From: here@is.invalid   
      
   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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