Inhibiting shuttle effect of lithium polysulfides by double metal selenides for high-performance lithium-sulfur batteries
作者机构：Key Laboratory of Automobile MaterialsMinistry of Educationand College of Materials Science and EngineeringJilin University
出 版 物：《Rare Metals》 (稀有金属(英文版))
年 卷 期：2024年第43卷第6期
页 面：2546-2559页
核心收录：
学科分类：0808[工学-电气工程] 08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：financially supported by the National Natural Science Foundation of China (No.52130101) the Project of Science and Technology Development Plan of Jilin Province in China (Nos.20210402058GH and 20220201114GX)
主 题：Lithium–sulfur batteries Shuttling effect Metal selenide Nitrogen-doped carbon Lithium polysulfides
摘 要：Lithium-sulfur batteries（LSBs） have attracted the attention of more and more researchers due to the advantages of high energy density,environmental friendliness,and low production cost.However,the low electronic conductivity of active material and shuttling effect of lithium polysulfides（LiPSs） limit the commercial development of LSBs.To solve these problems,we design a core-shell composite with nitrogen-doped carbon（NC） and two types of selenides（FeSe2-NC@ZnSe-NC）.The FeSe2-NC@ZnSe-NC has a strong adsorption capacity,and can effectively adsorb LiPSs.At the same time,it also effectively alleviates the shuttling effect of LiPSs,and improves the utilization of the active substance during the charge/discharge reaction processes.The mechanism involved in FeSe2-NC@ZnSe-NC is demonstrated by both experiments and density-functional theory（DFT） calculations.The electrochemical test results indicate that LSB with S/FeSe2-NC@ZnSe-NC delivers an initial discharge capacity of 1260 mAh·g-1at 0.2C.And after 500 cycles at 1C,the capacity decay rate per cycle is 0.031%,and the capacity retention rate is 85%.The FeSe2-NC@ZnSe-NC core-shell structure verifies a rational strategy to construct an electrode material for high-performance LSBs.
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