Correlation between Solvation Structure and Ion-Conductive Behavior of Concentrated Poly(ethylene carbonate)-Based Electrolytes
| Autor: | Yoichi Tominaga, Joh Motomatsu, Kento Kimura |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Solvation Salt (chemistry) chemistry.chemical_element 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound General Energy chemistry Physical chemistry Organic chemistry Lithium Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Ethylene carbonate |
| Zdroj: | The Journal of Physical Chemistry C. 120:12385-12391 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b03277 |
| Popis: | Solid polymer electrolytes are important materials in realizing safe and flexible energy storage devices. The present study looks at correlation between solvation structure and the ion-conductive behavior of poly(ethylene carbonate) (PEC)/lithium bis(fluorosulfonyl)imide (LiFSI) electrolytes which have high Li transference number (t+) and show unusual salt-concentration dependence of conductivity. From FT-IR and Raman spectroscopy, we determined that Li ions interact with carbonyl (C═O) groups and also with FSI ions, which can be referred to as contact ion pair or aggregate. 7Li magic-angle-spinning NMR spectroscopy and density functional theory calculations for model species suggest that a loose coordination structure, in which Li ions interact with C═O groups and FSI ions with appropriate strength, allows the electrolytes to have both reasonable conductivity and high t+ with a flexible and transparent character. A high salt dissociation rate is generally considered essential in SPEs, but the presence of... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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