Pang Zhiyuan, Ma Yue, Zhou Ying, Miao Xinyu, Kong Linglong, Song Dawei, Shi Xixi, Zhang Hongzhou, Zhang Lianqi
Tianjin Key Laboratory for Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, College of Environmental Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Langmuir. 2021 Apr 6;37(13):4016-4024. doi: 10.1021/acs.langmuir.1c00337. Epub 2021 Mar 24.
The lithium-sulfur (Li-S) battery is an ideal electrochemical energy storage system owing to the high theoretical energy density and acceptable cost of finance and the environment. However, some disadvantages, including low electrical conductivity, poor sulfur utilization, and rapid capacity fading, obstruct its practical application. In this work, 3D carbon foam from a melamine resin is synthesized via high-temperature calcination. Carbon nanotubes (CNTs) and MnO are utilized to tailor the properties of the 3D cathode collector in the liquid LiS-containing Li-S battery without additional conductive agents, binders, and aluminum foil. Herein, the decorated MnO on the carbon fiber foam prolongs the lifespan of the Li-S battery, and adding CNTs is beneficial to enhance the capacity and cyclic performance of the Li-S battery under high sulfur loading. The Li-S battery with a sulfur loading of 3 mg cm possesses a reversible capacity of 437.9 mA h g after 400 cycles at 0.1 C. The capacity could be maintained at 568 mA h g at 0.1 C after 80 cycles when the sulfur loading increases to 6 mg cm.
锂硫（Li-S）电池因其高理论能量密度以及在经济和环境方面可接受的成本，是一种理想的电化学储能系统。然而，一些缺点，包括低电导率、硫利用率低和快速容量衰减，阻碍了其实际应用。在这项工作中，通过高温煅烧合成了来自三聚氰胺树脂的三维碳泡沫。在不含额外导电剂、粘结剂和铝箔的含硫液体锂硫电池中，利用碳纳米管（CNTs）和MnO来调整三维阴极集流体的性能。在此，碳纤维泡沫上修饰的MnO延长了锂硫电池的寿命，并且添加CNTs有利于在高硫负载下提高锂硫电池的容量和循环性能。硫负载为3 mg cm的锂硫电池在0.1 C下循环400次后具有437.9 mA h g的可逆容量。当硫负载增加到6 mg cm时，在0.1 C下循环80次后容量可维持在568 mA h g。
