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Vol.46, No.3, 174 ~ 182, 2008
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| Title |
| The Studies of Structural Stability of LiNi0.5Mn1.5O4 Spinel |
| 박성빈 Sung Bin Park , 김율구 Yool Koo Kim , 이완규 Wan Gyu Lee , 조원일 Won Il Cho , 장호 Ho Jang |
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| 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. |
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| Key Words |
| capacity fading, TEM, LiNi0.5Mn1.5O4, Lithium batteries |
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