| 초록 |
Cobalt-intercalated layered manganese oxide (CLMO) and the polyaniline-coated CLMO prepared by chemical oxidative polymerization of aniline in an acidic medium were characterized. The electrochemical performance was investigated for application as cathode electrode material for lithium ion batteries. Due to the effective pillaring effect of exchanged cobalt ions in the interlayer region, CLMO showed excellent cyclability over 40 cycles. Polyaniline-coated CLMO, in addition to its excellent cyclability, presented a much higher discharge capacity (253 mAh/g) than that of CLMO at a current density of 40 mA/g in the range of 1.5 4.0 V. These results demonstrate that intercalated cobalt ions in the interlayer region can supply sufficient structural stability during charge-discharge cycles and, furthermore, subsequent polyaniline coating on the surface of a cathode electrode can bring out surface stabilization that prevents an unwanted reaction between the electrode and electrolytes. |
