Nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and manufacturing method
A lithium iron phosphate, cycle life technology, applied in electrolyte battery manufacturing, secondary battery, final product manufacturing, etc. The material is baked out and the bonding fastness does not meet the technological requirements, so as to reduce the heat generation, improve the bonding fastness and reduce the internal resistance.
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Embodiment 1
[0040] An ultra-high rate, ultra-long cycle life nano-lithium iron phosphate power battery and a manufacturing method thereof, in weight percentage, comprising the following process steps:
[0041] 1. Control the ambient humidity: firstly, ensure the ambient humidity during the production of lithium iron phosphate cathode powder. 200ppm, while ensuring the humidity of the battery manufacturing environment to ensure that the battery pole pieces are not polluted by secondary water.
[0042]2. Configure LFP premix: Take 2.0kg of N-methylpyrrolidone solvent (hereinafter referred to as NMP solvent), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm, a high speed of 800rpm, and stir for 60 minutes at the same time , add NMP0.66kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix solution is configured as a lithium iron phosphate solid powder and NMP solvent, so that the lithium iron ph...
Embodiment 2
[0061] The preparation method of the present invention comprises the following process steps:
[0062] 1. First of all, ensure the ambient humidity when producing lithium iron phosphate positive electrode powder. The ambient humidity dew point temperature is controlled below -45°C, so that the moisture content of lithium iron phosphate positive electrode powder does not exceed 200ppm under the moisture test at 400°C. At the same time, ensure that The humidity of the battery manufacturing environment ensures that the battery pole pieces are not polluted by secondary water.
[0063] 2. Configure the LFP premix: Take 2.0kg of N-methylpyrrolidone solvent (NMP solvent for short), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm and a high speed of 800rpm. After stirring for 60min at the same time, Add NMP0.455kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix solution is configured...
Embodiment 3
[0082] The preparation method of the present invention comprises the following process steps:
[0083]1. First of all, ensure the ambient humidity when producing lithium iron phosphate positive electrode powder. The ambient humidity dew point temperature is controlled below -45°C, so that the moisture content of lithium iron phosphate positive electrode powder does not exceed 200ppm under the moisture test at 400°C. At the same time, ensure that The humidity of the battery manufacturing environment ensures that the battery pole pieces are not polluted by secondary water.
[0084] 2. Configure the LFP premix: Take 2.3kg of N-methylpyrrolidone solvent (NMP solvent for short), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm and a high speed of 800rpm. After stirring for 60min at the same time, Add NMP0.58kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix is configured as an LF...
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