Electrochemical Innovation Lab, Department of Chemical Engineering, UCL, London WC1E 7JE, U.K.
ACS Appl Mater Interfaces. 2023 Apr 5;15(13):16664-16672. doi: 10.1021/acsami.2c21490. Epub 2023 Mar 21.
High-rate batteries will play a vital role in future energy storage systems, yet while good progress is being made in the development of high-rate lithium-ion batteries, there is less progress with post-lithium-ion chemistry. In this study, we demonstrate that pseudohexagonal NbO(TT-NbO) can offer a high specific capacity (179 mAh g ∼ 0.3C), good lifetime, and an excellent rate performance (72 mAh g at ∼15C) in potassium-ion batteries (KIBs), when it is composited with a highly conductive carbon framework; this is the first reported investigation of TT-NbO for KIBs. Specifically, multiwalled carbon nanotubes are strongly tethered to NbO via glucose-derived carbon (NbO@CNT) by a one-step hydrothermal method, which results in highly conductive and porous needle-like structures. This work therefore offers a route for the scalable production of a viable KIB anode material and hence improves the feasibility of fast-charging KIBs for future applications.
高倍率电池将在未来的能源存储系统中发挥至关重要的作用，尽管在高倍率锂离子电池的开发方面已经取得了良好的进展，但在后锂离子化学方面的进展却较少。在这项研究中，我们证明了伪六方氧化铌（TT-NbO）在与高导电性碳骨架复合时，可在钾离子电池（KIBs）中提供高比容量（在 0.3C 时为 179 mAh g -1 ）、良好的循环寿命和优异的倍率性能（在 15C 时为 72 mAh g -1 ）；这是 TT-NbO 首次被报道用于 KIBs。具体来说，多壁碳纳米管通过一步水热法通过葡萄糖衍生的碳（NbO@CNT）与 NbO 强连接，从而形成高导电性和多孔针状结构。因此，这项工作为可扩展生产可行的 KIB 阳极材料提供了一条途径，从而提高了用于未来应用的快速充电 KIB 的可行性。
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