硫化钴/碳纤维复合材料的制备及储锂性能研究

Preparation of Cobalt Sulfide/Carbon Fiber Composites and Research on Lithium Storage Properties

汤汇川 刘明泓 李奥杰 伍仟琦 姜乔 王海涛 王溦

Huichuan TANG Minghong LIU Aojie LI Qianqi WU Qiao JIANG Haitao WANG Wei WANG

湖南理工学院 先进碳基功能材料湖南省重点实验室, 湖南 岳阳 414006 湖南理工学院 化学化工学院, 湖南 岳阳 414006 武汉工程大学 化学与环境工程学院, 湖北 武汉 430205

Key Laboratory of Hunan Province for Advanced Carbon-Based Functional Materials，Hunan Institute of Science and Technology，Yueyang Hunan 414006，China School of Chemistry and Chemical Engineering，Hunan Institute of Science and Technology，Yueyang Hunan 414006，China College of Chemical and Environmental Engineering，Wuhan University of Engineering，Wuhan Hubei 430205，China

在相转变储锂材料中，过渡金属硫化物导电性优于氧化物，且具有较高的理论储锂容量，但其循环稳定性仍需改善。采用一种简单的静电纺丝法制备了在静电纺丝纤维上原位生长钴基沸石咪唑酯骨架（Co-ZIFs）的复合材料，并利用微区ZIFs的稳定结构，在N2热处理中实现了金属颗粒的空间限域；通过硫化反应制备了硫化钴/碳纤维复合材料（CoS/CFs），并采用X射线衍射（XRD）和拉曼光谱等技术对材料的结构和成分进行了表征。结果表明，CoS颗粒均匀分布在碳纳米纤维上；优化后的复合材料具有优异的储锂性能，在电流密度为1 A/g时循环250圈，仍能保持584.5 mA·h/g的比容量，表明其在储锂应用中具有优异的循环稳定性和广阔的应用前景。

Transition metal sulfides are known for their high conductivity and theoretical lithium storage capacity,making them promising materials for phase change lithium storage.However,their cycling stability needs improvement.A simple electrostatic spinning method was used to prepare composites with in situ growth of cobalt-based zeolite imidazolite backbones(Co-ZIFs) on electrostatically spun fibers,and the stabilized structure of microzonated ZIFs was exploited to achieve spatially confined domains of metal particles in an N? heat treatment. Cobalt sulfide/carbon fiber composites (CoS/CFs) were then synthesized through a sulfidation reaction.X-ray diffraction (XRD) and Raman spectroscopy confirmed the uniform distribution of CoS particles on the carbon nanofibers.The optimized composite showed excellent lithium storage performance,maintaining a specific capacity of 584.5 mA·h/g after 250 cycles at a current density of 1 A/g.This demonstrates outstanding cycling stability and suggests promising applications in lithium storage.

湖南省自然科学基金面上项目(2023JJ30280)

10.12422/j.issn.1006-396X.2024.06.008