Shashank Priya of Virginia Tech in Blacksburg and colleagues are currently working on a battery that allows users to generate electricity after sounding or touching the keyboard, or even simply shaking.
Researchers have experimented with zinc oxide, a conventional piezoelectric material, to observe its effect of converting vibration and pressure waves into electricity. The experimenter generated about 50 millivolts of electricity by making a 100 dB sonic vibration. In mobile phones, piezoelectric materials will be mounted on the lower part of the keyboard to convert mechanical vibrations into electrical energy for storage.
"It doesn't generate a lot of electricity, big enough to keep the phone running, but at least it can be used as emergency power," Priya said. “In an emergency, you only need to shake your phone for a few minutes to get the power to maintain an important call.â€
In addition, the team recently installed a miniature wind turbine into a container similar to a bottle. When the external wind reaches 8-10 km/h, the device can generate 1 watt of electricity, if it is connected via a USB cable. If the mobile phone is connected, the phone can be charged in 45 to one and a half hours under normal conditions.
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