In　the　field　of　lithium　battery　research,　silicon　has　received　extensive　attention　due　to　its　high　specific　capacity　and　abundant　reserves,　but　the　factors　such　as　large　volume　expansion　and　low　electrical　conductivity　limit　its　further　development.　In　this　work,　Si/Bi2S3　composites　with　a　heterogeneous　structure　is　obtained　by　using　a　hydrothermal　reaction.　The　heterogeneous　structure　can　promote　the　rapid　transfer　of　charge,　and　the　interfacial　coupling　effect　of　the　heterogeneous　structure　has　an　adsorption　effect　on　Li2S　generated　by　the　conversion　reaction　of　Bi2S3,　and　Li2S　is　distributed　on　the　surface　of　the　Si/Bi2S3　composite　to　become　an　effective　component　of　solid　electrolyte　interface　(SEI),　promoting　the　stability　of　the　SEI　film.　The　Bi　and　LixBi　(x　=　1,　3)　produced　during　the　conversion　and　alloying　reactions　of　Bi2S3　can　reduce　the　internal　resistance　of　the　Si/Bi2S3　composite.　Thus,　at　a　current　density　of　500　mA　g−1,　the　initial　charge-discharge　specific　capacity　of　Si/Bi2S3　is　2240.5/2767.8　mAh　g−1.　After　200　cycles,　the　discharge　specific　capacity　can　achieve　1443.3　mAh　g−1,　with　a　capacity　retention　of　52.1　%.　©　2024　Elsevier　Ltd