While at the proof-of-concept stage, this new bendable graphene-based supercapacitor shows enormous potential as a portable power supply in several practical applications including electric vehicles, phones, and wearable technology.\n\nThe discovery, published today (February 17, 2020) in Nature Energy, overcomes the issue faced by high-powered, fast-charging supercapacitors \u2014 that they usually cannot hold a large amount of energy in a small space.\n\nFirst author of the study, Dr. Zhuangnan Li (UCL Chemistry), said: \u201cOur new supercapacitor is extremely promising for next-generation energy storage technology as either a replacement for current battery technology, or for use alongside it, to provide the user with more power.\n\n\u201cWe designed materials which would give our supercapacitor a high power density \u2014 that is how fast it can charge or discharge \u2014 and a high energy density \u2014 which will determine how long it can run for. Normally, you can only have one of these characteristics but our supercapacitor provides both, which is a critical breakthrough.\n\n\u201cMoreover, the supercapacitor can bend to 180 degrees without affecting performance and doesn\u2019t use a liquid electrolyte, which minimizes any risk of explosion and makes it perfect for integrating into bendy phones or wearable electronics.\u201d <\/p>\n\n\n\n
A team of chemists, engineers and physicists worked on the new design, which uses an innovative graphene electrode material with pores that can be changed in size to store the charge more efficiently. This tuning maximizes the energy density of the supercapacitor to a record 88.1 Wh\/L (Watt-hour per liter), which is the highest ever reported energy density for carbon-based supercapacitors.\n\nSimilar fast-charging commercial technology has a relatively poor energy density of 5-8 Wh\/L and traditional slow-charging but long-running lead-acid batteries used in electric vehicles typically have 50-90 Wh\/L.\n\nWhile the supercapacitor developed by the team has a comparable energy density to state-of-the-art value of lead-acid batteries, its power density is two orders of magnitude higher at over 10,000 Watt per liter.\n\nSenior author and Dean of UCL Mathematical & Physical Sciences, Professor Ivan Parkin (UCL Chemistry), said: \u201cSuccessfully storing a huge amount of energy safely in a compact system is a significant step towards improved energy storage technology. We have shown it charges quickly, we can control its output and it has excellent durability and flexibility, making it ideal for development for use in miniaturized electronics and electric vehicles. Imagine needing only ten minutes to fully-charge your electric car or a couple of minutes for your phone and it lasting all day.\u201d\n\nThe researchers made electrodes from multiple layers of graphene, creating a dense, but porous material capable of trapping charged ions of different sizes. They characterized it using a range of techniques and found it performed best when the pore sizes matched the diameter of the ions in the electrolyte.\n\nThe optimized material, which forms a thin film, was used to build a proof-of-concept device with both a high power and high energy density.\n\nThe 6cm x 6cm supercapacitor was made from two identical electrodes layered either side of a gel-like substance which acted as a chemical medium for the transfer of electrical charge. This was used to power dozens of light-emitting diodes (LEDs) and was found to be highly robust, flexible and stable.\n\nEven when bent at 180 degrees, it performed almost the same as when it was flat, and after 5,000 cycles, it retained 97.8% of its capacity.\n\nSenior author, Professor Feng Li (Chinese Academy of Sciences), said: \u201cOver the next thirty years, the world of intelligent technology will accelerate, which will greatly change communication, transportation and our daily lives. By making energy storage smarter, devices will become invisible to us by working automatically and interactively with appliances. Our smart cells are a great example of how the user experience might be improved and they show enormous potential as portable power supply in future applications.\u201d<\/p>\n\n\n\n
Reference: \u201cTuning the interlayer spacing of graphene laminate films for efficient pore utilization towards compact capacitive energy storage\u201d by Zhuangnan Li, Srinivas Gadipelli, Hucheng Li, Christopher A. Howard, Dan J. L. Brett, Paul R. Shearing, Zhengxiao Guo, Ivan P. Parkin and Feng Li, 17 February 2020, Nature Energy.<\/p>","protected":false},"excerpt":{"rendered":"
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