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A carbon-free nanocomposite consisting of MoO nanoparticles embedded between MoSe nanosheets, named MoO@MoSe, has been synthesized and demonstrated excellent electrochemical properties for lithium ion batteries. In such a composite, MoSe nanosheets provide a flexible substrate for MoO nanoparticles; while MoO nanoparticles act as spacers to retain the desired active surface to electrolyte and also introduce metallic conduction. In addition, the heterojunctions at the interface between MoSe and MoO introduce a self-built electric field to promote the lithiation/delithiation process. As a result, such lamellar composite has a long cycling stability with a reversible capacity of 520.4 mA h g at a current density of 2000 mA g after 400 cycles and excellent rate performance, which are attributed to the synergistic combination of the two components in nanoscale.