Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 24, Pages 12341-12349Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01133c
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Funding
- Swedish Research Council
- Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS)
- Chalmers Energy and Transport Areas of Advance
- Austrian Federal Ministry of Economy, Family and Youth
- Austrian National Foundation for Research, Technology and Development
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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 (sigma approximate to 6 x 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.
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