S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Thermoelectrochemically Activated MoO2 Powder Electrode for Lithium Secondary Batteries
- Ku, Jun H.; Jung, Yoon S.; Lee, Kyu T.; Kim, Chang H.; Oh, Seung M.
- Issue Date
- Electrochemical Society
- J. Electrochem. Soc., 156, A688 (2009)
- 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.
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