 The study demonstrates the effectiveness of integrating a polyethyurethane-based solid-state polymer electrolyte with self-healing capability into solid-state Li-metal batteries, resulting in improved interfacial resistance and stable long-term cycling for more than 6000 HN Li-Li symmetric cells and 700 cycles at 0.3 C in solid-state Li-S batteries. The use of ultrasound imaging technology shows that the interfacial contact of the integrated structure is much better than those of traditional laminated structures. This article was authored by Fei Pei, Lin Wu, Yi Zhong, and others.