Publications
Detailed Information
The role of in situ generated nano-sized metal particles on the coulombic efficiency of MGeO3 (M = Cu, Fe, and Co) electrodes
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Chang H. | - |
dc.contributor.author | Jung, Yoon S. | - |
dc.contributor.author | Lee, Kyu T. | - |
dc.contributor.author | Ku, Jun H. | - |
dc.contributor.author | Oh, Seung M. | - |
dc.date.accessioned | 2009-07-30T03:09:40Z | - |
dc.date.available | 2009-07-30T03:09:40Z | - |
dc.date.issued | 2009-03-19 | - |
dc.identifier.citation | Electrochim. Acta 54 (2009) 4371 | en |
dc.identifier.issn | 0013-4686 | - |
dc.identifier.uri | https://hdl.handle.net/10371/5924 | - |
dc.description.abstract | To improve the coulombic efficiency of GeO2 electrode, a Cu-containing ternary metal oxide (CuGeO3)
was prepared and the electrochemical behavior of Cu componentwas studied. The GeO2 electrode shows a low coulombic efficiency in the first cycle (43%), which is mainly caused by a poor Ge oxidation kinetics (Ge + 2Li2O→GeO2 + 2Li+ +2e−). The X-ray absorption spectroscopy (XAS) data illustrate that the Cu component in CuGeO3 is converted to nano-sized metallic Cu in the earlier stage of lithiation but idles thereafter. In contrast, the Ge component in CuGeO3 behaves like the GeO2 electrode. It is converted to nano-sized Ge by a conversion reaction and further lithiated by alloying reaction. The de-lithiation proceeds in the reverse order. The CuGeO3 electrode shows a much improved coulombic efficiency (74%) in the first cycle, which is indebted to a facilitated Ge oxidation with a much reduced electrode polarization. This feature has been explained by the favorable roles provided by the in situ generated nano-sized metallic Cu particles that make such an intimate contact with the nano-sized Ge and Li2O that they can catalyze Li2O decomposition and provide an electronic conductive network for Ge oxidation. A similar favorable effectwas observed with the other ternary oxides (FeGeO3 and CoGeO3), wherein the formation of nano-sized metallic Fe and Co can be assumed. | en |
dc.description.sponsorship | This work was supported by WCU program through KOSEF
funded by the Ministry of Education, Science and Technology (400- 2008-0230). The authors also wish to acknowledge the Research Center for Energy Conversion and Storage for financial support, and the Pohang Light Source (PLS) for the XAS measurements. | en |
dc.language.iso | en | en |
dc.publisher | Elsevier | en |
dc.subject | Lithium ion batteries | en |
dc.subject | Anode | en |
dc.subject | Metal oxide electrodes | en |
dc.subject | Nano-sized metal particles | en |
dc.subject | Coulombic efficiency | en |
dc.title | The role of in situ generated nano-sized metal particles on the coulombic efficiency of MGeO3 (M = Cu, Fe, and Co) electrodes | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 오승모 | - |
dc.identifier.doi | 10.1016/j.electacta.2009.03.009 | - |
- Appears in Collections:
- Files in This Item:
- There are no files associated with this item.
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.