▎ 摘　　要

NOVELTY - Preparing lithium iron phosphate comprises (i) mixing the soluble lithium source compound, the soluble bivalent iron source compound and water to obtain the first raw material liquid; (ii) heating the first raw material liquid to a predetermined temperature, mixing the aqueous solution of the soluble phosphorus source compound with the first raw material liquid by spraying under first inert atmosphere and acidic condition and performing the first hydrothermal synthesis reaction to obtain first hydrothermal synthesis product system containing lithium iron phosphate; and (iii) subjecting the first hydrothermal synthesis product system to a second hydrothermal synthesis reaction with a raw material supplement under a second inert atmosphere, where raw material supplement comprises soluble lithium, iron and the soluble phosphorus source compound and heating rate of second hydrothermal synthesis reaction is lower than heating rate of aqueous solution of soluble phosphorus source compound. USE - The method is useful for preparing lithium iron phosphate for lithium ion battery (claimed) useful in vehicle, preferably electric vehicle, hybrid vehicle, plug-in hybrid electric vehicle and hydrogen-powered vehicle. ADVANTAGE - The method: can form lithium iron phosphate with uniform particle size distribution and improved the compaction density; and also solves the problem that the large particle has impurity phase. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) Lithium iron phosphate, prepared by as mentioned above, with powder compaction density under 30KN is 2.35-2.6 g/cm3; and (2) Lithium ion battery comprising an anode material comprising the lithium iron phosphate.