Cherkashinin, Gennady ; Ensling, David ; Komissinskiy, Philipp ; Hausbrand, René ; Jaegermann, Wolfram (2013):
Temperature induced reduction of the trivalent Ni ions in LiMO2 (M=Ni, Co) thin films.
In: Surface Science, 608, pp. L1-L4. Elsevier Science Publishing, ISSN 00396028,
[Article]
Abstract
We report on an in-situ photoelectron spectroscopy study of the LiMO2 (M = Ni,Co) thin film layered materials. In the stoichiometric Lix(NiCo)O2 films grown by RF-magnetron sputtering at 20–600 °C, Ni3+ ions exist in the low-spin state. The growth temperatures T > 650 °C lead to better crystallinity of the films, Li-deficiency, and reduction of Ni3+ to Ni2+ in the high-spin state. The Co3+ ions in the low spin state are stable at 400–670 °C. The missing electron at the Ni-site is compensated by a less negative charge at the oxygen site or by the oxygen deficiency in Lix(NiCo)O2.
| Item Type: | Article |
|---|---|
| Erschienen: | 2013 |
| Creators: | Cherkashinin, Gennady ; Ensling, David ; Komissinskiy, Philipp ; Hausbrand, René ; Jaegermann, Wolfram |
| Title: | Temperature induced reduction of the trivalent Ni ions in LiMO2 (M=Ni, Co) thin films |
| Language: | English |
| Abstract: | We report on an in-situ photoelectron spectroscopy study of the LiMO2 (M = Ni,Co) thin film layered materials. In the stoichiometric Lix(NiCo)O2 films grown by RF-magnetron sputtering at 20–600 °C, Ni3+ ions exist in the low-spin state. The growth temperatures T > 650 °C lead to better crystallinity of the films, Li-deficiency, and reduction of Ni3+ to Ni2+ in the high-spin state. The Co3+ ions in the low spin state are stable at 400–670 °C. The missing electron at the Ni-site is compensated by a less negative charge at the oxygen site or by the oxygen deficiency in Lix(NiCo)O2. |
| Journal or Publication Title: | Surface Science |
| Volume of the journal: | 608 |
| Publisher: | Elsevier Science Publishing |
| Uncontrolled Keywords: | X-ray photoelectron spectroscopy, Li- ion transition metal oxides, Thin films, Valence and spin states of Ni and Co ions |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology 11 Department of Materials and Earth Sciences > Material Science > Surface Science Zentrale Einrichtungen Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI) DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A3: Boundary layers and thin films of ionic conductors: Electronic structure, electrochemical potentials, defect formation and degradation mechanisms Exzellenzinitiative DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres DFG-Collaborative Research Centres (incl. Transregio) Exzellenzinitiative > Clusters of Excellence |
| Date Deposited: | 09 Jan 2014 08:35 |
| URL / URN: | http://dx.doi.org/10.1016/j.susc.2012.09.023 |
| Additional Information: | SFB 595 A3 |
| Identification Number: | doi:10.1016/j.susc.2012.09.023 |
| PPN: | |
| Funders: | The work is supported by Deutsche Forschungsgemeinschaft (German Research Foundation) in the frame of the Research Collaborative Centre SFB 595 “Electrical Fatigue in Functional Materials”. |
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