Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries

Title
Enhanced electrochemical performance of a ZnO-MnO composite as an anode material for lithium ion batteries
Authors
Min Seob SongSahn Nahm조원일Chongmok Lee
Keywords
lithium ion battery; rate capability; anode material; ZnO-MnO composite; in-situ HT XRD; cycle performance
Issue Date
2015-10
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 17, 23496-23502
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 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
URI
http://pubs.kist.re.kr/handle/201004/50423
ISSN
14639076
Appears in Collections:
KIST Publication > Article
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