Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Focus Session (with TT): Functional semiconductor nanowires II
HL 13.10: Talk
Monday, March 16, 2015, 18:00–18:15, EW 201
Heterogenous Assembly of Silicon Nanowires for Battery Applications — •Andreas Krause1,2, Matthias Grube1, Jan Brückner3, Susanne Dörfler3, Ulrike Langklotz4, Tony Jaumann5, Florian M. Wisser6, Thomas Mikolajick1,2,7, and Walter M. Weber1,2 — 1Namlab gGmbh, 01187 Dresden — 2Center for Advancing Electronics Dresden (CfAED), TU Dresden — 3Fraunhofer Institute for Material and Beam Technology (IWS), 01277 Dresden — 4Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), 01277 Dresden — 5Chemistry of Functional Materials (IKM), Leibniz Institute for Solid State and Materials Research (IFW), Dresden — 6Department for Inorganic Chemistry I, Dresden University of Technology, Germany — 7Chair of Nanoelectronic Materials, Institute of Semiconductor and Microsystems Technology, TU Dresden
Silicon is a promising anode material for Lithium storage due to its high theoretical specific capacity surpassing 4200 Ah/kg, but with a large volume expansion of 400 per cent. We show innovative anode assemblies composed of a forest of free standing Si nanowires conformally integrated on a carbon fiber network. The morphology of Si nanowires allows a volume expansion and compression lowering strain incorporation. TEM micrographs of samples before and after cycling in a battery stack show the morphology change of the incorporated nanowires. A detailed electrochemical analysis is done on various samples and shows an increased stability of Si with a remaining effective capacitance above 2000 Ah/kg(Si) after 225 full charge/discharge cycles.