Dan Jiacheng, Zhou Wei, Chen Minzhe, Zhu Chuheng, Li Sicheng, Zhao Dengke, Li Ligui, An Maozhong
New Energy Research Institute, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
School of Materials Science and Engineering, Henan Normal University, Xinxiang 453007, China.
J Colloid Interface Sci. 2023 Jun 15;640:877-889. doi: 10.1016/j.jcis.2023.02.144. Epub 2023 Mar 2.
Exploring advanced sulfur cathode materials with high catalytic activity to accelerate the slow redox reactions of lithium polysulfides (LiPSs) is of great significance for lithium-sulfur batteries (LSBs). In this study, a coral-like hybrid composed of cobalt nanoparticle-embedded N-doped carbon nanotubes supported by Vanadium (III) oxide (VO) nanorods (Co-CNTs/C @VO) was designed as an efficient sulfur host using a simple annealing process. Characterization combined with electrochemical analysis confirmed that the VO nanorods exhibited enhanced LiPSs adsorption capacity, and the in situ grown short-length Co-CNTs improved electron/mass transport and enhanced the catalytic activity for conversion to LiPSs. Owing to these merits, the S@Co-CNTs/C@VO cathode exhibits effective capacity and cycle lifetime. Its initial capacity was 864 mAh g at 1.0C and remained at 594 mAh g after 800cycles with a decay rate of 0.039%. Furthermore, even at a high sulfur loading (4.5 mg cm), S@Co-CNTs/C@VO also shows acceptable initial capacity of 880 mAh g at 0.5C. This study provides new ideas for preparing long-cycle S-hosting cathodes for LSBs.
探索具有高催化活性的先进硫阴极材料以加速多硫化锂（LiPSs）的缓慢氧化还原反应对锂硫电池（LSBs）具有重要意义。在本研究中，通过简单的退火工艺设计了一种由嵌入钴纳米颗粒的氮掺杂碳纳米管组成的珊瑚状杂化物，该杂化物由氧化钒（VO）纳米棒（Co-CNTs/C@VO）支撑，作为一种高效的硫宿主。表征与电化学分析相结合证实，VO纳米棒表现出增强的LiPSs吸附能力，原位生长的短长度Co-CNTs改善了电子/质量传输并增强了转化为LiPSs的催化活性。由于这些优点，S@Co-CNTs/C@VO阴极表现出有效的容量和循环寿命。其在1.0C时的初始容量为864 mAh g，800次循环后保持在594 mAh g，衰减率为0.039%。此外，即使在高硫负载（4.5 mg cm）下，S@Co-CNTs/C@VO在0.5C时也显示出880 mAh g的可接受初始容量。本研究为制备用于LSBs的长循环硫宿主阴极提供了新思路。
