Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Department of Hydrogen Energy Materials, Surface & Nano Materials Division, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 51508, Republic of Korea.
ACS Appl Mater Interfaces. 2023 May 31;15(21):25484-25494. doi: 10.1021/acsami.3c02492. Epub 2023 May 18.
The increasing demands for conversion systems for clean energy, wearable devices powered by energy storage systems, and electric vehicles have greatly promoted the development of innovative current collectors to replace conventional metal-based foils, including those in multidimensional forms. In this study, carbon nanotubes (CNTs) with desirable features and ease of processing are used in the preparation of floating catalyst-chemical vapor deposition-derived CNT sheets for potential use as all-around current collectors in two representative energy storage devices: batteries and electrochemical capacitors. Due to their short and multidirectional electron pathways and multimodal porous structures, CNT-based current collectors enhance ion transport kinetics and provide many ion adsorption and desorption sites, which are crucial for improving the performance of batteries and electrochemical capacitors, respectively. By assembling activated carbon-CNT cathodes and prelithiated graphite-CNT anodes, high-performance lithium-ion hybrid capacitors (LIHCs) are successfully demonstrated. Briefly, CNT-based LIHCs exhibit 170% larger volumetric capacities, 24% faster rate capabilities, and 21% enhanced cycling stabilities relative to LIHCs based on conventional metallic current collectors. Therefore, CNT-based current collectors are the most promising candidates for replacing currently used metallic materials and provide a valuable opportunity to possibly redefine the roles of current collectors.
对清洁能源转换系统、由储能系统供电的可穿戴设备以及电动汽车的需求不断增加，极大地推动了创新集流器的发展，以取代传统的基于金属的箔片，包括那些多维形式的箔片。在这项研究中，使用具有理想特性和易于加工的碳纳米管（CNTs）来制备浮催化剂化学气相沉积衍生的 CNT 片，以潜在用作两种代表性储能设备（电池和电化学电容器）的全方位集流器。由于其短的和多方向的电子路径以及多模态多孔结构，基于 CNT 的集流器增强了离子输运动力学，并提供了许多离子吸附和脱附位点，这对于分别提高电池和电化学电容器的性能至关重要。通过组装活性炭-CNT 阴极和预锂化石墨-CNT 阳极，成功地演示了高性能锂离子混合电容器（LIHC）。简而言之，与基于传统金属集流器的 LIHC 相比，基于 CNT 的 LIHC 具有 170%更大的体积容量、24%更快的倍率性能和 21%增强的循环稳定性。因此，基于 CNT 的集流器是最有前途的替代当前使用的金属材料的候选者，并为重新定义集流器的作用提供了一个有价值的机会。
