首页|VSe2/V2C heterocatalyst with built-in electric field for efficient lithium-sulfur batteries:Remedies polysulfide shuttle and conversion kinetics

VSe2/V2C heterocatalyst with built-in electric field for efficient lithium-sulfur batteries:Remedies polysulfide shuttle and conversion kinetics

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Lithium sulfur(Li-S)battery is a kind of burgeoning energy storage system with high energy density.However,the electrolyte-soluble intermediate lithium polysulfides(LiPSs)undergo notorious shuttle effect,which seriously hinders the commercialization of Li-S batteries.Herein,a unique VSe2/V2C heterostructure with local built-in electric field was rationally engineered from V2C parent via a facile thermal selenization process.It exquisitely synergizes the strong affinity of V2C with the effective elec-trocatalytic activity of VSe2.More importantly,the local built-in electric field at the heterointerface can sufficiently promote the electron/ion transport ability and eventually boost the conversion kinetics of sulfur species.The Li-S battery equipped with VSe2/V2C-CNTs-PP separator achieved an outstanding initial specific capacity of 1439.1 mA h g-1 with a high capacity retention of 73％after 100 cycles at 0.1 C.More impressively,a wonderful capacity of 571.6 mA h g-1 was effectively maintained after 600 cycles at 2 C with a capacity decay rate of 0.07％.Even under a sulfur loading of 4.8 mg cm-2,areal capac-ity still can be up to 5.6 mA h cm-2.In-situ Raman tests explicitly illustrate the effectiveness of VSe2/V2C-CNTs modifier in restricting LiPSs shuttle.Combined with density functional theory calculations,the underlying mechanism of VSe2/V2C heterostructure for remedying LiPSs shuttling and conversion kinet-ics was deciphered.The strategy of constructing VSe2/V2C heterocatalyst in this work proposes a univer-sal protocol to design metal selenide-based separator modifier for Li-S battery.Besides,it opens an efficient avenue for the separator engineering of Li-S batteries.

Li-S batteryShuttle effectSeparator modifierVSe2/V2C heterostructureBuilt-in electric field

Yanwei Lv、Lina Bai、Qi Jin、Siyu Deng、Xinzhi Ma、Fengfeng Han、Juan Wang、Lirong Zhang、Lili Wu、Xitian Zhang

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Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,Heilongjiang,China

National Natural Science Foundation of ChinaJoint Guidance Project of the Natural Science Foundation of Heilongjiang Province,ChinaTeam Program of the Natural Science Foundation of Heilongjiang Province,ChinaModern Educational Technology and Experiment Center,Harbin Normal University,PR China

52072099LH2022E093TD2021E005

2024

10.1016/j.jechem.2023.10.003

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)：2024.89(2)
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