Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries
- Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries
- Min Seob Song; Sahn Nahm; 조원일; Chongmok Lee
- lithium ion battery; rate capability; anode material; ZnO-MnO composite; in-situ HT XRD; cycle performance
- Issue Date
- Physical chemistry chemical physics : PCCP
- VOL 17, 23496-23502
- 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 hightemperature XRD analysis was performed under vacuum conditions. The results indicated that ZnMn2O4 transformed into the ZnO–MnO composite phase starting from 500 1C and that this composite structure was retained until 700 1C. 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
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