Mesoporous MoO2-carbon nanocomposites synthesized by triconstituent co-assembly approach for high performance lithium-ion batteries

Abstract

Molybdenum oxide (MoO2) has been considered as a promising anode material in lithium-ion batteries with high theoretical capacity (838 mAh/g); regrettably, the drawback of rapid capacity decay seriously hinders its application. In this work, MoO2 nanoparticles were in situ encapsulated inside the frameworks of porous carbon to construct MoO2-carbon nanocomposites by a facile triconstituent co-assembly approach. The obtained MoO2-carbon nanocomposites present stable structures and exhibit improved electrochemical performances of high reversible capacity (803 mAh/g at 0.1 A/g) and excellent cycling stability (572 mAh/g at 1 A/g after 400 cycles) as anode materials for lithium-ion batteries. These satisfactory results are mainly attributed to the synergy effects between the MoO2 nanoparticles and carbon frameworks, specifically a better accommodation of volume change and a shorter pathway for ion transmission.