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Towards more therma...
Towards more thermally stable Li-ion battery electrolytes with salts and solvents sharing nitrile functionality
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- Kerner, Manfred, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Lim, Du Hyun, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Jeschke, Steffen, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Rydholm, Tomas, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ahn, J. H. (author)
- Gyeongsang National University
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- Scheers, Johan, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2016
- 2016
- English.
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In: Journal of Power Sources. - : Elsevier BV. - 0378-7753. ; 332, s. 204-212
- Related links:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The overall safety of Li-ion batteries is compromised by the state-of-the-art electrolytes; the thermally unstable lithium salt, lithium hexafluorophosphate (LiPF6), and flammable carbonate solvent mixtures. The problem is best addressed by new electrolyte compositions with thermally robust salts in low flammability solvents. In this work we introduce electrolytes with either of two lithium nitrile salts, lithium 4,5-dicyano-1,2,3-triazolate (LiDCTA) or lithium 4,5-dicyano-2-trifluoromethylimidazolide (LiTDI), in solvent mixtures with high flashpoint adiponitrile (ADN), as the main component. With sulfolane (SL) and ethylene carbonate (EC) as co-solvents the liquid temperature range of the electrolytes are extended to lower temperatures without lowering the flashpoint, but at the expense of high viscosities and moderate ionic conductivities. The anodic stabilities of the electrolytes are sufficient for LiFePO4 cathodes and can be charged/discharged for 20 cycles in Li/LiFePO4 cells with coulombic efficiencies exceeding 99% at best. The excellent thermal stabilities of the electrolytes with the solvent combination ADN:SL are promising for future electrochemical investigations at elevated temperatures (> 60 degrees C) to compensate the moderate transport properties and rate capability. The electrolytes with EC as a co-solvent, however, release CO2 by decomposition of EC in presence of a lithium salt, which potentially makes EC unsuitable for any application targeting higher operating temperatures.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- LiTDI
- Adiponitrile
- Li-ion battery
- Sulfolane
- High flashpoint electrolytes
- LiDCTA
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Kerner, Manfred, ...
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Lim, Du Hyun, 19 ...
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Jeschke, Steffen ...
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Rydholm, Tomas, ...
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Ahn, J. H.
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Scheers, Johan, ...
- About the subject
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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 ...
- Articles in the publication
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Journal of Power ...
- By the university
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Chalmers University of Technology