<br>针对多硫化物穿梭的两步催化增强先进锂硫电池的氧化还原转化,Small

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针对多硫化物穿梭的两步催化增强先进锂硫电池的氧化还原转化
Small ( IF 13.0 ) Pub Date : 2023-11-12 , DOI: 10.1002/smll.202306928
Chengxiang Tian _{1,

2} , Pengcheng Li ₂ , Xin Hu ₂ , Wensheng Yan ₁ , Xia Xiang ₂ , Li Lu ₃

Affiliation

多硫化锂（LiPS）的穿梭效应和硫的低电导率严重阻碍了锂硫电池的发展。为了解决这些问题，可以使用高效的催化剂来提高LiPS的转化率和硫阴极的电导率。这里，采用退火三聚氰胺泡沫负载MoSe ₂ (NCF@MoSe ₂ )作为中间层，并进一步使用磷化MoSe ₂得到的MoSe ₂ /MoP异质结作为与硫元素金属熔合的催化剂材料。中间层不仅可以提高导电率并有效吸附和催化LiPSs，更重要的是，MoSe ₂ /MoP异质结还可以有效吸附和催化LiPSs，从而使电池具有双重抑制穿梭效应策略。此外，利用理论计算和原位拉曼光谱阐明了LiPS的快速锚定扩散转变以及催化剂材料对穿梭效应的抑制。两步催化策略在0.5 C下循环200次后表现出983 mAh g ^-1的高可逆性和在5 C下889 mAh g ^-1的高倍率容量。这项工作为中间层的合理设计提供了可行的解决方案和异质结材料，也有利于开发更先进的锂硫电池。

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Two-Step Catalytic Against Polysulfide Shuttling to Enhance Redox Conversion for Advanced Lithium–Sulfur Batteries

The development of lithium–sulfur batteries is seriously hindered by the shuttle effect of lithium polysulfides (LiPSs) and the low electrical conductivity of sulfur. To solve these problems, efficient catalysts can be used to improve the conversion rate of LiPSs and the conductivity of sulfur cathode. Herein, annealed melamine foam supported MoSe₂ (NCF@MoSe₂) is used as interlayer and the MoSe₂/MoP heterojunction obtained by phosphating MoSe₂ is further used as the catalyst material for metal fusion with a sulfur element. The interlayer can not only improve the electrical conductivity and effectively adsorb and catalyze LiPSs, but more importantly, the MoSe₂/MoP heterojunction can also effectively adsorb and catalyze LiPSs, so that the batteries have a dual inhibition shuttling effect strategy. Furthermore, the rapid anchor-diffusion transition of LiPSs, and the suppression of shuttling effects by catalyst materials are elucidated using theoretical calculations and in situ Raman spectroscopy. The two-step catalytic strategy exhibits a high reversibility of 983 mAh g⁻¹ after 200 cycles at 0.5 C and a high-rate capacity of 889 mAh g⁻¹ at 5 C. This work provides a feasible solution for the rational design of interlayer and heterojunction materials and is also conducive to the development of more advanced Li–S batteries.

更新日期：2023-11-12

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