Synthesis of nitrogen and sulfur co-doped graphene supported hollow ZnFe₂O₄nanosphere composites for application in lithium-ion batteries

Nitrogen and sulfur co-doped graphene supported hollow ZnFe₂O₄nanosphere composites have been successfully synthesized via a facile, two-step hydrothermal method. The obtained ZnFe₂O₄/NSG samples show interconnected hollow sphere nanostructure with a size of ∼250 nm. The product demonstrated a high initial discharge capacity of 2478.6 mAhg⁻¹at a rate of 300 mAg⁻¹. After 100 cycles, it delivered a high reversible capacity of 729.06 mAhg⁻¹and coulombic efficiency of 99.36%, while at high rate capability of 1800 mAg⁻¹, the rate capacity stabilize at 650.1 mAhg⁻¹. It is believed that the composite with good rate capability and stability can be a competitive anode for lithium-ion batteries.