Preparation method of lithium iron phosphate as cathode material of lithium ion battery
A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of cathode materials for lithium-ion batteries, can solve the problems of being unsuitable for large-scale production, low degree of product crystallization, and low purity of synthesized products, and achieve excellent electrochemical performance. The effect of excellent chemical performance and low cost
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Embodiment 1
[0023] Mix 0.5 mole of iron powder, 0.5 mole of lithium dihydrogen phosphate, and 8% sucrose accounting for the total weight of the raw materials and put them into a rod mill jar, use ethanol as the medium, and fully mix them on the rod mill for 5 hours. Drying, the dried mixture is mechanically stirred and granulated with a polyvinyl alcohol solution of 5wt% relative to the total weight of the raw material, and the granulated mixture is put into a shaft furnace, under an argon atmosphere of 5 liters / min, at 6°C The temperature was raised to 300°C for 10 hours at a rate of 1 / min, then synthesized at 700°C for 20 hours, and then lowered to room temperature to obtain lithium iron phosphate. The measured tap density of the synthetic material is 1.43g / cm 3 . figure 1 For the synthesis product LiFePO 4 It can be seen from the scanning electron microscope photo that the particle size of the synthesized product is basically less than 2 microns. figure 2 For the synthesis product ...
Embodiment 2
[0027] Mix 0.5 mole of iron powder, 0.5 mole of ammonium dihydrogen phosphate, 0.55 mole of lithium hydroxide, and glucose accounting for 5% of the total weight of raw materials and put them into a rod mill jar, use water as the medium, and fully mix them on a rod mill Dry at 120°C for 12 hours. The dried mixture is mechanically stirred and granulated with a polyacrylamide solution of 10% by weight relative to the total weight of the raw materials. After granulation, it is placed in a shaft furnace under an argon atmosphere of 10 liters / min. , heated up to 350°C at a rate of 10°C / min for 20 hours, then synthesized at 700°C for 24 hours, and lowered to room temperature to obtain lithium iron phosphate. The measured tap density of lithium iron phosphate is 1.38g / cm 3 , the electrode sheet was also prepared according to the method of Example 1, and after being assembled into a battery, it was charged and discharged at a rate of 0.1C, and the measured reversible capacity was 153mA...
Embodiment 3
[0029]Mix 0.5 mole of iron powder, 0.26 mole of lithium carbonate, 0.5 mole of diammonium hydrogen phosphate, and polyethylene accounting for 20% of the total weight of the raw materials and put them into a rod mill tank, using ethanol as the medium, and fully mix them on a rod mill 5 hours, dry at 80 ℃, the mixture after drying is mechanically agitated and granulated with castor oil solution relative to the total weight of the raw material 3wt%, after granulation, the mixture is put into a shaft furnace, under 10 liters / min of argon Under an air atmosphere, the temperature was raised to 400°C at a rate of 10°C / min for 15 hours, then synthesized at 750°C for 24 hours, and then lowered to room temperature to obtain lithium iron phosphate. The measured tap density of lithium iron phosphate is 1.41g / cm 3 According to the method of Example 1, electrode sheets were prepared, assembled into a test battery, charged and discharged at a rate of 0.1C, and the reversible capacity was 155...
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Abstract
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