High-Entropy Catalysis Accelerating Stepwise Sulfur Redox Reactions for Lithium-Sulfur Batteries

被引:27
作者
Xu, Yunhan [1 ]
Yuan, Wenchuang [2 ]
Geng, Chuannan [1 ]
Hu, Zhonghao [1 ]
Li, Qiang [1 ]
Zhao, Yufei [1 ]
Zhang, Xu [2 ]
Zhou, Zhen [2 ]
Yang, Chunpeng [1 ]
Yang, Quan-Hong [1 ]
机构
[1] Tianjin Univ, Nanoyang Grp, Tianjin Key Lab Adv Carbon & Electrochem Energy St, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Zhengzhou Univ, Interdisciplinary Res Ctr Sustainable Energy Sci &, Sch Chem Engn, Zhengzhou 450001, Peoples R China
基金
中国国家自然科学基金;
关键词
electrocatalysis; high-entropy alloys; lithium-sulfur batteries; shuttle effect; ALLOY; METAL;
D O I
10.1002/advs.202402497
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Catalysis is crucial to improve redox kinetics in lithium-sulfur (Li-S) batteries. However, conventional catalysts that consist of a single metal element are incapable of accelerating stepwise sulfur redox reactions which involve 16-electron transfer and multiple Li2Sn (n = 2-8) intermediate species. To enable fast kinetics of Li-S batteries, it is proposed to use high-entropy alloy (HEA) nanocatalysts, which are demonstrated effective to adsorb lithium polysulfides and accelerate their redox kinetics. The incorporation of multiple elements (Co, Ni, Fe, Pd, and V) within HEAs greatly enhances the catalytically active sites, which not only improves the rate capability, but also elevates the cycling stability of the assembled batteries. Consequently, HEA-catalyzed Li-S batteries achieve a high capacity up to 1364 mAh g-1 at 0.1 C and experience only a slight capacity fading rate of 0.054% per cycle over 1000 cycles at 2 C, while the assembled pouch cell achieves a high specific capacity of 1192 mAh g-1. The superior performance of Li-S batteries demonstrates the effectiveness of the HEA catalysts with maximized synergistic effect for accelerating S conversion reactions, which opens a way to catalytically improving stepwise electrochemical conversion reactions. High-entropy alloy (HEA) nanocatalysts with multi-metallic configurations are introduced to boost the multi-step, multi-intermediate S redox reactions in Li-S batteries. The HEAs greatly enhance the catalytic active sites, not only improving the adsorption capability for intermediate polysulfides but also accelerating the redox kinetics of sulfur species, thus enabling practical Li-S batteries with high capacity and low decay rate of 0.054% per cycle over 1000 cycles. image
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页数:9
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