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Sulfhydryl-functionalized cof-based electrolyte strengthens chemical affinity toward polysulfides in quasi-solid-state Li-S batteries

引用

Carbon Energy 2024年第9期6卷 221-234页

作者： Linnan Bi Jie Xiao Yaochen Song Tianrui Sun Mingkai Luo Yi Wang Peng Dong Yingjie Zhang Yao Yao Jiaxuan Liao Sizhe Wang Shulei Chou Yangtze Delta Region Institute(Quzhou) University of Electronic Science and Technology of ChinaQuzhouChina National and Local Joint Engineering Research Center of Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingChina Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengduChina School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi'anChina

For lithium-sulfur batteries(Li-S batteries),a high-content electrolyte typically can exacerbate the shuttle effect,while a lean electrolyte may lead to decreased Li-ion conductivity and reduced catalytic conversion efficiency,so achieving an appropriate electrolyte-to-sulfur ratio(E/S ratio)is essential for improving the battery cycling efficiency.A quasi-solid electrolyte(cof-SH@pvdf-hfp)with strong adsorption and high catalytic conversion was constructed for in situ covalent organic framework(cof)growth on highly polarized polyvinylidene fluoride-hexafluoropropylene(pvdf-hfp)***-SH@pvdf-hfp enables efficient Li-ion conductivity with low-content liquid electrolyte and effectively suppresses the shuttle *** results based on in situ Fourier-transform infrared,in situ Raman,UV–Vis,X-ray photoelectron,and density functional theory calculations confirmed the high catalytic conversion of cof-SH layer containing sulfhydryl and imine groups for the lithium *** plating/stripping tests based on Li/cof-SH@pvdf-hfp/Li show excellent lithium compatibility(5 mAh cm^(-2) for 1400 h).The assembled Li-S battery exhibits excellent rate(2 C 688.7 mAh g^(-1))and cycle performance(at 2 C of 568.8 mAh g^(-1) with a capacity retention of 77.3%after 800 cycles).This is the first report to improve the cycling stability of quasi-solid-state Li-S batteries by reducing both the E/S ratio and the designing strategy of sulfhydryl-functionalized cof for quasi-solid *** process opens up the possibility of the high performance of solid-state Li-S batteries.

关键词： lithium-sulfur batteries low electrolyte-to-sulfur ratio polysulfide shuttle pvdf-hfp/cof

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