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Concentration Depen...
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Franko, Christopher J.McMaster University
(author)
Concentration Dependent Solution Structure and Transport Mechanism in High Voltage LiTFSI-Adiponitrile Electrolytes
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-12-15
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The Electrochemical Society,2020
Numbers
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LIBRIS-ID:oai:research.chalmers.se:9a659e5c-5819-4981-b463-c9469583d23d
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https://research.chalmers.se/publication/521683URI
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https://doi.org/10.1149/1945-7111/abcf17DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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The physiochemical properties of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in adiponitrile (ADN) electrolytes were explored as a function of concentration. The phase diagram and ionic conductivity plots show a distinct relationship between the eutectic composition of the electrolyte and the concentration of maximum ionic conductivity in the 25 degrees C isotherm. We propose a structure-based explanation for the variation of electrolyte ionic conductivity with LiTFSI concentration, where the eutectic concentration is a transitionary region at which the structure changes from solvated contact ion pairs to extended units of [Li-z(ADN)(x)TFSIy](z-y) aggregates. It is found through diffusion coefficient measurements using pulsed-field gradient (PFG) NMR that both D-Li/D-TFSI and D-Li/D-ADN increase with concentration until 2.9 M, where after Li+ becomes the fastest diffusing species, suggesting that ion hopping becomes the dominant transport mechanism for Li+. Variable diffusion-time (Delta) PFG NMR is used to track this evolution of the ion transport mechanism. A differentiation in Li+ transport between the micro and bulk levels that increases with concentration was observed. It is proposed that ion hopping within [Li-z(ADN)(x)TFSIy](z-y) aggregates dominates the micro-scale, while the bulk-scale is governed by vehicular transport. Lastly, we demonstrate that LiTFSI in ADN is a suitable electrolyte system for use in Li-O-2 cells.
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Yim, Chae-HoNational Research Council Canada
(author)
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Årén, Fabian,1994Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)afabian
(author)
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Åvall, Gustav,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)avall
(author)
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Whitfield, Pamela S.National Research Council Canada
(author)
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Johansson, Patrik,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jpatrik
(author)
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Abu-Lebdeh, Yaser A.National Research Council Canada
(author)
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Goward, Gillian R.McMaster University
(author)
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McMaster UniversityNational Research Council Canada
(creator_code:org_t)
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In:Journal of the Electrochemical Society: The Electrochemical Society167:161945-71110013-4651
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