Carbon quantum dot coated Mn sub(3)O sub(4) with enhanced performances for lithium-ion batteries

A C quantum dot coated Mn sub(3)O sub(4) composite (Mn sub(3)O sub(4)/C sub(do ts)) has been obtained for the first time by a green alternating voltage electrochemical approach. It is interesting to note that the morphology of Mn sub(3)O sub(4) particles in the composite can be induced to form an octahedral structure through the introduction of C quantum dots. In particular, the as-produced Mn sub(3)O sub(4)/C sub(dot s) 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 super(-1) after 50 cycles at a current density of 100 mA g super(-1) which is almost five times as much as that of pure Mn sub(3)O sub(4).