Electrochemical Investigations on Arylsilicon and Aryltin Hydrides and Their Resulting Polymers

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
J. Biedermann, C. Zeppek, A. Torvisco Gomez, I. Hanzu (Graz University of Technology), and F. Uhlig (Graz, University of Technology)
Silicon and tin are interesting candidates for anode materials in Lithium ion batteries as they have some of the highest theoretical specific capacities (4200 mAh g-1 for silicon and 991 mAh g-1for tin).[1] This advantage is counteracted by a major volume expansion with subsequent contraction during lithiation and delithiation. This expansion is causing the electrode to pulverize, lose electrical contact and thus leading to a quick fade in capacity. Pulverization may be avoided when nanoparticles or nano-sized polymers are used as they are small enough to allow “active material breathing” and thus to evade a breakdown of the electrode.[2]

Organosilicon and organotin hydrides have been studied as precursors in the formation of nano-sized polymeric materials which consist of a backbone of covalently bonded metal atoms.[3] These materials feature an increased degree of electron delocalization and may therefore be interesting for the use in charge-transfer devices and Li-ion batteries.[4] We focused on the synthesis, characterization and possible application of differently substituted arylsilicon and aryltin hydrides and their respective nanoparticles and nano-sized polymers.[5]

Moreover we synthesized aryl-substituted silicon and tin hydrides of the types R3EH, R2EH2 and REH3 (R = phenyl, 1-naphthyl; E = Si, Sn) as precursor materials and characterized them using cyclic voltammetry. The precursors were then pyrolysed or polymerized, respectively, and the resulting nanoparticles were incorporated within anodes of Li-ion batteries.

Herein we report first electrochemical characterization of differently aryl-substituted silicon and tin hydrides using cyclic voltammetry methods. Additionally, these precursor materials as well as their respective nanoparticles were tested as anode materials in Li-ion half-cells.


[1] a) C.K. Chan et al., Nat. Nanotechnol., 2008, 3, 31-35. b) B. Veeraraghavan, A. et al., J. Electrochem. Soc., 2002, 6, A675-A681.
[2] X. Xiao et al., Adv. Funct. Mater., 2015, 25, 1426-1433.
[3] a) F. Choffat, P. Smith, W. Caseri, J. Mater. Chem., 2005, 15, 1789-1792. b) K. Schittelkopf, R.C. Fischer, S. Meyer, P. Wilfling, F. Uhlig, Appl. Organomet. Chem., 2010, 24, 897-901.
[4] a) S. Adams, M. Dräger, Main Group Met. Chem., 1988, 11(3), 151-180. b) F. Choffat, P. Smith, W. Caseri, Adv. Mater, 2008, 20, 2225-2229.
[5] a) C. Zeppek, Dissertation, 2015, University of Technology Graz. b) C. Zeppek, et al., J. Organomet. Chem., 2013, 740, 41-49. c) C. Zeppek, et al. in preparation.