Enhanced electrochemical performances of MoO2 nanoparticles composited with carbon nanotubes for lithium-ion battery anodes

摘要

The nanocomposites of carbon nanotubes (CNTs) with homogenously anchored molybdenum dioxide (MoO2) nanoparticles of 20-50 nm have been successfully synthesized by a hydrothermal method. Glucose has dual functions, i.e., reducing agent and surfactant to prohibit the anisotropic growth, resulting in the direct deposition of MoO2 nanoparticles on the CNT surfaces. As the anode of lithium-ion batteries (LIBs), the as-prepared MoO2/CNT nanocomposites deliver a higher reversible capacity of 640 mA h g(-1) at a current density of 100 mA g(-1) after 100 cycles, compared to only 246 and 259 mA h g(-1) for MoO3 nanobelts/CNT composites and MoO2 nanoparticles, respectively. The superior electrochemical performances are attributed to the nanocomposite structure of MoO2 nanoparticles anchored on CNTs, which have efficiently enhanced the electrical conductivity and lithium ion diffusion, and maintained the integrity of electrode during the charge/discharge processes.