title: Thin-film silicon for flexible metal-air batteries.
abstract: Due to its high energy density, theoretical studies propose silicon as a promising candidate material for metal-air batteries. Herein, for the first time, experimental results detail the use of n-type doped amorphous silicon and silicon carbide as fuel in Si-air batteries. Thin-film silicon is particularly interesting for flexible and rolled batteries with high specific energies. Our Si-air batteries exhibit a specific capacity of 269 Ah kg(-1) and an average cell voltage of 0.85 V at a discharge current density of 7.9 μA cm(-2) , corresponding to a specific energy of 229 Wh kg(-1) . Favorably in terms of safety, low concentrated alkaline solution serves as electrolyte. Discharging of the Si-air cells continues as long as there is silicon available for oxidation.
authors.affiliation: Institut für Photovoltaik, Universität Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart (Germany), Fax: (+49) 711-685 67138.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Garamoun
authors.forename: Markus B
authors.initials: MB
authors.lastname: Schubert
authors.forename: Jürgen H
authors.initials: JH
authors.lastname: Werner
mesh_terms: D000388:Air; D008670:Metals / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*
chemical_list: D008670:Metals; D012825:Silicon
keywords: amorphous materials; batteries; electrochemistry; silicon; thin films