For the production of Lithium Iron Phosphate (LiFePO4) batteries, purity is paramount. You must ensure the Fe content is between 26-30% and the P content is between 15-17%. Pay close attention to the D50 particle size distribution (typically 2-4μm) and the specific surface area (BET), as these directly impact the electrochemical performance and energy density of the final battery cells. Additionally, verify that magnetic impurities (Fe, Cr, Ni, Zn) are kept at ppb (parts per billion) levels to prevent internal short circuits.