Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Rd, Hangzhou, 310027, China.
Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
Angew Chem Int Ed Engl. 2017 May 22;56(22):6176-6180. doi: 10.1002/anie.201700686. Epub 2017 Mar 22.
Rational design of cathode hosts with high electrical conductivity and strong sulfur confinement is a great need for high-performance lithium-sulfur batteries. Herein, we report a self-standing, hybrid-nanostructured cathode host comprised of metal-organic framework (MOF)-derived porous carbon polyhedrons and carbon nanotubes (CNTs) for the significant improvement of both the electrode cyclability and energy density. The strong coupling of the intertwined CNTs and strung porous carbon polyhedrons as a binder-free thin film significantly enhances the long-range electronic conductivity and provides abundant active interfaces as well as robust electrode integrity for sulfur electrochemistry. Attributed to the synergistic combination of the CNTs and carbon polyhedrons, the obtained sulfur electrodes exhibit outstanding cyclability, an excellent high-rate response up to 10 C, and an ultra-high volumetric capacity of 960 Ah L .
合理设计具有高导电性和强硫约束能力的阴极宿主对于高性能锂硫电池来说是非常必要的。在此，我们报告了一种自支撑的混合纳米结构阴极宿主，由金属有机骨架（MOF）衍生的多孔碳多面体和碳纳米管（CNT）组成，可显著提高电极的循环稳定性和能量密度。交织的 CNTs 和串状多孔碳多面体的强耦合作为无粘结剂的薄膜显著提高了长程电子导电性，并为硫电化学提供了丰富的活性界面和坚固的电极完整性。由于 CNTs 和碳多面体的协同组合，所得到的硫电极表现出优异的循环稳定性、高达 10C 的优异高速率响应以及超高的体积容量 960 Ah L -1 。
