14November2019

Nano-Micro Letters

Construction of Electrocatalytic and Heat-Resistance Self-Supporting Electrodes for High-Performance Lithium-Sulfur Batteries

Xuemei Zhang1, +, Yunhong Wei1, +, Boya Wang2, Mei Wang2, Yun Zhang2, *, Qian Wang 2, Hao Wu1, *

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Nano-Micro Lett. (2019) 11: 78

First Online: 18 September 2019 (Article)

DOI:10.1007/s40820-019-0313-x

*Corresponding author. E-mail: y_zhang@scu.edu.cn (Yun Zhang); hao.wu@scu.edu.cn (Hao Wu)

 

Abstract

 


Toc

Boosting the utilization efficiency of sulfur electrodes and suppressing the “shuttle effect” of intermediate polysulfides remain the critical challenge for high-performance lithium–sulfur batteries (LSBs). However, most of reported sulfur electrodes are not competent to realize the fast conversion of polysulfides into insoluble lithium sulfides when applied with high sulfur loading, as well as to mitigate the more serious shuttle effect of polysulfides, especially when worked at an elevated temperature. Herein, we reported a unique structural engineering strategy of crafting a unique hierarchical multifunctional electrode architecture constructed by rooting MOF-derived CoS2/carbon nanoleaf arrays (CoS2–CNA) into a nitrogen-rich 3D conductive scaffold (CTNF@CoS2–CNA) for LSBs. An accelerated electrocatalytic effect and improved polysulfide redox kinetics arising from CoS2–CNA were investigated. Besides, the strong capillarity effect and chemisorption of CTNF@CoS2–CNA to polysulfides enable high loading and efficient utilization of sulfur, thus leading to high-performance LIBs performed not only at room temperature but also up to an elevated temperature (55 °C). Even with the ultrahigh sulfur loading of 7.19 mg cm−2, the CTNF@CoS2–CNA/S cathode still exhibits high rate capacity at 55 °C.


 

Keywords

Metal organic framework; Lithium-sulfur batteries; Cobalt sulfide; Heat-resistant; N-doped carbon foam

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