材料科学
阴极
镁
化学工程
阳极
钒
范德瓦尔斯力
扩散
离子
密度泛函理论
纳米技术
电极
冶金
物理化学
化学
分子
有机化学
热力学
工程类
计算化学
物理
作者
Yanrong Wang,Ziteng Liu,Caixing Wang,Yi Xu,Renpeng Chen,Lianbo Ma,Yi Hu,Guoyin Zhu,Tao Chen,Zuoxiu Tie,Jing Ma,Jie Liu,Zhong Jin
标识
DOI:10.1002/adma.201802563
摘要
Abstract Rechargeable magnesium batteries have attracted increasing attention due to the high theoretical volumetric capacities, dendrite formation‐free characteristic and low cost of Mg metal anodes. However, the development of magnesium batteries is seriously hindered by the lack of capable cathode materials with long cycling life and fast solid‐state diffusion kinetics for highly‐polarized divalent Mg 2+ ions. Herein, vanadium tetrasulfide (VS 4 ) with special one‐dimensional atomic‐chain structure is reported to be able to serve as a favorable cathode material for high‐performance magnesium batteries. Through a surfactant‐assisted solution‐phase process, sea‐urchin‐like VS 4 nanodendrites are controllably prepared. Benefiting from the chain‐like crystalline structure of VS 4 , the S 2 2‐ dimers in the VS 4 nanodendrites provide abundant sites for Mg 2+ insertion. Moreover, the VS 4 atomic‐chains bonded by weak van der Waals forces are beneficial to the diffusion kinetics of Mg 2+ ions inside the open channels of VS 4 . Through a series of systematic ex situ characterizations and density functional theory calculations, the magnesiation/demagnesiation mechanism of VS 4 are elucidated. The VS 4 nanodendrites present remarkable performance for Mg 2+ storage among existing cathode materials, exhibiting a remarkable initial discharge capacity of 251 mAh g ‐1 at 100 mA g ‐1 and an impressive long‐term cyclability at large current density of 500 mA g ‐1 (74 mAh g ‐1 after 800 cycles).
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