Flexible battery recharged by human sweat. Free Technical Library News

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Flexible battery recharged by human sweat

22.08.2021

Scientists around the world are constantly working on the creation of original methods for recharging wearable mobile gadgets. An unusual way to replenish battery energy using human sweat was proposed by specialists from NTU Singapore University.

The experimental flexible elastic battery measuring 2 by 2 cm has a flat shape, can be attached to a fabric that collects sweat, and quickly connects to any mobile gadgets, including smart watches, medical sensors and other devices.

During testing, a volunteer fastened an elastic battery on his wrist and rode a bicycle for 30 minutes. During the experiment, the element generated a voltage of 4,2 V at a power of 3,9 mW, which allows you to feed the temperature sensor and provide data transfer from the sensor to a smartphone via Bluetooth. The battery does not contain harmful or corrosive materials that are harmful to human health or the environment.

New batteries are able to support the autonomous operation of any wearable gadgets using the energy generated by the human body. At the same time, there is no danger of environmental contamination with harmful elements that are present in almost all modern batteries.

NTU's invention is based on a printer ink that contains silver flakes and hydrophilic polyurethane acrylate (HPUA). When the silver flakes come into contact with human sweat, the chloride ions and the increased acidity of the sweat initiate a chemical reaction during which the flakes combine to increase electrical conductivity and also generate an electric current between the electrodes.

The flexible battery uses a textile fabric capable of accumulating human sweat, which provides the battery with the ability to generate electricity even when a person is at rest and does not sweat. Also, according to the developers, the new battery has a longer life than modern batteries.

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