Electrochemical study of reduced graphene oxide@Zn2Ti3O8 nanocomposites as a superior anode for Li-ion battery

Abstract

In this paper, a high-performance Li-ion battery anode, 2D reduced graphene oxide@Zn2Ti3O8 nanocomposite was successfully synthesized. In the mixing process, the porous Zn2Ti3O8 nanoplate and the reduced graphene oxide flakes were closely bonded by the electrostatic force, and then the heterojunction formed between them after 600 °C heat treatment in the N2 atmosphere. Due to the introduction of graphene, the electrochemical impedance of the composite is much reduced, and this two-dimensional heterostructure induced a large number of pseudocapacitance behaviors, which greatly increased the rate performance, cycling stability, and reversible capacity. In the long cycle performance tests at high current densities, the reduced graphene oxide@Zn2Ti3O8 composite can maintain stable capacities of 600 mAh g−1 at 1000 mA g-1and 265 mAh g−1 at 5000 mA g−1, exceeding all previous reports of Zn2Ti3O8 electrode. The excellent performance of the nanocomposite under high current density makes it a potential anode material for lithium-ion batteries.