Rational Design of Yolk-Shell Fe7S8@C-N for High Rate and Long Cycle Li-Ion Batteries

被引：0

作者：

Chen, Bin ^{[1
]}

Cao, Tingyue ^{[2
]}

Yu, Yan ^{[2
]}

Chen, Meifang ^{[1
]}

Liu, Xuhao ^{[1
]}

Liang, Wei ^{[1
]}

Jin, Huashuo ^{[1
]}

Tian, Xuan ^{[3
]}

Zhang, Panpan ^{[3
,4
]}

Lu, Xing ^{[1
,3
]}

Li, De ^{[1
]}

Chen, Yong ^{[5
]}

Wang, Wenxing ^{[2
]}

Wei, Yaqing ^{[1
,4
]}

机构：

[1] Hainan Univ, Sch Mat Sci & Engn, Hainan Prov Key Lab Res Utilizat Si Zr Ti Resource, State Key Lab Trop Ocean Engn Mat & Mat Evaluat, Haikou 570228, Hainan, Peoples R China

[2] Fudan Univ, Dept Chem, State Key Lab Mol Engn Polymers & iChem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

[4] Nankai Univ, Key Lab Adv Energy Mat Chem, Minist Educ, Tianjin 300071, Peoples R China

[5] Foshan Univ, Guangdong Key Lab Hydrogen Energy Technol, Foshan 528000, Guangdong, Peoples R China

来源：

NANO LETTERS | 2025年 / 25卷 / 26期

基金：

中国国家自然科学基金;

关键词：

Fe7S8; Ferric sulfide; Li-ion batteries; Anode material; Yolk-shellstructure; Volume expansion; REDUCED GRAPHENE OXIDE; LITHIUM-ION; ANODE MATERIAL; CARBON; PERFORMANCE; STORAGE; NANOCOMPOSITE; MECHANISM;

D O I：

10.1021/acs.nanolett.5c00404

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fe7S8 with large capacity shows high potential for Li-ion batteries, while it still suffers large volume expansion, resulting in fast capacity fading. Herein, a novel yolk-shell structural Fe7S8@C-N is rationally designed, in which the N-doped carbon layer with superior mechanical flexibility enables one to accommodate the volume expansion of the Fe7S8 core and promote its electronic transportation. Besides, the surface porous morphology is believed to facilitate electrolyte infiltration and Li-ion diffusion as well. Therefore, this modified Fe7S8@C-N electrode exhibits lower expansivity (similar to 28.0% vs similar to 87.4%), smaller voltage hysteresis, higher conductivity (1.6 x 10(-2) S/m) and better Li-diffusivity (1.09 x 10(-12) cm(2)/s) than its pure Fe7S8 powder; thus better cyclability (458 mAh/g vs 121 mAh/g after 150 cycles) and rate-capability improvement (546 mAh/g vs 125 mAh/g at 2000 mA/g) can be achieved. Such a yolk-shell structural design strategy can be easily extended to other conversion or alloying type materials for advanced energy storage.

引用

页码：10279 / 10286

页数：8

共 57 条

[31] Carbon-coated mixed-metal sulfide hierarchical structure: MOF-derived synthesis and lithium-storage performances [J].