The Synergistic Effect of MoS2 and NiS on the Electrical Properties of Iron Anodes for Ni-Fe Batteries

Abstract

In this paper, a series of Fe3O4/MoS2/NiS composite electrodes were synthesized by a simple coprecipitation method. The influence of different ratio additives (MoS2 and NiS) on the performance of iron anodes for Ni-Fe batteries was systematically investigated. In this paper, the mixed alkaline solution of 6 mol/L NaOH and 0.6 mol/L LiOH was used as electrolyte, and sintered Ni(OH)2 was used as counterelectrode. The experimental results show that the MoS2 and NiS additives can effectively eliminate the passivation phenomena in iron electrodes, reduce the electrode polarization, and increase the reversibility capacity. As a result, the Fe3O4/MoS2/NiS composite electrodes exhibit a high specific capacity, good rate performance, and long cycling stability. Especially, the Fe3O4/MoS2 (5%)/NiS (5%) electrode with a suitable ratio of additives can provide excellent electrochemical performance, with high discharge capacities of 657.9 mAh g−1, 639.8 mAh g−1, and 442.1 mAh g−1 at 600 mA g−1, 1200 mA g−1, and 2400 mA g−1, respectively. This electrode also exhibits good cycling stability.

A Tale of Nickel-Iron Batteries: Its Resurgence in the Age of Modern Batteries

“…Apart from the established combination of Bi 2 O 3 and FeS, Tang et al [114] investigated the synergistic effect of combining MoS 2 and NiS as Fe-based electrode additives. Independently, both additives exhibited an enhanced performance.…”

“…Compared with the bare Fe3O4 electrode, the specific capacity increases from 483 to 513 mAh g −1 at a current density of 0.09 A g −1 , and the capacity retention increases from 42.4% to 85.7% after 50 cycles at 0.225 A g −1 . Apart from the established combination of Bi2O3 and FeS, Tang et al [114] investigated the synergistic effect of combining MoS2 and NiS as Fe-based electrode additives. Independently, both additives exhibited an enhanced performance.…”