Enhanced lithium storage performance of anodes for lithium-ion batteries with biscuit-shaped LaNiO3-NiO/g-C3N4 composites

Abstract

The significance of lithium-ion batteries in our daily lives cannot be overstated, and the advancement of anode materials is instrumental in achieving battery systems with remarkable energy and power density. Perovskite-type oxides with high theoretical capacity and environmental friendliness have received attention, their poor conductivity and bulk effect urgently need to be improved. With graphene-like layered structure, the rich nitrogen content of g-C3N4 can improve the wettability of the electrode and electrolyte, thus improving the lithium charge transfer process. Therefore, we demonstrated that LaNiO3 is the major phase in the LaNiO3-NiO composites with 80.57% and NiO is the sub-phase with 19.43% using Rietveld XRD refinement treatment. The theoretical capacity of the composites was calculated to be 666.8 mAh g−1 combining the respective theoretical capacities of the two phases. Subsequently, the Biscuit-shaped LaNiO3-NiO/g-C3N4 composite was prepared, which showed excellent electrochemical performance when used as an anode material for lithium-ion batteries. The LaNiO3-NiO/g-C3N4 electrodes exhibit excellent rate performance (with 154.5 mAh g−1 at 10 A g−1) and cycling stability (with 502.5 mAh g−1 for 900 cycles at 1.0 A g−1). This work is believed to provide new ideas for the design and synthesis of perovskite oxide materials in the future.