A 3D Porous MgFe2O4 Integrative Electrode as a Binder-Free Anode with High Rate Capability and Long Cycle Lifetime

A superior 3D architecture Ni foam/MgFe2O4 integrative electrode was firstly designed and synthesized via a simple hydrothermal method and subsequent calcination as a binder-free anode for lithium-ion batteries (LIBs). MgFe2O4 nanoparticles with diameter of about 60 nm interconnect with each other to form porous nanosheets and anchor on the Ni foam (N-MFO). The 3D architectural design with superior conductivity and a strong skeleton structure not only provides fast kinetics, reduces the polarization and enhances the rate performance, but also buffers volume expansion and improves the cycle stability during the discharge/charge process. In addition, the interfacial lithium storage of the N-MFO electrode promotes high lithium-storage capacity, superior cycle stability and impressive rate capability. Even cycling at a current density of 5 Ag-1 for 1000 cycles, the capacity remains stable at about 780 mAh g(-1).