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

作　　者：Chaoying Wang Qianqian Yao Yanmei Gan Qixin Zhang Lunhui Guan Yi Zhao 

机构地区：[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

出　　处：《Chinese Journal of Structural Chemistry》2022年第1期40-46,共7页结构化学（英文）

基　　金：This work was supported by the Science and Technology Planning Project of Fujian Province(2021J01151);CAS Key Laboratory of Design and Assembly of Functional Nanostructures(2013DP173231);the Award Program for Fujian Minjiang Scholar Professorship(2021);the Start-up Funding from FJNU。

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 structure merits of mesoporous SWNTs layer for fast electron/ion transport and hollow Fe_(3)O_(4) for volume accommodation,as-prepared Fe_(3)O_(4)@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 Fe_(3)O_(4) and other SWNT-Fe_(3)O_(4) architectures.Besides,SWNTs coating is also used to improve the sodium and potassium storage performance of FeSe_(2).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.

关 键 词：single-walled carbon nanotubes GRAPHENE Fe_(3)O_(4) FeSe_(2) alkali-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]