Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 18, Pages 6153-6156Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.01.011
Keywords
Ionic liquid; FSI; Si anode; Composite anode; Li-ion battery; Cycle life
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An ionic liquid electrolyte containing bis(fluorosulfonyl)imide (FSI) anion without any solvent is applied to a silicon-nickel-carbon (Si-Ni-carbon) composite anode for rechargeable lithium (Li)-ion batteries. The FSI-based ionic liquid electrolyte successfully provides a stable, reversible capacity for the Si-Ni-carbon anode, which is comparable to the performance observed in a typical commercialized solvent-based electrolyte, while a common ionic liquid electrolyte containing bis(trifluoromethanesulfonyl)imide (TFSI) anion without FSI presents no reversible capacity to the anode at all. Ac impedance analysis reveals that the FSI-based electrolyte provides very low interfacial and charge-transfer resistances at the Si-based composite anode, even when compared to the corresponding resistances observed in a typical solvent-based electrolyte. Galvanostatic cycling of the Si-based composite anode in the FSI-based electrolyte with a charge limitation of 800 mAh g(-1) is stable and provides a discharge capacity of 790 mAh g(-1) at the 50th cycle, corresponding to a cycle efficiency of 98.8%. (C) 2010 Elsevier B.V. All rights reserved.
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