Xu Jianguang, Wang Qiang, Li Boman, Yao Wei, He Meng
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
Nanomaterials (Basel). 2021 Dec 20;11(12):3449. doi: 10.3390/nano11123449.
Herein we report that novel two-dimensional (2D) TiSiAlC (TSAC) nanosheets, obtained by sonically exfoliating their bulk counterpart in alcohol, performs promising electrochemical activities in a reversible lithiation and delithiation procedure. The as-exfoliated 2D TSAC nanosheets show significantly enhanced lithium-ion uptake capability in comparison with their bulk counterpart, with a high capacity of ≈350 mAh g at 200 mA g, high cycling stability and excellent rate performance (150 mAh g after 200 cycles at 8000 mA g). The enhanced electrochemical performance of TSAC nanosheets is mainly a result of their fast Li-ion transport, large surface area and small charge transfer resistance. The discovery in this work highlights the uniqueness of a family of 2D layered MAX materials, such as TiGeC, TiSnC and TiSC, which will likely be the promising choices as anode materials for lithium-ion batteries (LIBs).
在此，我们报告通过在酒精中超声剥离块状的新型二维（2D）TiSiAlC（TSAC）纳米片，在可逆的锂化和脱锂过程中表现出有前景的电化学活性。与块状材料相比，剥落的二维TSAC纳米片显示出显著增强的锂离子吸收能力，在200 mA g下具有约350 mAh g的高容量、高循环稳定性和优异的倍率性能（在8000 mA g下200次循环后为150 mAh g）。TSAC纳米片电化学性能的增强主要是由于其快速的锂离子传输、大表面积和小电荷转移电阻。这项工作中的发现突出了二维层状MAX材料家族（如TiGeC、TiSnC和TiSC）的独特性，它们可能是锂离子电池（LIBs）负极材料的有前景的选择。
