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Thin‐Film Silicon for Flexible Metal–Air Batteries
Author(s) -
Garamoun Ahmed,
Schubert Markus B.,
Werner Jürgen H.
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402463
Subject(s) - silicon , materials science , silicon carbide , electrolyte , amorphous silicon , nanotechnology , chemical engineering , optoelectronics , engineering physics , metallurgy , electrode , chemistry , crystalline silicon , engineering
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.