The present disclosure is directed to novel germanosilicate compositions and methods of producing and using the same. In particular, this disclosure describes new germanosilicates of CIT-14 topology. The disclosure also describes methods of preparing and using these new germanosilicate compositions as well as the compositions themselves.

A positive electrode active material for a lithium secondary battery, containing at least Li, Ni, an element X, and a carbon atom, in which the element X is one or more elements selected from the group consisting of Al, Ti, Nb, B, W, Zr, Mg, Sn, and P, and (1) and (2) are satisfied.

Cx/Cy≤10  (1)

0<(Cy/Cz)≤100  (2) (In (1) or (2), Cx is an abundance (mass %) of the element X obtained by measurement using X-ray photoelectron spectroscopy. Cy is an abundance (mass %) of the carbon atom obtained from a C1s spectrum obtained by measurement using the X-ray photoelectron spectroscopy. Cz is an abundance (mass %) of the carbon atom obtained by measurement using a combustion-infrared absorption method.)

The invention discloses an artificial nacre material with layered structure and preparation method thereof. The preparation method includes the following steps: uniformly mixing a carbonated cementitious material and water at a water-solid ratio of 0.3 to 1.2 to obtain a carbonated cementitious material suspension; treating the carbonated cementitious material suspension by a freeze-casting process to obtain a carbonated cementitious material coagulation with layered structure; treating the carbonated cementitious material coagulation with the layered structure by a freeze-drying process to obtain a carbonated cementitious material with layered structure; treating the carbonated cementitious material with layered structure by a carbonization process to obtain an artificial nacre material with layered structure. The obtained artificial nacre material with layered structure has higher fracture toughness and durability, and the preparation method has the advantages of low energy consumption, carbon dioxide fixation and environmental friendliness.

The present disclosure is directed to using MXene compositions as templates for the deposition of oriented perovskite films, and compositions derived from such methods. Certain specific embodiments include methods preparing an oriented perovskite, perovskite-type, or perovskite-like film, the methods comprising: (a) depositing at least one perovskite, perovskite-type, or perovskite-like composition or precursor composition using chemical vapor deposition (CVD), physical vapor deposition (PVD), or atomic layer deposition (ALD) onto a film or layer of a MXene composition supported on a substrate to form a layered composition or precursor composition; and either (b) (1) heat treating or annealing the layered precursor composition to form a layered perovskite-type structure comprising at least one oriented perovskite, perovskite-type, or perovskite-like composition; or (2) annealing the layered composition; or (3) both (1) and (2).

The invention relates to an NVPF-based composition and the use thereof in the field of batteries as an electrochemically active material. The invention also relates to a conductive composition comprising said composition as well as to a method for obtaining said composition.

The present invention relates to a lithium composite metal oxide which satisfies the requirements (1) and (2) described below. Requirement (1): The ratio of the half width A of the diffraction peak within the range of 2θ=64.5±1° to the half width B of the diffraction peak within the range of 2θ=44.4±1°, namely A/B is from 1.39 to 1.75 (inclusive) in powder X-ray diffractometry using a Cu—Kα ray. Requirement (2): The ratio of the volume-based 90% cumulative particle size (D.sub.90) to the volume-based 10% cumulative particle size (D.sub.10), namely D.sub.90/D.sub.10 is 3 or more.

Provided are an atomic layer sheet that contains boron and oxygen as framework elements, is networked by nonequilibrium couplings having boron-boron bonds, and has a molar ratio of oxygen to boron (oxygen/boron) of less than 1.5, a laminated sheet containing a plurality of such atomic layer sheets and metal ions between ones of the sheets, and a thermotropic liquid crystal and a lyotropic liquid crystal containing these. In addition, there is provided a method for manufacturing an atomic layer sheet and/or a laminated sheet containing boron and oxygen, the method including: adding MBH.sub.4, where M represents an alkali metal ion, into a solvent containing an organic solvent in an inert gas atmosphere to prepare a solution; and exposing the solution to an atmosphere containing oxygen.

A compound of the general formula:

[00001]${\mathrm{Li}}_{\left(\frac{4}{3}-\frac{2x}{3}-\frac{y}{3}-\frac{z}{3}\right)}{\mathrm{Ni}}_x{\mathrm{Co}}_y{\mathrm{Al}}_z{\mathrm{Mn}}_{\left(\frac{2}{3}-\frac{K}{3}-\frac{2y}{3}-\frac{2z}{3}\right)}{O}_2$

wherein x is equal to or greater than 0 and equal to or less than 0.4; y is equal to or greater than 0.1 and equal to or less than 0.4; and z is equal to or greater than 0.02 and equal to or less than 0.3. The compound is also formulated into a positive electrode for use in an electrochemical cell.

The technology subject of the present application concerns methods and systems for manufacturing and producing stable polarized or ferroelectric layered materials.

A positive electrode active material in the form of a single particle and a lithium secondary battery containing the positive electrode active material thereof are provided. The positive electrode active material has a nickel-based lithium composite metal oxide single particle. The single particle has a plurality of crystal grains. An average particle size (D50) of the single particle is from 3.5 μm to 8 μm. The single particle includes a metal doped in the crystal lattice thereof.