蒲公英状VO₂纳米材料用于水系锌离子电池正极的性能研究

Investigated the Performance of Dandelion-Like VO₂ Nanomaterials as Cathode for Aqueous Zinc Ion Batteries

摘要: 水系锌离子电池由于其安全性高、成本低，是一种极具应用潜力的储能系统，但容量不佳以及正极循环稳定性差阻碍其进一步发展。本文应用水热法合成了一种由纳米线构成的蒲公英状的VO₂正极材料，该独特的形貌不仅改善了VO₂纳米线的自堆积问题，而且赋予VO₂正极丰富的活性位点和优异的结构稳定性，显示出极好的储锌性能。电流密度为0.1 A•g⁻¹时，其容量为307 mAh•g⁻¹；电流密度为0.5 A•g⁻¹时，其容量为261 mAh•g⁻¹，循环200次后容量保持率在64.6%，且在5 A•g⁻¹的高电流密度下循环2300次依然保持优异的稳定性。这项工作为水系锌离子电池先进正极材料的设计及合成提供了新思路。

Abstract: Aqueous zinc ion battery is an energy storage system with great application potential because of its high safety and low cost, but its further development is hindered by low capacity and poor cycle stability of cathode materials. In this paper, dandelion-like VO₂ composed of nanowires was synthesized with hydrothermal method. This unique morphology not only improves the self-stacking problem of VO₂ nanowires, but also endows VO₂ cathode with abundant active sites and excellent structural stability. Thus, it exhibits excellent znic ions storage performance of 307 mAh•g⁻¹ at 0.1 A•g⁻¹, 261.5 mAh•g⁻¹ at 0.5 A•g⁻¹, and the capacity retention rate is 64% after 200 cycles. It keeps capable cycling stability even after 2300 cycles. This work provides a new idea for the design and synthesis of advanced cathode materials for aqueous zinc ion battery.