This article reported the electrochemical performance of a microspheres carbon/MnO2 (CMS/MnO2 )
composite prepared by an inGsituselfGlimitingdeposition methodunderhydrothermalcondition.The morpholoG
giesandstructuresoftheprepared materialswerecharacterizedbyscanelectron microscopy (SEM),transmisG
sionelectron microscopy (TEM),XGraydifraction (XRD)andthermogravimetricanalysis (TGA),andthe
electrochemicalbehaviorsweretestedby meansofcyclicvoltammetry (CV),chargeGdischargetestsandelectroG
chemicalimpedancespectroscopy (EIS),respectively.Theresultsrevealthat MnO2 homogeneouslygrow onto
thesurfaceofCMStoformahydrangeaGlikemicrostructure.MnO2 hasatypicalKGBirnesiteGtypecrystalstrucG
tureandthecontentofMnO2inthecompositeis62wt% andaspecificcapacitanceof266F/gwasobtained.
Upontheprolongedsynthetictime,thespecificcapacitanceofresultantCMS/MnO2 materialsincreasedand
thenlevelsof,because MnO2 nanoshetscoatedandgrownonthesurfaceofCMSstepbystep.