Cathode material and lithium ion battery

A method for preparing a cathode material, comprising:

• providing a precursor of lithium cobalt oxide;
• mixing the precursor with a compound of lithium and a compound of metal element M, and sintering the mixture in an air atmosphere at about 900-1000° C. for about 6-12 hours to form lithium cobalt oxide bulk-doped with metal element M;
• and
• mixing the lithium cobalt oxide with a compound of metal element Me, sintering the mixture in an air atmosphere at about 850-950° C. for about 6-12 hours, naturally cooling, and then annealing the mixture in an oxygen-containing atmosphere to obtain a lithium cobalt oxide cathode material surface-doped with metal element Me and having a spinel phase structure on the surface, wherein the annealing temperature is about 600-900° C., and the annealing time is about 1-8 hours,
• wherein M comprises at least one of Mg, Ti, Zr or Al, and
• wherein Me comprises at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Cu, Cr, Zn or Fe.

A method for preparing a cathode material, comprising:

• mixing a cobalt source, a lithium source, a precipitant and a salt of metal element M in an aqueous solution, and precipitating to form a precursor of lithium cobalt oxide bulk-doped with metal element M;
• sintering the precursor in an air atmosphere at about 900-1000° C. for about 6-12 hours to form lithium cobalt oxide bulk-doped with metal element M;
• and
• mixing the lithium cobalt oxide with a compound of metal element Me, sintering the mixture in an air atmosphere at about 850-950° C. for about 6-12 hours, naturally cooling the mixture, and then annealing the mixture in an oxygen-containing atmosphere to obtain a lithium cobalt oxide cathode material surface-doped with metal element Me and having a spinel phase structure on the surface, wherein the annealing temperature is about 600-900° C., and the annealing time is about 1-8 hours;
• wherein M comprises at least one of Mg, Ti, Zr or Al, and
• wherein Me comprises at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Cu, Cr, Zn or Fe.