CoFe₂O₄@rGO as a Separator Coating for Advanced Lithium–Sulfur Batteries

Lithium–sulfur (Li–S) batteries are hindered by the undesired shuttle effect and sluggish electrochemical conversion kinetics. Herein, a well-designed CoFe2O4@reduced graphene oxide ([email protected]) composite is used to modify separator develop multifunctional polysulfide barrier. Density functional theory (DFT) calculations confirm that highly electronegative oxygen ions in CFO tend bond with transition metal (TM) at octahedral (Oh) sites, which induces formation of FeS CoS bonds between polysulfides. This indicates can effectively anchor Furthermore, low Li2S decomposition energy barrier Li+ diffusion reveal accelerate redox reaction kinetics sulfur species. Electronic structure speculate low-energy be attributed electron-hopping phenomenon TM different valence states Oh sites. Benefiting from these advantages, [email protected]/PP demonstrates satisfactory cycling performance (0.087% capacity decay rate 2C 500 cycles) superb (686 mAh g−1 5C). work provides valuable reference for future research on spinel-type materials as electrocatalysts Li–S batteries.