Synthesis method of lithium iron phosphate positive material for lithium ion battery
A lithium-ion battery, lithium iron phosphate technology, applied in the direction of battery electrodes, phosphorus compounds, chemical instruments and methods, etc., can solve the problem of high raw material cost, achieve uniform particle size, low production cost, maintain consistency and stability Effect
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[0031] Battery preparation and electrochemical performance testing method
[0032] ①. Preparation of battery positive electrode sheet:
[0033] Mix the obtained positive electrode material of lithium-ion battery, lithium iron phosphate, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) according to the mass ratio of 92:3:5 to obtain a mixed split. 10 grams of the mixed powder, Add 12 grams of N-methylpyrrolidone (NMP) as an organic solvent, stir well to form a slurry, coat the surface of aluminum foil, dry it, and roll it several times to obtain the positive electrode sheet of the battery;
[0034] ②, battery assembly and performance testing
[0035] The electrochemical performance of obtained lithium iron phosphate was evaluated using a 2016-type half-cell. The rolled battery pole piece is punched into a disc with a diameter of 12 mm. After accurately weighing its mass, the mass of lithium iron phosphate in the pole piece is calculated according to...
Embodiment 1
[0038] A kind of synthetic method of lithium iron phosphate lithium ion battery cathode material, specifically comprises the following steps:
[0039] (1) Add 115 parts of phosphoric acid to 400 parts of deionized water, stir to form a phosphoric acid solution, add 56 parts of reduced iron powder to the above phosphoric acid solution under stirring and react for 2 hours, then add the resulting product into the ball mill After ball milling for 2 hours, the material was discharged to obtain precursor A;
[0040] (2) Dissolve 42 parts of lithium hydroxide and 15 parts of sucrose in 250 parts of deionized water, add the obtained lithium hydroxide solution to the precursor A obtained in step (1) under stirring, and stir evenly to obtain Precursor B;
[0041] (3) The precursor B obtained in step (2) is spray-dried using a small two-fluid spray dryer in the laboratory under stirring, the feed rate is controlled at 5ml / min, and the temperature of the drying medium is about 200°C, that ...
Embodiment 2
[0047] A kind of synthetic method of lithium iron phosphate lithium ion battery cathode material, specifically comprises the following steps:
[0048] (1) Add 105 parts of phosphoric acid to 400 parts of deionized water, stir to form a phosphoric acid solution, add 50 parts of reduced iron powder to the above phosphoric acid solution under stirring and react for 2 hours, then add the resulting product into a ball mill After ball milling for 2 hours, the material was discharged to obtain precursor A;
[0049] (2) Dissolve 38 parts of lithium hydroxide and 15 parts of sucrose in 250 parts of deionized water to obtain the lithium hydroxide solution, add it to the precursor A obtained in step (1) under stirring, and obtain the precursor after stirring evenly Object B;
[0050] (3) Spray-dry the precursor B obtained in step (2) using a small-scale two-fluid spray dryer in the laboratory under stirring, control the feed rate at 5ml / min, and the temperature of the drying medium at a...
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