首页|Inhibiting shuttle effect of lithium polysulfides by double metal selenides for high-performance lithium-sulfur batteries

Inhibiting shuttle effect of lithium polysulfides by double metal selenides for high-performance lithium-sulfur batteries

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Lithium-sulfur batteries(LSBs)have attracted the attention of more and more researchers due to the advantages of high energy density,environmental friend-liness,and low production cost.However,the low elec-tronic conductivity of active material and shuttling effect of lithium polysulfides(LiPSs)limit the commercial devel-opment 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 effec-tively 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-1 at 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.

Lithium-sulfur batteriesShuttling effectMetal selenideNitrogen-doped carbonLithium polysulfides

Lei Li、Xue-Jing Yang、Yi-Yang Li、Bo Jin、Hui Liu、Meng-Yang Cui、Dong-Bo Guan、Xing-You Lang、Qing Jiang

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Key Laboratory of Automobile Materials,Ministry of Education,and College of Materials Science and Engineering,Jilin University,Changchun 130022,China

国家自然科学基金Project of Science and Technology Development Plan of Jilin Province in ChinaProject of Science and Technology Development Plan of Jilin Province in China

5213010120210402058GH20220201114GX

2024

10.1007/s12598-024-02616-w

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(6)
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