材料科学
静电纺丝
阳极
电极
碳纳米纤维
硒化物
碳纤维
化学工程
碳化
纳米技术
复合材料
碳纳米管
复合数
化学
冶金
扫描电子显微镜
硒
工程类
聚合物
物理化学
作者
Kun Guo,Xu Wang,Yulin Min,Qing Xu
标识
DOI:10.1016/j.apsusc.2022.154955
摘要
Transition metal selenides are regarded as the promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacitie. However, they still suffer from some fatal flaws including short lifetime and sluggish cycling kinetics. Herein, a free-standing, binder-free electrode was developed by electrospinning and subsequent thermal treatment process, in which three-dimensional (3D) N-doped carbon nanofibers and tin selenide are cross-linked with each other (SnSe/NCF). The synergistic effect of SnSe microsheets and carbon fibers shortens the ion transport channel and increases more active sites. N-doped carbon network not only improves electrical conductivity but also prevents pulverization of the material. The as-prepared SnSe/NCF electrodes exhibit good electrical conductivity and flexibility owing to the highly carbonized carbon nanofiber network. The SnSe/NCF electrode exhibits superior specific capacity with (576.7 mAh g−1 at 0.2 A g−1), ultra-long lifetime (286.4 mAh g−1 after 2100 cycles at 2.0 A g−1) and excellent rate performance (576.7 mAh g−1 at 5 A g−1) as a stand-alone anode for SIBs. This work provides a promising approach for developing flexible energy storage devices.
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