A Self‐Healing Integrated All‐in‐One Zinc‐Ion Battery

The self‐healing of zinc‐ion batteries (ZIBs) will not only significantly improve the durability and extend the lifetime of the devices, but also reduce the electronic waste and economic cost. However, it is still a challenge to design desired electrolyte and device configuration to meet the demand of self‐healing ZIBs. Herein, we fabricated a poly(vinyl alcohol)/zinc trifluoromethanesulfonate (PVA/Zn(CF3SO3)2) hydrogel electrolyte by a facile freezing/thawing strategy. PVA/Zn(CF3SO3)2 hydrogels possess excellent ionic conductivity and stable electrochemical performance. More importantly, such hydrogel electrolytes can autonomously self‐heal by the hydrogen bonds without any external stimulus. Furthermore, all‐in‐one integrated ZIBs can be assembled by incorporating the cathode, separator and anode into hydrogel matrix since the fabrication of PVA/Zn(CF3SO3)2 hydrogel is a process of converting the liquid to quasi‐solid state. Impressively, the ZIBs still show an outstanding self‐healing ability and can recover the electrochemical performance completely even after several cutting/healing cycles. It offers broad prospects to fabricate various self‐healing batteries for designing as sustainable energy storage devices in wearable electronics.

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