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Rational Fabrication of Nitrogen and Sulfur Codoped Carbon Nanotubes/MoS 2 for High‐Performance Lithium–Sulfur Batteries
Author(s) -
Xiang Kaixiong,
Wen Xiaoyu,
Hu Jun,
Wang Sicheng,
Chen Han
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900929
Subject(s) - polysulfide , electrocatalyst , sulfur , materials science , molybdenum disulfide , lithium (medication) , chemical engineering , nanotechnology , carbon nanotube , redox , electrode , inorganic chemistry , chemistry , electrochemistry , medicine , engineering , electrolyte , metallurgy , endocrinology
Lithium–sulfur batteries are more promising and attractive than lithium‐ion batteries owing to a higher charge‐storage capacity. However, their commercial applications are hindered by an undesirable polysulfide shuttling effect during the cycling procedure. Herein, nitrogen and sulfur codoped carbon nanotubes intertwined with flower‐like molybdenum disulfide (NSCNTs/MoS 2 ) were synthesized by using a feasible hydrothermal method and used as effective lithium polysulfides (LiPSs) tamers. The NSCNTs/MoS 2 had a strong hybrid structure with strong interfacial interactions for physical confinement, chemical adsorption, and electrocatalytic conversion of intermediate LiPSs during the charge–discharge process. The NSCNTs intensified the flexibility and constructed a conductive framework for rapid ion/electron transfer, whereas the electrocatalysis of MoS 2 managed the sulfur reaction chemistry in two ways: it chemically immobilized LiPSs through Li−S bonds and kinetically sped up the sulfur redox reactions. Owing to these merits, the Li–S cell with a NSCNTs/MoS 2 host and NSCNTs/MoS 2 ‐coated separator (NSCNTs/MoS 2 /S‐NM) exhibited a high reversible capacity of 814 mAh g −1 at 1.0 C and long‐lasting cycling durability with an ultralow capacity decay of 0.02 % per cycle over 1000 cycles. Accordingly, rationally integrating the concepts of physical immobilization, chemical capture, and electrocatalysis to establish a multifaced cell structure for the architecture of high‐performance Li–S batteries is a significant strategy.