Simon Jakobi


Investigation on the effect of differently orientated p- and n-type Si-wafers on the efficiency of Si-air-batteries using an ionic liquid for electrolyte

Low cry<stallographic index planes of silicon Copyright: S. Jakobi

The development of new battery systems is facing the increasing digitization of society and electromobility one of the major research areas. Possessing the 2nd most abundant element on the Earth’s crust as an anode electrode and having a high theoretical energy density, Si-air batteries are good candidates to play an important role in the battery market. However, as shown in the previous studies, these types of batteries suffer from the high chemical dissolution of Si when aqueous electrolytes are employed.[1,2] The Utilization of an ionic liquid e.g. 1-ethyl-3-methylimidazolium fluorohydrogenate [EMIm (HF)2.3F] promises a reduction of this reaction and therefore an enhancement on efficiency. The aim of this master thesis is to investigate the influence of differently orientated Si-wafers on battery performance with EMIm (HF)2.3F. As anode electrodes, p- and n-type Si-wafers with the crystallographic index planes (100), (110) and (111) are of interest. Electrochemical characterizations of the silicon samples will be carried out by galvanostatic discharge experiments and also by linear polarization technique.

[1] X. Zhong, H. Zhang, Y. Liu, J. Bai, Y. Huang, X. Duan, ChemSusChem 2012, 5, 177 – 188.
[2] O. J. Glembocki, E. D. Palik, G. R. De Guel, D. L. Kendall, J. Electrochem. Soc. 1991, 138, 1055 – 1063.