Scientists have engineered a tiny, edible battery that can power swallowable electronic medical devices and then dissolve harmlessly in the digestive tract. The prototype, which resembles a rice‑paper wrapper, was evaluated in live pigs and shown to operate an RFID transmitter and a stomach‑stimulating unit that influences hunger‑regulating hormones.
Design focused on safety and biocompatibility
Traditional batteries pose risks when incorporated into ingestible or implantable devices because they often contain toxic metals, organic electrolytes and plastic casings that can cause chemical burns or release harmful substances if a device fails. To avoid these hazards, the research team, led by mechanical engineer Giovanni Traverso of the Massachusetts Institute of Technology, selected only materials that the body already tolerates in trace amounts.
The battery’s electrodes are made from magnesium and molybdenum trioxide, both essential micronutrients. When paired, they generate a voltage sufficient to run low‑power electronics. Instead of a conventional liquid electrolyte, the team used a biodegradable ionic liquid that degrades without leaving harmful residues. The outer coating consists of a cellulose‑based film inspired by edible rice‑paper candy wrappers; this film dissolves gradually in gastric fluid. A thin layer of beeswax was applied to the coating to moderate the rapid action of stomach acid.
Laboratory and animal testing confirmed performance
In simulated gastric fluid, the batteries began to break apart after roughly two weeks and were completely dissolved after several months, indicating a predictable degradation timeline. For functional testing, the researchers placed the batteries inside gelatin capsules along with fully biodegradable electronics. In one capsule, an RFID tag transmitted data to an external reader, demonstrating reliable communication from inside the animal’s body. In a second experiment, an endoscopically positioned device delivered electrical pulses to the stomach wall, which provoked a measurable rise in ghrelin, the hormone that stimulates appetite.
Both experiments were conducted in pigs, a model commonly used for gastrointestinal studies because of its physiological similarity to humans. The successful transmission of RFID signals and the hormonal response to electrical stimulation suggest that the battery can supply sufficient power for short‑term diagnostic or therapeutic functions.
Implications for future ingestible and implantable therapies
The development of a fully biodegradable, non‑toxic power source opens new avenues for “electroceutical” approaches that aim to modulate the gut‑brain axis without invasive surgery. Devices powered by such batteries could monitor physiological parameters, deliver targeted drug releases, or provide neuromodulation to treat metabolic disorders, potentially offering a less invasive alternative to bariatric surgery or permanent implants.
Findings from the study were published in the journal Nature Chemical Engineering, underscoring the interdisciplinary effort that combined materials science, mechanical engineering and gastroenterology to address a longstanding safety concern in ingestible medical technology.
Mitchell Landsberg is a Senior Technology Correspondent at News Raise. He covers consumer electronics, artificial intelligence, software developments, and digital privacy trends.
