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Alkaline zinc manganese dioxide (Zn-MnO2)batteries are widely used in everyday life.Recycling of waste alkaline Zn-MnO2 batteries has always been a hot environmental conc.In this study,a simple and costeffective process for synthesizing Mn3O4/carbon nanotube (CNT) nanocomposites from recycled alkaline Zn-MnO2 batteries is presented.Manganese oxide was recovered from spent Zn-MnO2 battery cathodes.The Mn3O4/CNT nanocomposites were produced by ball milling the recovered manganese oxide in a commercial multi-wall carbon nanotubes (MWCNTs) solution.Scanning electron microscopy (SEM) analysis demonstrates that the nanocomposite has a unique three-dimensional (3D) bird nest structure.Mn3O4 nanoparticles are homogeneously distributed on MWCNT framework.Mn3O4/CNT nanocomposites were evaluated as an anode material for lithium-ion batteries,exhibiting a highly reversible specific capacitance of ～580 mAh·g-1 after 100 cycles.Moreover,Mn3O4/CNT nanocomposite also shows a fairly positive onset potential of-0.15 V and quite high oxygen reducibility when considered as an electrocatalyst for oxygen reduction reaction.