Electrode-active anion-deficient non-stoichiometric lithium iron phosphate, method for preparing the same

摘要

The invention provides an anion-deficient non-stoichiometric lithium iron phosphate as an electrode-active material, which is represented by the formula Li1-xFe(PO4)1-y, wherein 0 x ≤ 0.15 and 0 y ≤ 0.05. The invention provides a method for preparing said Li1-xFe(PO4)1-y, which comprises preparing a precursor of lithium iron phosphate; mixing said precursor with water under reaction conditions of 200 ∼ 700°C and 180 ∼ 550 bar to produce lithium iron phosphate; and calcining, or granulating and calcining the resultant compound.