Fe3+ 交联的预包覆Fe3O4 纳米粒子改性rGO自支撑膜的储锂性能

doi:10.19799/j.cnki.2095-4239.2022.0644

摘要/Abstract

摘要：

本工作采用Fe³⁺对含有氧化石墨烯(graphene oxide， GO)预包覆Fe₃O₄的GO自支撑膜进行改性处理制备Fe³⁺诱导交联的预包覆Fe₃O₄纳米粒子复合热还原型氧化石墨烯自支撑膜(Fe³⁺@Fe₃O₄/rGO)。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)等测试手段表征材料组成、结构与形貌，并研究Fe³⁺@Fe₃O₄/rGO自支撑膜作为锂离子电池负极的储锂性能。结果表明球状Fe₃O₄纳米颗粒被GO片层紧密包裹，且经过Fe³⁺诱导交联的Fe³⁺@Fe₃O₄/rGO自支撑膜稳定性显著提高；电化学结果表明，在电流密度为100 mA/g恒流充放电循环100次后，Fe³⁺@Fe₃O₄/rGO放电比容量为545 mAh/g，相比Fe³⁺交联前的Fe₃O₄/rGO自支撑膜放电比容量452 mAh/g明显提高，证明Fe³⁺交联后的自支撑复合结构显示出优异的电化学循环稳定性。本工作简捷高效的制备阳离子诱导交联GO自支撑膜的方法也可推广到其他比容量较高的活性电极材料，具有广泛的应用前景。

关键词: 石墨烯, Fe₃O₄, 交联, 自支撑, 储锂性能

Abstract:

In this study, Fe³⁺ was used to modify the graphene oxide (GO) free-standing film containing GO pre-encapsulated Fe₃O₄ to prepare Fe³⁺ crosslinked with reduced graphene oxides free-standing film by pre-encapsulated Fe₃O₄ nanospheres (Fe^3+?@Fe₃O₄/rGO). Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and other test techniques were used to characterize the composition, structure, and morphology, and to study Fe^3+?@Fe₃O₄/rGO free-standing film lithium storage performance as the cathode of lithium-ion batteries. The results reveal that spherical Fe₃O₄ nanoparticle are tightly wrapped by GO layers, and the stability of Fe³⁺@Fe₃O₄/rGO free-standing film crosslinked by Fe³⁺ is significantly improved. The electrochemical results demonstrate that after 100 cycles of constant current charge and discharge with a current density of 100 mA/g, the specific discharge capacity of Fe³⁺@Fe₃O₄/rGO is 545 mAh/g, which is considerably higher than that of Fe₃O₄/rGO free-standing film discharge ratio capacity of 452 mAh/g before Fe³⁺ crosslinking, which proves that the free-standing composite structure after Fe³⁺ crosslinking shows outstanding electrochemical cycle stability. Additionally, the quick and easy procedure for creating cation-induced GO free-standing film can be used to additional active electrode materials.

Key words: graphene, Fe₃O₄, cross-linked, free-standing, lithium storage performance

中图分类号:

TB 332

曹潘磊, 隋林秀, 冯靖芸, 张维福, 罗城城, 袁小亚. Fe³⁺ 交联的预包覆Fe₃O₄ 纳米粒子改性rGO自支撑膜的储锂性能[J]. 储能科学与技术, 2023, 12(3): 710-720.

Panlei CAO, Linxiu SUI, Jingyun FENG, Weifu ZHANG, Chengcheng LUO, Xiaoya YUAN. Fe³⁺ crosslinking reduced graphene oxides free-standing film by pre-encapsulated Fe₃O₄ nanospheres for lithium storage[J]. Energy Storage Science and Technology, 2023, 12(3): 710-720.

图/表 9

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Fe³⁺ 交联的预包覆Fe₃O₄ 纳米粒子改性rGO自支撑膜的储锂性能

Fe³⁺ crosslinking reduced graphene oxides free-standing film by pre-encapsulated Fe₃O₄ nanospheres for lithium storage

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