Liquid metal-based soft, hermetic, and wireless-communicable seals for stretchable systems

Soft materials tend to be highly permeable to gases, making it difficult to create stretchable hermetic seals. With the integration of spacers, we demonstrate the use of liquid metals, which show both metallic and fluidic properties, as stretchable hermetic seals. Such soft seals are used in both a stretchable battery and a stretchable heat transfer system that involve volatile fluids, including water and organic fluids. The capacity retention of the battery was similar to 72.5% after 500 cycles, and the sealed heat transfer system showed an increased thermal conductivity of approximately 309 watts per meter-kelvin while strained and heated. Furthermore, with the incorporation of a signal transmission window, we demonstrated wireless communication through such seals. This work provides a route to create stretchable yet hermetic packaging design solutions for soft devices.

Automated summary

We demonstrate the use of liquid metals as stretchable hermetic seals in soft materials, which are highly permeable to gases. These soft seals are applied in stretchable battery and heat transfer systems involving volatile fluids. The battery shows a capacity retention of approximately 72.5% after 500 cycles, while the sealed heat transfer system exhibits an increased thermal conductivity of around 309 watts per meter-kelvin when strained and heated. In addition, we successfully achieve wireless communication through these seals by incorporating a signal transmission window. This work provides a promising solution for creating stretchable yet hermetic packaging design for soft devices.