TY  - JOUR
AU  - Guhl, Conrad
AU  - Kehne, Philipp
AU  - Ma, Qianli
AU  - Tietz, Frank
AU  - Alff, Lambert
AU  - Komissinskiy, Philipp
AU  - Jaegermann, Wolfram
AU  - Hausbrand, René
TI  - In-operando photoelectron spectroscopy for batteries: Set-up using pristine thin film cathode and first results on Na x CoO 2
JO  - Review of scientific instruments
VL  - 89
IS  - 7
SN  - 1089-7623
CY  - [S.l.]
PB  - American Institute of Physics
M1  - FZJ-2018-06872
SP  - 073104
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:30068114
UR  - <Go to ISI:>//WOS:000440590200004
DO  - DOI:10.1063/1.5022616
UR  - https://juser.fz-juelich.de/record/857918
ER  -