Experimental and theoretical investigation of a mesoporous NiCoO/rGO nanosheet network as a high-performance anode for lithium-ion batteries.

The layered structures of graphene and reduced graphene oxide (rGO) can enable synergetic binary systems with transition metal oxides, making them promising candidates for high-rate lithium-ion batteries (LIBs). In this study, an NiCoO/rGO nanosheet network was synthesized using a one-pot hydrothermal method followed by calcination. The results of this study demonstrate that the hybrid structure possessed a higher specific surface area (∼121 m g) than pristine NiCoO (∼77 m g). Density functional theory (DFT) calculations and electrochemical impedance spectroscopy (EIS) confirmed the enhanced kinetics of the NiCoO/rGO nanosheet network, making it highly suitable for lithium storage. The developed electrode delivered an initial discharge capacity of ∼1760 mAh g at 50 mA g and exhibited an excellent reversible capacity of ∼867 mAh g at 300 mA g after 100 cycles, with a coulombic efficiency of 86%. Furthermore, the electrode demonstrated outstanding cyclic stability, retaining ∼97% of its capacity after 800 cycles. This significantly improved performance was attributed to the synergistic effects of NiCoO and rGO, as well as the enhanced charge-transfer kinetics. These findings suggest that NiCoO/rGO hybrid structures can play a vital role in the development of efficient and sustainable energy-storage solutions.