Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (3): 710-720.doi: 10.19799/j.cnki.2095-4239.2022.0644

• Energy Storage Materials and Devices • Previous Articles     Next Articles

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

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

CLC Number: