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

• 作者: Chaoying Wang Qianqian Yao Yanmei Gan Qixin Zhang Lunhui Guan Yi Zhao
• 来源期刊: 结构化学
• 年，卷（期）: 2022,（1）
• 页码范围: 40-46
• 页数: 7页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2021-0050

摘要

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 struc-ture 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 5A·g-1 and 408 mA·h·g-1 at 8A·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.