At McGill University in Canada, researchers have developed a flexible, fully biodegradable battery that could become a new standard for wearable electronics and medical implants. The device is made from gelatin, magnesium, molybdenum and natural acids, without heavy metals.
The kirigami technique — cutting along a geometric pattern inspired by Japanese art — allowed the battery to stretch by up to 80% without losing power. In experiments, it steadily delivered 1.3 volts, on a par with a standard AA battery. The researchers paid particular attention to eliminating heavy metals. Earlier biodegradable batteries suffered from a loss of conductivity because a protective layer formed on the surface of the metals. Here, that problem was solved with citric and lactic acids, which protect the metal and extend the battery’s service life.
The scientists plan to miniaturize the battery and use it in implantable medical devices. The development could significantly reduce electronic waste and open up new possibilities in eco-friendly electronics. This is especially relevant against the backdrop of the global e-waste problem, as such waste is often not recycled and is exported to developing countries.
