Uniform FexNiy Nanospheres: Cost-Effective Electrocatalysts for Nonaqueous Rechargeable Li–O2 Batteries

Uniform Fe _x Ni _y nanospheres were synthesized via a simple solvothermal method and used as electrocatalysts for Li-O₂ batteries. Fe₇Ni₃ nanospheres exhibited relatively high catalytic activities in the electrochemical tests. They delivered a reversible capacity of more than 7000 mAh/g_KB and gave a discharge-charge voltage gap reduction of 250 mV compared with Ketjen Black.