LR521 battery.Beijing's key R&D plan project "Development of high specific energy supercapacitors for electric vehicles" passed the acceptance inspection

　　Under the leadership of researcher Ma Yanwei, after two years of technical research, the research team developed key materials such as high specific capacity activated carbon materials, high rate negative electrode material systems, graphene composite materials, etc., combined with advanced perforated current collector non-destructive coating technology and negative electrode Controlled pre-lithium insertion technology and other technologies have successfully developed all-carbon lithium-ion capacitor cells with high energy density and high power density. According to third-party testing by the Light Industry Chemical Power Source Research Institute, the actual capacity of the capacitor unit is 2350F, the energy density based on the entire unit mass reaches 33.6Wh/kg, the power density reaches 5.2kW/kg, and the capacity retention rate after 10,000 cycles is 95.2%. Above, the capacity retention rate is 89% at -20°C, and is assembled into a lithium-ion capacitor module with a capacity of 7.5Ah and a rated voltage of 64V. It is used in the first demonstration vehicle in China that uses an all-carbon lithium-ion capacitor as the sole power source. tour car. The expert group fully affirmed and spoke highly of the results achieved by the project, saying, "The relevant technical indicators are at the leading level in the country, and a supercapacitor pilot production platform has been built. It has the ability to produce soft-packaged lithium-ion capacitors in batches. Soft-packed supercapacitors can form The module has been used in small sightseeing car demonstrations and is of great significance in promoting the application of supercapacitors in electric vehicles." Experts unanimously believe that the technical indicators of the undertaking unit have fully met the assessment indicator requirements stipulated in the project mission statement, and agree to the project pass the inspection. The project acceptance expert group consists of five experts: Professor Qian Weizhong of Tsinghua University, Professor Zhou Henghui of Peking University, Professor Yang Wensheng of Beijing University of Chemical Technology, Researcher Hu Yongsheng of the Institute of Physics, Chinese Academy of Sciences, and Professor Wu Chuan of Beijing Institute of Technology.

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