Journal
APPLIED SURFACE SCIENCE
Volume 606, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154955
Keywords
Free-standing; Binder -free electrode; Carbon nanofibers; Anode; Sodium -ion batteries
Categories
Funding
- National Natural Science Foundation of China (NSFC)
- Technology Commission of Shanghai Municipality
- International Joint Laboratory on Resource Chemistry
- [22075174]
- [18020500800]
- [18JC1412900]
- [19DZ2271100]
- [20520740900]
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In this study, a free-standing, binder-free electrode composed of three-dimensional N-doped carbon nanofibers and tin selenide was developed through electrospinning and thermal treatment. The electrode exhibited good electrical conductivity and flexibility and showed superior specific capacity, ultra-long lifetime, and excellent rate performance as a stand-alone anode for sodium-ion batteries. This work provides a promising approach for developing flexible energy storage devices.
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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