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)O-2 cathode exhibits promising lithium storage performance.
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