標題: In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO2-Based Energy Storage Devices
作者: Tsai, Tsung-Chun
Huang, Guan-Min
Huang, Chun-Wei
Chen, Jui-Yuan
Yang, Chih-Chieh
Tseng, Tseung-Yuen
Wu, Wen-Wei
材料科學與工程學系
電機學院
Department of Materials Science and Engineering
College of Electrical and Computer Engineering
公開日期: 19-Sep-2017
摘要: Transition metal oxides have attracted much interest owing to their ability to provide high power density in lithium batteries; therefore, it is important to understand the electrochemical behavior and mechanism of lithiation-delithiation processes. In this study, we successfully and directly observed the structural evolution of CNTs/MnO2 during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO2 were selected due to their high surface area and capacitance effect, and the lithiation mechanism of the CNT wall expansion was systematically analyzed. Interestingly, the wall spacings of CNTs/MnO2 and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO2 layer caused structural defects on the CNTs surface that could allow penetration of Li+ and Mn4+ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO2 in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors.
URI: http://dx.doi.org/10.1021/acs.analchem.7b00958
http://hdl.handle.net/11536/146118
ISSN: 0003-2700
DOI: 10.1021/acs.analchem.7b00958
期刊: ANALYTICAL CHEMISTRY
Volume: 89
起始頁: 9671
結束頁: 9675
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