Integrated Construction of A Long-Life Stretchable Zinc-Ion Capacitor.

The major challenge in achieving high-performance stretchable zinc ion energy storage devices is the combination of stretchable dendrite-free zinc negative electrodes and sufficient bonding between components (current collector, electrode, separator and package). Herein, based on a series of physicochemically tunable self-healing polyurethanes, we prepared an elastic current collector through swelling induced wrinkling method, and then prepared a stretchable zinc negative electrode through in-situ confined electroplating. The elastic current collector has a nano-network structure with polyurethane encapsulation and exhibits both geometric and intrinsic stretchability. The stretchable zinc negative electrode formed in situ has high electrochemical activity and exhibits an excellent cycle life under the protection of a Zn 2+ -permeable coating. Furthermore, fully polyurethane-based stretchable zinc ion capacitors were assembled through in-situ electrospinning and hot-pressing techniques. Due to the high stretchability of the components and the interfusion of the matrixes, the integrated device exhibits excellent deformability and desirable electrochemical stability. This work provides a systematic construction plan for stretchable zinc ion energy storage devices in three aspects: material synthesis, component preparation, and device assembly. This article is protected by copyright. All rights reserved.