High Level Metal Ferro Phosphorus

Preparation process of fine ferro phosphorus powder, warm pressing experiment of domestic iron powder with fine ferrophosphorus powder, found that corrosion ball milling can effectively refine ferrophosphorus, and the particle size can reach 11μm after 36h of ball milling. Wugang iron powder with fine ferrophosphorus powder can be used for binder-free warm pressing process to improve green body density. Adding fine ferrophosphorus powder may effectively promote the sintering densification process compared with coarse ferrophosphorus powder, and the pores are finer and smoother.

1.A method for preparing lithium ferro phosphorus comprises the following steps: preparing a lithium iron phosphate precursor; transferring the lithium iron phosphate precursor to a tubular furnace, controlling the temperature at 500-800°C under nitrogen protection, and calcining for 5-24 hours to obtain a synthetic product. The lithium iron phosphate product obtained by conventional high-temperature solid-phase reaction often contains impurities, has irregular morphology, large particles, uneven particle size, poor conductivity and reversibility. The lithium iron phosphate prepared by the present invention has high purity, excellent crystal structure and olivine crystal form with good particle size distribution. This homogeneous, high crystallinity, uniform particle size, small particle size and high specific surface area lithium iron phosphate material has good electrochemical properties. According to the LiFePO obtained by XRD test data.

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