File Name : figures1.tif Caption : fig. s1. optical images of pvdf-hfp nanofiber membrane and the measurement of the thickness. File Name : figures2.tif Caption : fig. s2. eds mappings of n₂v₈l_1-0.1 spe. File Name : figures3.tif Caption : fig. s3. cross-sectional sem image of the n₂v₈l_1-0.1 spe membrane. File Name : figures4.tif Caption : fig. s4. tg curves of n₁v₉l₁, n₂v₈l₁, n₃v₇l₁ and n₂v₈l_1-0.1 spes. File Name : figures5.tif Caption : fig. s5. the current-time curve for a li|n₂v₈l₁ spe|li symmetrical cell with an applied polarization voltage of 10 mv and the corresponding eis spectra before and after polarization. File Name : figures6.tif Caption : fig. s6. long-term constant current cycling plots of li|n₂v₈l₁ spe|li and li|n₂v₈l_1-0.1 spe|li cells at 0.5 ma cm^-2. File Name : figures7.tif Caption : fig. s7. long-term constant current cycling of li|spe|li cells with single-salt n₁v₉l₁ and n₃v₇l₁ spes at 0.1 ma cm^-2. File Name : figures8.tif Caption : fig. s8. ccd measurements of li|n₂v₈l₁ spe|li and li|n₂v₈l_1-0.1 spe|li cells. File Name : figures9.tif Caption : fig. s9. long-term cycling plots of li|n₁v₉l₁ spe|lfp and li|n₃v₇l₁ spe| lfp cells at 0.5 c. File Name : figures10.tif Caption : fig. s10. long-term cycling plots of li|n₂v₈l₁ spe|lfp and li|n₂v₈l_1-0.1 spe|lfp battery at 1 c. File Name : figures11.tif Caption : fig. s11. eis plots and the fitting curves of (a) li|n₁v₉l₁ spe|lfp, (b) li|n₂v₈l₁ spe|lfp, (c) li|n₃v₇l₁ spe|lfp, (d) li|n₂v₈l_1-0.1 spe|lfp before and after cycling. File Name : figures12.tif Caption : fig. s12. equivalent circuit model for eis fitting. File Name : figures13.tif Caption : fig.s13. the charge curves and leakage current plots (inset) of li||lfp batteries with different spes at a constant voltage of 4.0 v. File Name : figures14.tif Caption : fig. s14. sem images of (a) the initial al collector and the cycled al collectors with (b) n₂v₈l₁ spe and (c) n₂v₈l_1-0.1 spe after 300 cycles. File Name : figures15.tif Caption : fig. s15. cycling stability of li||ncm811 cells with n₁v₉l₁, n₂v₈l₁, n₃v₇l₁ and n₂v₈l_1-0.1 spes at 0.5 c.