Hierarchically Porous Fep Nanospindles Wrapped by Nitrogen-Phosphorus Co-Doped Carbon for Enhanced Lithium Storage Performance

The hierarchical porous iron phosphides nanospindles with nitrogen-phosphorus co-doped carbon coatings (FeP@NPC) are fabricated via a combination of hydrothermal synthesis and subsequent phosphating treatment, which is extensively researched for elevating the outstanding performance of lithium-ion batteries (LIBs). The as-prepared FeP@NPC nanocomposite manifests a distinguished specific capacity of 1100 mAh g -1 after 200 cycles at 0.2 A g -1 , a ranking rate performance with a high capacity of ~600 mAh g -1 at 5 A g -1 and a reversible long cycling capacity of 951.7 mAh g -1 after 800 cycles at 1 A g -1 . The superior properties can be ascribed to the joint contribution of well-designed porous nanostructure and conductive N, P co-doped carbon coating, which simultaneously facilitates efficient transmission of lithium ions and electrons, contributes to mild volume expansion and elevates structure stability during reversible charge-discharge process