Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.38: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Microstructure Investigation of Lithiated Silicon — •Wenlong Zhao, Lukas Diekmeyer, Eike Epler, Burkhard Roos, Vladimir Roddatis, Cynthia A. Volkert, and Carsten Nowak — Insitute for Materials Physics, Göttingen, Germany

Because of its theoretically high gravimetric capacity, silicon receives a lot of attention as potential anode material for lithium-ion batteries. Experimentally, the expected capacity is usually not observed which is attributed to the high volume change of silicon on lithiation and the accompanying amorphization of the silicon.

In this work, we present results on the microstructure investigation of lithiated silicon. Single crystalline silicon pillars of micrometer dimension where electrochemically lithiated in an organic electrolyte. After subsequent delithiation and focused ion beam based sample preparation, the samples were characterized with high resolution transmission electron microscopy and laser assisted atom probe tomography. The observed formation of atomic scale defects on {111} and {113} planes and the formation of amorphous channels in the volume of the material are discussed.