Elastic and ultra stable ionic conductors for long-life-time soft robots working at extreme environments

Lin Sun, Wenwen Feng, Yuncong Liu, Lili Chen, Tao Chen, Zhekai Jin and Chao Wang ()
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Lin Sun: Tsinghua University
Wenwen Feng: Tsinghua University
Yuncong Liu: Tsinghua University
Lili Chen: Tsinghua University
Tao Chen: Southwest Jiaotong University
Zhekai Jin: Tsinghua University
Chao Wang: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-15

Abstract: Abstract There is a pressing need for soft robots capable of rapid movement at extreme environments, necessitating the development of ionic conductors with high ionic conductivity, low Young’s modulus, high elasticity, and high stability at extreme environments. However, existing ionic conductor materials cannot meet all of above needs. The preparation of water-free ionic conductive organogels is expected to solve the above problems. In this work, we design a synergy strategy to combine ion-dipole interactions with hydrogen bonds and successfully obtain ethylene glycol (EG) gels at a low polymer concentration of 5 mol%. Our EG gels possess high ionic conductivity (1.31 mS cm−1), low Young’s modulus (7.3 kPa), high elasticity (~100%), and good extreme environmental stability. The EG gels can work stably for long time at extreme environments (−27 to 123 °C and 10% to 70% relative humidity (RH)). Furthermore, we successfully achieved dielectric elastomer actuator devices stable operation at extreme environments and with 42 times longer lifetime than commonly used ionogels. We also achieved a soft robot that can work stably at extreme environments with a high speed of 3.6 BL s−1 (body lengths per second).

Date: 2025
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DOI: 10.1038/s41467-025-61217-y

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