Iron phosphide (FeP) synthesis, and full cell lithium-ion battery study with a [Li(NiMnCo)O2] cathode

Abstract

A scalable two-step strategy is utilized to synthesize iron phosphide (FeP) from iron oxide (Fe₂O₃). The as-obtained iron phosphide is tested as a negative electrode for lithium-ion batteries both in half cell and full cell configurations. The electrochemical performance vs. lithium exhibits a capacity retention of 53.7% of the second discharge capacity (622 mA h g⁻¹) after 50 cycles using a CMC binder, utilizing both the insertion and conversion reactions. Potential limitation after the first discharge to 0.25 V exhibits a capacity of 227 mA h g⁻¹ after 50 cycles, utilizing only an insertion plateau. The electrochemical performance of iron phosphide in the full cell configuration with a Li(NiMnCo)O₂ cathode exhibits promising lithium storage performance.