Graphene-coated mesoporous Co3O4 fibers as an efficient anode material for Li-ion batteries

Abstract

The graphene-coating porous cobalt oxide fibers (Co ₃O ₄@G) were synthesized using coordination polymers as precursors through calcination and subsequent self-assembly process. The obtained materials exhibit good electrochemical performances.

Abstract

Herein, we have designed graphene-coated porous cobalt oxide fibers (Co ₃O ₄@G) using coordination polymers as precursors through calcination followed by a subsequent self-assembly process. The graphene-coated porous cobalt oxide fiber nanostructures not only provide good conductivity, but also prevent the aggregation and volume change of the Co ₃O ₄ nanoparticles during lithium storage processes. When serving as anode materials in the lithium-ion batteries, the obtained Co ₃O ₄@G composites, exhibit remarkable electrochemical performances, including high specific capacity (∼1303.9 mA h g ⁻¹ at a current density of 0.2 A g ⁻¹), excellent cycling stability (1153 mA h g ⁻¹ retention after 80 cycles at a current density of 0.2 A g ⁻¹) and high rate capability.