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

Abstract

Abstract The layered nickel-cobalt-manganese LiNi1/3Co1/3Mn1/3O2 was investigated as commercializable and high reversible capacity cathode material by more and more investigators in recent years. In this paper, the LiNi1/3Co1/3−xMn1/3YxO2 (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 LiNi1/3Co1/3Mn1/3O2 was also studied systematically. The Y3+ 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 LiNi1/3Co1/3−0.05Mn1/3Y0.05O2 (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.