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To improve synthesis efficiency and performance of iron phosphate (FePO4) product, a precursor for cathode materials of lithium-ion batteries, a two-step process consisting of oxidation-precipitation, and conversion was proposed to prepare iron phosphate with ferrous sulfate and ammonium phosphate as raw materials. The effects of key parameters, such as addition amount of hydrogen peroxide (oxidant), feeding rate, and reaction temperature, on the particle size distribution (D50), purity, and Fe/P ratio of the product were investigated. The optimized process conditions were determined as follows:oxidation at a temperature of 40 ℃ for 2 h by adding hydrogen peroxide at an amount of 1.25 times the theoretical dosage and feeding material for 50 min in the oxidation stage; precipitation at a temperature of 40 ℃ by feeding ammonium phosphate for 50~55 min in the precipitation stage; and with phosphoric acid at concentration of 0.6 mol/L and a temperature of 90 ℃ for the conversion stage. As a result, a high-purity iron phosphate with D50 of 3.0 μm, impurity content lower than 0.01%, and Fe/P at a molar ratio of 0.997 can be successfully prepared. SEM and XRD characterization results show that the product consists of regular spherical secondary particles formed with densely stacked primary lamellar crystals, presenting higher degree of crystallinity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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