The present invention provides a powdered ferrite having high dispersibility in a resin and high electromagnetic shielding characteristics. The powdered ferrite comprises platy ferrite particles having a spinel crystal structure. The powdered ferrite comprises at least 50 number % platy ferrite particles each having at least one protrusion on a surface of the particle, and the protrusion has a shape selected from the group consisting of a rectangular pyramid, a truncated rectangular pyramid, an elongated rectangular pyramid, and combinations thereof.

A stabilized lithium ion cathode material comprising a calcined manganese oxide powder wherein the manganese on a surface is MnPO.sub.4, comprises an manganese phosphate bond, or the phosphate is bonded to the surface of the cathode material.

A positive electrode active material according to the present disclosure includes a lithium composite oxide that contains at least one element selected from the group consisting of F, Cl, N, and S, and at least one element selected from the group consisting of Bi, La, Ce, Ga, Sr, Y, and Sn. Mathematical formula 0.05≤integrated intensity ratio I.sub.(18°-20°)/I.sub.(43°-46°)≤0.90 is satisfied. The integrated intensity ratio I.sub.(18°-20°)/I.sub.(43°-46°) is a ratio of an integrated intensity I.sub.(18°-20°) to an integrated intensity I.sub.(43°-46°). The integrated intensity I.sub.(A°-B°)is an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the lithium composite oxide.

The invention relates to a lithium positive electrode active material for a high voltage secondary battery, where the cathode is fully or partially operated above 4.4 V vs. Li/Li+. The lithium positive electrode active material comprises at least 95 wt % spinel having a chemical composition of Li.sub.xNi.sub.yMn.sub.2-y-zD.sub.zO.sub.4, wherein 0.9≤x≤1.1, 0.4≤y≤0.5, 0.02≤z≤0.2, wherein D is a dopant chosen between the following elements: Co, Cu, Ti, Zn, Mg, Fe or combinations thereof. The lithium positive electrode active material is a powder composed of secondary particles formed by primary particles, wherein said lithium positive electrode active material has a tap density of at least 1.9 g/cm.sup.3. The invention also relates to process for preparing the lithium positive electrode active material of the invention and a secondary battery comprising the lithium positive electrode active material of the invention.

A positive electrode active material includes a lithium composite oxide having a crystal structure belonging to the space group Fd-3m and has an integrated intensity ratio I.sub.(18°-20°)/I.sub.(43°-46°) of greater than or equal to 0.05 and less than or equal to 0.90 and an integrated intensity ratio I.sub.(63°-65°)/I.sub.(17°-19°) of greater than or equal to 0.8 and less than or equal to 2.0. The integrated intensity ratio I.sub.(18°-20°)/I.sub.(43°-46°) is a ratio of an integrated intensity I.sub.(18°-20°) to an integrated intensity I.sub.(43°-46°). The integrated intensity ratio I.sub.(63°-65°)/I.sub.(17°-19°) is a ratio of an integrated intensity I.sub.(63°-65°) to an integrated intensity I.sub.(17°-19°). The integrated intensity I.sub.(A°-B°) is an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the positive electrode active material.

A ceramic material, a component, and a method for producing a component are disclosed. In an embodiment a ceramic material includes a structure based on a system selected from the group consisting of NiCoMnO, NiMnO and CoMnO, and at least one dopant selected from lanthanides, wherein the ceramic material has a negative temperature coefficient of an electrical resistance.

The present invention relates to a positive electrode active material for a rechargeable lithium battery and a rechargeable lithium battery including same, wherein the positive electrode active material comprises a core and a surface layer formed on the surface of the core, the core comprising a first crystalline structure, the surface layer comprising a first crystalline structure and a second crystalline structure different from the first crystalline structure, the first crystalline structure being present more than the second crystalline structure in the surface layer.

Provided are electrochemical cells that include as a cathode active material within the cathode of the cell secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by grain boundaries between adjacent crystallites of the plurality of crystallites and comprising a second composition having a layered -NaFeO.sub.2-type structure, a cubic structure, a spinel structure, or a combination thereof, wherein the electrochemically active cathode active material has an initial discharge capacity of 180 mAh/g or greater; and wherein the electrochemical cell has an impedance growth at 4.2V less than 50% for greater than 100 cycles at 45 C.

A positive active material for a rechargeable lithium battery includes a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, the second compound having a smaller particle size than that of the first compound, wherein cation mixing in the surface portion of the positive active material is less than or equal to about 7.5%, cation mixing in the bulk of the positive active material is less than or equal to about 3%, a residual lithium content on the surface of the positive active material is less than or equal to about 3,000 ppm, and the first compound and the second compound each independently include 90 at % to about 98 at % of Ni with respect to the metals excluding Li.

Li.sub.a1Ni.sub.x1Co.sub.y1M.sup.1.sub.1x1y1O.sub.2,Chemical Formula 1

Li.sub.a2Ni.sub.x2Co.sub.y2M.sup.2.sub.1x2y2O.sub.2.Chemical Formula 2

When spinel-type lithiated cobalt oxide is employed for a cathode active material for a lithium ion battery, a sufficient discharge capacity is not always obtained. Thus, spinel-type lithiated cobalt oxide is doped with at least chromium, and specifically, a cathode active material for a lithium ion battery includes a spinel-type crystal phase including lithium, cobalt, chromium and oxygen, and the cathode active material has a composition represented by LiCo.sub.xCr.sub.yM.sub.zO.sub.2 where M is at least one selected from Al and Mn, and 0.85x<1, 0<y0.15, 0z, and 0.85<x+y+z1.2.