| Autor: |
Jaeyong Lee, Kevin W. Gao, Neel J. Shah, Cheol Kang, Rachel L. Snyder, Brooks A. Abel, Lilin He, Susana C. M. Teixeira, Geoffrey W. Coates, Nitash P. Balsara |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Macromolecules, vol 55, iss 24 |
| Popis: |
We have studied ion transport in electrolytes created by blending two different polymers and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The polymers covered in this study are poly(ethylene oxide) (PEO), poly(1,3,6-trioxocane) (P(2EO-MO)), and poly(1,3-dioxolane) (P(EO-MO)). Ion transport is quantified by the product κρ+which is defined as the efficacy of the electrolytes, where κ is conductivity and ρ+is the current fraction determined by the Bruce-Vincent method. Polymer blends can be either one-phase or macrophase-separated. We used small-angle neutron scattering (SANS) to distinguish between these two possibilities. The random phase approximation (RPA) was used to interpret SANS data from one-phase blends. The effect of added salt on polymer blend thermodynamics is quantified by an effective Flory-Huggins interaction parameter. All polymer blends were one-phase in the absence of salt. Adding salt in small concentrations results in macrophase separation in all cases. One-phase systems were observed in the PEO/P(EO-MO)/LiTFSI blends at high salt concentrations. In most of the polymer blend electrolytes, the measured κρ+was either lower than or comparable to that of the homopolymer electrolytes. An exception to this was one-phase PEO/P(EO-MO)/LiTFSI blends electrolytes at high salt concentrations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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