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Caption : fig. s1 the morphology and eds-mapping of l-peo.
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Caption : fig. s2 the sem planar and cross-sectional image of p-peo, l-peo and s-peo.
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Caption : fig. s3 the sem of lif and naf.
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Caption : fig. s4 the i120/i112 of xrd signals of p-peo, l-peo and s-peo.
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Caption : fig. s5 the afm 3d image of p-peo, l-peo and s-peo.
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Caption : fig. s6 the (a) tensile and (b) puncture mechanical properties of p-peo, l-peo and s-peo.
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Caption : fig. s7 the ftir of p-peo, l-peo and s-peo.
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Caption : fig. s8 the (a)1h and (b)23na solid-state nmr spectra of p-peo, l-peo and s-peo.
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Caption : fig. s9 the (a)arrhenius diagrams and (b)li+ transference number at 65 °c of p-peo, l-peo and s-peo.
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Caption : fig. s10 the (a)linear sweep voltammetry plots and (b)electrochemical floating analysis using nvp cathodes of p-peo, l-peo and s-peo.
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Caption : fig. s11 tof-sims mass spectrum of (a)p-peo and (b)l-peo.
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Caption : fig. s12 fea simulated concentration distribution of solid-state na battery system with (a) p-peo, (b) s-peo and (c) l-peo.
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Caption : fig. s13 sem images of na after cycling in (a) na|p-peo|nvp, (b) na|s-peo|nvp, and (c) na|l-peo|nvp cells (na stripping).
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Caption : fig. s14 drt analysis of nvp||na cells with (a) p-peo, (b) s-peo, and (c) l-peo at different charging voltages.
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Caption : fig. s15 drt analysis of nvp||na batteries with p-peo, s-peo, and l-peo under 2.5v (left) and 3.8v (right) charging voltages.
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Caption : fig. s16 cycling performance (with a fixed current density and capacity of 0.1 mah cm−2 and 0.1 ma cm−2) of na||na symmetrical cells with p-peo, l-peo and s-peo.
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Caption : fig. s17 voltage profiles of nvp||na cells with (a) p-peo and (b) s-peo.