Abstract：In order to meet the flexibility transformation requirements of thermal power units under the “dual carbon” goal, this paper designs and develops a high-energy density lithium-ion supercapacitor monomer to address the bottleneck problems of insufficient frequency response rate of traditional lithium-ion batteries and limited energy density of supercapacitors. A supercapacitor unit with a rated capacity of 17 000 F, energy density of 90 W∙h/kg, and power density of 10 kW/kg is developed by using a hybrid energy storage mechanism of hard carbon negative electrode/activated carbon positive electrode. According to QC/T 741—2014 standard testing, the monomer maintains a capacity retention rate of 83.2% in the temperature range of -20~55℃. After 50 000 cycles, the capacity decay rate is only 16.8%. After 1 000 hours of high-temperature aging, the capacity remains at 87.3%. When applied to a 5 MW supercapacitor +15 MW lithium-ion hybrid frequency regulation system, the frequency regulation performance index is improved by 60% compared to traditional coal-fired units, and the full life cycle cost is lower than that of pure lithium battery solutions. Research has shown that this high- energy-density supercapacitor unit effectively solves the prominent contradiction between high power demand and equipment lifespan in thermal power frequency regulation scenarios through its “second level response + ten thousand cycles” characteristics.
党国举, 徐文浩, 兀鹏越, 郑昀, 邱逢涛. 高能量密度超级电容器单体设计与制备及其在火电调频中的应用[J]. 电气技术, 2025, 26(9): 21-27.
DANG Guoju, XU Wenhao, WU Pengyue, ZHENG Yun, QIU Fengtao. Design and preparation of high-performance supercapacitor units and their application in thermal power frequency regulation. Electrical Engineering, 2025, 26(9): 21-27.
2025, Vol. 26 
