Citation: Chaoying Wang, Qianqian Yao, Yanmei Gan, Qixin Zhang, Lunhui Guan, Yi Zhao. Monodispersed SWNTs Assembled Coating Layer as an Alternative to Graphene with Enhanced Alkali-ion Storage Performance[J]. Chinese Journal of Structural Chemistry, ;2022, 41(1): 220104. doi: 10.14102/j.cnki.0254-5861.2021-0050 shu

Monodispersed SWNTs Assembled Coating Layer as an Alternative to Graphene with Enhanced Alkali-ion Storage Performance

Chaoying Wang ^{1, 3} ,
Qianqian Yao ² ,
Yanmei Gan ² ,
Qixin Zhang ¹ ,
Lunhui Guan ³ ,
Yi Zhao ^{1, 2,,}

1.
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China
2.
Straits Institute of Flexible Electronics (SIFE, Future Technologies), Fujian Normal University, Fuzhou 350117, China
3.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350108, China

Corresponding author: Yi Zhao, ifeyzhao@fjnu.edu.cn
Received Date: 6 December 2021
Accepted Date: 22 December 2021

Figures(6)

Graphene coating is commonly used to improve the performance of electrode materials, while its steric hindrance effect hampers fast ion transport with compromised rate capability. Herein, a unique single-walled carbon nanotubes (SWNTs) coating layer, as an alternative to graphene, has been developed to improve the battery behavior of iron-based anodes. Benefiting from the structure merits of mesoporous SWNTs layer for fast electron/ion transport and hollow Fe₃O₄ for volume accommodation, as-prepared Fe₃O₄@SWNTs exhibited excellent lithium storage performance. It delivers a high capacity, excellent rate capability, and long lifespan with capacities of 582 mA·h·g^-1 at 5 A·g^-1 and 408 mA·h·g^-1 at 8 A·g^-1 remained after 1000 cycles. Such performance is better than graphene-coated Fe₃O₄ and other SWNT-Fe₃O₄ architectures. Besides, SWNTs coating is also used to improve the sodium and potassium storage performance of FeSe₂. The kinetics analysis and ex-situ experiment further reveal the effect of SWNTs coating for fast electron/ion transfer kinetics and good structure stability, thus leading to the superior performance of SWNTs-coated composites.
- single-walled carbon nanotubes,
- graphene,
- Fe₃O₄,
- FeSe₂,
- alkali-ion batteries
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