Scientists from Chalmers University of Technology in Sweden have proposed using concrete buildings as giant batteries. During previous research, they managed to develop the world's first cement-based rechargeable battery concept.
The main material for such a battery is a cement-based mixture with a small amount of carbon fibers. A carbon fiber mesh with a metal coating (iron for the anode and nickel for the cathode) is installed inside. The average energy density of a cement battery is 7 watts per square meter. This is about ten times higher than previous models. It is much lower than "standard" batteries, but according to scientists, this shortcoming can be largely corrected. It is important that the battery is rechargeable. According to the creators, with its help it will be possible to power LEDs, provide 4G connection in remote areas or cathodic protection against corrosion in concrete buildings.
Scientists noted that in modern times, most of the buildings and infrastructure facilities are made of concrete. If you apply an electrode layer to them (and this can be done for almost any concrete surface), then the object can acquire a new important function. However, the project is still under development. Scientists note that the service life of concrete structures is 50-100 years, while batteries serve less. In order for their idea to become a reality, it is necessary to think about how to extend their service life.
