Swiss scientists develop stretchable polymer electrolyte for batteries

Swiss researchers at Empa’s Laboratory for Functional Polymers have developed a novel silicone-based stretchable polymer electrolyte aimed at improving solid-state batteries. Unlike conventional rigid solid electrolytes, this new material is soft and elastic, making it suitable for flexible battery applications, including medical devices such as pacemakers. The team overcame a key challenge—silicone’s natural nonpolar nature, which prevents ion conduction—by chemically modifying the polymer backbone with functional groups to enable efficient ion transport while maintaining elasticity. The stretchable electrolyte is currently being tested in various battery prototypes, including button cells, with potential for flexible batteries when paired with appropriate electrode materials. Beyond flexibility and safety, the material can be processed into thin films just a few micrometers thick, is scalable for industrial production, and is expected to be more cost-effective than conventional solid polymer electrolytes. The researchers are focusing on further enhancing ionic conductivity and seeking industrial partners to commercialize the technology. This innovation contributes to the broader advantages of solid-state batteries,