The Battery in Your Wall: How VinUniversity Researchers Are Turning Dead Batteries into Stronger Buildings

Every year, billions of Zinc-Carbon batteries are thrown away. The metals get some attention, but the carbon-rich black mass inside — the part nobody wants — goes straight to landfill, quietly leaching zinc and manganese into soil and groundwater. Researchers at VinUniversity’s Digital Materials Science Laboratory, part of the Center for Environmental Intelligence (CEI), decided that waste deserved a second life. They collected spent batteries on campus, dismantled them by hand, and extracted two materials: graphene sheets and carbon black nanoparticles. Both were then mixed into cement. The results, published in Resources, Conservation & Recycling, were striking—cement strength improved by up to 34.5%, while embodied carbon and cost per unit strength dropped by around 22%. The materials worked by filling microscopic pores and accelerating cement hydration, producing a denser, stronger matrix. No rare elements, no expensive processes—just smarter thinking about what we usually throw away.

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