Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.101: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Anode Materials for All Solid-State Thin-Film Batteries — •Susann Nowak, Giulio Calcagno, and Guido Schmitz — Lehrstuhl für Materialphysik, Universität Stuttgart

Promising anode materials for all solid-state lithium ion batteries are alloying materials like tin or silicon due to their safety compared to lithium metal and their high specific capacity. However they are also known for their low cycle stability due to a huge volume expansion when lithiated. Recent approaches are trying to use a thin coating of high area materials, nano-wires or patterned materials to overcome these constrains. To give a guideline for the desired thicknesses in these processes we prepared thin films of Si and Sn on different substrates which were charged and discharged by chrono-amperommetry in liquid (EC:DEC 1M LiClO4) and solid electrolyte (LiPON). The results show clearly that coatings of silicon should not exceed a thickness of 50 nm if long cycle lives are desired. Very thin layers of silicon can be charged et very high rates (over 100 C) without showing significant volume decrease or layer destruction.