title: Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries.
abstract: A ZnO-MnO composite was synthesized using a simple solvothermal method combined with a high-temperature treatment. To observe the phase change during the heating process, in situ high-temperature XRD analysis was performed under vacuum conditions. The results indicated that ZnMn2O4 transformed into the ZnO-MnO composite phase starting from 500 °C and that this composite structure was retained until 700 °C. The electrochemical performances of the ZnO-MnO composite electrode were evaluated through galvanostatic discharge-charge tests and cyclic voltammetry analysis. Its initial coulombic efficiency was significantly improved to 68.3% compared to that of ZnMn2O4 at 54.7%. Furthermore, the ZnO-MnO composite exhibited improved cycling performance and enhanced rate capability compared with untreated ZnMn2O4. To clarify the discharge-charge mechanism of the ZnO-MnO composite electrode, the structural changes during the charge and discharge processes were also investigated using ex situ XRD and TEM.
authors: Center for Energy Convergence Research, Korea Institute of Science and Technology, Seoul, 136-791, Korea. wonic@kist.re.kr.
authors: Min Seob
authors: MS
authors: Song
authors: Sahn
authors: S
authors: Nahm
authors: Won Il
authors: WI
authors: Cho
authors: Chongmok
authors: C
authors: Lee