Sulfurization accelerator coupled Fe_(1-x)S electrocatalyst boosting SPAN cathode performance
作者机构：Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第7期
页 面：9231-9239页
核心收录：
学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：This work was supported by the National Key R&D Program of China(No.2018YFB0905600) the Innovation Research Funds of Huazhong University of Science and Technology(HUST,No.2172019kfyRCPY100)。
主 题：Li-S batteries electrocatalyst electrospun sulfurized polyacrylonitrile(SPAN) vulcanization accelerators
摘 要：Sulfurized polyacrylonitrile(SPAN)cathode exhibits improved cycling stability in carbonate electrolytes due to the existent of-S_(x)^(2-)-(2≤n≤4)units.However,it is still challenging for SPAN to achieve higher sulfur content,superior conductivity,and faster polysulfide conversion kinetics in ether electrolytes.Herein,polyacrylonitrile(PAN),2-morpholinothiobenzothiazole(MBS),and FeCl_(3)coated reduced graphene oxide(rGO)were used to fabricate advanced sulfur cathode through electrospinning technology to address these problems.During PAN sulfuration reactions,the MBS with abundant unsaturated bonds served as the vulcanization accelerator to facilitate the formation of longer chain sulfur species(-S_(3)-/-S_(4)-)and increase the sulfur content in the SPAN electrode system.Meanwhile,Fe_(1-x)S is in situ converted from FeCl_(3),which acts as the electrocatalyst to promote Li_(2)S nucleation and decomposition reactions.As a result,the Fe_(1-x)S/SPAN/rGO electrode with high sulfur loading of 2.0 mg·cm^(-2)delivers a reversible capacity of 1122 mAh·g^(-1)at 0.1 A·g^(-1).Notably,at a large current density of 5.0 A·g^(-1),the Fe_(1-x)S/SPAN/rGO electrode still displays a high specific capacity of 924 mAh·g^(-1)with an ultra-stable cycling life over 2000 cycles.The present work provides new insights into designing of high-performance electrode materials for long-lasting Li-S batteries.
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