A universal cooperative assembly-oriented strategy for VS_(4) nanorod decoration on carbon nanostructures with enhanced magnesium storage properties  

作　　者：Yuehua Man An Li Haowei Tang Jianlu Sun Yating Fei Yichen Du Xiaosi Zhou 

机构地区：[1]School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China

出　　处：《Science China Chemistry》2024年第9期3153-3161,共9页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22179063)。

摘　　要：VS_(4) has a unique layered atomic chain structure and has the potential to become a high-performance cathode material of magnesium-ion batteries with a high capacity and long cycle life.However,low conductivity and sluggish Mg^(2+)diffusivity during cycling limit its practical application in large-scale energy storage.Herein,a cooperative assembly-directed strategy is adopted to synthesize VS_(4) nanorods grown in situ on carbon nanotubes(CNTs/VS_(4)).VS_(4) nanorods are tightly anchored to CNTs through V-O-C interface covalent bonds,and CNTs can enhance the electronic conductivity of the nanocomposite.In addition,the ion insertion reaction using Mg^(2+)and Mg Cl^(+)as carriers reduces the polar barrier for divalent Mg^(2+)ion transport.This rationally designed architecture promotes ion diffusion and electron transfer,thus facilitating reaction kinetics.The cooperative assembly-oriented strategy can endow CNTs/VS_(4) with excellent magnesium storage properties,including a high reversible capacity of 223.2 m Ah g^(-1)at a current density of 50 m A g^(-1),a remarkable discharge capacity of 91.8 m Ah g^(-1)even at 2,000 m A g^(-1),and an impressive capacity retention of 85.2% after 1,000 cycles at 500 m A g^(-1).Moreover,this strategy can serve as a general synthetic method for the complexation of VS_(4) with other carbon nanostructures.

关 键 词：transition metal sulfides carbon nanostructure interfacial covalent bond magnesium-ion batteries CATHODE 

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