Porous NiCo 2 S 4 Nanoneedle Arrays with Highly Efficient Electrocatalysis Anchored on Carbon Cloths as Self-Supported Hosts for High-Loading Li–S Batteries

作者：Tingting Sun, Cheng Huang, Hongbo Shu, Lipan Luo, Qianqian Liang, Manfang Chen, Jincang Su, Xianyou Wang · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.0c20519 · 被引用次数：33 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Supercapacitor Materials and Fabrication

Lithium–sulfur (Li–S) batteries have attracted all-time attention because of their supernormal high energy density and low cost, whereas they are still plagued by the severe polysulfide shuttling and sluggish sulfur redox reaction kinetics. Moreover, poor sulfur electrochemical utilization and rapid capacity degradation are top concerns in the high-loading Li–S batteries, which severely hinder their practical applications. Herein, a completely novel porous nanoneedle array NiCo 2 S 4 electrocatalyst grown on a nitrogen-sulfur-doped carbon cloth (NSCC) (NiCo 2 S 4 @NSCC) is constructed as a 3D self-supported sulfur host for high-loading Li–S batteries, in which the highest sulfur loading reaches 4.9 mg cm –2 . The as-prepared NiCo 2 S 4 @NSCC with a typical sulfur loading of around 2.0 mg cm –2 provides a high discharge capacity of 1223 mA h g –1 at 0.2 C and long-term cycle stability with a low capacity decay of 0.046% per cycle over 500 cycles at 1 C. Additionally, NiCo 2 S 4 @NSCC/S with a high sulfur loading of 4.9 mg cm –2 delivers an excellent reversible areal capacity of 4.4 mA h cm –2 g over 50 cycles. Noting that such superior electrochemical performance of NiCo 2 S 4 @NSCC/S with high-loading sulfur is mainly attributed to high electronic conductivity and the abundant porous structure of NSCC to transport electrons and ions fastly and accommodate sulfur as well as robust absorbability and the outstanding catalytic effect of NiCo 2 S 4 to accelerate the capture and co...