Sun Qiong, Geng Lin, Wang Lin, Che Tian, Tian Dan, Xu Li-Chun, Zhao Jianwen, Zhong Yunlei, Wang Yatong, Yang Yong, Kang Lixing
National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215000, P. R. China.
Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Division of Advanced Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
Nano Lett. 2024 Jun 26;24(25):7732-7740. doi: 10.1021/acs.nanolett.4c01641. Epub 2024 Jun 13.
Rechargeable lithium-ion batteries are integral to contemporary energy storage, yet current anode material systems struggle to meet the increasing demand for extended range capabilities. This work introduces a novel composite anode material composed of one-dimensional 2H-phase tin disulfide (SnS) nanoribbons enclosed within cavities of single-walled carbon nanotubes (SnS@SWCNTs), achieved through precise atomic engineering. Employing aberration-corrected transmission electron microscopy, we precisely elucidated the crystal structure of SnS within the confines of the SWCNTs. This deliberate design effectively addresses the inherent limitations of SnS as a lithium-ion anode material, including its low electrical conductivity, considerable volume expansion effects, and unstable solid electrolyte interface membrane. Testing confirmed that SnS transforms into the LiSn alloy phase after full lithiation and back to SnS after delithiation, showing excellent reversibility. The composite also benefits from edge effects, improving lithium storage through stronger binding and lower migration barriers, which were supported by calculations. This pioneering work advances high-performance anode materials for applications.
可充电锂离子电池是当代能量存储不可或缺的一部分，但目前的负极材料体系难以满足对更长续航能力日益增长的需求。这项工作介绍了一种新型复合负极材料，它由包裹在单壁碳纳米管（SnS@SWCNTs）腔内的一维2H相二硫化锡（SnS）纳米带组成，这是通过精确的原子工程实现的。利用像差校正透射电子显微镜，我们精确地阐明了单壁碳纳米管内SnS的晶体结构。这种精心设计有效地解决了SnS作为锂离子负极材料的固有局限性，包括其低电导率、相当大的体积膨胀效应以及不稳定的固体电解质界面膜。测试证实，SnS在完全锂化后转变为LiSn合金相，脱锂后又变回SnS，显示出优异的可逆性。该复合材料还受益于边缘效应，通过更强的结合和更低的迁移势垒改善了锂存储，计算结果支持了这一点。这项开创性的工作推动了高性能负极材料的应用。
