Patent ID: 9444099
Filing Date: 2016-09-13
CPC Classification: C01G,C01P,H01M,Y02E,Y02P

Claim Text:
1. A process for producing a cathode active material for a lithium ion secondary battery, comprising: contacting a lithium-containing composite oxide containing Li element and a transition metal element with a composition (1) such that particles (I) are obtained and that the particles (I) comprises the lithium-containing composite oxide and a compound containing a metal element (M) attached to the lithium-containing composite oxide; mixing the particles (I) and a compound (2) such that a mixture is formed; and heating the mixture such that particles (III) comprising the lithium-containing composite oxide and a covering layer (II) formed on a surface of the lithium-containing composite oxide are obtained and that the covering layer (II) comprises the metal element (M) and a fluorine element, wherein the composition (1) comprises a compound containing no Li element and containing the metal element (M), the metal element (M) is at least one selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pb, Cu, Zn, Al, In, Sn, Sb, Bi, La, Ce, Pr, Nd, Gd, Dy, Er and Yb dissolved or dispersed in a solvent, the compound (2) is a compound which generates HF by heating, and the mixing of the particles (I) and the compound (2) comprises mixing the particles (I) and a solid form of the compound (2).