| Autor: |
Man, Yuehua, Li, An, Tang, Haowei, Sun, Jianlu, Fei, Yating, Du, Yichen, Zhou, Xiaosi |
| Zdroj: |
SCIENCE CHINA Chemistry; Sep2024, Vol. 67 Issue 9, p3153-3161, 9p |
| Abstrakt: |
VS4 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 Mg2+ diffusivity during cycling limit its practical application in large-scale energy storage. Herein, a cooperative assembly-directed strategy is adopted to synthesize VS4 nanorods grown in situ on carbon nanotubes (CNTs/VS4). VS4 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 Mg2+ and MgCl+ 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/VS4 with excellent magnesium storage properties, including a high reversible capacity of 223.2 mAh g−1 at a current density of 50 mA g−1, a remarkable discharge capacity of 91.8 mAh g−1 even at 2,000 mA g−1, and an impressive capacity retention of 85.2% after 1,000 cycles at 500 mA g−1. Moreover, this strategy can serve as a general synthetic method for the complexation of VS4 with other carbon nanostructures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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