Lithium-sulfur　batteries　(LSBs)　are　a　promising　candidate　for　next-generation　energy　storage　solutions.　However,　challenges　such　as　the　shuttling　effect　and　sluggish　Li-S　reaction　kinetics　of　lithium　polysulfides　hinder　their　practical　application.　In　this　work,　we　present　a　mixed-phase　heterostructure　comprising　Co0.85Se　and　MoSe2,　supported　on　nitrogen-doped　carbon　polyhedrons　(NCP),　as　an　effective　sulfur　host　in　the　LSB　cathode.　Through　a　combination　of　theoretical　calculations　and　experimental　validation,　we　demonstrate　that　the　Co0.85Se-MoSe2　heterointerface　significantly　enhances　electron　transfer　efficiency,　thereby　boosting　the　overall　reaction　kinetics　of　the　sulfur　cathode.　As　a　result,　the　Co0.85Se-MoSe2/　NCP/S　electrodes　exhibit　initial　specific　capacities　exceeding　1500　mAh　g-1　at　0.1　C　and　retain　666　mAh　g-1　at　3　C,　with　a　capacity　fade　rate　of　0.044%　per　cycle　over　500　cycles　at　1.0　C.　Notably,　even　at　a　high　sulfur　loading　of　3　mg　cm-2　and　a　reduced　electrolyte　volume　of　6.7　lL　mgS-1　,　the　Co0.85SeMoSe2/NCP/S　electrodes　maintain　a　capacity　of　432　mAh　g-1　after　100　cycles　at　0.2　C.　(c)　2025　Science　Press　and　Dalian　Institute　of　Chemical　Physics,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.　and　Science　Press.　All　rights　are　reserved,　including　those　for　text　and　data　mining,　AI　training,　and　similar　technologies.