New Liquid Metal Hydrogel Electrolyte Enables Ultra-Stretchable Energy Storage in Extreme Sub-Zero Temperatures

New liquid metal-initiated hydrogel electrolyte enables supercapacitors to stretch 900% and function at -40°C for advanced wearable and robotic tech.

By: AXL Media

Published: Apr 16, 2026, 7:45 AM EDT

Source: Information for this report was sourced from Shanghai Jiao Tong University Journal Center

Engineering Resilience for Next-Generation Soft Robotics

The rapid advancement of wearable electronics and soft robotics has created an urgent need for energy storage devices that can withstand both extreme mechanical deformation and harsh environmental conditions. Conventional hydrogel electrolytes often fail these requirements, as high water content leads to freezing in cold climates and a lack of structural integrity. To address this, a research team from Sungkyunkwan University has engineered a novel material that utilizes liquid metal nanoparticles to create a robust, anti-freezing network, ensuring reliable performance where traditional batteries and capacitors would typically crack or fail.

The Role of Liquid Metal in Polymerization

At the heart of this innovation is a rapid synthesis process driven by liquid metal-initiated free-radical polymerization. Gallium nanoparticles are used to generate radicals that cross-link acrylamide and acrylic acid in as little as one minute. This method creates a dense physical network enhanced by hydrophobic stearyl methacrylate associations. These associations act as dynamic cross-linking points, allowing the material to absorb mechanical stress while maintaining the internal pathways necessary for moving ions, a combination that has historically been difficult to achieve in hydrogel chemistry.

Breaking the Thermodynamic Barriers of Freezing

To ensure the device remains functional in arctic conditions, the researchers utilized a lithium chloride immersion technique to disrupt the hydrogen bonding between water molecules. By depressing the freezing point, the hydrogel maintains a high ionic conductivity of 3.39 S m-1 even at -20°C. This chemical modification prevents the formation of ice crystals that would otherwise shatter the electrolyte, allowing the system to operate stably from -40°C up to 80°C. This thermal range far exceeds the capabilities of standard hydrogels, which are often restricted to temperate environments.