High-compaction-density lithium iron phosphate and preparation method thereof
A lithium iron phosphate, iron phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of short process flow and increase raw material cost, and achieve the effect of simple process, low cost and good cost advantage
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Embodiment 1
[0062] (1) Select iron phosphate A with a particle size of 3 μm and iron phosphate B with a particle size of 0.1 μm, and mix iron phosphate A and B according to a mass ratio of 3:7 to obtain mixed iron phosphate C;
[0063] Wherein, the scanning electron microscope (scanning electronmicroscope, SEM) figure of the iron phosphate A with the primary particle size of 3 μm is as attached figure 1 As shown, from the electron microscope picture, the primary particle size of the material is about 3 μm;
[0064] The SEM image of the iron phosphate B with a primary particle size of 0.1 μm is as attached figure 2 As shown, from the electron microscope picture, the primary particle size of the material is about 0.1 μm;
[0065] (2) Lithium carbonate and mixed iron phosphate C are mixed according to a molar ratio of 1:1, and glucose that accounts for 15% of the weight of the lithium iron phosphate precursor is added for mixing. Add ethanol to 50% of the total mass of ethanol for grindin...
Embodiment 2
[0069] (1) Select iron phosphate A with a particle size of 1 μm and iron phosphate B with a particle size of 0.05 μm, and mix iron phosphate A and B according to a mass ratio of 1:9 to obtain mixed iron phosphate C;
[0070] (2) Lithium acetate, mixed iron phosphate C, and manganese acetate are mixed according to a molar ratio of 1:1:0.01, and citric acid accounting for 1% of the weight of the lithium iron phosphate precursor is added for mixing, according to the materials (lithium acetate, mixed phosphoric acid Add ethanol to 50% of the total mass of iron C, manganese acetate, citric acid and ethanol) for grinding, take out the slurry after 2 hours, test the particle size of the slurry D50=0.95 μm, dry the slurry at 80°C, and obtain the lithium iron phosphate precursor body powder;
[0071] (3) Put the dried powder in N 2 Under the atmosphere, the temperature is raised at a heating rate of 5°C / min, and the temperature reaches 650°C for 15 hours to obtain sintered lithium iro...
Embodiment 3
[0073] (1) Select iron phosphate A with a primary particle size of 0.6 μm, and iron phosphate B with a primary particle size of 0.2 μm, and mix iron phosphate A and B according to a mass ratio of 5:5 to obtain mixed iron phosphate C;
[0074] (2) Lithium hydroxide, mixed iron phosphate C, and magnesium oxide are mixed according to a molar ratio of 1:1:0.025, and sucrose with 8% of the weight of the precursor is added for mixing, according to the materials (lithium hydroxide, mixed iron phosphate C, Add ethanol to 50% of the total mass of magnesium oxide, sucrose and ethanol) for grinding, take out the slurry after 5 hours, test the slurry particle size D50=0.49 μm, dry the slurry at 80° C., and obtain the lithium iron phosphate precursor powder;
[0075] (3) Put the dried powder in N 2 Under the atmosphere, the temperature is raised at a heating rate of 2°C / min, and the temperature reaches 800°C for 6 hours to obtain sintered lithium iron phosphate, and the sintered lithium ir...
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