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Subproject 6: Kinetics of Li intercalation and de-intercalation in tantalum chalcogenide single crystals

Supervisor:Horn, Behrens, Binnewies, Schmidt
Bild Subproject 6: Kinetics of Li intercalation and de-intercalation in tantalum chalcogenide single crystals

Chemical intercalation will be performed by surrounding single crystals with a solution of n-buthyl lithium in hexane or heptane. For electrochemical intercalation experiments the set up will be modified using lithium metal as a second electrode and anhydrous lithium compounds as electrolytes. Depending on applied voltage lithium will be either inserted or removed from the crystals. After the experiments lithium profiles will be measured using laser ablation combined with mass spectrometry. Diffusion perpendicular to the layers will be studied using SIMS (secondary ion mass spectrometry). Distribution of lithium within layers can be observed using ToF -SIMS (time of flight – secondary ion mass spectrometry). Chemical intercalation under hydrostatic pressure will be studied in gas pressure vessels after sealing of the sample assemblage in gold capsules. Both chemical and electrochemical intercalation will be studied under axial pressures of several kbars up to several tenths of kbar in a new cell developed.

Fig.: Schematic illustration of the fundamental steps during lithium intercalation (Taken from [3].)

Employees: A. Shabestari, M. Sc.; F. Kiesel, M. Sc.

Publications:

[1] B. Ruprecht, J. Heine, M. Wilkening, S. Indris, J. Wontcheu, W. Bensch, T. Bredow, and P. Heitjans, Diff. Fundamentals 12 (2010) 106.
[2] M. M. Islam, and T. Bredow, Z. Phys. Chem. 226 (2012) 449. 
[3] N. Schwarzburger, R. Knobel, H. Behrens, M. Binnewies, I. Horn, A. Pelster, H. F. Arlinghaus, L. Dörrer, and H. Schmidt, Z. Phys. Chem. 226 (2012) 461.

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