A positive electrode active material for a non-aqueous electrolyte secondary battery according to a configuration includes a lithium-transition metal composite oxide containing nickel (Ni) in an amount of greater than or equal to 80 mol %, in which boron (B) is present at least on a particle surface of the lithium-transition metal composite oxide. In the lithium-transition metal composite oxide, when particles having a larger particle size than a volume-based 70% particle size (D70) are first particles and particles having a smaller particle size than a volume-based 30% particle size (D30) are second particles, a coverage ratio of B on surfaces of the first particles is larger than a coverage ratio of B on surfaces of the second particles by 5% or greater.

By a method including at least a spraying/mixing step of: mixing a precursor compound of a positive electrode active material with a lithium compound to prepare a mixture; and simultaneously spraying a spraying agent containing at least one element onto the mixture, there can be produced a positive electrode active material for non-aqueous electrolyte secondary batteries, which does not adversely affect battery properties of non-aqueous electrolyte secondary batteries, without reducing production efficiency.

A cathode active material for a lithium secondary battery comprises a lithium metal oxide that has a layered crystal structure and contains nickel and aluminum. The lithium metal oxide contains 70 mol % or more of nickel based on a total number of moles of all elements excluding lithium and oxygen. A ratio of lithium sites occupied by nickel instead of lithium among all lithium sites in the lithium metal oxide is in a range from 1% to 3.5%. A weight ratio of aluminum to nickel in the lithium metal oxide is in a range from 1/550 to 1/100.

The present application discloses a positive electrode active material including a lithium nickel cobalt manganese oxide, the molar content of nickel in the lithium nickel cobalt manganese oxide accounts for 60%-90% of the total molar content of nickel, cobalt and manganese, and the lithium nickel cobalt manganese oxide has a layered crystal structure of a space group R 3m; a transition metal layer of the lithium nickel cobalt manganese oxide includes a doping element, and the local mass concentration of the doping element in particles of the positive electrode active material has a relative deviation of 20% or less; and in a differential scanning calorimetry spectrum of the positive electrode active material in a 78% delithiation state, an initial exothermic temperature of a main exothermic peak is 200° C. or more, and an integral area of the main exothermic peak is 100 J/g or less.

A positive electrode active material for a non-aqueous electrolyte secondary battery includes LiX, where X represents a halogen atom.

The present disclosure relates to methodologies, systems and apparatus for generating lithium ion battery materials. Starting materials are combined to form a homogeneous precursor solution including lithium, and a droplet maker is used to generate droplets of the precursor solution having controlled size. These droplets are introduced into a microwave generated plasma, where micron or sub-micron scale lithium-containing particles are formed. These lithium-containing particles are collected and formed into a slurry to form lithium ion battery materials.

The present invention belongs to the field of materials, and relates to an environment-friendly precursor, a cathode material for a lithium-ion battery, and preparation methods thereof. The method for preparing an environment-friendly precursor provided in the present invention includes: subjecting a metal and/or a metal oxide, an oxidant, water, and a complexing agent to a chemical corrosion crystallization reaction at an electrical conductivity equal to or greater than 200 uS/cm, a redox potential ORP value equal to or less than 100 my, and a complexing agent concentration of 3-50 g/L. The precursor prepared by using the method provided in the present invention has advantages that no waste water is produced during dissolution and crystallization, and that water is constantly consumed, so that the purpose of environmental friendliness can be achieved. Moreover, the first charge and discharge efficiency of a lithium-ion battery can be effectively improved by means of the precursor.

A positive electrode active material contains a lithium transition metal composite oxide that contains 85% by mole or more of Ni relative to the total number of moles of metal elements excluding Li and at least one metal element M1 that is selected from among Mg, Ti, Nb, Zr and V in an amount of 3% by mole or less relative to the total number of moles of metal elements excluding Li. The ratio of the concentration of metal element M1 contained in the shell of each primary particle of the composite oxide to the concentration of metal element M1 contained in the core is from 1.01 to 20; and at least one metal element M2 of Ca and Sr is on the surface of each primary particle in an amount of 1% by mole or less relative to the total number of moles of metal elements excluding Li.

A process is described for producing mixed oxide in particulate form, comprising cations of lithium and cations of at least two transition metals selected from the group consisting of nickel, cobalt, manganese, titanium, vanadium, chromium and iron, as are mixed oxides produced by this process.

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li.sub.1+aNi.sub.bMn.sub.cCo.sub.dTi.sub.eM.sub.fO.sub.2+α, and has an atomic ratio Ti.sup.3+/Ti.sup.4+ between Ti.sup.3+ and Ti.sup.4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and α are numbers satisfying −0.1≦a≦0.2, 0.7<b≦0.9, 0≦c<0.3, 0≦d<0.3, 0<e≦0.25, 0≦f<0.3, b+c+d+e+f=1, and −0.2≦α≦0.2.