Method for preparing LixFeyPzO4 from ferrophosphorous
A technology of ferrophosphorus and phosphorus sources, applied in chemical instruments and methods, phosphorus compounds, nanotechnology for materials and surface science, etc. The content is uncertain and other problems, so as to overcome the difficulty of raw material ratio, eliminate the easy corrosion of equipment, and easy to control the appearance.
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[0023] Example 1
[0024] Using solid-liquid low-temperature reaction 1.5 P preparation of lithium iron phosphate LiFePO 4 , The phosphorus iron slag Fe 1.5 P is pulverized to a particle size above 700 meshes. According to the different magnetic properties of ferrophosphorus and impurities, the high-purity ferro-phosphorus is transferred into a clean container by magnetic flotation to eliminate the influence of impurity elements in the raw materials of ferro-phosphorus on the product. Put it into a hydrothermal kettle lined with PTFE, according to LiFePO 4 The molar ratio of total lithium element, total iron element and total phosphorus element is 1.0:1.0:1.0. Phosphoric acid and lithium hydroxide are added. Hydrogen peroxide is added according to the composition of raw materials and products. An external magnetic field can be used to strengthen the reaction and transfer process. If necessary, water or ethanol solvents can be added, or some substances that dope, coat or compound t...
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[0027] Example 2
[0028] Preparation of lithium iron phosphate LiFePO from ferrophosphorus FeP by solvothermal method 4 , The ferro-phosphorus powder with a particle size greater than 1000 meshes is purified by flotation of density and magnetic difference, and the high-purity ferro-phosphorus FeP is transferred into a reactor lined with fluorine rubber, and then combined with lithium phosphate Li 3 PO 4 , Phosphoric acid H 3 PO 4 , Iron oxide Fe 2 O 3 Press LiFePO 4 The molar ratio of the total lithium element, the total iron element and the total phosphorus element is 1.0:1.0:1.0 for batching. A certain amount of hydrogen peroxide can be added according to the composition of the raw material and product, and a certain amount of ethanol can be added as a solvent. More than 2 / 3 of the volume of the reactor, heated with molten salt, reacted at 150℃~350℃ for 20~40h to obtain LiFePO 4 The precursor aqueous solution is concentrated and granulated to control the morphology and particle ...
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[0031] Example 3
[0032] An electrolytic cell is added to the low-temperature reactor, and the atomic oxygen generated in the anode is used to directly oxidize the phosphorus element in the ferrophosphorus, and the pressure generated by the system is used to accelerate the reaction. The hydrogen generated by the electrolysis of water is extracted as the clean heating raw material for the reactor, and it is adjusted Raw materials and process parameters to achieve LiFePO 4 The in-situ synthesis of the product, the specific operation process is as follows: the high-purity ferrophosphorus Fe 1.5 P, lithium carbonate, phosphoric acid according to LiFePO 4 The molar ratio of total lithium element, total iron element and total phosphorus element is 1.0:1.0:1.0 for batching. The total amount of reaction materials does not exceed 3 / 4 of the volume of the reactor. Put the graphite anode of the electrolytic cell into the reaction In the kettle, the anode chamber and the cathode chamber are ...
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