Methods and systems for dry surface doping of cathode materials

A doped cathode material, comprising:

• a core region, the core region being composed of lithium nickel manganese cobalt oxide;
• and
• a doped surface region, the doped surface region being composed of lithium nickel manganese cobalt oxide and a metal dopant and formed from metal dopant precursor particles,
• wherein the metal dopant is a metal ion having an ionic radius of greater than about 0.50 Å, and wherein the metal dopant precursor particle is comprised of one or more compounds selected from neodymium oxides, neodymium acetates, neodymium nitrides, neodymium sulfates, neodymium fluoride, neodymium nitrate, neodymium phosphide, neodymium sulfide, neodymium iodide, neodymium phosphate, neodymium carbonate, neodymium oxalate, neodymium acetylacetonate, and combinations thereof.

A doped cathode material, comprising:

• lithium nickel manganese cobalt oxide;
• and
• a dopant comprising B and Nd, wherein the dopant is uniformly doped within a surface region of the lithium nickel manganese cobalt oxide in a dry surface doping process, wherein dopant precursor particles are sized complimentary to openings within a surface region of the lithium nickel manganese cobalt oxide, and
• wherein a dopant precursor is not present in the doped surface region, and wherein the dopant precursor comprises one or more compounds selected from neodymium oxides, neodymium acetates, neodymium nitrides, neodymium sulfates, neodymium fluoride, neodymium nitrate, neodymium phosphide, neodymium sulfide, neodymium iodide, neodymium phosphate, neodymium carbonate, neodymium oxalate, neodymium acetylacetonate, and combinations thereof, and the doped surface region includes lithium nickel manganese cobalt oxide and the dopant.