The data presented in this data article are related to the research article entitled “Facile Synthetic Strategy to Uniform Cu 9 S 5 Embedded into Carbon: A Novel Anode for Sodium-Ion Batteries” (Jing et al., 2018) [1]. The related experiment details of pure Cu 9 S 5 has been stated. The structure data of pure Cu 9 S 5 and the electrochemical performance for sodium-ion batteries are described.