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Amorphous silicon thin films as a high capacity anodes for Li-ion batteries in ionic liquid electrolytes

Institution:	1. ZSW, Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Helmholtzstr. 8, D-89081 Ulm, Germany;2. HIU, Helmholtz-Institut Ulm, Helmholtzstr. 11, D-89081 Ulm, Germany;1. Center for Energy Convergence, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Material Science & Engineering, Korea University, Seoul 136-713, Republic of Korea;1. Department of Chemical Engineering, School of Engineering, Nazarbayev University, 53 Kabanbay Batyr Ave., 010000, Astana, Kazakhstan;2. National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Ave., 010000, Astana, Kazakhstan;3. Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak Ave., Yuseong-gu, Daejeon, 34134, South Korea;4. Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom;5. Institute of Batteries, 53 Kabanbay Batyr Ave., 010000, Astana, Kazakhstan;1. French Commissary of Atomic and Alternative Energies (CEA), Laboratory of Innovation for New Energy Technologies and Nanomaterials (LITEN), 17 rue des Martyrs, 38054 Grenoble Cedex 9, France;2. Umicore Research, Watertorenstraat 33, B-2250 Olen, Belgium;3. EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;4. ICMMO-ERIEE (UMR CNRS 8182), University Paris Sud, 15 avenue G. Clemenceau F-91405 Orsay, France

Abstract:	High lithiation capacity at low red-ox potentials in combination with good safety characteristics makes amorphous Si as a very promising anode material for rechargeable Li batteries.Thin film silicon electrodes were prepared by DC magnetron sputtering of silicon on stainless steel substrates. Their behavior as Li insertion/extraction electrodes was studied by voltammetry and chronopotentiometry at room temperature in the ionic liquid (IL) 1-methyl-1-propylpiperidinium bis(trifluoromethylsuphonil)imide containing 1 M Li bis(trifluoromethylsuphonil)imide. Li/Si cells containing this electrolyte showed good performance with a stable Si electrodes capacity of about 3000 mA h g^?1 and a relatively low irreversible capacity. Preliminary results on cycling Si–LiCoO₂ cells using this IL electrolyte are also presented.

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