Dry Homogenization Process of Lithium Iron Phosphate Start-Stop Battery Cathode Slurry and Prepared Slurry
A technology of lithium iron phosphate and battery cathode, which is applied in the field of dry homogenization of cathode slurry of lithium iron phosphate start-stop battery, can solve the problems of affecting the safety performance of the battery, prolonging the stirring time in the high-speed dispersing stage, and having many particles, and achieves a high level of improvement. Rate charge-discharge performance and service life, avoid the stirring paddle rubbing against the cylinder, and increase the effect of the contact area
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Embodiment 1
[0022] A dry homogenization process for positive electrode slurry of lithium iron phosphate start-stop battery. The dry powder feeding amount accounts for 60% of the effective volume of the mixer. The specific process is as follows:
[0023] S1. Dry mixing stage: according to the formula requirements of lithium iron phosphate start-stop battery, put the dry powder (lithium iron phosphate, PVDF, conductive agent) into the mixing tank with circulating water cooling function at one time, the revolution speed is 10rpm, the dispersion speed is 100rpm, and stir The time is 15 minutes, set the mixer alarm shutdown current 110A, delay time 1″ before starting the mixing, and control the temperature of the mixing process at 40-50°C;
[0024] S2. Wetting stage: add conductive paste to the dry powder mixed in the above step S1, add the conductive paste in 4 times, the revolution speed is 15rpm, the dispersion speed is 300rpm, the stirring time is 5min each time, and the temperature during ...
Embodiment 2
[0029] A dry homogenization process for the positive electrode slurry of lithium iron phosphate start-stop battery. The dry powder feeding amount accounts for 75% of the effective volume of the mixer. The specific mixing process is as follows:
[0030] S1. Dry mixing stage: According to the formula requirements of lithium iron phosphate start-stop battery, put the dry powder into the mixing tank with circulating water cooling function at one time, the revolution speed is 15rpm, the dispersion speed is 200rpm, and the mixing time is 15min. Before starting the mixing, set the mixer to alarm and stop The current is 100A, the delay time is 1", and the temperature during the stirring process is controlled at 40-50°C;
[0031] S2. Wetting stage: Add the conductive paste to the dry powder mixed in the above step S1, add the conductive paste in 5 times, the revolution speed is 20rpm, the dispersion speed is 400rpm, the stirring time is 5min each time, and the temperature during the sti...
Embodiment 3
[0036] A dry homogenization process for positive electrode slurry of lithium iron phosphate start-stop battery. The dry powder feeding amount accounts for 90% of the effective volume of the mixer. The specific mixing process is as follows:
[0037] S1. Dry mixing stage: According to the formula requirements of lithium iron phosphate start-stop battery, put the dry powder into the mixing tank with circulating water cooling function at one time, the revolution speed is 15rpm, the dispersion speed is 300rpm, and the mixing time is 15min. Before starting the mixing, set the mixer to alarm and stop The current is 90A, the delay time is 1", and the temperature during the stirring process is controlled at 40-50°C;
[0038] S2. Wetting stage: add conductive paste to the dry powder mixed in the above step S1, add the conductive paste in 6 times, the revolution speed is 25rpm, the dispersion speed is 500rpm, the stirring time is 5min each time, and the temperature during the stirring pro...
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