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Task-Specific Phosphonium Iongels by Fast UV-Photopolymerization for Solid-State Sodium Metal Batteries
journal contribution
posted on 2023-02-15, 03:04 authored by L Porcarelli, JL Olmedo-Martínez, P Sutton, V Bocharova, A Fdz De Anastro, M Galceran, AP Sokolov, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth, D MecerreyesSodium metal batteries are an emerging technology that shows promise in terms of materials availability with respect to lithium batteries. Solid electrolytes are needed to tackle the safety issues related to sodium metal. In this work, a simple method to prepare a mechanically robust and efficient soft solid electrolyte for sodium batteries is demonstrated. A task-specific iongel electrolyte was prepared by combining in a simple process the excellent performance of sodium metal electrodes of an ionic liquid electrolyte and the mechanical properties of polymers. The iongel was synthesized by fast (<1 min) UV photopolymerization of poly(ethylene glycol) diacrylate (PEGDA) in the presence of a saturated 42%mol solution of sodium bis(fluorosulfonyl)imide (NaFSI) in trimethyl iso-butyl phosphonium bis(fluorosulfonyl)imide (P111i4FSI). The resulting soft solid electrolytes showed high ionic conductivity at room temperature (≥10−3 S cm−1) and tunable storage modulus (104–107 Pa). Iongel with the best ionic conductivity and good mechanical properties (Iongel10) showed excellent battery performance: Na/iongel/NaFePO4 full cells delivered a high specific capacity of 140 mAh g−1 at 0.1 C and 120 mAh g−1 at 1 C with good capacity retention after 30 cycles.
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Journal
GelsVolume
8Article number
ARTN 725Location
SwitzerlandPublisher DOI
ISSN
2310-2861eISSN
2310-2861Language
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
11Publisher
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