From Newsgroup: sci.misc

Concrete "battery" developed at MIT now packs 10 times the power

Improved carbon-cement supercapacitors could turn the concrete around
us into massive energy storage systems.

Concrete already builds our world, and now it's one step closer to
powering it, too. Made by combining cement, water, ultra-fine carbon
black (with nanoscale particles), and electrolytes,
electron-conducting carbon concrete (ec3, pronounced "e-c-cubed")
creates a conductive "nanonetwork" inside concrete that could enable
everyday structures like walls, sidewalks, and bridges to store and
release electrical energy. In other words, the concrete around us
could one day double as giant "batteries."

https://news.mit.edu/2025/concrete-battery-now-packs-ten-times-power-1001

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