Fluorine-doped MnO@fluorographene with high conductivity for improved capacity and prolonged cycling stability of lithium-ion anode

The hierarchical composite of fluorine-doped MnO and fluorographene (F-MnO@FG) was successfully synthesized through a hydrothermal process combined with annealing, and it exhibited higher capacity and prolonged cycling stability compared with many reported carbonaceous MnO-based anodes for lithium-ion batteries (LIBs). F-MnO@FG composite showed a high capacity of 1104.8 mAh g-1 after 350 cycles at a current density of 1 A g-1 and stable cycling performance of 382.2 mAh g-1 after 2000 cycles at 5 A g-1. It relates to the structure of F-MnO@FG composite with the advantages of F doping and abundant oxygen vacancies. The prepared FG of F-MnO@FG was measured to have a certain content of semi-ionic C-F bonds, which can provide porous conductive networks facilitating electron/ion transfer. The F doping of MnO nanoparticles and the induced more oxygen vacancies have endowed the composite higher intrinsic con-ductivity and more active sites for Li+ adsorption. This rational preparation method can be utilized to other similar materials with high electrode kinetics for promising anode of LIBs.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

The hierarchical composite of fluorine-doped MnO and fluorographene (F-MnO@FG) was synthesized using a hydrothermal process combined with annealing. It exhibited higher capacity and prolonged cycling stability compared to other carbonaceous MnO-based anodes for lithium-ion batteries (LIBs). The composite's structure, with the advantages of F doping and abundant oxygen vacancies, contributed to its high performance. The rational preparation method can be applied to similar materials for promising LIB anodes.