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According to foreign media reports, researchers at University College London in the United Kingdom have developed a supercapacitor. Although it is still in the stage of proof of concept, it still shows great potential. It can be used as a portable power supply for electric vehicles, mobile phones and Wearable technology, etc. This capacitor solves the problem faced by high-power, fast-charging supercapacitors, that is, they usually cannot store a large amount of energy in a small space.
The researchers said: "The material we designed can make the supercapacitor have high power density (determining the speed of its charging and discharging) and high energy density (determining how long it can run). Normally, the supercapacitor only has the above two characteristics One, but this supercapacitor has these two characteristics and is a major breakthrough. "" In addition, the supercapacitor can be bent 180 degrees without affecting performance, and no liquid electrolyte is used, thereby minimizing the risk of explosion. It can be perfectly integrated into flexible mobile phones or wearable electronics. "
The research team is composed of chemists, engineers and physicists. It is using an innovative graphene electrode material to design new supercapacitors. The pores of this material can be changed to store charge more effectively, thus the supercapacitor ’s The energy density reached a record 88.1 Wh / L, which is also the carbon-based supercapacitor with the highest energy density in history.
The energy density of similar fast charging commercial technologies is relatively low, 5-8 Wh / L, while the energy density of traditional slow-charging but long-running electric vehicle lead-acid batteries is usually 50-90 Wh / L. Although the energy density of the supercapacitor developed by the research team is comparable to the most advanced lead-acid batteries, its power density is two orders of magnitude higher than that of lead-acid batteries, reaching 10,000 W / L.
Ivan Parkin, Dean of the Department of Mathematics and Physical Sciences and Professor of Chemistry at University College London, said: "Successfully storing large amounts of energy in a compact system is an important step towards improving energy storage technology. We showed this super Capacitors charge fast, control their energy input, and have good durability and flexibility. They are ideal for research and development of miniaturized electronic products and electric vehicles. Imagine that it takes only 10 minutes to fully charge an electric vehicle, or just It takes a few minutes to fully charge the phone, and then you can continue to use the phone for a day. "
The researchers used multiple layers of graphene as electrodes to create a dense but porous material capable of capturing charged ions of different sizes. They used various techniques to describe the characteristics of the material, and found that when the gap size matches the diameter of the ions in the electrolyte, the material has the best performance. The optimized material forms a thin film and is used to create a proof-of-concept device with both high power and high energy density.
This supercapacitor is 6cm × 6cm in size and is made of two identical electrodes. The electrodes are layered on both sides of the gel-like substance, and the gel-like substance can act as a chemical medium for transferring charge. When the supercapacitor was used to power dozens of LED lights, it was found to have strong flexibility and stability.
Even if the supercapacitor is bent 180 degrees, its performance is the same as when it is almost not bent. After 5000 charge and discharge cycles, the capacity remains at 97.8%. (Yu Qiuyun)
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