Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies
In this study, the amphiphilic salt lithium trifluoromethanesulfonylimide octadecane (C18LiTFSI) was used as a basis to investigate the effects of anion density and cation coordination sites within blended electrolytes with strong ionic aggregation. C18LiTFSI was previously reported as a single-comp...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/13/6529 |
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| author | Hannah Collins Jiacheng Liu Lingyu Yang Jennifer L. Schaefer |
| author_facet | Hannah Collins Jiacheng Liu Lingyu Yang Jennifer L. Schaefer |
| author_sort | Hannah Collins |
| collection | DOAJ |
| description | In this study, the amphiphilic salt lithium trifluoromethanesulfonylimide octadecane (C18LiTFSI) was used as a basis to investigate the effects of anion density and cation coordination sites within blended electrolytes with strong ionic aggregation. C18LiTFSI was previously reported as a single-component, ion-condensed electrolyte with a wide layered liquid crystalline phase regime. Three additive molecules with varyingly sized polar sulfonyl groups attached to an octodecane-tail were synthesized and mixed with C18LiTFSI. The thermal properties, morphology, and ionic conductivity of the blended electrolytes were characterized. It was found that the blended electrolytes exhibited layered liquid crystalline morphology over a narrower temperature range than the pure salt, and the ionic conductivity of the blended liquid crystalline electrolytes were generally lower than that of the pure salt. Surprising, the additives were found to have the greatest effect on the bulk ionic conductivity of the semicrystalline phase of the electrolytes. Addition of minor fractions of methylsulfonyloctadecane to C18LiTFSI resulted in increases in conductivity of over two orders of magnitude at room temperature, while addition of ethylsulfonyloctadecane or isopropylsulfonyloctadecane with the larger head group resulted in decreased ionic conductivity over the entire composition space and temperature range investigated. |
| first_indexed | 2024-03-09T22:07:54Z |
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| id | doaj.art-d7e09bb7079d4a70bfbac6854326b363 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:07:54Z |
| publishDate | 2022-06-01 |
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| spelling | doaj.art-d7e09bb7079d4a70bfbac6854326b3632023-11-23T19:38:23ZengMDPI AGApplied Sciences2076-34172022-06-011213652910.3390/app12136529Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered MorphologiesHannah Collins0Jiacheng Liu1Lingyu Yang2Jennifer L. Schaefer3Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USADepartment of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USADepartment of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USADepartment of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USAIn this study, the amphiphilic salt lithium trifluoromethanesulfonylimide octadecane (C18LiTFSI) was used as a basis to investigate the effects of anion density and cation coordination sites within blended electrolytes with strong ionic aggregation. C18LiTFSI was previously reported as a single-component, ion-condensed electrolyte with a wide layered liquid crystalline phase regime. Three additive molecules with varyingly sized polar sulfonyl groups attached to an octodecane-tail were synthesized and mixed with C18LiTFSI. The thermal properties, morphology, and ionic conductivity of the blended electrolytes were characterized. It was found that the blended electrolytes exhibited layered liquid crystalline morphology over a narrower temperature range than the pure salt, and the ionic conductivity of the blended liquid crystalline electrolytes were generally lower than that of the pure salt. Surprising, the additives were found to have the greatest effect on the bulk ionic conductivity of the semicrystalline phase of the electrolytes. Addition of minor fractions of methylsulfonyloctadecane to C18LiTFSI resulted in increases in conductivity of over two orders of magnitude at room temperature, while addition of ethylsulfonyloctadecane or isopropylsulfonyloctadecane with the larger head group resulted in decreased ionic conductivity over the entire composition space and temperature range investigated.https://www.mdpi.com/2076-3417/12/13/6529ionic liquid crystalsliquid crystalsamphiphilicelectrolytesbatteries |
| spellingShingle | Hannah Collins Jiacheng Liu Lingyu Yang Jennifer L. Schaefer Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies Applied Sciences ionic liquid crystals liquid crystals amphiphilic electrolytes batteries |
| title | Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies |
| title_full | Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies |
| title_fullStr | Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies |
| title_full_unstemmed | Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies |
| title_short | Phase Behavior and Ionic Conductivity of Blended, Ion-Condensed Electrolytes with Ordered Morphologies |
| title_sort | phase behavior and ionic conductivity of blended ion condensed electrolytes with ordered morphologies |
| topic | ionic liquid crystals liquid crystals amphiphilic electrolytes batteries |
| url | https://www.mdpi.com/2076-3417/12/13/6529 |
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