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Cui et al. Energy Mater 2023;3:300034 https://dx.doi.org/10.20517/energymater.2023.19 Page 9 of 12

Figure 6. Cross-sectional SEM images of the solid-state Li-S batteries using the PO-PU-LiTFSI electrolytes with (A) 80 wt% and
(B) 20 wt% LiTFSI content after plating/stripping for 50 cycles. SEM images of the Li anodes from the batteries using the PO-PU-LiTFSI
electrolytes with (C) 80 wt% and (D) 20 wt% LiTFSI content after plating/stripping for 50 cycles. (E) In-situ optical microscopy images
of the electrode/electrolyte interfaces of the solid-state Li-S battery after different cycles. (F) Optical microscopy images show the self-
healing of the electrode/electrolyte interface. (G) Mechanism illustration of the robust interface using the PO-PU-LiTFSI electrolyte.