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

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

Abstract

Abstract:

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.

Key words: Composites, Electrostatic spinning, Cobalt sulfide, Co-ZIFs, Lithium-ion batteries

摘要：

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。

关键词: 复合材料, 静电纺丝, 硫化钴, Co-ZIFs, 锂离子电池

CLC Number:

TQ15

Huichuan TANG, Minghong LIU, Aojie LI, Qianqi WU, Qiao JIANG, Haitao WANG, Wei WANG. Preparation of Cobalt Sulfide/Carbon Fiber Composites and Research on Lithium Storage Properties[J]. Journal of Petrochemical Universities, 2024, 37(6): 74-82.

汤汇川, 刘明泓, 李奥杰, 伍仟琦, 姜乔, 王海涛, 王溦. 硫化钴/碳纤维复合材料的制备及储锂性能研究[J]. 石油化工高等学校学报, 2024, 37(6): 74-82.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2024.06.008

https://journal.lnpu.edu.cn/syhg/EN/Y2024/V37/I6/74

Figures/Tables 8

Fig.1 Representation of the synthesis of CoS/CFs-x

Fig.2 XRD patterns, Raman spectra of CoS/CFs-x

Fig.3 N2 adsorption-desorption and pore size distribution curves of CoS/CFs-1.5

Fig.4 TG curve of CoS/CFs-x

Fig.5 XPS spectra of CoS/CFs-1.5

Fig.6 SEM of CoS/CFs-x andTEM,HRTEM and corresponding SAED pattern and TEM-EDS Mapping of CoS/CFs-1.5

Fig.7 Electrochemical performance analysis results of CoS/CFs-x

Fig. 8 Kinetic performance diagram of lithium storage of CoS/CFs-1.5

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