Water vapor transmission rate tester W401 2.0

permeabilityfor lithium-ion battery separators

1. Wettability and wetting speed. Poor wettability of the separator will increase the resistance of the separator and lithium battery, affecting the cycle performance and charge-discharge efficiency of the lithium battery. The wetting speed of the diaphragm refers to the speed at which the electrolyte enters the micropores of the diaphragm, which is related to the surface energy, pore size, porosity, tortuosity and other characteristics of the diaphragm. 2. The liquid absorption rate of the diaphragm. Since the lithium battery diaphragm material also has the function of electrolyte, it must meet the following conditions: sufficient liquid absorption rate to ensure the unimpeded ion channel, and in the battery system, there will inevitably be a large number of side reactions that consume a large amount of electrolyte, so there must be sufficient reserves, otherwise the interface resistance will increase due to the lack of electrolyte, and the consumption of electrolyte will be accelerated. This will be a vicious cycle, so the liquid absorption rate is a very important diaphragm parameter.