Carbon quantum dot coated Mn3O4 with enhanced performances for lithium-ion batteriesElectronic supplementary information (ESI) available. See DOI: 10.1039/c5ta03610k

A C quantum dot coated Mn 3 O 4 composite (Mn 3 O 4 /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 Mn 3 O 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 3 O 4 /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 Mn 3 O 4 . A C quantum dot coated Mn 3 O 4 composite (Mn 3 O 4 /C dots ) has been obtained for the first time by a green alternating voltage electrochemical approach.