Stability Enhancement of Hard Carbon Anode Materials in Sodium-Ion Batteries through Controllable Oxygen-Doped Pitch Coating

, along with a remarkable ICE of 90.92%. After 900 cycles, the capacity retention remains high at 77%, demonstrating exceptional cycling stability. These performance enhancements are attributed to the appropriate concentration of carbonized oxygen-doped pitch (CODP) coating, which avoids direct contact between the electrolyte and ITS and introduces oxygen atoms to provide more active sites. This work not only provides a promising precursor for the fabrication of high-performance HC anodes for SIBs but also introduces an innovative synthetic strategy, injecting momentum into the commercialization process of SIBs.