This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1016/j.jpowsour.2016.04.084 in citations.
Please use the identifier: http://hdl.handle.net/2128/11201 in citations.
Time-of-flight secondary ion mass spectrometry study of lithium intercalation process in LiCoO$_2$ thin film
Time-of-flight secondary ion mass spectrometry study of lithium intercalation process in LiCoO$_2$ thin film
A detailed time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis of the lithium de-/intercalation in thin films of the insertion cathode material lithium cobalt oxide is presented. The LiCoO2 (LCO) thin films are deposited by radio frequency magnetron sputtering at 600 °C, having a (003...
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Personal Name(s): | Dellen, Christian (Corresponding author) |
---|---|
Gehrke, Hans-Gregor / Möller, Sören / Tsai, Chih-Long / Breuer, Uwe / Uhlenbruck, Sven / Guillon, Olivier / Finsterbusch, Martin / Bram, Martin | |
Contributing Institute: |
Analytik; ZEA-3 Plasmaphysik; IEK-4 JARA-ENERGY; JARA-ENERGY Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Journal of power sources, 321 (2016) S. 241-247 |
Imprint: |
New York, NY [u.a.]
Elsevier
2016
|
DOI: |
10.1016/j.jpowsour.2016.04.084 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Methods and Concepts for Material Development |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/11201 in citations.
A detailed time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis of the lithium de-/intercalation in thin films of the insertion cathode material lithium cobalt oxide is presented. The LiCoO2 (LCO) thin films are deposited by radio frequency magnetron sputtering at 600 °C, having a (003) preferred orientation after the deposition. The thin electrode films are cycled with liquid electrolyte against lithium metal, showing 80-86% extractable capacities. After disassembling the cells, the depth resolved elemental distribution in the LCO is investigated by ToF-SIMS and glow discharge optical emission spectroscopy. Both techniques show a stepwise lithium distribution in charged state, leading to a lithium depleted layer close to the surface. In combination with the electrochemical results, the qualitative comparison of the different lithium depth profiles yields a reversible lithium extraction in the depleted area below the stability limit for bulk materials of LCO. For bulk LCO, a phase change normally occurs when the lithium concentration in LixCoO2 is lower than x=0.5. As a possible cause for the inhibition of the phase change, the preferred orientation and thus pinning of the crystal structure of the film by the substrate is proposed. |