Synthesis of Y-Doped LiNi1/3Co1/3-xMn1/3YxO2 spheres with improved Lithium storage

The layered nickel-cobalt-manganese LiNi 1/3 Co 1/3 Mn 1/3 O 2 was investigated as commercializable and high reversible capacity cathode material by more and more investigators in recent years. In this paper, the LiNi 1/3 Co 1/3−x Mn 1/3 Y x O 2 (x = 0, 0.02, 0.05, 0.10) samples were successfully obtained by a ball-milling combined with calcination method. The synthesized nanocomposite was characterized by different analytical methods. The effect of amount of Y ions doping on the lithium storage performance of LiNi 1/3 Co 1/3 Mn 1/3 O 2 was also studied systematically. The Y 3+ ions replace the part of Co ions, reducing cation mixing, increasing the diffusion coefficient of Li + ions in the lattice. It causes the unit cell volume to become larger, and the structure of the material becomes more stable in the intercalation and de-intercalation process of Li + ions. These results show that LiNi 1/3 Co 1/3−0.05 Mn 1/3 Y 0.05 O 2 (Y-0.05 LNCM) sample behaves best electrochemical properties with the specific capacity of 174.8 mAh g –1 at 0.5 C after 100 cycles.