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A novel ionic liquid for Li ion batteries - uniting the advantages of guanidinium and piperidinium cations

Research output: Contribution to journalJournal articlepeer-review

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  • Nicolas Bucher
  • Steffen Hartung
  • Maria Arkhipova
  • Denis Yu
  • Philipp Kratzer
  • Gerhard Maas
  • Madhavi Srinivasan
  • Harry E. Hoster
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<mark>Journal publication date</mark>2014
<mark>Journal</mark>RSC Advances
Issue number4
Volume4
Number of pages8
Pages (from-to)1996-2003
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We report on the synthesis and the properties of N,N,N',N'-tetramethyl-N '',N ''-pentamethyleneguanidinium bis(trifluoromethylsulfonyl)imide (PipGuan-TFSI). The cation of this novel ionic liquid combines guanidinium and piperidinium structural elements. We tested it for its viscosity, ion conductivity, and also for its thermal and electrochemical stability. Furthermore, a 0.5 M solution of lithium TFSI in PipGuan-TFSI was tested as an electrolyte for Li-ion batteries. These experiments included cycles of Li deposition/dissolution on stainless steel and (de) intercalation into/from LiFePO4 electrodes. The tests involving LiFePO4 cathodes were performed at various C-rates and temperatures for a better quantitative comparison to other electrolyte systems. We discuss in how far PipGuan-TFSI successfully combines the advantages of guanidinium and piperidinium ionic liquids for battery electrolyte applications.