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A new Na[(FSO₂)(n-C₄F₉SO₂)N]-based polymer electrolyte for solid-state sodium batteries
- Ma, Qiang, Liu, Juanjuan, Qi, Xingguo, Rong, Xiaohui, Shao, Yuanjun, Feng, Wenfang, Nie, Jin, Hu, Yong-Sheng, Li, Hong, Huang, Xuejie, Chen, Liquan, Zhou, Zhibin
- Journal of materials chemistry A 2017 v.5 no.17 pp. 7738-7743
- batteries, electrochemistry, electrolytes, polyethylene glycol, sodium, thermal stability
- To improve the safety of sodium (Na) batteries, we first report a new solid polymer electrolyte (SPE), composed of sodium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide (Na[(FSO₂)(n-C₄F₉SO₂)N], NaFNFSI) and poly(ethylene oxide) (PEO), which is prepared by a facile solution-casting method. The NaFNFSI/PEO (EO/Na⁺ = 15) blended polymer electrolyte exhibits a relatively high ionic conductivity of 3.36 × 10⁻⁴ S cm⁻¹ at 80 °C, sufficient thermal stability (>300 °C) and anodic electrochemical stability (≈4.87 V vs. Na⁺/Na) for application in solid-state Na batteries. Most importantly, the NaFNFSI-based SPE can not only deliver excellent chemical and electrochemical stability with Na metal, but can also display good cycling and current-rate performances for the Na|SPE|NaCu₁/₉Ni₂/₉Fe₁/₃Mn₁/₃O₂ cell. All of these outstanding properties would make the NaFNFSI-based SPE promising as a candidate for application in solid-state Na batteries.