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In-operando photoelectron spectroscopy for batteries: Set-up using pristine thin film cathode and first results on NaxCoO2

Guhl, Conrad and Kehne, Philipp and Ma, Qianli and Tietz, Frank and Alff, Lambert and Komissinskiy, Philipp and Jaegermann, Wolfram and Hausbrand, René (2018):
In-operando photoelectron spectroscopy for batteries: Set-up using pristine thin film cathode and first results on NaxCoO2.
In: Review of Scientific Instruments, AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA, pp. 073104, 89, (7), ISSN 0034-6748, DOI: 10.1063/1.5022616, [Online-Edition: https://doi.org/10.1063/1.5022616],
[Article]

Abstract

A model all-solid-state battery cell with a thin film NaxCoO2 cathode was assembled under ultra-high vacuum conditions and cycled inside the vacuum chamber, using a dedicated sample holder. We present in-operando x-ray photoelectron spectroscopy measurements of a NaxCoO2 cathode at different charging states. During battery operation, the change in sodium content, the change in cobalt oxidation state, and the evolution of the O1s and VB emissions could be monitored. Comparison with a conventional post-mortem analysis technique showed that the new measurement technique produces comparable results regarding the oxidation state of the transition metal, but sodium and oxygen results show differences due to cathode/electrolyte interfacial reactions for conventional analysis. By using surface layer-free samples in the presented techniques, we could circumvent such reactions and obtain reliable spectra for the pure bulk-like active cathode material.

Item Type: Article
Erschienen: 2018
Creators: Guhl, Conrad and Kehne, Philipp and Ma, Qianli and Tietz, Frank and Alff, Lambert and Komissinskiy, Philipp and Jaegermann, Wolfram and Hausbrand, René
Title: In-operando photoelectron spectroscopy for batteries: Set-up using pristine thin film cathode and first results on NaxCoO2
Language: English
Abstract:

A model all-solid-state battery cell with a thin film NaxCoO2 cathode was assembled under ultra-high vacuum conditions and cycled inside the vacuum chamber, using a dedicated sample holder. We present in-operando x-ray photoelectron spectroscopy measurements of a NaxCoO2 cathode at different charging states. During battery operation, the change in sodium content, the change in cobalt oxidation state, and the evolution of the O1s and VB emissions could be monitored. Comparison with a conventional post-mortem analysis technique showed that the new measurement technique produces comparable results regarding the oxidation state of the transition metal, but sodium and oxygen results show differences due to cathode/electrolyte interfacial reactions for conventional analysis. By using surface layer-free samples in the presented techniques, we could circumvent such reactions and obtain reliable spectra for the pure bulk-like active cathode material.

Journal or Publication Title: Review of Scientific Instruments
Volume: 89
Number: 7
Publisher: AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
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
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 03 Sep 2018 11:23
DOI: 10.1063/1.5022616
Official URL: https://doi.org/10.1063/1.5022616
Funders: This research project was funded by the DFG (Nos. HA 6128/2-1 and KO 4093/2-1)., Additionally, the authors would like to thank BMBF (No. 03KP801) for funding the UHV system DAISY-BAT.
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