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Sökning: onr:"swepub:oai:research.chalmers.se:2f47ae49-173c-46f3-a943-794d126e7de8" > Structure and dynam...

Structure and dynamics of highly concentrated LiTFSI/acetonitrile electrolytes

Lundin, Filippa, 1992 (författare)
Chalmers University of Technology
Aguilera Medina, Luis, 1983 (författare)
Chalmers University of Technology,Volvo Cars Corporation (VCC)
Hansen, Henriette Wase, 1988 (författare)
Chalmers University of Technology,Institut Laue Langevin
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Lages, Sebastian, 1979 (författare)
Chalmers University of Technology,Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Labrador, Ana (författare)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Niss, Kristine (författare)
Roskilde Universitet (RUC),Roskilde University (RUC)
Frick, Bernhard (författare)
Institut Laue-Langevin,Institut Laue Langevin
Matic, Aleksandar, 1968 (författare)
Chalmers University of Technology
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 (creator_code:org_t)
2021
2021
Engelska.
Ingår i: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 23:25, s. 13819-13826
Relaterad länk:
https://research.cha... (primary) (free)
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https://pubs.rsc.org...
http://dx.doi.org/10... (free)
https://doi.org/10.1...
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https://lup.lub.lu.s...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • High salt concentration has been shown to induce increased electrochemical stability in organic solvent-based electrolytes. Accompanying the change in bulk properties is a structural ordering on mesoscopic length scales and changes in the ion transport mechanism have also been suggested. Here we investigate the local structure and dynamics in highly concentrated acetonitrile electrolytes as a function of salt concentration. Already at low concentrations ordering on microscopic length scales in the electrolytes is revealed by small angle X-ray scattering, as a result of correlations of Li+ coordinating clusters. For higher salt concentrations a charge alternation-like ordering is found as anions start to take part in the solvation. Results from quasi-elastic neutron spectroscopy reveal a jump diffusion dynamical process with jump lengths virtually independent of both temperature and Li-salt concentration. The jump can be envisaged as dissociation of a solvent molecule or anion from a particular Li+ solvation structure. The residence time, 50-800 ps, between the jumps is found to be highly temperature and Li-salt concentration dependent, with shorter residence times for higher temperature and lower concentrations. The increased residence time at high Li-salt concentration can be attributed to changes in the interaction of the solvation shell as a larger fraction of TFSI anions take part in the solvation, forming more stable solvation shells.

Ämnesord

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Teoretisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)

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