Self‐healing Micro‐Supercapacitor Based on Robust Liquid Metal‐CNT‐PEDOT:PSS Film for Wireless Powering of Integrated Strain Sensor

Abstract The limited energy density of micro‐supercapacitors (MSCs) and challenges in their integration significantly impede the advancement of MSCs in wearable electronic devices. Here, this work designs a robust and wrinkled liquid metal‐CNT‐PEDOT:PSS film with high capacity and self‐healing properties (defined as LM‐CNT‐PEDOT:PSS). The wrinkled structure further enhances tensile properties of LM‐CNT‐PEDOT:PSS and increases its active specific surface area per unit. Simultaneously, the incorporation of liquid metal (LM) enhances both the mechanical and healing properties of the LM‐CNT‐PEDOT:PSS electrode. The flexible and self‐healing MSC based on wrinkled LM‐CNT‐PEDOT:PSS shows a remarkable specific capacitance of 114.29 mF cm −2 and a high areal energy density of 15.47 µW h cm −2 . Furthermore, the electrochemical performance of the healed MSC retained 90.01% of its initial performance, and the MSC unit can be arbitrarily integrated according to various energy and voltage requirements through the healing properties of LM‐CNT‐PEDOT:PSS, widening the range of applications in next‐generation microelectronic devices. The wrinkled LM‐CNT‐PEDOT:PSS film is utilized for the fabrication of a highly sensitive strain sensor. Simultaneously, the prepared sensor can be seamlessly integrated with wireless charging and MSC to facilitate convenient monitoring of physiological signals, thereby offering an effective solution for the advancement of wearable technology and self‐powered systems.