Effect of separator on battery performance

The quality of the separator will directly affect the capacity of the battery, the life of the charge and discharge cycle and the performance of self-discharge.The results of battery analysis show that the main reasons affecting the low cycle life of the battery are as follows:

Because the diaphragm with poor quality has a large aperture and uneven aperture distribution and thickness, with the progress of charge and discharge, the positive lead powder gradually passes through the separator to the negative side, while the negative lead dendrite may penetrate the separator, and finally cause the battery chronic short circuit.

So with the charge and discharge, the capacity of the battery gradually decreased and failure.From the battery anatomy after the end of life, we can see that the separator side of the negative electrode turned reddish brown, indicating that a small amount of lead powder has passed through the separator.