Say you need to charge your cellphone, but you are in the middle of nowhere. Well, if you had a wearable battery that recharges from your movement, it would be no problem at all. That day is coming. Researchers at Georgia Tech have come up with a way to recharge a lithium-ion coin-sized battery inside the sole of a shoe.
The usual dividers between electrodes have been replaced with a polyvinylidene difluoride film that uses piezoelectrics to recharge the battery by adding pressure to that small gap. You don’t need any outside voltage, which means that your own movement creates the pressure required to recharge the cell.
It will be pretty cool to be charging our batteries like this one day soon. They just have to perfect this technology first.