A　facile　topochemical　route　has　been　developed　to　synthesize　porous　LiMn2O4　spheres　by　using　molten　LiOH　and　porous　Mn2O3　spheres　as　a　precursor.　The　formation　of　porous　LiMn2O4　spheres　was　inherited　from　porous　Mn2O3　spheres　which　were　obtained　from　the　thermal　decomposition　of　the　MnCO3　precursors　and　the　presence　of　pores　was　confirmed　by　transmission　electron　microscope　(TEM)　and　field　emission　scanning　electron　microscope　(FESEM).　When　applied　as　cathode　materials　for　rechargeable　lithium-ion　batteries,　it　shows　good　capacity　retention　after　cycling.　Taking　the　excellent　electrochemical　performance　and　facile　synthesis　into　consideration,　the　presented　porous　LiMn2O4　spheres　could　be　a　competitive　candidate　cathode　material　for　high-performance　lithium-ion　batteries.