储能科学与技术 ›› 2023, Vol. 12 ›› Issue (3): 710-720.doi: 10.19799/j.cnki.2095-4239.2022.0644

• 储能材料与器件 • 上一篇    下一篇

Fe3+ 交联的预包覆Fe3O4 纳米粒子改性rGO自支撑膜的储锂性能

曹潘磊(), 隋林秀, 冯靖芸, 张维福, 罗城城, 袁小亚()   

  1. 重庆交通大学材料科学与工程学院,重庆 400074
  • 收稿日期:2022-11-02 修回日期:2022-12-26 出版日期:2023-03-05 发布日期:2023-04-14
  • 通讯作者: 袁小亚 E-mail:975943920@qq.com;yuanxy@cqjtu.edu.cn
  • 作者简介:曹潘磊(1998—),男,硕士研究生,研究方向为新能源材料,E-mail:975943920@qq.com
  • 基金资助:
    国家自然科学基金项目(51402030);重庆交通大学研究生科研创新项目(2022S0060);重庆市大学生创新创业训练计划项目(S202210618055)

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

Panlei CAO(), Linxiu SUI, Jingyun FENG, Weifu ZHANG, Chengcheng LUO, Xiaoya YUAN()   

  1. School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • Received:2022-11-02 Revised:2022-12-26 Online:2023-03-05 Published:2023-04-14
  • Contact: Xiaoya YUAN E-mail:975943920@qq.com;yuanxy@cqjtu.edu.cn

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 (Fe3+?@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 Fe3+?@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

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