Lithium　ion　batteries　play　an　important　role　in　various　energy　storage　technologies　due　to　their　good　safety　performance.　As　an　anode　material,　silicon　has　attracted　attention　for　its　higher　theoretical　capacity　than　commercial　graphite.　But　large　volume　expansion　and　unstable　solid　electrolyte　interface　(SEI)　during　the　cycling　of　silicon　lead　to　rapid　capacity　decay,　which　limits　the　commercial　application　of　silicon　anode.　In　this　article,　Si/BiPO4　anode　materials　were　prepared　by　solvothermal　reaction.　After　morphology　analysis　and　constant　current　charge　discharge　cycle　analysis　of　Si/BiPO4　anode　materials　with　different　mass　ratios,　it　was　found　that　Si/BiPO4　anode　materials　with　the　mass　ratio　of　7:3　exhibited　more　excellent　electrochemical　performance.　The　conversion　reaction　of　BiPO4　and　Li　generates　Bi　and　Li3PO4,　and　the　alloying　reaction　of　Bi　generates　Li3Bi.　Bi　and　Li3Bi　reduce　the　internal　resistance　of　the　Si/BiPO4　composite,　and　Li3PO4　is　distributed　on　the　surface　of　Si　material,　participating　in　the　formation　of　SEI　film　and　improving　the　stability　of　the　material.　At　a　current　density　of　500　mA　g−1,　the　first　discharge　specific　capacity　of　the　Si/BiPO4　anode　is　2672.1　mA　h　g−1.　After　200　cycles,　the　discharge　specific　capacity　remains　at　1308.9　mA　h　g−1.　The　electrochemical　impedances　of　pure　Si　and　Si/BiPO4　anode　materials　before　and　after　cycling　were　analyzed.　It　was　found　that　the　resistance　of　the　Si/BiPO4　anode　before　and　after　100　cycles　was　lower　than　that　of　pure　Si　materials,　which　further　proved　that　the　addition　of　BiPO4　material　helps　to　improve　the　charge　transfer　ability　of　pure　silicon　materials.　©　2024　Elsevier　Ltd　and　Techna　Group　S.r.l.