Abstract

Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion batteries. However, their development is hampered by the lack of suitable electrode materials. In this work, we demonstrate that MoS₂ with expanded interlayers represents a promising candidate for the electrochemical storage of potassium ions. Hierarchical interlayer-expanded MoS₂ assemblies supported on carbon nanotubes are prepared via a straightforward solution method. The increased interlayer spacing not only enables the better accommodation of foreign ions, but also lowers the diffusion energy barrier and improves diffusion kinetics of ions. When investigated as the anode material of potassium ion batteries, our interlayer-expanded MoS₂ assemblies exhibit an excellent electrochemical performance with large capacity (up to ∼ 520 mAhg⁻¹), good rate capability (∼ 310 mAhg⁻¹ at 1,000 mAg⁻¹) and impressive cycling stability, superior to most competitors.

中文翻译：

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层间扩展的MoS 2组件，用于增强钾离子的电化学存储

抽象的

钾离子电池被认为是锂离子电池的低成本替代品。然而，由于缺乏合适的电极材料而阻碍了它们的发展。在这项工作中，我们证明具有扩展的中间层的MoS ₂代表了钾离子的电化学存储的有希望的候选者。通过简单的溶液法制备了在碳纳米管上支撑的分层的层间扩展MoS ₂组件。增加的层间间距不仅可以更好地容纳外来离子，还可以降低扩散能垒并改善离子的扩散动力学。当作为钾离子电池的负极材料进行研究时，我们的层间膨胀MoS ₂组合件表现出具有大容量（高达〜520 mAhg优异的电化学性能^-1），良好的倍率性能（〜310 mAhg ^-1在1000 MAG ^-1）和令人印象深刻的循环稳定性，优于大多数的竞争对手。