Li Pei, Shang Tongxin, Dong Ximan, Li Huan, Tao Ying, Yang Quan-Hong
Nanoyang Group, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China.
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China.
Small. 2021 Dec;17(48):e2007548. doi: 10.1002/smll.202007548. Epub 2021 Mar 8.
Volumetric performance is of great importance in today's energy storage devices, and is used to evaluate their competitiveness in the markets of miniaturized electronic devices and space-constrained electric vehicles. Supercapacitors suffer from a low volumetric energy density in spite of their high power and long cycle life because of their use of porous but low-density carbons. This review considers compact carbon design strategies for high volumetric performance supercapacitors based on four key electrode parameters: density, thickness, gravimetric capacitance, and nonactive components. A guide is provided for constructing a conductive additive-/binder-free self-supported ultrathick, dense electrode to maximize the volumetric energy density. The research status of emerging micro-supercapacitors and hybrid supercapacitors is then briefly discussed, emphasizing the importance of their volumetric performance and the opportunities as well as challenges they face in the trendy Internet of things applications or larger device systems.
体积性能在当今的储能设备中至关重要，用于评估其在小型化电子设备和空间受限的电动汽车市场中的竞争力。超级电容器尽管功率高、循环寿命长，但由于使用多孔但低密度的碳，其体积能量密度较低。本文综述了基于四个关键电极参数（密度、厚度、比电容和非活性成分）的高体积性能超级电容器的紧凑型碳设计策略。为构建无导电添加剂/粘结剂的自支撑超厚、致密电极以最大化体积能量密度提供了指导。然后简要讨论了新兴的微型超级电容器和混合超级电容器的研究现状，强调了它们体积性能的重要性以及它们在物联网应用或更大设备系统中面临的机遇和挑战。
