Owing to their natural abundance, the low potential, and the low cost of potassium, potassium-ion batteries are regarded as one of the alternatives to lithium-ion batteries. In this work, we successfully fabricated a FeP/C composite, a novel electrode material for PIBs, through a simple and productive high-energy ball-milling method. The electrode delivers a reversible capacity of 288.9 mA·h·g (2nd) at a discharge rate of 50 mA g, which can meet the future energy storage requirements. Density functional theory calculations suggest a lower diffusion barrier energy of K than Na, which allows faster K diffusion in FeP.
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