Carbon quantum dot coated Mn3O4 with enhanced performances for lithium-ion batteries

Abstract

A C quantum dot coated Mn₃O₄ composite (Mn₃O₄/C_dots) has been obtained for the first time by a green alternating voltage electrochemical approach. It is interesting to note that the morphology of Mn₃O₄ particles in the composite can be induced to form an octahedral structure through the introduction of C quantum dots. In particular, the as-produced Mn₃O₄/C_dots composite utilized as an anode material for lithium ion batteries demonstrates excellent electrochemical performances, showing an enhanced reversible discharge capacity of 934 mA h g⁻¹ after 50 cycles at a current density of 100 mA g⁻¹ which is almost five times as much as that of pure Mn₃O₄.