Two-Dimensional Iron Phosphorus Trisulfide as a High-Capacity Cathode for Lithium Primary Battery.

Metal phosphorus trichalcogenide (MPX 3 ) materials have aroused substantial curiosity in the evolution of electrochemical storage devices due to their environment-friendliness and advantageous X-P synergic effects. The interesting intercalation properties generated due to the presence of wide van der Waals gaps along with high theoretical specific capacity pose MPX 3 as a potential host electrode in lithium batteries. Herein, we synthesized two-dimensional iron thio-phosphate (FePS 3 ) nanoflakes via a salt-template synthesis method, using low-temperature time synthesis conditions in single step. The electrochemical application of FePS 3 has been explored through the construction of a high-capacity lithium primary battery (LPB) coin cell with FePS 3 nanoflakes as the cathode. The galvanostatic discharge studies on the assembled LPB exhibit a high specific capacity of ~1791 mAh g -1 and high energy density of ~2500 Wh Kg -1 along with a power density of ~5226 W Kg -1 , some of the highest reported values, indicating FePS 3 's potential in low-cost primary batteries. A mechanistic insight into the observed three-staged discharge mechanism of the FePS 3 -based primary cell resulting in the high capacity is provided, and the findings are supported via post-mortem analyses at the electrode scale, using both electrochemical- as well as photoelectron spectroscopy-based studies.