Ultrasonic Synthesis of α-MoO₃ Nanobelt@CNTs Composite for Lithium Battery and its Electrochemical Performances

摘要

α-MoO3 nanobelt@CNTs composite is synthesized from α-MoO3 nanobelt and multi-walled carbon nanotubes (CNTs) via ultrasonic mixing process. XRD and SEM measurement prove the layer structure and nano-belt morphology of the product. Although α-MoO3 nanobelt@CNTs composite delivers less initial discharge capacity than pure α-MoO3 nanobelt, cycling performance is improved due to the introduction of CNTs into composite. Microscopic mechanism of Li+ transportation through α-MoO3 nanobelt@CNTs composite electrode is revealed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Nyquist plots of α-MoO3 nanobelts@CNTs composite electrode vs. polarization potentials in the first discharge process shows that during Li+ intercalates into α-MoO3 nanobelts@CNTs composite electrode, SEI-film resistance (RSEI), electronic transmission resistance (Re), and charge transfer resistance (Rct) play an important role in different periods (2.9-2.0 V, 2.0-1.5 V and 1.4-1.2 V), respectively.