LiMnPO4/LiMn2O4　(LMP/LMO)　composite　cathodes　with　LMP　coating　on　the　surface　of　LMO　were　synthesized　by　hydrothermal　method　at　180　A　degrees　C　for　10　h.　The　crystal　structures　and　microstructures　were　characterized　via　power　X-ray　diffraction　(XRD),　field　emission　scanning　electron　microscope　(FE-SEM),　and　high-resolution　transmission　electron　microscope　(HRTEM).　The　electrochemical　properties　were　characterized　by　cyclic　voltammetry　(CV)　measurement　and　charge-discharge　test.　LMP/LMO　composite　cathodes　exhibited　higher　discharge　capacity　and　better　cycle　stability　than　the　bare　LiMn2O4　cathode.　Taking　both　capacity　and　cycle　ability　into　concern,　15　wt%　LiMnPO4　that　coated　LiMn2O4　possessed　the　best　performances.　At　55　A　degrees　C,　it　delivered　an　initial　discharge　capacity　of　120.1　mAh　g(-1)　and　retained　97.1　%　of　the　initial　capacity　after　100　cycles　at　1　C　rate.