| 초록 |
Nickel-rich layered metal oxide materials are prospective cathode materials for lithium ion batteries due to the relatively higher capacity and lower cost than LiCoO2. In this work, spherical Ni0.8Co0.1Mn0.1(OH)2 precursors are successfully synthesized by co-precipitation method. The homogeneous and spherical Ni0.8Co0.1Mn0.1(OH)2 precursors had a high tap-density of 1.91 g/cm3. LiNi0.8Co0.1Mn0.1O2 was then prepared as a cathode material for lithium-ion battery from this precursor by reaction with 5% excess LiOH.H2O at 800oC in air. The cathode material had well-ordered layer-structure and tap-density of 2.35 g/cm3. The crystal structure, morphology and electrochemical properties of the Ni0.8 Co0.1 Mn0.1 (OH)2 precursors and LiNi0.8Co0.1Mn0.1O2 were investigated by using X–ray diffraction, scanning electron microscopy, charge–discharge test and cyclic voltammetry method. In the voltage ranges of 3.0 – 4.3V, the initial discharge capacity of LiNi0.8Co0.1Mn0.1O2 at 0.1 C rate was 193 mAh g−1. The cell delivers a capacity of 170.373 mAh g-1 at 1st cycle and 153.71 mAh g-1 at 100th cycle with 90.41 % of capacity retention at 1C discharge. |
