Flexible composite materials preparation and structure design for stretchable flexible energy storage battery: Recent progress, challenges and perspective

With the development of smart wearable devices in the fields of human-computer interaction, medical diagnosis, health monitoring, etc., smart electronic devices are rapidly developing in the direction of flexibility, miniaturization and comfort. stretchable battery is widely recognized as an ideal stretchable energy storage system . In this work, the latest development trends of stretchable energy storage batteries were analyzed from three aspects: ①preparation schemes of stretchable electrodes and electrolytes, and battery structure design, ②electrochemical performance of batteries under strain and stability during stretching cycles, and ③packaging materials with both stretchability and sealing properties. In addition, the advantages and disadvantages of different strategies for achieving battery stretchability were evaluated from the perspectives of battery equipment stretchability and component stretchability. finally, the current challenges faced by stretchable energy storage batteries were analyzed, and their future development directions were pointed out.