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Concentration Depen...
Concentration Dependent Solution Structure and Transport Mechanism in High Voltage LiTFSI-Adiponitrile Electrolytes
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- Franko, Christopher J. (author)
- McMaster University
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- Yim, Chae-Ho (author)
- National Research Council Canada
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- Årén, Fabian, 1994 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Åvall, Gustav, 1988 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Whitfield, Pamela S. (author)
- National Research Council Canada
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- Johansson, Patrik, 1969 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Abu-Lebdeh, Yaser A. (author)
- National Research Council Canada
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- Goward, Gillian R. (author)
- McMaster University
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(creator_code:org_t)
- 2020-12-15
- 2020
- English.
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In: Journal of the Electrochemical Society. - : The Electrochemical Society. - 1945-7111 .- 0013-4651. ; 167:16
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https://doi.org/10.1...
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Abstract
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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.
Subject headings
- 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 -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
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Franko, Christop ...
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Yim, Chae-Ho
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Årén, Fabian, 19 ...
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Åvall, Gustav, 1 ...
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Whitfield, Pamel ...
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Johansson, Patri ...
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Abu-Lebdeh, Yase ...
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Goward, Gillian ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Inorganic Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Chalmers University of Technology