Synthesis and Electronic/ionic Transport Properties of MoO 2 /rGO Anode for Lithium Ion Batteries

MoO 2 /rGO (reduced graphite oxide) composites have been synthesized by hydrothermal method followed by anneal and characterized by X‐ray diffraction (XRD) and scanning electron microscope (SEM). Galvanostatic charge/discharge testing and electrochemical impedance spectroscopy (EIS) techniques are employed to evaluate the kinetic behaviors of the MoO 2 /rGO during lithiation/delithiation. The obtained MoO 2 ‐based materials have monoclinic crystal structure, and worm like shape with average dimensions of 100‐200 nm width and 500 nm‐1 μm length. There are two steps of lithium ion intercalation/de‐intercalation for the MoO 2 /rGO anode at the potential ranging from 1.0 to 3.5 V, locating at E Li/Li + = 1.60/1.75 V, 1.25/1.40 V, and the first discharge and charge capacities are, respectively, 221.0 and 185.4 mAh g −1 . The resistances of R SEI and R CT for the MoO 2 /rGO anode are 2‐4 Ω and below 5 Ω. Moreover, the lithium diffusion coefficient calculated from the EIS measurement is about 3.6×10 −9 cm 2 s −1 .