High power lithium iron phosphate cell and manufacturing method thereof
A lithium iron phosphate battery, lithium iron phosphate technology, applied in secondary batteries, battery electrodes, final product manufacturing, etc., can solve the problems of low reversible specific capacity, battery power consumption, low tap density, etc., and achieve an increase in volume ratio. Capacity, increase heat dissipation effect, and reduce the effect of usage
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Embodiment 1
[0045] Taking the manufacture of 18650 type 1100mAh lithium iron phosphate battery as an example, the tap density is less than 1.1g / cm 3 , the specific surface area is higher than 18m 2 Lithium iron phosphate powder with a D50 of 0.3 to 1 micron and a carbon content of less than 3% is used as the initial lithium iron phosphate material. It is placed in a closed vacuum container and stirred at a high speed by a mixer. At the same time, the upper part of the vacuum container The spray nozzle sprays a polyvinyl alcohol aqueous solution with a concentration of 5%, and the total amount of the sprayed solution is 1% of the powder weight, and lasts for 1 hour until the material is semi-dry granular, and the particle diameter is 1mm.
[0046] The granulated powder is treated at 700°C for 4 hours under the protection of flowing inert gas to obtain a high tap density lithium iron phosphate product. After measurement, the average particle size of the product is 8-15μm, and the tap densi...
Embodiment 2
[0052] Taking the manufacture of 18650 type 1300mAh lithium iron phosphate battery as an example, the selected tap density is less than 1.1g / cm 3 , the specific surface area is higher than 18m 2 Lithium iron phosphate powder with a D50 of 0.3 to 1 micron and a carbon content of less than 3% is used as the initial lithium iron phosphate material. It is placed in a closed vacuum container and stirred at a high speed by a mixer. At the same time, the upper part of the vacuum container The concentration of the spray nozzle is 0.5% ethanol solution of epoxy resin, the total amount of the sprayed solution is 10% of the powder weight, and lasts for 4 hours, until the material is semi-dry granular, and the particle diameter is 0.5mm.
[0053] The granulated powder is treated at 650°C for 10 hours under the protection of flowing inert gas to obtain high tap density lithium iron phosphate. After measurement, the average particle size of the product is 6-13μm, and the tap density is 2.3...
Embodiment 3
[0059] Taking the manufacture of 18650 type 1300mAh lithium iron phosphate battery as an example, the selected tap density is less than 1.1g / cm 3 , the specific surface area is higher than 18m 2 Lithium iron phosphate powder with a D50 of 0.3 to 1 micron and a carbon content of less than 3% is used as the initial lithium iron phosphate material. It is placed in a closed vacuum container and stirred at a high speed by a mixer. At the same time, the upper part of the vacuum container The spray nozzle sprays out a methanol solution with a concentration of 10% phenolic resin. The total amount of the sprayed solution is 2% of the powder weight, and lasts for 1 hour until the material is semi-dry and granular, and the particle diameter is 0.8mm.
[0060] The granulated powder is treated at 700°C for 4 hours under the protection of flowing inert gas to obtain high tap density lithium iron phosphate. After measurement, the average particle size of the product is 7-15μm, and the tap d...
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Abstract
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