Anchoring Polysulfides and Accelerating Redox Reaction Enabled by Fe-Based Compounds in Lithium-Sulfur Batteries

被引：135

作者：

Qiao, Zhensong ^{[1
]}

Zhang, Yinggan ^{[1
]}

Meng, Zhaohui ^{[2
]}

Xie, Qingshui ^{[1
]}

Lin, Liang ^{[1
]}

Zheng, Hongfei ^{[1
]}

Sa, Baisheng ^{[3
]}

Lin, Jie ^{[1
]}

Wang, Laisen ^{[1
]}

Peng, Dong-Liang ^{[1
]}

机构：

[1] Xiamen Univ, Coll Mat, State Key Lab Phys Chem Solid Surfaces,Fujian Key, Collaborat Innovat Ctr Chem Energy Mat,Dept Mat S, Xiamen 361005, Peoples R China

[2] Xiamen Univ, Coll Mat, Fujian Key Prov Lab Soft Funct Mat Res, Res Inst Biomimet & Soft Matter, Xiamen 361005, Peoples R China

[3] Fuzhou Univ, Coll Mat Sci & Engn, Country Multiscale Computat Mat Facil, Fuzhou 350100, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2021年 / 31卷 / 21期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

catalysis; chemisorption; Fe‐ based compounds; FeS; (x) species; lithium– sulfur batteries; shuttle effect;

D O I：

10.1002/adfm.202100970

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The synergetic mechanism of chemisorption and catalysis play an important role in developing high-performance lithium-sulfur (Li-S) batteries. Herein, a 3D lather-like porous carbon framework containing Fe-based compounds (including Fe3C, Fe3O4, and Fe2O3), named FeCFeOC, is designed as the sulfur host and the interlayer on separator. Due to the strong chemisorption and catalytic ability of FeCFeOC composite, the soluble lithium polysulfides (LiPSs) are first adsorbed and anchored on the surface of the FeCFeOC composite and then are catalyzed to accelerate their conversion reaction. In addition, the FexOy in Fe-based compounds can spontaneously react with LiPSs to form magnetic FeSx species with a larger size, further blocking the penetration of LiPSs cross the separator. As a result, the assembled Li-S cells show excellent long-term stability (748 mAh g(-1) over 500 cycles at 1.0 C, and approximate to 0.036% decay per cycle for 1000 cycles at 3.0 C), a superb rate capability with 659 mAh g(-1) at 5.0 C, and lower electrochemical polarization. This work introduces a feasible strategy to anchor and accelerate the conversion of LiPSs by designing the multifunctional Fe-based compounds with high chemisorption and catalytic activity, which advances the large-scale application of high-performance Li-S batteries.

引用

页数：15

共 89 条

[31] From ultrasoft pseudopotentials to the projector augmented-wave method [J].