Prussian Blue Analogues “Dressed” in MXene Nanosheets Tightly for High Performance Lithium-Ion Batteries

IF 27.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yuxin Shi, Gongjing Song, Biao Yang, Yijian Tang, Zheng Liu, Zhan Zhang, Mohsen Shakouri, Jinbing Cheng, Huan Pang
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Abstract

MXenes, have been considered as a new generation anode material in lithium-ion batteries for lower lithium-ion diffusion barriers and superior conductivity. Unfortunately, their structures are prone to aggregation and stacking, hindering further shuttle of lithium ions and electrons, resulting in lower discharge capacity. Therefore, the introduction of interlayer spacers for the preparation of MXene-based hybrids has attracted much attention. Introducing Prubssian blue analogues (PBAs) as a new interlayer spacer to combine with MXene nanosheets can not only preserve the high conductivity of MXene and inhibit the volume expansion and structural degradation of the PBA component, but also inherit the characteristics of large specific surface area and high porosity of PBAs. By intelligent regulating the size of MXene sheets, Co-PBA@MXene hybrids with common sandwich-like structures and superior core-shell-like structures have been successfully obtained. Furthermore, Co@M(x:y) hybrids are prepared by intelligently adjusting the shell thickness of MXene through intelligently controlling of the mass ratio between Co-PBA and MXene. Among them, the Co@M(5:2) anode exhibits an excellent capacity (603 mA h g−1 at 0.2 A g−1 after 100 cycles) and superior long-term cycling stability due to the protective and conductive properties provided by the MXene shell and multi-redox pairs and rich porosity from Co-PBA core.

Abstract Image

Abstract Image

普鲁士蓝类似物“包裹”在MXene纳米片中,用于高性能锂离子电池
MXenes具有较低的锂离子扩散障碍和优异的导电性,被认为是锂离子电池的新一代负极材料。不幸的是,它们的结构容易聚集和堆积,阻碍了锂离子和电子的进一步穿梭,导致放电容量较低。因此,引入层间间隔剂制备mxeni基杂化材料受到了广泛关注。将普鲁士蓝类似物(PBAs)作为新型层间间隔物与MXene纳米片结合,既能保持MXene的高导电性,抑制PBA组分的体积膨胀和结构降解,又能继承PBAs大比表面积和高孔隙率的特点。通过智能调节MXene薄片的尺寸,成功地获得了具有普通三明治结构和优良核壳结构的Co-PBA@MXene杂化材料。通过智能控制Co-PBA与MXene的质量比,智能调节MXene的壳层厚度,制备了Co@M(x:y)杂化体。其中,Co@M(5:2)阳极由于MXene外壳和多氧化还原对提供的保护和导电性能以及Co-PBA芯的丰富孔隙率,具有优异的长期循环稳定性(在0.2 A g- 1循环100次后,容量为603 mA h g- 1)。
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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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