Separator storage modulus test

Does a battery separator have mechanical properties in compression tests?

Our previous work 14 showed that the mechanical properties of battery separator in compression tests noticeably differ from the properties, derived in tensile test. Moreover, the effects of fluid on the elastic response differ in tension and in compression.

What is the mechanical behavior of separators at low strain rates?

Overall, existing research focuses on the mechanical behavior of separators at low strain rates, typically below 10 1 /s, investigation into dynamic mechanical properties and failure mechanisms is still insufficient.

What is the effective modulus of a polypropylene separator?

We define the effective modulus as the maximum slope of the stress-strain curve between the low and high stress plateaus. Note that this is a measure of the stiffness of the separator structure, and is not the same as the Young's modulus of the polypropylene material that comprises the structure.

How does a commercial separator respond to compression at different strain rates?

Here we develop a model for predicting the elastic response of a commercial separator immersed in fluid to compression at different strain rates. We show that the response of the separator is determined by combination of viscoelastic behavior of the polymer skeleton and poroelastic behavior, due to the flow of the fluid in the pores.

What are the mechanical properties of a microporous polypropylene separator?

The compressive mechanical properties of a microporous polypropylene separator are characterized over a range of strain rates and in different fluid environments. These measurements are then compared to measurements of the rate and fluid-dependent mechanical properties of the separator under tension.

What is the effective modulus of a separator stress-strain curve?

These two parameters are chosen because they are characteristic of the major features of the separator stress-strain curve. We define the effective modulus as the maximum slope of the stress-strain curve between the low and high stress plateaus.