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정윤석

Jung, Yoon Seok
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Thermoelectrochemically Activated MoO2 Powder Electrode for Lithium Secondary Batteries

Author(s)
Ku, Jun H.Jung, Yoon SeokLee, Kyu TaeKim, Chang H.Oh, Seung M.
Issued Date
2009
DOI
10.1149/1.3141670
URI
https://scholarworks.unist.ac.kr/handle/201301/6724
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67650639264
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.156, no.8, pp.A688 - A693
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.
Publisher
ELECTROCHEMICAL SOC INC
ISSN
0013-4651

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