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Issue 4, 2014
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A novel ionic liquid for Li ion batteries – uniting the advantages of guanidinium and piperidinium cations

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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.

Graphical abstract: A novel ionic liquid for Li ion batteries – uniting the advantages of guanidinium and piperidinium cations

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Article information


Submitted
31 Jul 2013
Accepted
05 Nov 2013
First published
06 Nov 2013

RSC Adv., 2014,4, 1996-2003
Article type
Paper

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

N. Bucher, S. Hartung, M. Arkhipova, D. Yu, P. Kratzer, G. Maas, M. Srinivasan and H. E. Hoster, RSC Adv., 2014, 4, 1996
DOI: 10.1039/C3RA46118A

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