Methods for preparing iron phosphate precursor and lithium iron phosphate positive electrode material
A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of carbon preparation/purification, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of tight supply of upstream raw material resources, rising prices, and resource shortages, and achieve low prices and low emissions. less, high recycling efficiency
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Embodiment 1
[0031] A method for preparing an iron phosphate precursor, the preparation process is as follows:
[0032] S1 Discharge the lithium iron phosphate battery in a sodium chloride solution, crush it, and dry it at 200°C to obtain black powder through airflow separation and gravity separation. The content of lithium iron phosphate in the sorted copper foil is less than 0.5%. The lithium iron phosphate content in the aluminum foil is less than 1%, the copper content in the black powder is less than 2%, and the aluminum content is less than 4%.
[0033] S2 According to the ratio of m (phosphoric acid): m (black powder): m (hydrogen peroxide) = 0.4:1:0.3, add phosphoric acid, black powder, hydrogen peroxide in sequence, leaching at 80°C for 12 hours, press filter, separate the carbon material, and obtain the filtrate .
[0034] S3 adds excessive Fe powder to step S2 filtrate, presses filtration after reacting for 5h, detects Cu content in the filtrate, the copper content in the solut...
Embodiment 2
[0038] A method for preparing lithium phosphate, the preparation process is as follows:
[0039] S1 Discharge the lithium iron phosphate battery in sodium chloride solution, crush it, and dry it at 200°C to obtain black powder through airflow separation and gravity separation. The content of lithium iron phosphate in the sorted copper foil is less than 0.5% , The lithium iron phosphate content in the aluminum foil is less than 1%, the copper content in the black powder is less than 2%, and the aluminum content is less than 4%.
[0040] S2 According to the ratio of m (phosphoric acid): m (black powder): m (hydrogen peroxide) = 0.5:1:0.3, add phosphoric acid, black powder, hydrogen peroxide in sequence, leaching at 80°C for 12 hours, press filter, separate the carbon material, and obtain the filtrate ;
[0041]S3 adds excessive Fe powder to step S2 filtrate, presses filtration after reacting for 5h, detects Cu content in the filtrate, the copper content in the solution after ir...
Embodiment 3
[0047] A method for preparing lithium iron phosphate cathode material, the preparation process is as follows:
[0048] S8, weigh lithium carbonate and iron phosphate prepared in Example 1 according to the molar ratio of lithium and iron being 1.01:1, add 10wt% glucose; add ultrapure water, control the solid content to 50%, and then perform ball milling, ball milling time 3h, ball milling The particle size D50 of the final material is 0.5-3μm; the material after ball milling is spray-dried at a temperature of 200°C, and the D50 of the material after spray drying is 5-20μm; the dried material is calcined at a temperature of 780°C, and the calcined The time is 8h, the calcining atmosphere is a nitrogen atmosphere, and the lithium iron phosphate cathode material is obtained, and the appearance is as follows Figure 5 shown.
[0049] The lithium iron phosphate prepared in this example, polyvinylidene fluoride, and acetylene black were mixed in a mass ratio of 8:1:1, uniformly coat...
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