| Title |
The Studies of Structural Stability of LiNi0.5Mn1.5O4 Spinel |
| Authors |
박성빈(Sung Bin Park); 김율구(Yool Koo Kim); 이완규(Wan Gyu Lee); 조원일(Won Il Cho); 장호(Ho Jang) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
capacity fading; TEM; LiNi0.5Mn1.5O4; Lithium batteries |
| Abstract |
The stability of the cathode materials for Li secondary battery is an important factor for its cyclability. The present paper focuses on the structural stability of LiNi0.5Mn1.5O4 during lithiation/delithiation of Li ions and compared to that of LiMn2O4. LiMn2O4 and LiNi0.5Mn1.5O4 powders are synthesized using a solgel method and their structural and electrochemical properties are investigated by XRD, SEM, and chargedischarge tests. LixMn2O4 and LixNi0.5Mn1.5O4(x=0.9,0.5,0.1) specimens are obtained after charge/discharge tests by controlling the cut-off voltage for XRD and TEM investigation. The charge-discharge tests shows that initial capacity of LiNi0.5Mn1.5O4 is 125 mAh/g and that of LiMn2O4 is around 100 mAh/g. The capacity of LiNi0.5Mn1.5O4 is maintained 95% of its initial capacity whereas the capacity of LiMn2O4 is maintained 65% of its initial capacity. |