Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries
- 등재 SCIE, SCOPUS
- 발행기관 Royal Society of Chemistry
- 발행년도 2015
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000119226
- 본문언어 영어
- Published As http://dx.doi.org/10.1039/c5cp03375f
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
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 ZnMn<inf>2</inf>O<inf>4</inf> 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 ZnMn<inf>2</inf>O<inf>4</inf> at 54.7%. Furthermore, the ZnO-MnO composite exhibited improved cycling performance and enhanced rate capability compared with untreated ZnMn<inf>2</inf>O<inf>4</inf>. 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. © the Owner Societies 2015.
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