A lithium metal composite oxide having a layered structure, containing at least Li, Ni, and an element X, in which the element X is one or more elements selected from the group consisting of Co, Mn, Mg, Ca, Sr, Ba, Zn, B, Al, Ga, Ti, Zr, Ge, Fe, Cu, Cr, V, W, Mo, Sc, Y, Nb, La, Ta, Tc, Ru, Rh, Pd, Ag, Cd, In, and Sn, L/D.sub.50 that is a ratio of an average primary particle diameter L to a 50% cumulative volume particle size D.sub.50 is 0.3 to 1.5, and, in powder X-ray diffraction measurement using a CuKα ray, a crystallite diameter A calculated from a diffraction peak within a range of 2θ=44.5±1° is 700 Å or less.

A sulfide solid electrolyte to be used in a lithium-ion secondary battery, including: a crystal phase; and an anion existing in a crystal structure of the crystal phase, in which the crystal phase includes an argyrodite crystal containing Li, P, S, and Ha; Ha is at least one element selected from the group consisting of F, Cl, Br, and I; the anion includes an oxide anion having a Q0 structure having an M-O bond that is a bond of M and O; and M is at least one element selected from the group consisting of metal elements and semimetal elements belonging to Groups 2 to 14 of a periodic table.

A negative electrode including a negative electrode active material layer including a negative electrode active material including a negative electrode active material particle. The negative electrode active material particle includes a silicon compound particle including a silicon compound (SiOx: 0.5≤x≤1.6). The silicon compound particle includes crystalline Li2SiO3 in at least part of the silicon compound particle. Among a peak intensity A derived from Li2SiO3, a peak intensity B derived from Si, a peak intensity C derived from Li2Si2O5, and a peak intensity D derived from SiO2 which are obtained from a 29Si-MAS-NMR spectrum of the silicon compound particle, the peak intensity A is the highest intensity, and the peak intensity A and the peak intensity C satisfy a relationship of the following formula 1:
Formula 1: 3C<A.

A positive electrode active material or non-aqueous electrolyte secondary batteries comprises a Co-containing lithium transition metal oxide containing Ni, Mn, and an arbitrary element and having a layered structure, wherein the content ratio of Ni in the lithium transition metal oxide is 75 to 95 mol %, the content ratio of Mn in the lithium transition metal oxide is equal to or greater than the content ratio of Co in the lithium transition metal oxide, the content ratio of Co in the lithium transition metal oxide is 0 to 2 mol %, the content ratio of a metal element other than Li in an Li layer in the layered structure is 1 to 2.5 mol %, and, in the lithium transition metal oxide, the half width n of a diffraction peak for (208) plane of an X-ray diffraction pattern as measured by X-ray diffraction is as follows: 0.30°≤n≤0.50°.

Provided in the present disclosure are a lithium-rich manganese-based positive electrode material for use in a lithium-ion battery, a preparation method for the material, a positive electrode tab, the lithium-ion battery, and an electric vehicle. The lithium-rich manganese-based positive electrode material provides increased structural stability in a charging-discharging cycle, is not prone to experiencing an expansion or contraction that causes grain boundary stress imbalance, is not prone to undergoing a side reaction with an electrolytic solution, and is easy to industrialize; moreover, the lithium-ion battery made with the material provides great cycle performance, great rate performance, and great commercial prospect.

An active material is provided for use in a solid-state battery. The active material exhibits at least one peak in the range of 0.145 to 0.185 nm and at least one peak in the range of 0.280 to 0.310 nm in a radial distribution function obtained through measurement of an X-ray absorption fine structure thereof. In the particle size distribution, by volume, of the active material obtained through a particle size distribution measurement by laser diffraction scattering method, the ratio of the absolute value of the difference between the mode diameter of the active material and the D.sub.10 of the active material (referred to as the “mode diameter” and the “D.sub.10” respectively) to the mode diameter in percentage terms, (|mode diameter - D.sub.10 / mode diameter) x 100, satisfies 0% < (( | mode diameter - D.sub.10| / mode diameter) x 100) ≤ 58.0%.

A method of preparing iron oxide nanoparticles using an herbal mixture comprising Capparis spinosa, Cichorium intybus, Solanum nigrum, Cassia occidentalis, Terminalia arjuna, Achillea millefolium, and Tamarix gallica. The method produces crystalline γ-Fe.sub.2O.sub.3 nanoparticles which are superparamagnetic. The iron oxide nanoparticles are used in a method of killing or inhibiting the growth of a bacteria and/or fungus, particularly in the form of a biofilm. The nanoparticles are also used in a method of treating colon cancer.

The present invention relates to inorganic fibres having a composition comprising: 61.0 to 70.8 wt % SiO.sub.2; 28.0 to 39.0 wt % CaO; 0.10 to 0.85 wt % MgO other components, if any, providing the balance up to 100 wt %,

The sum of SiO.sub.2 and CaO is greater than or equal to 98.8 wt % and the other components comprise less than 0.70 wt % Al.sub.2O.sub.3, if any.

This particle contains at least one titanium compound crystal grain, and satisfies requirements 1 and 2. Requirement 1: |dA(T)/dT| of the titanium compound crystal grain satisfies 10 ppm/° C. or more at at least one temperature T1 in a range of −200° C. to 1200° C. A is (a-axis (shorter axis) lattice constant of the titanium compound crystal grain)/(c-axis (longer axis) lattice constant of the titanium compound crystal grain), and each of the lattice constants is obtained by X-ray diffractometry of the titanium compound crystal grain. Requirement 2: the particle contains a pore, and in a cross section of the particle, the pore has an average equivalent circle diameter of 0.8 μm or more and 30 μm or less, and the titanium compound crystal grain has an average equivalent circle diameter of 1 μm or more and 70 μm or less.

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.