Ni2P Nanosheets on Graphene as Sulfur.Based Composite Cathode Material for Lithium-Sulfur Batteries

In this work, nickel phosphide (Ni2P) nanosheets were dispersed uniformly on graphene (G) to fabricate the Ni2P/G composite. Furthermore, the S/Ni2P/G sulfur. based composite was prepared further for lithium. sulfur batteries. Due to the strong chemical absorbability and high electrocatalytic activity of Ni2P nanosheets towards solu. ble polysulfides, S/Ni2P/G composite showed superior electrochemical performance. In particular, under the condi. tion of high sulfur content (80.3%) and low electrolyte usage (15 mu L.mg(-1)), S/Ni2P/G composite delivered a high initial specific discharge capacity of 1 164.7 mAh.g(-1) and good cycling stability. In addition, due to the high tap density of 1.02 g.cm(-3), S/Ni2P/G composite showed a high volumetric capacity of 954.0 mAh.cm(-3), almost 1.6 times of that for S/G composite.