A method for preparing lithium iron phosphate by inclusion process
A lithium iron phosphate and process technology, which is applied in the field of chemical synthesis materials, can solve the problems of poor electrical conductivity of materials and affect material properties, and achieve the effects of simple and easy method, complete and uniform coating, and stable performance.
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Embodiment 1
[0018] The invention provides a method for preparing lithium iron phosphate by clathrate technology, which is characterized in that it comprises the following steps:
[0019] ① Weigh the soluble phosphorus source compound, iron source compound, lithium source compound and clathrate at a molar ratio of 1:1:2 to 3.6:1, then supersaturated dissolve them in deionized water or distilled water to form phosphorus sources respectively Compound solution, iron source compound solution, lithium source compound solution, clathrate solution;
[0020] ② Add the phosphorus source compound solution into the autoclave, raise the temperature of the autoclave to 50-110°C, then slowly add the iron source compound solution into the autoclave, feed inert gas into the autoclave, and then slowly inject the Add the lithium source compound solution, and finally slowly add the clathrate solution into the autoclave, then seal the autoclave, set the temperature in the autoclave to rise to 120-260 °C at a ...
Embodiment 2
[0025] A method for preparing lithium iron phosphate by inclusion process is characterized in that it comprises the following steps:
[0026] ① First weigh the soluble phosphorus source compound, iron source compound and lithium source compound according to the molar ratio, and supersaturated dissolve the weighed soluble phosphorus source compound, iron source compound and lithium source compound in deionized water or distilled water to form Molecular-level phosphorus source compound precursor solution, iron source compound precursor solution, and lithium source compound precursor solution, and then use a hydrothermal method to make the phosphorus source compound precursor solution, iron source compound precursor solution, and lithium source compound precursor The precursor of lithium iron phosphate was synthesized in an autoclave using the bulk solution;
[0027] ②Separate the contents of the autoclave from solid to liquid, and the obtained solid is the lithium iron phosphate...
Embodiment 3
[0033] (1) Weigh and dissolve ferrous sulfate heptahydrate, phosphoric acid, lithium hydroxide monohydrate and β-cyclodextrin at a molar ratio of 1:1:3:1, and the total solid content is 10% of that of the solvent water. %.
[0034] (2) Add the phosphoric acid solution and the ferrous sulfate heptahydrate solution into the autoclave to mix them with strong high-speed stirring, then slowly add the lithium hydroxide solution into the autoclave, pass in an inert protective gas, and finally add β-cyclodextrin to seal The reaction kettle starts to heat up at a rate of about 3°C / min, rising to 220°C, keeping the temperature of the reaction system at 220°C, and controlling the system pressure at 1.6MPa. The constant temperature time is controlled at 8 hours.
[0035] (3) After the reaction, the solid and liquid are separated by centrifugation or suction filtration. The separated solid is washed to obtain a lithium iron phosphate clathrate crystal precursor.
[0036] (4) Add the lit...
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