Single Mo–N_4 Atomic Sites Anchored on N-doped Carbon Nanoflowers as Sulfur Host with Multiple Immobilization and Catalytic Effects for High-Performance Lithium–Sulfur Batteries

Daying Guo; Xu Zhang; Menglan LiuZhisheng YuXi’an ChenBin YangZhen ZhouShun Wang

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Single Mo–N_4 Atomic Sites Anchored on N-doped Carbon Nanoflowers as Sulfur Host with Multiple Immobilization and Catalytic Effects for High-Performance Lithium–Sulfur Batteries

机译：Single Mo–N_4 Atomic Sites Anchored on N-doped Carbon Nanoflowers as Sulfur Host with Multiple Immobilization and Catalytic Effects for High-Performance Lithium–Sulfur Batteries

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Rational design of sulfur hosts for effectively confining lithium polysulfides(LiPS) and optimizing the sluggish sulfur kinetics is still a major challengein lithium–sulfur batteries (LSBs). In this work, a simple strategy ofintroducing single Mo–N_4 atoms into N-doped carbon nano-flower matrix(Mo-N-CNF) as sulfur host cathode materials is developed to realize highperformanceLSBs. These single Mo–N_4 atoms have been demonstratedto regulate the hydrophilic nature, Li-ion diffusion, adsorption capacity,and catalytic conversion of polysulfides via experimental evidences andtheoretical calculations. The resulting Mo-N-CNF with high loading contentof sulfur (>72 wt.%) exhibits a high specific capacity (1248 mAh g~(–1)at 0.2 C) and excellent rate capability (715 mAh g~(–1) at 5 C). More importantly,the outstanding cycling performance with a low attenuation rateof only 0.004% per cycle over 400 cycles at 4.27 mA cm–2 is achieved withthe area sulfur loading of 5.1 mg cm~(–2). This work demonstrates a viablestrategy for using single atoms-based carbon materials with high exposedsites as multiple captors for LiPS and an efficient accelerator for sulfurredox kinetics toward next-generation LSBs with boosted electrochemicalperformance.

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《Advanced functional materials》 |2022年第35期|2204458.1-2204458.10|共10页
作者
Daying Guo; Xu Zhang; Menglan LiuZhisheng YuXi’an ChenBin YangZhen ZhouShun Wang;
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作者单位

Key Laboratory of Carbon Materials of Zhejiang ProvinceCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035, P. R. China;

Engineering Research Center of Advanced Functional MaterialManufacturing of Ministry of EducationSchool of Chemical EngineeringZhengzhou UniversityZhengzhou 450001, P. R. China;

Engineering Research Center of Advanced Functional MaterialManufacturing of Ministry of EducationSchool of Chemical EngineeringZhengzhou UniversityZhengzhou 450001, P. R. China School of Materials Science and EngineeringInstitute of New Energy Material Ch;

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catalytic conversion of polysulfides; Li–S batteries; multiple immobilization of polysulfides; N-doped carbon nanoflowers; single Mo–N_4 atoms;

Single Mo–N_4 Atomic Sites Anchored on N-doped Carbon Nanoflowers as Sulfur Host with Multiple Immobilization and Catalytic Effects for High-Performance Lithium–Sulfur Batteries

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