Flexible materials that discharge electricity when they change their shape after being subject to kinetic pressure and vibration is known as piezoelectrics, which are divided into unwieldy ceramics that generate moderate levels of energy to flexible polymers that generate very little.
Electricity on Rubber Surfaces: A New Energy Conversion Effect
Improved performance of stretchable piezoelectric energy harvester based on stress rearrangement
How Much Energy Can You Store in a Rubber Band?
Electricity on Rubber Surfaces: A New Energy Conversion Effect
Scientist Develop Flexible Energy-Harvesting Rubber Sheets
Rubber Band Potential Energy Science Experiment - Frugal Fun For Boys and Girls
Full article: Stretchable electronics: functional materials, fabrication strategies and applications
A flexible material that generates electricity when stressed
Rubber-Cal Closed Cell Sponge Rubber Neoprene 1 in. x 39 in. x 78 in. Black Foam Rubber Sheet 02-128-1000 - The Home Depot
Rubber-Cal Corrugated Fine Rib 1/8 in. x 4 ft. x 15 ft. Rubber Runner 03_168_W_FR_15 - The Home Depot