Provided are a lithium nickel manganese oxide composite material, a preparation method thereof and a lithium ion battery. The preparation method includes: a first calcining process is performed on a nano-oxide and a nickel-manganese precursor, to obtain an oxide-coated nickel-manganese precursor; and a second calcining process is performed on the precursor and a lithium source material, to obtain the lithium nickel manganese oxide, and a temperature of the first calcining process is lower than the second calcining process. At a lower temperature, the nano-oxide may be melted, a denser nano-oxide coating layer is formed on the surface of the precursor, so the oxide-coated nickel-manganese precursor is obtained. At a higher temperature, the nano-oxide, a nickel-manganese material and a lithium element may be more deeply combined. A problem that the nano-oxide layer is easy to fall off is solved, and cycle performance of the lithium nickel manganese oxide is greatly improved.

A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium-nickel-cobalt-zinc composite oxide powder that contains lithium (Li); nickel (Ni); cobalt (Co); element M, which is at least one element selected from the group consisting of manganese (Mn), vanadium (V), magnesium (Mg), molybdenum (Mo), niobium (Nb), silicon (Si), titanium (Ti), and aluminum (Al); and zinc (Zn). A molar element ratio (Li:Ni:Co:M) of the lithium-nickel-cobalt-zinc composite oxide powder satisfies Li:Ni:Co:M=z:(1-x-y):x:y (where 0.95≤z≤1.10, 0.05≤x≤0.35, and 0≤y≤0.10); a zinc content with respect to Li, Ni, Co, the element M, and oxygen in the lithium-nickel-cobalt-zinc composite oxide powder is greater than or equal to 0.01 mass % and less than or equal to 1.5 mass %; and at least a part of a surface of the lithium-nickel-cobalt-zinc composite oxide powder includes a zinc solid-solved region where zinc is solid-solved.

Provided is a charge-adjustment powder having an excellent ability to regulate a charging property on a surface of a target to be charge-adjusted within a certain range, and to maintain the applied charge. The charge-adjustment powder is formed with particles having titanium-niobium oxide on at least a part of a surface of a core, and the content of an alkali metal is set to be 20.0 mmol/kg or less based on the whole.

A method of preparing a bimodal positive electrode active material precursor and a positive electrode active material prepared from the same are disclosed herein. In some embodiments, the method includes inputting a first reaction source material including a first aqueous transition metal solution into a reactor, precipitating at pH 12 or more to induce nucleation of a first positive electrode active material precursor particle, and at less than pH 12 to induce growth of the same, inputting a second reaction source material including a second aqueous transition metal solution into the reactor containing the first positive electrode active material precursor particle, precipitating at pH 12 or more to induce the nucleation of a second positive electrode active material precursor particle, and at less than pH 12 to induce simultaneous growth of the first and second positive electrode active material precursor particles, thereby preparing a bimodal positive electrode active material precursor.

The positive electrode active material of the present disclosure includes a complex oxide represented by formula (1): LiNi.sub.xMe.sub.1-xO.sub.2 as a main component and has a hydrogen element content of 238.8 ppm by mass or less. Here, x satisfies 0.5≤x≤1, and Me is at least one element selected from the group consisting of Mn, Co, and Al.

A method of preparing a positive electrode active material is disclosed herein. In some embodiments, the method includes firing a first mixture at 400° C. to 700° C. to prepare a primary firing product, wherein the first mixture has a positive electrode active material precursor having a specific composition, a first lithium-containing source material, and optionally, an aluminum-containing source material, and firing a second mixture at a temperature above the firing temperature of the first mixture to prepare a positive electrode active material, wherein the second mixture has the primary firing product, a second lithium-containing source material, and a specific doping element M.sup.1-containing source material. The method is capable of degrading the cake strength of a primary firing product and providing a positive electrode active material having excellent quality by dividing a firing process into two steps.

Provided are a cathode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery containing a cathode including the cathode active material, in which the cathode active material includes nickel-based lithium metal oxide containing single-crystal particles, and a particle size of the single-crystal particles is about 1 μm to about 8 μm, and a particle size distribution of the single-crystal particles expressed by (D90-D10)/D50 is 1.4 or less.

Provided are alumina particles containing molybdenum and with their shape controlled. The alumina particles contain phosphorus and molybdenum. The alumina particles are preferably plate-like or card house-like. The phosphorus is preferably unevenly distributed in surface layers of the alumina particles. Also provided are a resin composition containing the alumina particles and a resin, a molded body made by molding the resin composition, and a method for producing the alumina particle including a step of firing the aluminum compound in the presence of a molybdenum compound and a phosphorous compound.

A dispersion, methods of making the same, applications of the dispersion to graphitic material and the resulting coated particles are disclosed. The dispersion includes ≤55% wt. coal tar pitch (softening point 100° C.-95° C.), ≤60% wt. dispersant, and the balance a non-aromatic solvent such as water or alcohol. Pitch particles in the dispersion are preferably ≤10 μm with a distribution of D50<15 μm. The pitch particles are micronized, such as by dry and/or wet milling with the dispersant and aqueous solvent to achieve the desired pitch particle size and distribution. This aqueous dispersion may be mixed with natural or synthetic graphitic material having a diameter of 5-20 μm in a ratio of 5%-30% pitch to graphite, dried and carbonized to form coated particles having a graphitic core at least partially coated by pitch particles.

The present invention relates to core shell silica particles, wherein each core shell silica particle comprises a silica core, and a surface of the silica core is etched with metal silicate, the core shell silica particles prepared by: i) admixing an amount of silica particles in water with an amount of a base, wherein the base comprises a monovalent metal ion, to produce core shell silica particles, each core shell silica particle comprising a silica core, and a surface of the silica core etched with a silicate of the monovalent metal ion; and ii) reacting the core shell silica particles formed in step i) with a metal salt comprising a second metal ion, to form core shell silica particles comprising silicate of the second metal ion on the surface of the silica core.