首页|Novel 2D bifunctional layered rare-earth hydroxides@GO catalyst as a functional interlayer for improved liquid-solid conversion of polysulfides in lithium-sulfur batteries

Novel 2D bifunctional layered rare-earth hydroxides@GO catalyst as a functional interlayer for improved liquid-solid conversion of polysulfides in lithium-sulfur batteries

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The detrimental"shuttle effect"of lithium polysulfides(LiPSs)together with sluggish multi-order reac-tion kinetics are the main drawbacks hindering lithium-sulfur(Li-S)batteries from commercial success.Here,we first propose the implementability of layered rare-earth hydroxides(LREHs)in Li-S batteries to optimize electrochemical performance.In this work,a two-dimensional(2D)rare-earth-based composite constructed by the layered gadolinium hydroxy chloride[Gd2(OH)5(H2O)n]Cl nanoplates(LGdH NPs)and graphene oxide(GO)was designed as a sulfur immobilizer for Li-S batteries.Combining the experimental results and density functional theory(DFT)calculations,it is revealed that the LGdH@GO composite not only provides a strong anchoring of the intermediates during cycling,but also acts as an effective catalyst to accelerate the liquid-solid conversion of polysulfides.The Li-S batteries assembled by LGdH@GO mod-ified separators delivered a superior rate performance with a specific capacity of 605.34 mAh/g at 5 C,as well as excellent cycle stability with a decay rate of 0.087％over 500 cycles at 2 C.This study provided a deep understanding of the mechanism to suppress the"shuttle effect"by the LREHs,and a guide to design effective functional interlayers for high-performance Li-S batteries with excellent electrocatalytic activity.

Lithium-sulfur batteriesFunctional separatorLayered rare-earth hydroxidesShuttle effectAdsorptionCatalysis

Haodong Wang、Xiaoxu Lai、Chi Chen、Pei Shi、Houzhao Wan、Hao Wang、Xingguang Chen、Dan Sun

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CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China

College of Chemistry and Materials,Fujian Normal University,Fuzhou 350007,China

Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen 361021,China

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen 361021,China

School of Microelectronics,Hubei University,Wuhan 430062,China

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National Science Foundation for Youths of ChinaNational Science Foundation for Youths of China

2220918422109163

2024

10.1016/j.cclet.2023.108473

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(5)
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