Solid polymer electrolytes (SPEs) have significant potential to improve the energy density of lithium batteries and exhibit good flexibility, electrochemical stability and increased safety. In this study, a biocompatible and biodegradable SPE is prepared by using the natural product, wheat flour. The SPE is found to have an ionic conductivity of 2.62 Â 10 À5 S cm À1 at 25 C with a Li + ionic transference number of 0.51.
A composite solid electrolyte based on PEO-NaTFSI (polyethylene oxide-sodium bis(trifluoromethanesulfonyl)imide) and Na 3 Zr 2 Si 2 PO 12 is fabricated for all-solid-state NaÀ S battery (ASSB). When the molar ratio of EO (ethylene oxide of PEO) to Na + (sodium ion of NaTFSI) is 20 and the amount of Na 3 Zr 2 Si 2 PO 12 is 30 wt%, a highest ionic conductivity of 3.14 × 10 À 4 S cm À 1 and the sodium ion transference number of 0.66 are achieved at 60 °C. Harnessing the electrolyte's improved sodium ion transport abilities enables ASSB's assembled with a sulfur cathode and sodium metal anode to exhibit highly reversible current-rates and capacity retention. At 0.2 C and 60 °C, the battery delivers a superior discharge capacity of 1110.0 mAh g À 1 in the first cycle and maintains 666.8 mAh g À 1 after 60 cycles with a stable Coulombic efficiency near 100 %.
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