Octahedral Fe2P/C anchored on reduced graphene oxide as long-life and high-rate Li-ion battery anodes

Among all rechargeable secondary batteries, lithium-ion batteries (LIBs) are the most important breakthrough in the field of energy storage. In this paper, we successfully construct octahedral Fe2P/C composite nanoparticles anchored on reduced graphene oxide (Fe2P/C@rGO) nanocomposites as LIB anodes, used the synthesized octahedron Fe-metal–organic frameworks and graphene oxide composite (Fe-MOF@GO) as the precursor and NaH2PO2 as phosphorus source via high-temperature calcination. Under a current density of 0.1 A g−1, the reversible capacity of octahedral Fe2P/C@rGO is 983.1 mAh g−1 after 180 cycles. Its long-cycle performance is very good, its reversible capacity can still be kept at 733.3 mAh g−1 at 1.0 A g−1 after 500 cycles. Such excellent capacity is attributed to this unique three-dimensional octahedral structure. At the same time, the doping of P element and the addition of rGO also play an important role.