It's not a capacitor, but it's interesting. EV Battery Breakthrough: Twice The Range, Five Minutes To Charge The amount of research being done into better batteries for electric cars is perhaps the clearest indication of how high the stakes are in the car world. Breakthrough after breakthrough comes from labs around the world, and the latest is among the most impressive: a new anode material that can increase a battery’s range twofold while greatly accelerating charging times. The news comes from the Center for Energy Storage Research at the Korea Institute of Science and Technology. A team of scientists from the center succeeded in developing a silicon anode to replace the graphite used currently in EV batteries, greatly improving their performance. Silicone is not a new material for the battery-making industry. It has a much greater energy storage capacity than graphite—ten times as much, according to the news release of the KIST—but it is a lot less stable than graphite. This means that silicone, unlike graphite, expands and shrinks quickly during charge-discharge cycles, which affects that impressive storage capacity and shortens the life of the battery. The KIST researchers solved this problem by drying the material. Literally. They mixed silicone and corn starch with water and then heated the mixture up using “a simple thermal process used for frying food” to seal the result, which was a carbon silicone compound. The compound has displayed four times the energy storage capacity of graphite anodes. It has also made it possible to charge an EV battery to 80 percent in just five minutes. And it’s eco-friendly. more.... https://www.yahoo.com/finance/news/ev-battery-breakthrough-twice-range-220000749.html