阳极
材料科学
过电位
锂(药物)
化学工程
碳纳米纤维
聚丙烯腈
纳米颗粒
碳纤维
纳米技术
电化学
电极
复合材料
碳纳米管
化学
聚合物
医学
物理化学
复合数
工程类
内分泌学
作者
Zhongxun Yu,Dingbo Han,Jia Chen,Zhiyang Xu,Xinhua Liu,Shichun Yang,Yong Liu
标识
DOI:10.1016/j.electacta.2022.140552
摘要
Lithium metal anodes have attracted increasing attention in recent years. However, there are still significant challenges in the electrochemical cycle of lithium metals, including the growth of lithium dendrites, the formation of "dead lithium" layers, and unrestricted volume expansion. To solve these problems, using inexpensive acetylacetonate salt, polyacrylonitrile, and polymethyl methacrylate as raw materials, a 3D porous carbon nanofiber scaffold decorated with iron nanoparticles is reasonably designed by novel and unique in-situ growth method, without hazardous atmosphere, expensive catalyst deposition, and additional carbon sources. Notably, the obtained iron-doped 3D porous fibers can be used as lithium metal anode framework with low lithium deposition overpotential and long cycling stability under various current densities. The porous host structure can adapt to the inherent volume expansion and the transmission of lithium ions in the process of lithium plating/stripping, thereby improving the cycling stability. Density functional theory calculations indicate that carbon nanofibers decorated with Fe nanoparticles are more likely to absorb lithium atoms, resulting in more uniform lithium deposition. The present work provides a low-cost and scalable strategy for constructing 3D structural high-efficiency lithium metal anode, and opens new horizons for the research of lithium metal batteries and even other metal batteries.
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