Bistriflimide

Bistriflimide, systematically known as bis(trifluoromethane)sulfonimide and colloquially known as TFSI is a non-coordinating anion with the chemical formula of [(CF₃SO₂)₂N] ^-. The anion is widely used in ionic liquids, since it is less toxic and more stable than more "traditional" counterions such as tetrafluoroborate. Developing a IUPAC name for bistriflimide that indicates the structure and reactivity is challenging, and changes to current names have been proposed.cite journal
last = Wilson
first = Gregory J.
authorlink =
coauthors = Hollenkamp, Anthony F.; Pandolfo, Anthony G.
title = Resolving Ambiguous Naming for an Ionic Liquid Anion
journal = Chemistry International
volume = 29
issue = 4
publisher = IUPAC
date = July-August 2007
url = http://www.iupac.org/publications/ci/2007/2904/ud.html
accessdate = 2008-01-08 ]

This anion is also of importance in lithium-ion and lithium metal batteries because of its high dissociation and conductivity. It has the added advantage of suppressing crystallinity in poly(ethylene oxide), which increases the conductivity of that polymer below its melting point at 50C.

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