TY - JOUR
T1 - Study of the Formation of a Solid Electrolyte Interphase (SEI) on a Silicon Nanowire Anode in Liquid Disiloxane Electrolyte with Nitrile End Groups for Lithium-Ion Batteries
AU - Horowitz, Yonatan
AU - Ben-Barak, Ido
AU - Schneier, Dan
AU - Goor-Dar, Meital
AU - Kasnatscheew, Johannes
AU - Meister, Paul
AU - Grünebaum, Mariano
AU - Wiemhöfer, Hans Dieter
AU - Winter, Martin
AU - Golodnitsky, Diana
AU - Peled, Emanuel
N1 - Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/3/1
Y1 - 2019/3/1
N2 - The chemical compatibility of the various compounds and elements used in lithium-based batteries dictates their safe operation parameters and performance. The lithium salt Li-bis(trifluoromethanesulfonyl)imide (LiTFSI) has many advantages over the common LiPF6 salt as it does not react with water impurities to form, for example, hydrofluoric acid. To further accommodate safe-operation chemistry, we use a non-volatile disiloxane-based solvent 1,3-bis(cyanopropyl)tetramethyldisiloxane (TmdSx-CN). This is a liquid disiloxane functionalized with terminal nitrile groups. In this paper, we report on the electrochemical characterization and the composition of the solid electrolyte interphase (SEI) of 1 mol kg−1 LiTFSI dissolved in TmdSx-CN in silicon-lithium batteries. Specifically, we study the SEI formation on silicon nanowire anodes and its composition by several ex-situ surface techniques (XPS, SEM), and in-situ via polarization modulation infrared reflectance absorption spectroscopy (PM-IRRAS). We evaluate the potential application of TmdSx-CN to silicon-lithium batteries and conclude that the addition of fluoroethylene carbonate (FEC) at low concentrations (10 wt %) is essential to the formation of an effective SEI. We anticipate that our study will encourage the investigation, design and use of siloxane-based solvents as safer alternatives to common solvents used in Li-ion batteries, and specifically as candidate solvents in Li-metal and silicon-anode based batteries.
AB - The chemical compatibility of the various compounds and elements used in lithium-based batteries dictates their safe operation parameters and performance. The lithium salt Li-bis(trifluoromethanesulfonyl)imide (LiTFSI) has many advantages over the common LiPF6 salt as it does not react with water impurities to form, for example, hydrofluoric acid. To further accommodate safe-operation chemistry, we use a non-volatile disiloxane-based solvent 1,3-bis(cyanopropyl)tetramethyldisiloxane (TmdSx-CN). This is a liquid disiloxane functionalized with terminal nitrile groups. In this paper, we report on the electrochemical characterization and the composition of the solid electrolyte interphase (SEI) of 1 mol kg−1 LiTFSI dissolved in TmdSx-CN in silicon-lithium batteries. Specifically, we study the SEI formation on silicon nanowire anodes and its composition by several ex-situ surface techniques (XPS, SEM), and in-situ via polarization modulation infrared reflectance absorption spectroscopy (PM-IRRAS). We evaluate the potential application of TmdSx-CN to silicon-lithium batteries and conclude that the addition of fluoroethylene carbonate (FEC) at low concentrations (10 wt %) is essential to the formation of an effective SEI. We anticipate that our study will encourage the investigation, design and use of siloxane-based solvents as safer alternatives to common solvents used in Li-ion batteries, and specifically as candidate solvents in Li-metal and silicon-anode based batteries.
KW - batteries
KW - disiloxanes
KW - electrolytes
KW - lithium
KW - silicon
UR - http://www.scopus.com/inward/record.url?scp=85063632256&partnerID=8YFLogxK
U2 - 10.1002/batt.201800123
DO - 10.1002/batt.201800123
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AN - SCOPUS:85063632256
SN - 2566-6223
VL - 2
SP - 213
EP - 222
JO - Batteries and Supercaps
JF - Batteries and Supercaps
IS - 3
ER -