Reporters learned from Nanjing University of Aeronautics and Astronautics that Professor Li Weiwei of the university, together with Academician Nan Ce Wen of Tsinghua University and others, have jointly developed a new type of dielectric energy storage material, which has an energy density dozens to hundreds of times higher than that of mainstream commercial dielectric energy storage materials, and is expected to become the core device of the next-generation high-power pulse technology. The related results were published online in the international top academic journal "Science" on April 11.
Li Weiwei introduced that dielectric energy storage capacitors are everywhere in life. They can release energy instantly and are true "power multipliers". From integrated circuit boards and cardiac defibrillators to new energy vehicles and wind power stations, they all have their presence.
Currently, limited by the electrochemical properties of traditional materials, mainstream commercial capacitors face a contradiction between power density and energy density. "That means that although their power density is high, their energy density is low and they are prone to breakdown. We wanted to study a new material with both high power density and energy density, which could ensure safety while achieving fast charging and discharging," said Li Weiwei.
After more than three years of exploration, the research team designed a dendritic nano-composite structure and developed a new dielectric energy storage material sample with a side length of 5 millimeters. It has several energy storage units distributed on it, each with a diameter of 30 micrometers. In the experiment, the sample discharged instantly in just 3.3 microseconds, and its charge-discharge cycle reached 10 billion times. It can still work stably in an environment ranging from -100°C to +170°C.
"More importantly, the energy density of the sample reaches 215.8 joules per cubic centimeter, while the energy density of mainstream commercial capacitors is only 1.2 to 5 joules per cubic centimeter," said Li Weiwei. He also mentioned that the next step for the team is to develop larger silicon-based capacitors, steadily moving towards the goal of industrialization. (Reporter Chen Xi Yuan)
Original article: https://www.toutiao.com/article/7491877858722415104/
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