화학공학소재연구정보센터
Electrochemical and Solid State Letters, Vol.11, No.8, A135-A139, 2008
Structural and electrochemical characterizations of solution derived LiMn0.5Ni0.5O2 as positive electrode for li-ion rechargeable batteries
A cost effective solution route has been developed to synthesize LiMn0.5Ni0.5O2 cathode material. X-ray diffraction pattern of the material was fitted based on a hexagonal unit cell (alpha-NaFeO2 layer structure). First discharge capacities were 142 and 158 mAh/g at room temperature and at 50 degrees C, respectively. The capacity fading was similar to 6.23% after 30 cycles at room temperature. The Raman spectroscopic and X-ray photoemission spectroscopy analysis of the pristine and electrochemically cycled material showed no significant structural change and Mn remained in the +4 oxidation state, respectively. Ni+2/Ni+3 and Ni+3/Ni+4 redox couples were involved during the electrochemical (de)intercalation of Li+1 upon electrochemical cycling.