| 초록 |
A noteworthy material, MoO2, is receiving discernable attention as anode material for Li-ion battery because of its outstanding electrochemical performances and extensive properties compare to the well-known graphite. Herein we present another strategy to inhibit volume expansion during (de)lithiation and increase its stability by preparing MoO2/Mo2C/rGO nanocomposite through supercritical methanol route followed by carbothermal annealing under H2 condition. The superior cyclability is attributed to hierarchical MoO2 nanoparticles which are embedded on rGO sheets providing a large surface area and shorten diffusion path for Li+ insertion. Carbothermal reaction between Mo species and reactive carbon atoms from rGO will form Mo2C which is electrochemically inactive, but offers high electrical conductivity and enhanced thermal stability. The as-prepared MoO2/Mo2C/rGO composite delivers higher reversible capacity of 895.5 mAh g-1 than pristine MoO2 with 729.2 mAh g-1 at 50 mA g-1 and excellent high-rate capability of 380 mAh g-1 and 200 mAh g-1 at 500 mA g-1 and 2500 mA g-1, respectively. |
