Stretchable, biodegradable battery could power wearables, medical implants
Researchers at McGill University have come up with a new battery that's both stretchable and biodegradable—perfect for powering wearables and medical implants.
It's made from gelatin mixed with magnesium and molybdenum electrodes, plus a splash of citric or lactic acid to boost voltage and lifespan.
The design takes inspiration from those classic lemon battery experiments.
Flexible, reliable power for next-gen devices
Thanks to a clever kirigami-inspired pattern and soft gelatin electrolyte, the battery can stretch up to 80% without losing power.
It delivers about 1.3 volts—just under what an AA battery does—and was able to run a wearable pressure sensor smoothly.
Designed to disappear (and help the planet)
Unlike regular batteries that stick around as waste, this one breaks down in a phosphate-buffered saline solution within two months (except for the molybdenum, which takes longer).
It's a safer option for the environment and could help reduce e-waste from gadgets.
The team is now looking for partners to make these batteries even smaller and pair them with biodegradable circuits.