Flexible Phosphorus-Doped Graphene/Metal–Organic Framework-Derived Porous Fe₂O₃ Anode for Lithium-Ion Battery

Abstract

Porous metal oxides and heteroatomic doping of carbon materials were extensively studied in lithium-ion batteries (LIBs). We designed an assembly of porous Fe2O3 nanoframework into three-dimensional P-doped graphene framework (PGF@pFe2O3NF) using metal–organic frameworks as the precursor of porous Fe2O3 and thermal treatment to obtain P doped graphene. The hierarchical structure with flexible macroporous P-doped graphene network and Fe2O3 nanoporous framework can effectively promote lithium diffusion. The flexible PGF@pFe2O3NF is directly compressed as binder-free LIB anode. It exhibited excellent capacity (1106 mAh g–1), rate performance (410 mAh g–1 at 4000 mA g–1), and superlong cycling performance of 88.2% capacity retention. Moreover, the PGF@pFe2O3NF-based LIB full cell is also with a high energy of 350.8 Wh kg–1. We offered a strategy to develop advanced porous Fe2O3-based anode for high-practicability LIBs.