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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 Mecerreyes
Sodium 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.

History

Journal

Gels

Volume

8

Article number

ARTN 725

Location

Switzerland

ISSN

2310-2861

eISSN

2310-2861

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Issue

11

Publisher

MDPI

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