A Cellulose Ionogel with Mechanical Robustness and Extreme Temperature Tolerance for Electronic Skin

Abstract Ionogels consist of polymers and ions have emerged as promising application in flexible electronic devices. However, challenges remain in achieving the mechanical properties and low‐temperature tolerance of ionogels. Here, a cellulose ionogel is reported by triggering the mechano‐induced alignment of cellulose molecular chains and incorporating Ca 2+ complexation interactions. This cellulose ionogel presents outstanding mechanical properties and ionic conductivity, featuring a tensile strength of 6.84 MPa, an elastic modulus surpassing 100 MPa, and an ionic conductivity of 31.7 mS·cm −1 . Furthermore, the Ca 2+ complexation networks provide the cellulose ionogel with remarkable freezing resistance, allowing it to maintain flexibility even at temperatures as low as −196 °C, while the assembled electronic skin displays reliable sensing performance. The combination of robust mechanical strength, high ionic conductivity, biocompatibility, and extreme temperature tolerance underscores the potential applications of this cellulose ionogel, ensuring the stable operation of flexible electronic devices in highly challenging environments.