| 主权项 |
1. A cathode active material for lithium secondary batteries, comprising:
a core formed by aggregation of a plurality of lithium metal oxide primary particles; a first shell formed by coating the surface of the core with a plurality of barium titanate particles and a plurality of metal oxide particles; and a second shell formed by coating the surface of the first shell with a plurality of olivine-type lithium iron phosphate particles and a plurality of conductive material particles, wherein the metal oxide particles have such an average particle size that the metal oxide particles are disposed in the gap between the barium titanate particles, and the metal oxide particles fill the gap between the barium titanate particles, wherein the second shell is coated on the surface of the first shell in the form of a film, wherein the lithium metal oxide primary particles of the core is any one selected from the group consisting of LiCoO2, Li(NiaCobAlc)O2 (0<a<1, 0<b<1, 0<c<1, a+b+c=1), Li(NiaCobMnc)O2 (0<a<1, 0<b<1, 0<c<1, a+b+c=1), Li(LixNiaCobMnc)O2 (0<x<0.5, 0<a<1, 0<b<1, 0<c<1, a+b+c=1) and LiMn2O4, or mixtures thereof, wherein the metal oxide particles of the first shell is any one selected from the group consisting of titanium oxide, yttrium oxide, magnesium oxide, zinc oxide and lithium metal oxide, or mixtures thereof, wherein the conductive material particles of the second shell is any one selected from the group consisting of conductive polymers and conductive carbon, or mixtures thereof. |
