flower-like nickel sulfide as an efficient electrocatalyst for nonaqueous lithium-air batteries

In this paper, metal sulide materials have been explored for the irst time as a new choice of bifunctional cathode electrocatalyst materials for non-aqueous lithium-air batteries (LABs). Nickel sulides with two diferent morphologies of lower-like (f-NiS) and rod-like (r-NiS) are successfully synthesized using a hydrothermal method with and without the assistance of cetyltrimethyl ammonium bromide. As LAB cathode catalysts, both f-NiS and r-NiS demonstrate excellent catalytic activities towards the formation and decomposition of Li 2 o 2 , resulting in improved speciic capacity, reduced overpotentials and enhanced cycling performance when compared to those of pure Super P based electrode. Moreover, the morphology of NiS materials can greatly afect LAB performance. Particularly, the f-NiS is more favorable than r-NiS in terms of their application in LABs. When compared to both r-NiS and pure super P materials as LAB cathode materials, this f-NiS catalyst material can give the highest capacity of 6733 mA h g − 1 and the lowest charge voltage of 4.24 V at the current density of 75 mA g − 1 and also exhibit an quite stable cycling performance. With the the urgent the energy and power densities of storage and conversion as batteries, fuel cells, and supercapacirors more and more strong . Lithium-air batteries high practical speciic energy densities from 1000 to 2000 Wh kg − 1 which could even match 1700 Wh kg − 1 gasoline most Compared to the pure Super P carbon based LAB cathode, NiS as a catalyst material shows signiicantly improved