Abstract

In this study, fine cathode materials Ni_3S_2 and NiS_2 were synthesized using the simple, convenient process of mechanical alloying (MA). In order to improve the cell properties, wet milling processes were conducted using low-energy ball milling to decrease the mean particle size of both materials. The cells of Na/Ni_3S_2 and Na/NiS_2 show a high initial discharge capacity of 425 mAh/g and 577 mAh/g respectively using wet milled powder particles, which is much larger than commercial ones, providing some potential as new cathode materials for rechargeable sodium-ion batteries.

• Keywords: Ni_3S_2;NiS_2;MA;Wet milling;Charge/discharge capacity;