by XRD of 2 nanometers or less.

A method for producing a metal composite hydroxide, which includes a first crystallization process of obtaining first metal composite hydroxide particles by supplying a first raw material aqueous solution containing a metal element and an ammonium ion donor to a reaction tank, adjusting a pH of a reaction aqueous solution in the reaction tank, and performing a crystallization reaction and a second crystallization process of forming a tungsten-concentrated layer on a surface of the first metal composite hydroxide particles and obtaining second metal composite hydroxide particles by supplying a second raw material aqueous solution containing a metal element and a more amount of tungsten than the first raw material aqueous solution and an ammonium ion donor to a reaction aqueous solution containing the first metal composite hydroxide particles, adjusting a pH of the reaction aqueous solution, and performing a crystallization reaction, and the like.

It is related to a positive active material for lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery containing the same, provides that a positive active material for lithium secondary battery, wherein, it is a layered lithium metal compound comprises nickel, cobalt, and manganese, and aluminum, zirconium, and boron are doped.

The cathode active material for a lithium secondary battery according to embodiments of the present invention includes lithium-transition metal composite oxide particles including a plurality of primary particles, and the lithium-transition metal composite oxide particles have a lithium-potassium-containing portion formed between the primary particles. Thereby, it is possible to improve life-span properties and capacity properties by preventing the layer structure deformation of the primary particles and removing residual lithium.

The present invention provides a process is presented for preparing a positive electrode active material for rechargeable lithium ion batteries. The process comprises a sintering step having a short sintering time. This improves the production throughput. More particularly, the process applies to positive electrode active material powders having a general formula Li.sub.(1+a)(Ni.sub.xMn.sub.yCo.sub.zMe.sub.c).sub.(1−a)O.sub.2, wherein Me comprises at least one element of the group consisting of Al, Mg, Ti, Zr, W, Nb, B, and Sr, with −0.1≤a≤0.1, 0.33≤x≤0.95, 0≤y≤0.35, 0<z≤0.35, 0≤c≤0.05, and x+y+z+c=1. The sintering step is performed for a predefined sintering time t.sub.s, expressed in hours, and at a predefined temperature T.sub.s, expressed in ° C., such that 0.3≤t.sub.s≤6.0, and 1140+50 Log.sub.10 (6/t)−580 x≤T.sub.s≤1245+50 Log.sub.10(6/t.sub.s)−580 x.