The　novel　composite　Li2MnO3　(LMO)/reduced　graphene　oxide　(rGO)　has　been　synthesized　successfully.　Based　on　the　scanning　electron　microscopy　and　transmission　electron　microscopy,　LMO　is　found　to　distribute　separately　on　the　rGO　sheets　by　forming　a　laminated　structure,　which　is　in　favor　of　good　electrical　contact　between　the　cathode　active　materials　and　the　rGO　matrix,　and　also　facilitates　the　separation　of　LMO　secondary　particles　with　reduced　size.　Cyclic　voltammetry　and　electrochemical　impedance　spectroscopy　tests　show　that　the　charge　transfer　resistance　decreases　from　81.2　Omega)　for　LMO　to　29.6　Omega　for　LMO/rGO　composite.　The　Li-ion　diffusion　coefficient　of　LMO/rGO　composite　is　almost　triple　that　of　LMO.　As　a　result,　the　LMO/rGO　composite　delivers　an　initial　discharge　capacity　of　284.9　mAh　g(-1)with　a　capacity　retention　of　86.6%　after　45　cycles　at　0.1　C　between　2.0　and　4.6　V.　Cycle　performance　is　even　better　at　a　higher　current　density　0.2　C　while　the　retention　ratio　is　up　to　97.1%　after　45　cycles.　The　rate　capability　is　also　significantly　enhanced,　and　the　LMO/rGO　composite　could　exhibit　a　large　discharge　capacity　of　123.7　mAh　g(-1)　which　is　more　than　three　times　larger　than　that　of　LMO　(40.8　mAh　g(-1))　at　a　high　rate　of　8　C.　(C)　2017　Elsevier　B.V.　All　rights　reserved.