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Formulation and Characterization of PS-Poly(ionic liquid) Triblock Electrolytes for Sodium Batteries
journal contribution
posted on 2023-02-14, 02:58 authored by Sneha Subhas Malunavar, A Gallastegui, Xiaoen Wang, F Makhlooghiazad, D Mecerreyes, M Armand, M Galceran, Patrick HowlettPatrick Howlett, Maria ForsythMaria ForsythSolvent-free solid polymer electrolytes (SPE) are gaining more attention to develop postlithium battery technologies due to the safety and performance benefits of solid-state batteries. In this work, we present a new SPE for a sodium metal battery based on high salt concentration polymer electrolyte membranes comprising mixed anions, polymerized ionic liquid (PIL), block copolymer (BCP) polystyrene-b-poly(diallydimethylammonium)bis(trifluoromethanesulfonyl)imide-b-polystyrene (PS-b-PDADMATFSI-b-PS) and NaFSI salt. The maximum salt concentration incorporated was up to 1:2 mol ratio (PIL block: NaFSI). The ionic conductivity was 10-3S cm-1at 70 °C for 1:2 composition, and the anion diffusion as measured by 19F NMR decreased. FTIR measurement indicates that the ion coordination in the polymer-salt mixtures changes with composition. The storage modulus as measured by dynamic mechanical analysis (DMA) was observed in the range 300 MPa at -40 °C to 35.8 MPa at 70 °C. The optimized electrolyte (1:2 mol ratio) membrane was investigated for its long-term stability against Na metal cycling with Na/Na symmetrical cells demonstrating stable Na plating/stripping behavior at 0.2 mA cm-2at 70 °C. Finally, an Na|NaFePO4cell cycled with a specific capacity of 118 mAh g-1at C-rate C/20 at 70 °C and a good Coulombic efficiency (98%), showing the promising potential of these solvent-free triblock copolymer electrolytes in Na metal batteries.
History
Journal
ACS Applied Polymer MaterialsVolume
4Pagination
8977-8986Publisher DOI
ISSN
2637-6105eISSN
2637-6105Language
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
12Publisher
AMER CHEMICAL SOCUsage metrics
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Science & TechnologyTechnologyPhysical SciencesMaterials Science, MultidisciplinaryPolymer ScienceMaterials Sciencesolid-state polymer electrolytePIL blockNa metal batteriesnonflammableglass transition temperatureBLOCK-COPOLYMER ELECTROLYTESN-METHYLPYRROLIDINIUM BIS(FLUOROSULFONYL)IMIDELIFE-CYCLE COSTSPOLYMER ELECTROLYTESPOLY(IONIC LIQUID)IONIC LIQUIDPHYSICOCHEMICAL PROPERTIESLITHIUMCONDUCTORSMORPHOLOGY7 Affordable and Clean EnergyInstitute for Frontier MaterialsDP160101178340305 Physical properties of materials340604 Electrochemistry
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