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Stability and performance of heterogeneous anode assemblies of silicon nanowires on carbon meshes for lithium-sulfur battery applications

 
: Krause, Andreas; Brückner, Jan; Dörfler, Susanne; Wisser, Florian M.; Althues, Holger; Grube, Matthias; Martin, Jan; Grothe, Julia; Mikolajick, Thomas; Weber, Walter Michael

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Koblmüller, G. ; Materials Research Society -MRS-:
Semiconductor nanowires - growth, physics, devices and applications : November 30 - December 5, 2014, Boston, Massachusetts, USA; Symposium LL: Semiconductor Nanowires - Growth, Physics, Devices and Applications; held at the 2014 MRS fall meeting
Red Hook, NY: Curran, 2015 (Materials Research Society Symposium Proceedings 1751)
ISBN: 978-1-5108-0627-6 (ISBN)
S.19-24
Materials Research Society (Fall Meeting) <2014, Boston/Mass.>
Symposium LL "Semiconductor Nanowires - Growth, Physics, Devices and Applications" <2014, Boston/Mass.>
Bundesministerium für Bildung und Forschung BMBF
03X4637A
Englisch
Konferenzbeitrag
Fraunhofer IWS ()
Anodes; carbon fibers; electric batteries; lithium sulfur batteries; silicon nanowires

Abstract
Si is a promising anode material for Li storage due to its high theoretical specific capacity surpassing 4200 Ah/kg. Si based anodes exhibit an extreme instability upon electrochemical incorporation of Li given the accompanied large volume expansion of about 400%. We show innovative anode assemblies composed of a forest of free standing Si nanowires conformally integrated on carbon meshes. The morphology of silicon nanowires allows a volume expansion and compression lowering strain incorporation. In this paper, we demonstrate the utilization of SiNW grown on top of a current collector made of a carbon fiber network. This leads to an increase of stability of Si with a remaining effective capacitance above 2000 Ah/kg(Si) after 225 full charge/discharge cycles. This is significantly better compared to previous results shown in literature. The anodes are fabricated by a simple and inexpensive method promising for a transfer into industrial integration.

: http://publica.fraunhofer.de/dokumente/N-358636.html