Zhao Chenyang, Kong Junhua, Yao Xiayin, Tang Xiaosheng, Dong Yuliang, Phua Si Lei, Lu Xuehong
School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.
ACS Appl Mater Interfaces. 2014 May 14;6(9):6392-8. doi: 10.1021/am4058088. Epub 2014 Apr 16.
In this work, highly flexible MoS2-based lithium-ion battery anodes composed of disordered thin MoS2 nanoflakes encapsulated in amorphous carbon nanofibrous mats were fabricated for the first time through hydrothermal synthesis of graphene-like MoS2, followed by electrospinning and carbonization. X-ray diffraction as well as scanning and transmission electron microscopic studies show that the as-synthesized MoS2 nanoflakes have a thickness of about 5 nm with an expanded interlayer spacing, and their structure and morphology are well-retained after the electrospinning and carbonization. At relatively low MoS2 contents, the nanoflakes are dispersed and well-embedded in the carbon nanofibers. Consequently, excellent electrochemical performance, including good cyclability and high rate capacity, was achieved with the hybrid nanofibrous mat at the MoS2 content of 47%, which may be attributed to the fine thickness and multilayered structure of the MoS2 sheets with an expanded interlayer spacing, the good charge conduction provided by the high-aspect-ratio carbon nanofibers, and the robustness of the nanofibrous mat.
在这项工作中，首次通过水热合成类石墨烯的二硫化钼，随后进行静电纺丝和碳化，制备出了由包裹在非晶态碳纳米纤维毡中的无序薄二硫化钼纳米片组成的高柔韧性锂离子电池负极。X射线衍射以及扫描和透射电子显微镜研究表明，合成的二硫化钼纳米片厚度约为5nm，层间距扩大，并且在静电纺丝和碳化后其结构和形态得到了很好的保留。在相对较低的二硫化钼含量下，纳米片分散并很好地嵌入碳纳米纤维中。因此，二硫化钼含量为47%的混合纳米纤维毡实现了优异的电化学性能，包括良好的循环稳定性和高倍率容量，这可能归因于具有扩大层间距的二硫化钼片的精细厚度和多层结构、高纵横比碳纳米纤维提供的良好电荷传导以及纳米纤维毡的坚固性。
