A universal cooperative assembly-oriented strategy for VS4 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 

作者机构：School of Chemistry and Materials Science Nanjing Normal University 

出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))

年 卷 期：2024年第67卷第9期

页      面：3153-3161页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

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

主　　题：transition metal sulfides carbon nanostructure interfacial covalent bond magnesium-ion batteries cathode 

摘      要：VS4has 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 Mg2+diffusivity during cycling limit its practical application in large-scale energy storage. Herein, a cooperative assembly-directed strategy is adopted to synthesize VS4nanorods grown in situ on carbon nanotubes（CNTs/VS4）. VS4nanorods 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 Mg2+and Mg Cl+as carriers reduces the polar barrier for divalent Mg2+ion transport. This rationally designed architecture promotes ion diffusion and electron transfer, thus facilitating reaction kinetics. The cooperative assembly-oriented strategy can endow CNTs/VS4with excellent magnesium storage properties, including a high reversible capacity of 223.2 m Ah g-1at a current density of 50 m A g-1, a remarkable discharge capacity of 91.8 m Ah g-1even 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 VS4with other carbon nanostructures.