Self-Supported Lithium Titanium Oxide Nanosheet Arrays Decorated with Molybdenum Disulfide for High-Performance Lithium-Ion Batteries

摘要

Hierarchical nanocomposites of lithium titanium oxide (Li4Ti5O12; LTO) nanosheet arrays decorated with molybdenum disulfide (MoS2) were synthesized by a hydrothermal approach. Compared to LTO, the as-synthesized composites showed much improved capacity (433 mAhg(-1) after 70 cycles at various current densities), good rate capability (320 mAhg(-1) and 210 mAhg(-1) at 500 mAg(-1) and 2000 mAg(-1), respectively), outstanding cycle stability (174 mAhg(-1) after 1000 cycles at 5000 mAg(-1)), and a wide operating temperature range, extending from -15 to 55 degrees C when used as anode materials for lithium-ion batteries. The excellent performance of the MoS2@LTO composites could be attributed to the improved conductivity and unique hierarchical structure that provides a high contact surface area and reduced diffusion paths for both ion and electron transport. The results give clear evidence of the usefulness of MoS2 when improving the electrochemical properties of LTO electrodes, promising advanced batteries with high capacity and long cycle life.