Influence of Mn content on the morphology and improved electrochemical properties of Mn3O4|MnO@carbon nanofiber as anode material for lithium batteries

► Composites MnOx/carbon synthesized through thermal stabilization and carbonization. ► Phase composition, morphology and capacity affected by Mn concentration in precursor. ► Mn33_3h with the lowest manganese content presents the best electrochemical properties. ► Discharge capacity of Mn33_3h at the 50th cycle remains 99.7% of that at the 2nd cycle. ► Composite structure of MnOx/carbon is efficient to improve capacity and cycleability.