Iron　fluoride　(FeF3　and　FeF2)　is　a　potential　candidate　for　the　next　generation　of　lithium-ion　battery　(LIBs)　cathode　materials　due　to　their　high　theoretical　specific　capacity　and　low　cost.　However,　previous　studies　have　reported　that　the　poor　conductivity　of　FeF3　and　FeF2　prevents　their　theoretical　specific　capacity　from　being　effectively　realized.　Herein,　fluorinated　graphene　loaded　FeFx　(FeFx@FG)　submicron　sphere　was　synthesized　using　graphene　oxide　and　utilized　as　cathode　materials　for　LIBs.　Characterization　by　X-ray　diffraction　and　transmission　electron　microscopy　confirmed　that　the　synthesized　FeFx　(x　=　2　and　3)　contains　mixed　FeF3　and　FeF2crystals.　The　mixed　crystal　structure　enables　the　FeFx@FG　submicron　sphere　composite　to　display　two　steps　in　the　electrochemical　reaction　when　FeF3　and　FeF2　discharge　cooperatively,　leading　to　excellent　discharge　performance.　In　addition,　since　the　FG　prepared　by　acid　thermal　method　has　good　conductivity,　it　can　significantly　improve　the　FeFx　conductivity　and　specific　capacity　when　being　connected　to　FG　via　C-F　bond.　The　electrochemical　tests　show　that　the　initial　discharge　capacity　of　FeFx@FG　is　as　high　as　394.24　mAh/g　at　the　rate　of　0.2C　in　the　range　of　1.5–4.0　V　at　25　°C　and　display　an　excellent　discharge　capacity　retention　rate　after　the　first　discharge　process,　showing　great　potential　of　the　mixed　crystalline　iron　fluoride　cathode　in　the　field　of　lithium-ion　batteries.　©　2024　Elsevier　B.V.