School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Adv Mater. 2018 May;30(21):e1706668. doi: 10.1002/adma.201706668. Epub 2018 Apr 6.
Electrode materials based on electrochemical conversion reactions have received considerable interest for high capacity anodes of sodium-ion batteries. However, their practical application is greatly hindered by the poor rate capability and rapid capacity fading. Tuning the structure at nanoscale and increasing the conductivity of these anode materials are two effective strategies to address these issues. Herein, a two-step ion-exchange method is developed to synthesize hierarchical Cu-doped CoSe microboxes assembled by ultrathin nanosheets using Co-Co Prussian blue analogue microcubes as the starting material. Benefitting from the structural and compositional advantages, these Cu-doped CoSe microboxes with improved conductivity exhibit enhanced sodium storage properties in terms of good rate capability and excellent cycling performance.
基于电化学转化反应的电极材料因其作为钠离子电池高容量阳极而受到广泛关注。然而，其实际应用受到较差倍率性能和快速容量衰减的极大阻碍。在纳米尺度上调整结构并提高这些阳极材料的导电性是解决这些问题的两种有效策略。在此，本文开发了一种两步离子交换法，以 Co-Co 普鲁士蓝类似物微立方体为起始材料，合成了由超薄纳米片组装的分级 Cu 掺杂 CoSe 微盒。得益于结构和组成上的优势，这些具有改进导电性的 Cu 掺杂 CoSe 微盒表现出增强的钠离子存储性能，具有良好的倍率性能和优异的循环性能。
