“Ionic liquids-in-salt” – a promising electrolyte concept for high-temperature lithium batteries?

Maciej Marczewski*, Bernhard Stanje, Ilie Hanzu, Martin Wilkening, Patrik Johansson*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

A novel electrolyte concept for lithium-ion batteries, termed “ionic liquid-in-salt”, is introduced. Our feasibility study on (1 − x)EMIMTFSI:(x)LiTFSI, 0.66 ≤ x ≤ 0.97, showed that at elevated temperatures the various dual liquid and solid phase regions are characterized by a wide thermal stability window, high ionic conductivities and appreciable mechanical integrity. The highest conductivity values are obtained for the compositions x = 0.70 and x = 0.75 (σ ≈ 6 × 10−3 S cm−1) and are related to the final melting of the materials. Overall, high conductivities are observed for 0.70 < x < 0.90 while low ones are found for x > 0.90. Raman and NMR spectroscopies reveal the presence of highly mobile Li-containing species, partly identified as [Li(TFSI)2]−, albeit rather unexpected for these high x values, which might explain the high ionic conductivities observed. To prove the general value of our concept in more detail, some first results on BMIMTFSI and PY13TFSI based systems are also presented.
Originalspracheenglisch
Seiten (von - bis)12341-12349
FachzeitschriftPhysical Chemistry, Chemical Physics
Jahrgang16
DOIs
PublikationsstatusVeröffentlicht - 2014

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Experimental

Fingerprint

Untersuchen Sie die Forschungsthemen von „“Ionic liquids-in-salt” – a promising electrolyte concept for high-temperature lithium batteries?“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren