Accelerating lithium-sulfur battery reaction kinetics and inducing 3D deposition of Li2S using interactions between Fe3Se4 and lithium polysulfides

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外文摘要：Although lithium-sulfur batteries(LSBs)exhibit high theoretical energy density,their practical applica-tion is hindered by poor conductivity of the sulfur cathode,the shuttle effect,and the irreversible depo-sition of Li2S.To address these issues,a novel composite,using electrospinning technology,consisting of Fe3Se4 and porous nitrogen-doped carbon nanofibers was designed for the interlayer of LSBs.The porous carbon nanofiber structure facilitates the transport of ions and electrons,while the Fe3Se4 material adsorbs lithium polysulfides(LiPSs)and accelerates its catalytic conversion process.Furthermore,the Fe3Se4 material interacts with soluble LiPSs to generate a new polysulfide intermediate,LixFeSy complex,which changes the electrochemical reaction pathway and facilitates the three-dimensional deposition of Li2S,enhancing the reversibility of LSBs.The designed LSB demonstrates a high specific capacity of 1529.6 mA h g-1 in the first cycle at 0.2 C.The rate performance is also excellent,maintaining an ultra-high specific capacity of 779.7 mA h g-1 at a high rate of 8 C.This investigation explores the mech-anism of the interaction between the interlayer and LiPSs,and provides a new strategy to regulate the reaction kinetics and Li2S deposition in LSBs.

外文关键词：

Lithium-sulfur batteriesPolysulfide intermediatesLi2S electrodepositionInterlayersElectrostatic spinningAdsorptionCatalysis

作者：

Yihan Lin、Liheng Li、Longjie Tan、Yongliang Li、Xiangzhong Ren、Peixin Zhang、Chuanxin He、Lingna Sun

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作者单位：

College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China

基金：

National Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research Foundation,ChinaGuangdong Basic and Applied Basic Research Foundation,ChinaShenzhen Science and Technology Foundation,China

项目编号：

223721032021A15150102412024A1515010032JCYJ20220531103216037

出版年：

2024

DOI：

10.1016/j.jechem.2024.03.052

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.95(8)