Pie-like free-standing paper of graphene paper@Fe3O4 nanorod array@carbon as integrated anode for robust lithium storage

Abstract

Repressing the hampers of poor electrical conductivity and pulverization is central for the applications of metal oxides anode materials, yet remains big challenge. To meet the target, pie-like graphene paper@Fe3O4 nanorod arrays@carbon film is designed and fabricated as high-performance integrated electrode for lithium ion batteries. Graphene paper is selected as binder-free integrated substrate, which could accelerate electron transfer, buffer volume changes of Fe3O4, contribute to additional capacity, and endow the electrode with flexibility. The carbon film serves as the package to prevent the dissolution of Fe3O4 into the electrolyte, extending the cyclic life of the integrated electrode. The architecture of Fe3O4 nanorod array offers void space for volume buffer and fluid electrolyte infiltration. Based on the combined structural advantages, the present pie-like electrode with interior array architecture therefore exhibits excellent electrochemical lithium storage properties, especially large, stable, and durable cyclic performance at high current density (852mAg−1 after 1000 cycles at 2Ag−1), making it a promising candidate as high-performance flexible electrode.