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

Porous metal oxides and heteroatomic doping of carbon materials were extensively studied in lithium-ion batteries (LIBs). We designed an assembly of porous Fe 2 O 3 nanoframework into three-dimensional P-doped graphene framework (PGF@pFe 2 O 3 NF) using metal–organic frameworks as the precursor of porous Fe 2 O 3 and thermal treatment to obtain P doped graphene. The hierarchical structure with flexible macroporous P-doped graphene network and Fe 2 O 3 nanoporous framework can effectively promote lithium diffusion. The flexible PGF@pFe 2 O 3 NF 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@pFe 2 O 3 NF-based LIB full cell is also with a high energy of 350.8 Wh kg –1 . We offered a strategy to develop advanced porous Fe 2 O 3 -based anode for high-practicability LIBs.