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

Bucher, Nicolas and Hartung, Steffen and Arkhipova, Maria and Yu, Denis and Kratzer, Philipp and Maas, Gerhard and Srinivasan, Madhavi and Hoster, Harry E. (2014) A novel ionic liquid for Li ion batteries - uniting the advantages of guanidinium and piperidinium cations. RSC Advances, 4 (4). pp. 1996-2003. ISSN 2046-2069

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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.

Item Type:
Journal Article
Journal or Publication Title:
RSC Advances
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600
Subjects:
ID Code:
72636
Deposited By:
Deposited On:
27 Jan 2015 10:28
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 09:07