Atomic Tungsten on Graphene with Unique Coordination Enabling Kinetically Boosted Lithium–Sulfur Batteries

Abstract

Use of catalytic materials is regarded as the most desirable strategy to cope with sluggish kinetics of lithium polysulfides (LiPSs) transformation and severe shuttle effect in lithium-sulfur batteries (LSBs). Single-atom catalysts (SACs) with 100 %a tom-utilization are advantagous in serving as anchoring and electrocatalytic centers for LiPSs.H erein, an ovel kind of tungsten (W) SACi mmobilized on nitrogendoped graphene (W/NG) with au nique W-O 2 N 2 -C coordination configuration and ah igh Wl oading of 8.6 wt %i s proposed by as elf-template and self-reduction strategy.T he local coordination environment of Watom endows the W/NG with elevated LiPSs adsorption ability and catalytic activity. LSBs equipped with W/NG modified separator manifest greatly improved electrochemical performances with high cycling stability over 1000 cycles and ultrahigh rate capability. It indicates high areal capacity of 6.24 mAh cm À2 with robust cycling life at ahigh sulfur mass loading of 8.3 mg cm À2 .

P-block tin single atom catalyst for improved electrochemistry in a lithium–sulfur battery: a theoretical and experimental study

“…29–34 Taking advantage of the low metal loading, the highly tunable local electronic structure and atomic structure, the carbon-supported SACs were employed as lightweight functional components for enhancing the Li–S electrochemistry. 29,35 Single metal atoms, such as Fe, 36,37 Co, 38–40 Ni, 41 V, 42 , W, 43 Mo 44 anchoring on various carbon substrates, exhibit excellent activity for catalyzing polysulfide conversion and Li 2 S decomposition in Li–S batteries. In previous reports, the SACs employed in Li–S batteries were all based on d-block transition metals, in which the partially filled d bands are the origin of the electrocatalysis activities.…”

Ionic‐Liquid‐Assisted Synthesis of N, F, and B Co‐Doped CoFe2O4−x on Multiwalled Carbon Nanotubes with Enriched Oxygen Vacancies for Li–S Batteries

“…The enhanced redox kinetics of the polysulfides and superior electrocatalytic ability of NFBCoFe 2 O 4− x @MWCNTs could be confirmed by the Tafel plots (Figure 5d). The Tafel plots were fitted in the overpotential interval from −100 to 100 mV and extrapolated to obtain the I 0 value according to the Bulter–Volmer equation [ 51,52 ] where η is the overpotential, a is a constant, b is the Tafel slope, and I is the response current. NFBCoFe 2 O 4− x @MWCNTs exhibited the highest response current in both the reduction and oxidation processes, lowest Tafel slope, and highest exchange current density compared to CoFe 2 O 4 @MWCNTs and MWCNTs.…”

“…The enhanced redox kinetics of the polysulfides and superior electrocatalytic ability of NFBCoFe 2 O 4−x @MWCNTs could be confirmed by the Tafel plots (Figure 5d). The Tafel plots were fitted in the overpotential interval from −100 to 100 mV and extrapolated to obtain the I 0 value according to the Bulter-Volmer equation [51,52] a blogI…”

A review on theoretical models for lithium–sulfur battery cathodes

“…104 Xiong's group proposed a novel kind of tungsten (W) single atomic catalyst with high LiPSs adsorption ability and catalytic activity (Figure 6). 105 F I G U R E 6 The application of Lithium-ion diffusion and Li…”

“…(C) A novel kind of tungsten (W) single atomic catalyst immobilized on nitrogen‐doped graphene (W/NG) as a highly active multifunctional catalytic site. Reproduced with permission of reference 105. Copyright 2021.…”