Can you just imagine charging your smartphone in a few seconds or just in a minute charging your laptop? Seems to be impossible, not so far from now. Recent breakthroughs in supercapacitor technology bring it right to our doorstep. Already famed for their rapid charge and discharge, supercapacitors are on the verge of getting a boost to their electronic energy-storing ability. As interesting is the how and what that would enable the change in our very tech gadgets that we use every day.
Very briefly outlined is the working of supercapacitors. While batteries store energy through chemical reactions, supercapacitors carry their energy in an electric field, which is released in much faster charging and discharging. However, historically, they have had below-average energy density, meaning they could not store nearly as much energy in the same space, which had the disadvantage of speed. This limited supercapacitors to more specialty uses in place of batteries for a few applications, in which the timeline for recharging is critical.
Recent research, much of it by the team around Ankur Gupta at the University of Colorado Boulder, has gone a long way in explaining how ions flow through the nanopores of supercapacitors. That is important, for it could lead to supercapacitors that charge quickly but also store more energy.
Now researchers have defined how ions move through a network of nanopores, in a paper published yesterday in the Proceedings of the National Academy of Sciences. One could perhaps think of these nanopores as tiny boulevards down which the ions cruise. And just as an efficient flow of cars along those roads maximizes the gasoline available to store and release energy, ions need to move effectively through those paths. By using Kirchhoff’s laws normally used to describe the behavior of electric current to wrap around ionic transport, they constructed a way of making better predictions for the ionic behavior within an electrochemical supercapacitor.
“The major benefit of supercapacitors is their swiftness”, says Gupta. “Now how do we charge them and release that energy quickly? It is the efficient movement of ions. In essence, what we have shown is something akin to the tuning of fine knobs to amplify the functioning of a supercapacitor across orders of magnitude. That is the leapfrog characteristic of the work. We found the missing link.
This is not some kind of a theoretical breakthrough but a practical one. Quite capable of changing the whole way of storing energy. Soon enough, they will be matching the energy density of lithium-ion batteries and become workable in yet other domains. Imagine electric cars that recharge in just ten minutes, and laptops can power up in only a minute.
The benefits do not stop here. Supercapacitors do have more charge-discharge cycles compared to a battery before their actual capacity begins to fade out. For this case, they prove to be the best ideal solution for applications where rapid load and unloading cycles are evident, as in power tools, electric vehicles, and backup power systems. They could also play a smooth role in grid energy storage, balancing the curve of demand and supply, through the storage of energy from renewable sources—such as solar panels and wind turbines.
Nanoramic Laboratories has also made valuable contributions, coming up with FastCap Ultracapacitors that represent an MIT spinoff using a nanocarbon-based electrode for high performance under the very tough conditions of operation or environment. They can be used at extreme temperatures and high shock/vibration environments, making them suitable for aerospace/military applications.
While this may involve supercapacitors made of biodegradable materials that power flexible electronics even through 3D printing, Gupta’s research laid down the very basics necessary for those inventions to take off by explaining ion flow in nanoporous structures. It is this kind of knowledge that may then lead to such high-speed, efficient, and eco-friendly supercapacitor realization.
Moreover, a world wherein batteries are substituted with supercapacitors will change our perception of tech. Faster charging times translate to less downtime and increased convenience, may these be your devices, vehicles, or even the power grid. Further development in the research conducted by Gupta might turn a day into reality when one wouldn’t even need to remember to charge his/her devices; all it will take is just a flip of the switch.
Hold your seats, tech enthusiasts— SuperCapacitors are here, and it is about to go electrifying.
