Ultrafine MoO2nanoparticles embedded in a carbon matrix as a high-capacity and long-life anode for lithium-ion batteries

Abstract

A composite of ultrafine MoO₂ nanoparticles homogeneously distributed in a carbon matrix has been fabricated on a large scale by an easy impregnation–reduction–carbonization route. Firstly, a cotton/PMA composite was formed by incorporating phosphomolybdate clusters into a cotton framework. Then it was treated in a H₂/Ar atmosphere at 500 °C for 5 h and in situ reduced/carbonized into a black monolith comprising ultrafine MoO₂ nanoparticles (<2 nm) embedded in the carbon matrix. The electrochemical tests demonstrate that the as-formed MoO₂/C hybrid exhibits high capacity and excellent capacity retention as an anode material for lithium-ion batteries. The specific discharge capacity is as high as 1207 mA h g⁻¹ in the first cycle and 734 mA h g⁻¹ over 350 cycles at a current density of 50 mA g⁻¹.