Unlike batteries, which rely on materials in limited supply, the technology could be produced cheaply using materials that are readily available. Possible to charge electric cars while they are travelling across it.
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From the article, it seems more like a capacitor than an actual battery. While it would still have its uses, such as smoothing out surges and dips in power demand, you won’t see anything powered by these any tume soon.
Plus I’m curious as to the energy density. High energy density capacitors can already be made via other cheap materials.