One-Pot Synthesis of ®-Fe 2 O 3 Nanospindles as High-Performance Lithium-Ion Battery Anodes

Hematite nanospindles with a uniform size of 270 nm in length and 90 nm in width are prepared using a facile one-step hydrothermal method. Polyvinylpyrrolidone (PVP) serves as a structure-directing agent to control the primary morphology and aggregations. When evaluated as anode materials for lithium-ion batteries (LIBs), the electrode of sodium alginate (SA) binder exhibits a much better electrochemical performance than that with the polyvinylidene °uoride (PVDF) binder. Remarkably, the electrode using SA binder can deliver a high reversible speci ̄c capacity of 979mAh g 1 after 50 cycles and prominent rate capability. The microstructural evolution of the nanospindles after the electrochemical cycling is investigated by scanning transmission electron microscopy (STEM). Our results may provide important mechanistic insights for the design of nanostructured anode materials for LIBs.