A gradient doped cobalt-free positive electrode material and a preparation method therefor, a lithium-ion battery positive electrode, and a lithium battery. The positive electrode material consists of LiNi.sub.xMn.sub.yA.sub.zO.sub.2. The content of element A in the positive electrode material decreases in a direction from a surface layer of the positive electrode material to the center, and A is one or more of Al, Zr, Ti, B, and W. The preparation method is easy to implement, simplifies roasting condition requirements, and provides a cobalt-free positive electrode material having good cycle performance.

A cobalt-free positive electrode material and a preparation method therefor, a lithium ion battery positive electrode, and a lithium ion battery, relating to the technical field of lithium ion batteries. The positive electrode material comprises a core and a shell covering the core, the core being a cobalt-free positive electrode material, the chemical formula of the core being LiNi.sub.xMn.sub.yO.sub.2, wherein 0.55≤x≤0.95 and 0.05≤y≤0.45, and the shell is a coating agent and carbon. The present method can improve the dispersibility of the cobalt-free positive electrode material during the coating process, and can also improve the conductivity of the cobalt-free positive electrode material.

The present invention relates to a lithium metal composite oxide powder having a layered structure, and comprising at least Li, Ni, and an element X, wherein: said element X is at least one element selected from the group consisting of Co, Mn, Fe, Cu, Ti. Mg, Al, W, Mo, Nb, Zn, Sn, Zr, Ga, V, B, Si, S, and P; and the lithium metal composite oxide powder satisfies requirements (1), (2), and (3): (1) an angle of difference (θ1- θ2) calculated from an angle of repose (θ1) and an angle of fall (θ2) is 15° or less, wherein the angle of repose (θ1) is an angle of slope of the lithium metal composite oxide powder piled on a measurement table, and the angle of fall (θ2) is an angle of slope measured after application of a predetermined impact force to the measurement table; (2) an average primary particle diameter is 1 .Math.m or more; and (3) an amount of water contained in the lithium metal composite oxide powder is 1000 ppm or less.

The present invention provides a fine silicon powder and the like including fine silicon particles having a microscopically measured particle diameter of 1 μm or more and an average circularity determined in accordance with Formula (1) of 0.93 or more, in which an average particle diameter based on volume, which is measured by a laser diffraction scattering method, is in a range of 0.8 μm or more and 8.0 μm or less, an average particle diameter based on number, which is measured by the laser diffraction scattering method, is in a range of 0.100 μm or more and 0.150 μm or less, and a specific surface area, which is measured by a BET method, is in a range of 4.0 m.sup.2/g or more and 10 m.sup.2/g or less. Circularity=(4×π×projected area of particle).sup.1/2/peripheral length of particle (1).

The present invention relates to a novel method for preparing lithium oxide. In the present invention, the particle size and shape of lithium oxide may be controlled during the preparing process. In addition, the present invention relates to lithium oxide with controlled particle size and shape prepared by this preparing method.

The present invention provides a nitric-oxide containing composite in the form of microparticles, wherein said microparticles comprise: (i) a core which comprises silica; (ii) a layer on said core which comprises a metal-organic framework; and (iii) nitric oxide;
wherein said metal-organic framework comprises organic ligands comprising at least one amine group, said metal-organic framework is uniformly distributed on the surface of said silica core and said nitric oxide is chemisorbed within said metal-organic framework.

A solid electrolyte material according to the present disclosure is represented by the following composition formula (1), Li.sub.aAl.sub.bO.sub.cX.sub.d . . . Formula (1) where values a, b, c, and d are each greater than 0, and X is at least one selected from the group consisting of CI and Br. A battery according to the present disclosure includes a positive electrode, a negative electrode and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer includes the solid electrolyte material according to the present disclosure.

The solid electrolyte material of the present disclosure is made of Li, Ca, Y, Gd, X, and O, where X is at least one selected from the group consisting of F, Cl, Br, and I; and the molar ratio of O to the sum of Y and Gd is greater than O and 0.51 or less.

A SiC based sinterable powder mixture comprising, by dried weight of said powder: a) a mineral content comprising—silicon carbide (SiC) particles, —mineral boron compound particles, the powder comprising at least 50% by weight of SiC and the total mineral content of the powder being at least 90% by weight, b) at least a water insoluble carbon-containing source, in particular a carbon containing resin, the powder comprising at least 1% by weight, and preferably less than 10% by weight, of said water insoluble carbon-containing source, wherein the average particle size of said sinterable powder is comprised between 0.5 to 2.0 micrometers.

Provided in the present disclosure are a positive electrode material used for a lithium ion battery. The positive electrode material comprises substrate particles, a first cladding layer that covers the substrate particles, and a second cladding layer that covers the first cladding layer; the substrate particles contain LiNi.sub.xMn.sub.y Co.sub.zM.sub.1-x-y-zO.sub.2; the first cladding layer contains lithium cobalt oxide; and the second cladding layer contains an oxide of a transition metal.