An object of the present invention is to provide ferrite particles for supporting a catalyst having a small apparent density, various properties are maintained in a controllable state and a specified volume is filled with a small weight, and a catalyst using the ferrite particles for supporting a catalyst. To achieve the object, ferrite particles for supporting a catalyst provided with an outer shell structure containing Ti oxide, a catalyst using the ferrite particles for supporting a catalyst are employed.

A method of encapsulating pigment flakes with a metal oxide coating is provided. According to the method, pigment flakes are mixed with a solvent, a metal salt is added to the solvent, and a reducing agent is added to the solvent, so as to encapsulate the pigment flakes with a metal oxide coating.

The present invention provides a positive electrode active material for a secondary battery, which includes a core, a shell disposed to surround the core, and a buffer layer which is disposed between the core and the shell and includes pores and a three-dimensional network structure connecting the core and the shell, wherein, the core, the shell, and the three-dimensional network structure of the buffer layer each independently include a lithium nickel manganese cobalt-based composite metal oxide and at least one metallic element of the nickel, the manganese, and the cobalt has a concentration gradient that gradually changes in any one region of the core, the shell, and the entire positive electrode active material.

Controlled height carbon nanotube arrays including catalysts and synthesis methods relating thereto are disclosed. Such nanotube arrays can be prepared from catalyst particles having an Fe:Co:Ni molar ratio impregnated in an exfoliated layered mineral to grow carbon nanotube arrays where the Fe:Co:Ni molar ratio of the catalyst is used to control the height of the array.

The invention generally relates to electrochemically active structures and methods of making thereof. More specifically, the invention relates to electrochemically active structure comprising a crystalline electride comprising a nitride or carbide of at least one of: an alkaline earth metal, a transition metal, a lanthanide metal, or a combination thereof, wherein the electride has a lattice capable of intercalating at least one ion, thereby releasing at least one electron into an external circuit; and wherein a change in lattice volume of the electride upon intercalating the at least one ion is less than about 40%. Further, methods of making these electrochemically active structures are disclosed. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

The present application discloses a composite graphite material, a secondary battery, an apparatus and a preparation method thereof. The composite graphite material includes a core material and a coating layer coating at least a part of the surface of the core material, the core material including graphite; wherein the absolute value K of zeta potential of the composite graphite material in deionized water with a pH of 7 is at least 20 mV. The use of the composite graphite material provided by the present application can improve the cohesion and bonding force of the negative electrode plate, thereby reducing the cyclic expansion of the secondary battery.

Compositions comprising hydrogenated and dehydrogenated graphite comprising a plurality of flakes. At least one flake in ten has a size in excess of ten square micrometers. For example, the flakes can have an average thickness of 10 atomic layers or less.

The present disclosure provides a lithium-rich carbonate precursor, a preparation method therefor, and an application thereof. The lithium-rich carbonate precursor has a solid spherical structure, and the chemical formula of the lithium-rich carbonate precursor is Ni.sub.xCo.sub.yMn.sub.(1−x−y)CO.sub.3. The precursor has the advantages of having controllable particle size, uniform particle size distribution, high sphericity, high tap density, good fluidity, and excellent electrochemical performance and energy density.

A method for reusing a positive electrode active material includes dry-milling a positive electrode scrap comprising an active material layer on a current collector to convert the active material layer into a powdered state and to separate the active material layer from the current collector. The active material layer is a lithium composite transition metal oxide positive material active material layer. The method further includes adding a lithium precursor to a the active material layer. The method further includes thermally treating the active material layer in the powdered state to collect an active material. The method further includes obtaining a reusable active material by washing the collected active material with a basic lithium compound aqueous solution and drying the collected active material.

A composite nanomaterial of ZnO impregnated by, e.g., a green copper phthalocyanine compound (CuPc) can be an efficient solar light photocatalyst for water remediation. The composite may include hollow shell microspheres and hollow nanospheres of CuPc-ZnO. CuPc may function as a templating and/or structure modifying agent, e.g., for forming hollow microspheres and/or nanospheres of ZnO particles. The composite can photocatalyze the degradation of organic pollutants such as crystal violet (CV) and 2,4-dichlorophenoxyacetic acid as well as microbes in water under solar light irradiation. The ZnO-CuPc composite can be stable and recyclable under solar irradiation.