期刊
GELS
卷 8, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/gels8110725
关键词
iongel electrolyte; polymer electrolyte; sodium metal battery
资金
- European Union [797295]
- SNSF (Swiss National Science Foundation) [P2FRP2_191846]
- Basque Government [Elkartek KK-2020/00078]
- Agencia Estatal de Investigacion [PID2020-119026GB-100, PID2019-107468RB-C22, PLEC2021-007929]
- NSF [CHE-2102425]
- Swiss National Science Foundation (SNF) [P2FRP2_191846] Funding Source: Swiss National Science Foundation (SNF)
- Marie Curie Actions (MSCA) [797295] Funding Source: Marie Curie Actions (MSCA)
Sodium metal batteries are a promising emerging technology that requires solid electrolytes to address safety issues. This study demonstrates a simple method to prepare a mechanically robust and efficient soft solid electrolyte, which exhibits high ionic conductivity and tunable storage modulus.
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 (10(4)-10(7) 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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