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Thermoelectrochemically Activated MoO2 Powder Electrode for Lithium Secondary Batteries

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Authors
Ku, Jun H.; Jung, Yoon S.; Lee, Kyu T.; Kim, Chang H.; Oh, Seung M.
Issue Date
2009
Publisher
Electrochemical Society
Citation
J. Electrochem. Soc., 156, A688 (2009)
Abstract
The high temperature lithiation behavior of the MoO2 electrode is examined, which is lithiated by one-electron reduction (by
addition reaction) at room temperature. At elevated temperatures, this electrode is lithiated with four-electron reduction by addition
and continued conversion reaction. As a result of four-electron reduction, the initial crystalline MoO2 phase is decomposed into a
nanosized mixture of metallic Mo and Li2O, which is in turn converted to nanosized MoO2 upon forthcoming delithiation. An
interesting feature here is that as-generated nanosized MoO2 is now fully lithiated up to four-electron reduction even at room
temperature. This phenomenon is named “thermoelectrochemical activation” because the extension from one- to four-electron
reduction is achieved by a simple charge–discharge cycling made at elevated temperatures. The thermoelectrochemically activated
MoO2 electrode delivers a reversible specific capacity that is close to the theoretical four-electron capacity (838 mAh g−1) with
an excellent cycle performance at room temperature.
ISSN
0013-4651
Language
English
URI
http://hdl.handle.net/10371/5922
DOI
https://doi.org/10.1149/1.3141670
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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