| 초록 |
The layered lithium metal oxides, LiMO2 (M=Co, Ni, Mn) and the LiMn2O4 are most widely studied 4 V class cathode materials for lithium secondary batteries with high energy density. The LiCoO has been commercialized but has still some problems, such as its high cost, moderate, and toxicity. LiNiO2 and LiMnO2 also have been extensively studied as possible alternatives to LiCoO2. In this work, the layered Li[(Ni0.5 Mn0.5)1-xCox]O2 powders have been synthesized by ultrasonic spray pyrolysis method. Li[(Ni0.5Mn0.5)1-xCox]O2 powders were characterized by means of X-ray diffraction, Rietveld refinments, charge/discharge cycling, and cyclic voltammetry. The prepared powers has a hexagonal α-NaFeO2 structure and delivered a specific discharge capacity of 170 mAh g-1 in the voltage range of 2.8 - 4.4 V. |
