In Situ Synthesis of Core-Shell Li4Ti5O(12) @ Polyaniline Composites with Enhanced Rate Performance for Lithium-ion Battery Anodes

摘要

The core-shell Li_4Ti_5O_(12) @ polyaniline composites(LP) have been synthesized via an in situ synthesis with different mole ratios(25:1, 50:1 and 100:1, aniline:LTO). As an anode material of lithium-ion batteries,the LP-2 electrodes(50:1) exhibit a high initial reversible capacity of 205 mAh g^(-1)with an initial coulombic efficiency of 97.6% at 0.1 C. Even at a high current density of 10 C, the reversible capacity of the LP-2 electrodes still remains at 102 mAh g^(-1). Moreover, the LP-2 electrodes retain an impressive high capacity of 161 mAh g^(-1)after 100 cycles at 1 C, with 0.11% capacity fading per cycle. The promising electrochemical performance may be attributed to the significantly decreasing charge-transfer impedance of the LP composite and reductive polarity difference between the cathode and the electrolyte.