Boosting the Sodiation Capability and Stability of FeP by In Situ Anchoring on the Graphene Conductive Framework

Metal phosphides (MPs) have emerged as a new class of high-capacity and low-cost anodes for sodium-ion batteries (SIBs). In order to buffer the volume change during the sodiation process and improve the conductivity, we synthesized a porous composite made of FeP nanoparticles uniformly anchored on 3D reduced graphene oxide structure (FeP@rGO) by a low-temperature chemical solution deposition method with subsequent phosphorization and thermal reduction processes. Electrochemical characterization indicated that the FeP@rGO composite nanostructured anode delivers an attractive reversible capacity up to 366.6 mAhg(-1) with superior cycling stability (388.8 mAhg(-1) after 250 cycles) and high Coulombic efficiency (> 99%), which is among the previously reported high performance transition MPs-based SIBs anode materials.