锂硫电池中能同时实现多硫化锂的物理阻挡与化学电催化作用的隔膜修饰层
Achieving physical blocking and chemical electrocatalysis of polysulfides by using a separator coating layer in lithium-sulfur batteries
吴庆柱 1李莉媛 1郑雨爽 1彭波 1徐杰 1吴孔林 2夏爱林 1马连波3
作者信息
- 1. School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China
- 2. Carbon Cycle and Emission Control Research Center of Low-Carbon Research Institute,Institute of Clean Energy and Advanced Nanocatalysis,School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 243002,China
- 3. School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China;Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong 999077,China
- 折叠
摘要
锂硫电池的实际应用仍受制于一些挑战,包括氧化还原动力学缓慢和由此引发的穿梭效应等.为解决这些问题,我们巧妙合成了一种由FeS2和分等级多孔碳结构(PCF)组成的隔膜修饰层.这种新颖的结构能同时实现对多硫化锂的物理阻挡与化学电催化效应.多硫化锂扩散实验证实PCF修饰的隔膜能够阻挡多硫化锂的渗透,而飞行时间二次离子质谱表明FeS2能催化多硫化锂快速转化.因此,修饰后的锂硫电池表现出优异的倍率性能(5 C时比容量达764 mA h g-1)及显著的长循环稳定性(1 C时循环500次后比容量为698 mA h g-1).值得注意的是,修饰后的锂硫电池最高面积容量为7.52 mA h cm-2,并且能够在较宽温域(-20至60℃)保持高循环稳定性.本研究为隔膜修饰层的高效应用提供了有价值的见解.
Abstract
The persistent challenges in slow redox reaction kinetics and the consequential issue of polysulfide shuttling still restrict the practical utilization of lithium-sulfur(Li-S)batteries.To address these problems,we present a meticu-lously designed separator coating layer composed of a hier-archical porous carbon framework decorated with FeS2(FeS2/PCF).This innovative architecture enables simultaneous physical blockade of polysulfide diffusion and chemical elec-trocatalysis of polysulfide conversions.Polysulfide diffusion tests were conducted and the results demonstrate that PCF effectively hinders the polysulfide penetration and shuttling.Additionally,FeS2 with excellent electrocatalytic activity ex-pedites the polysulfide transformation,as evidenced by sec-ondary ion mass spectroscopy.Consequently,the modified Li-S batteries exhibit exceptional rate capability of 764 mA h g-1 at 5.0 C,and outstanding long-term cyclic stability with sus-taining 698 mA h g-1 after 500 cycles at 1.0 C.Notably,the Li-S batteries achieve an impressive areal capacity of 7.52 mA h cm-2,while maintaining stable cyclic performances across a wide temperature range.This investigation offers valuable insights into the effective utilization of separator coating layers by employing both physical and chemical stra-tegies.
关键词
sluggish reaction kinetics/FeS2/polysulfide penetra-tion/shuttling/separator coating layer/physical and chemical strategiesKey words
sluggish reaction kinetics/FeS2/polysulfide penetra-tion/shuttling/separator coating layer/physical and chemical strategies引用本文复制引用
基金项目
National Natural Science Foundation of China(22005003)
Natural Science Research Project of Anhui Province Education Department(2022AH030046)
Natural Science Research Project of Anhui Province Education Department(2022AH050323)
Young Scholars of the Introduction and Education of Talents in Anhui Province()
Top Young Talents of Anhui University of Technology()
Scientific Research Foundation of Anhui University of Technology for Talent Introduction()
出版年
2024
NETL
NSTL
万方数据