School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials and, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, P. R. China.
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
ChemSusChem. 2018 Jan 10;11(1):202-208. doi: 10.1002/cssc.201701759. Epub 2017 Nov 23.
To tackle the issue of the poor rate capability of graphite anodes for potassium-ion batteries (KIBs), nitrogen-doped carbon nanotubes (NCNTs) with an edge-open layer-alignment structure were synthesized using a simple and scalable approach of pyrolyzing cobalt-containing metal-organic frameworks. The unique structure enables a facile and fast intercalation of K ions. As anodes of KIBs, the NCNTs demonstrated an improved rate capability by a high capacity retention of 102 mA h g at a high current density of 2000 mA g and a good stability without evident capacity loss over 500 cycles at 2000 mA g . Our findings can help to develop highperformance anode materials for potassium-ion batteries as large-scale and low-cost energy-storage systems.
为了解决石墨阳极在钾离子电池（KIBs）中倍率性能差的问题，我们采用一种简单且可扩展的方法，通过热解含钴金属有机框架，合成了具有边缘开放层状排列结构的氮掺杂碳纳米管（NCNTs）。这种独特的结构能够使 K 离子轻松快速地嵌入。作为 KIBs 的阳极，NCNTs 在高电流密度 2000 mA g 下表现出了更高的倍率性能，容量保持率为 102 mA h g ，在 2000 mA g 下经过 500 次循环后仍具有良好的稳定性，没有明显的容量损失。我们的研究结果有助于开发用于大规模、低成本储能系统的高性能钾离子电池用阳极材料。
