Fig. 5: Physicochemical properties and Na+ conduction of COF-QSSEs. | Nature Communications

Fig. 5: Physicochemical properties and Na+ conduction of COF-QSSEs.

From: Bioinspired design of Na-ion conduction channels in covalent organic frameworks for quasi-solid-state sodium batteries

Fig. 5

a FTIR spectra of the prepared TPDBD-CNa-QSSE, TPBD-QSSE, and PC solvent (cycled COF films in Na||Na cells over 20 cycles at 0.02 mA cm−2 and 25 ± 1 °C). b Na–O bond lengths in PC-Na and PC-NaTFSI. c Schematic diagram of the PC, Na+, and TFSI− distributions in TPDBD-CNa (the white, blue, gray, cyan, yellow, purple, and red spheres denote hydrogen, nitrogen, carbon, fluorine, sulfur, sodium, and oxygen, respectively). d Arrhenius plot of the ionic conductivity of TPDBD-CNa-QSSE and TPBD-QSSE. e Current-time curves of the Na|TPDBD-CNa-QSSE|Na symmetric cell (inset shows the EIS at initial and steady states and corresponding equivalent circuit model). f Comparison of the typical performance of reported Li+/Na+ SSEs (the numerical values and testing temperature for the ionic conductivities provided in Supplementary Table 4).

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