In Situ TEM Investigation of the Electrochemical Behavior in CNTs/MnO 2 -Based Energy Storage Devices

Tsung Chun Tsai, Guan Min Huang, Chun Wei Huang, Jui Yuan Chen, Chih Chieh Yang, Tseung-Yuen Tseng, Wen-Wei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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/MnO 2 during the lithiation process using transmission electron microscopy (TEM). CNTs/MnO 2 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/MnO 2 and CNTs were obviously expanded by 10.92% and 2.59%, respectively. The MnO 2 layer caused structural defects on the CNTs surface that could allow penetration of Li + and Mn 4+ through the tube wall and hence improve the ionic transportation speed. This study provided direct evidence for understanding the role of CNTs/MnO 2 in the lithiation process used in lithium ion batteries and also offers potential benefits for applications and development of supercapacitors.

Original languageEnglish
Pages (from-to)9671-9675
Number of pages5
JournalAnalytical Chemistry
Volume89
Issue number18
DOIs
StatePublished - 19 Sep 2017

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