Our　density　functional　theory　calculations　reveal　that　CrX3　(X　=　Cl,　Br,　I)　is　ferromagnetic,　exhibiting　remarkable　stability,　electrical　conductivity,　and　mechanical　properties.　Notably,　CrX3　monolayer　exhibit　low　diffusion　barriers　when　employed　as　anode　materials　for　lithium,　sodium,　and　potassium　ion　batteries.　Specifically,　the　diffusion　barriers　in　CrX3　monolayer　range　from　0.145　to　0.216　eV　for　lithium-ion,　0.185–0.199　eV　for　Na-ion,　and　0.067　eV　for　K-ion.　Furthermore,　CrCl₃　as　an　anode　material　for　sodium-ion　batteries,　has　a　theoretical　specific　capacity　of　up　to　1420　mAh/g,　significantly　exceeding　that　of　hard　carbon　materials　widely　used　in　sodium-ion　batteries,　which　usually　have　a　specific　capacity　of　only　between　300　and　400　mAh/g.　These　findings　suggest　that　CrX3　monolayer　hold　significant　potential　as　ideal　replacements　for　metal-ion　battery　anodes.　©　2024　Elsevier　Ltd