When used as lithium-ion batteries (LIBs) anode, ZFO-Fe2O3/g-C3N4 offers discharge specific capacity of 1518.5 mAh g−1 after 300 cycles at the current density of 500 mA g−1 and can still reach 639.2 mAh g−1 at high current density of 10 A g−1.
For lithium-ion batteries, iron-based oxides are expected to be the next generation of anode materials because of their high theoretical capacity, environmental friendliness, and affordability. Although, like most transition metal oxides, iron-based oxides suffer from poor electrical conductivity and cycling performance, volume expansion during charging and discharging, and easily agglomerated. g-C3N4 has a graphene-like layered structure consisting of nitrogen-linked C6N7 repeating units. The abundant nitrogen content can improve the wettability of the electrode and electrolyte, thus improving the lithium charge transfer process, and secondly g-C3N4 is less expensive and easier to prepare than graphene. Here, we report composites with metal oxide nanosheets (ZnFe2O4−Fe2O3) attached to softly curved g-C3N4 nanosheets. When used as an anode material for lithium-ion batteries, after 300 cycles at the current density of 500 mA g−1, ZFO-Fe2O3/g-C3N4 offers the discharge specific capacity (1518.5 mAh g−1) and can still deliver 639.2 mAh g−1 at the high current density (10 A g−1). Due to the introduction of g-C3N4 alleviated the volume change of the electrode, shortened the diffusion distance of Li+ and provided more reactive sites, resulting in excellent electrochemical performance of ZFO-Fe2O3/g-C3N4.Zum Volltext