Yolk-shell porous Fe3O4@C anchored on graphene as anode for Li-ion half/full batteries with high rate capability and long cycle life

被引:16
作者
Gao, Xinjin [1 ]
Xiao, Zhenpeng [1 ]
Jiang, Lili [2 ]
Wang, Chao [1 ]
Lin, Xinru [1 ]
Sheng, Lizhi [1 ,3 ]
机构
[1] Beihua Univ, Jilin Prov Key Lab Wooden Mat Sci & Engn, Jilin 132013, Peoples R China
[2] Jilin Inst Chem Technol, Key Lab Special Funct Mat Jilin Prov Univ, Jilin 132022, Peoples R China
[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore
基金
中国国家自然科学基金;
关键词
Core -shell structure; Yolk -shell structure; Iron oxide; Carbon coating; Lithium -ion battery; NANOPARTICLES; PERFORMANCE; MICROSPHERES; CAPACITY;
D O I
10.1016/j.jcis.2023.03.121
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Iron oxides have been widely studied as anode materials for lithium-ion batteries (LIBs) due to their high conductivity (5 x 104 S m-1) and high capacity (ca. 926 mAh g-1). However, having a large volume change and being highly prone to dissolution/aggregation during charge/discharge cycles hinder their practical application. Herein, we report a design strategy for constructing yolk-shell porous Fe3O4@C anchored on graphene nanosheets (Y-S-P-Fe3O4/GNs@C). This particular structure can not only introduce sufficient internal void space to accommodate the volume change of Fe3O4 but also afford a carbon shell to restrict Fe3O4 overexpansion, thus greatly improving capacity retention. In addition, the pores in Fe3O4 can effectively promote ion transport, and the carbon shell anchored on graphene nanosheets is capable of enhancing overall conductivity. Consequently, Y-S-P-Fe3O4/GNs@C features a high reversible capacity of 1143 mAh g-1, an excellent rate capacity (358 mAh g-1 at 10.0 A g-1), and a prolonged cycle life with robust cycling stability (579 mAh g-1 remaining after 1800 cycles at 2.0 A g-1) when assembled into LIBs. The assembled Y-S-P-Fe3O4/GNs@C//LiFePO4 full-cell delivers a high energy density of 341.0 Wh kg-1 at 37.9 W kg-1. The Y-S-P-Fe3O4/GNs@C is proved to be an efficient Fe3O4-based anode material for LIBs. (c) 2023 Elsevier Inc. All rights reserved.
引用
收藏
页码:820 / 830
页数:11
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