MIT researchers have developed a cement-based material that can function as a supercapacitor, potentially allowing for cheap energy storage in homes and infrastructure. This mixture could also enable roads to power electric cars wirelessly or windmills to store energy in their base. The researchers are continuing to experiment with different variations of the material to optimize its energy storage capabilities.

https://futurism.com/the-byte/mit-scientists-create-supercapacitor-storing-energy