A　superstructural　nanocomposite　of　Mo2N　quantum　dots@MoO3@nitrogen-doped　carbon　is　synthesized　to　overcome　the　disadvantages　of　poor　cycling　stability　and　low　ionic/electronic　conductivity　of　the　MoO3　anode　in　lithium-ion　batteries.　In　this　novel　nanocomposite,　Mo2N,　which　is　calculated　to　demonstrate　metallic　character　by　density　functional　theory,　together　with　the　nitrogen-doped　carbon　nanosheets　provides　dual　enhancement　in　improving　the　structural　stability　and　kinetics　at　the　same　time.　Consequently,　an　optimized　Mo2N　quantum　dots@MoO3@nitrogen-doped　carbon　nanocomposite　exhibits　outstanding　electrochemical　performance,　including　a　large　reversible　capacity　of　960　mAh　g-1　at　100　mA　g-1　after　100　cycles,　and　high　rate　performance　as　well　as　excellent　long-term　cycling　stability　over　700　and　500　cycles　at　1　and　10　A　g-1,　respectively.　©　2019　American　Chemical　Society.