Fig. 4: Ion transport mechanism and mechanical properties of DSICE.

a Ionic conductivity of DSICE varying the amount of LiTFSI from 10 wt.% to 40 wt.% at 30 °C. The ionic conductivity of DSICE-35 reaches the maximum value of 3.77 × 10⁻³ S m⁻¹. b Schematic illustration of Li⁺ transporting in the PTMEG chains with loose coordination structure. c ⁷Li NMR traces of DSICE (DSE-0, DSE-1, DSE-2, DSE-3 with 35 wt.% LiTFSI). d Ionic conductivity of DSE-0~3 with the same amount of 35 wt.% LiTFSI at 30 °C. The ionic conductivity of DSE-0~3 with 35 wt.% LiTFSI keeps almost consistent, suggesting that the ionic conductivity of DSICE originate from the soft phase and independent on the hard phase of the polymer backbone, thereby demonstrating phase-locked strategy of DSICE. e DSC traces of DSICE-10~40. Tg of DSICE elevates along with the increasing amount of LiTFSI, indicating that the introduction of LiTFSI leads to the restricted movement of polymer chains caused by the coordination of Li⁺ with the soft PTMEG segments. f Digital graph of stretchability of DSICE-30. DSICE can be stretched to >2000% of the original sample. g Typical stress–strain curves of DSICE-10~40. Deformation rate: 100 mm min⁻¹. Insert: local enlarged view of low strain region of the stress–strain curves. h Toughness of DSICE-10~40. Error bars represent the standard deviation calculated by the data sets (n = 3).