Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate
Magnesium-ion-conducting solid polymer electrolytes have been studied for rechargeable Mg metal batteries, one of the beyond-Li-ion systems. In this paper, magnesium polymer electrolytes with magnesium bis(trifluoromethane)sulfonimide (Mg(TFSI)2) salt in poly(ε-caprolactone-co-trimethylene carbonate...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
2021-01-01
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| Series: | Energy Material Advances |
| Online Access: | http://dx.doi.org/10.34133/2021/9895403 |
| _version_ | 1818926932296728576 |
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| author | Bumjun Park Rassmus Andersson Sarah G. Pate Jiacheng Liu Casey P. O’Brien Guiomar Hernández Jonas Mindemark Jennifer L. Schaefer |
| author_facet | Bumjun Park Rassmus Andersson Sarah G. Pate Jiacheng Liu Casey P. O’Brien Guiomar Hernández Jonas Mindemark Jennifer L. Schaefer |
| author_sort | Bumjun Park |
| collection | DOAJ |
| description | Magnesium-ion-conducting solid polymer electrolytes have been studied for rechargeable Mg metal batteries, one of the beyond-Li-ion systems. In this paper, magnesium polymer electrolytes with magnesium bis(trifluoromethane)sulfonimide (Mg(TFSI)2) salt in poly(ε-caprolactone-co-trimethylene carbonate) (PCL-PTMC) were investigated and compared with the poly(ethylene oxide) (PEO) analogs. Both thermal properties and vibrational spectroscopy indicated that the total ion conduction in the PEO electrolytes was dominated by the anion conduction due to strong polymer coordination with fully dissociated Mg2+. On the other hand, in PCL-PTMC electrolytes, there is relatively weaker polymer–cation coordination and increased anion–cation coordination. Sporadic Mg- and F-rich particles were observed on the Cu electrodes after polarization tests in Cu|Mg cells with PCL-PTMC electrolyte, suggesting that Mg was conducted in the ion complex form (MgxTFSIy) to the copper working electrode to be reduced which resulted in anion decomposition. However, the Mg metal deposition/stripping was not favorable with either Mg(TFSI)2 in PCL-PTMC or Mg(TFSI)2 in PEO, which inhibited quantitative analysis of magnesium conduction. A remaining challenge is thus to accurately assess transport numbers in these systems. |
| first_indexed | 2024-12-20T03:04:58Z |
| format | Article |
| id | doaj.art-92dc82bcf78d4d39b19686523ab703cd |
| institution | Directory Open Access Journal |
| issn | 2692-7640 |
| language | English |
| last_indexed | 2024-12-20T03:04:58Z |
| publishDate | 2021-01-01 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | Article |
| series | Energy Material Advances |
| spelling | doaj.art-92dc82bcf78d4d39b19686523ab703cd2022-12-21T19:55:38ZengAmerican Association for the Advancement of Science (AAAS)Energy Material Advances2692-76402021-01-01202110.34133/2021/9895403Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-PolycarbonateBumjun Park0Rassmus Andersson1Sarah G. Pate2Jiacheng Liu3Casey P. O’Brien4Guiomar Hernández5Jonas Mindemark6Jennifer L. Schaefer7Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USADepartment of Chemistry-Ångström Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala, SwedenDepartment 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 Chemistry-Ångström Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala, SwedenDepartment of Chemistry-Ångström Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala, SwedenDepartment of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USAMagnesium-ion-conducting solid polymer electrolytes have been studied for rechargeable Mg metal batteries, one of the beyond-Li-ion systems. In this paper, magnesium polymer electrolytes with magnesium bis(trifluoromethane)sulfonimide (Mg(TFSI)2) salt in poly(ε-caprolactone-co-trimethylene carbonate) (PCL-PTMC) were investigated and compared with the poly(ethylene oxide) (PEO) analogs. Both thermal properties and vibrational spectroscopy indicated that the total ion conduction in the PEO electrolytes was dominated by the anion conduction due to strong polymer coordination with fully dissociated Mg2+. On the other hand, in PCL-PTMC electrolytes, there is relatively weaker polymer–cation coordination and increased anion–cation coordination. Sporadic Mg- and F-rich particles were observed on the Cu electrodes after polarization tests in Cu|Mg cells with PCL-PTMC electrolyte, suggesting that Mg was conducted in the ion complex form (MgxTFSIy) to the copper working electrode to be reduced which resulted in anion decomposition. However, the Mg metal deposition/stripping was not favorable with either Mg(TFSI)2 in PCL-PTMC or Mg(TFSI)2 in PEO, which inhibited quantitative analysis of magnesium conduction. A remaining challenge is thus to accurately assess transport numbers in these systems.http://dx.doi.org/10.34133/2021/9895403 |
| spellingShingle | Bumjun Park Rassmus Andersson Sarah G. Pate Jiacheng Liu Casey P. O’Brien Guiomar Hernández Jonas Mindemark Jennifer L. Schaefer Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate Energy Material Advances |
| title | Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate |
| title_full | Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate |
| title_fullStr | Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate |
| title_full_unstemmed | Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate |
| title_short | Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate |
| title_sort | ion coordination and transport in magnesium polymer electrolytes based on polyester co polycarbonate |
| url | http://dx.doi.org/10.34133/2021/9895403 |
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