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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Thermoelectrochemically Activated MoO2 Powder Electrode for Lithium Secondary Batteries

Cited 55 times inthomson ciCited 43 times inthomson ci
Title
Thermoelectrochemically Activated MoO2 Powder Electrode for Lithium Secondary Batteries
Author
Ku, Jun H.Jung, Yoon SeokLee, Kyu TaeKim, Chang H.Oh, Seung M.
Keywords
Charge discharge cycling; Conversion reactions; Cycle performance; De-lithiation; Elevated temperature; Four-electron reduction; High temperature; Lithiation; Lithium secondary batteries; Nano-sized; One-electron reductions; Powder electrodes; Reversible specific capacity; Room temperature
Issue Date
2009
Publisher
ELECTROCHEMICAL SOC INC
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.
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DOI
10.1149/1.3141670
ISSN
0013-4651
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ECHE_Journal Papers
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