The mechanical strength of separators should be strong enough
to suffer mechanical handling during cell winding and assembly.
As can be seen fromFig. 5a and b, the SiO2/PEI-PU membranes are
not mechanical broken after being folded and twisted several
times, implying their potential applications in cells. Meanwhile,
the stress-strain curves of as-prepared PEI-PU and SiO2/PEI-PU
membranes are showed inFig. 5c. It can be seen that both PEI-PU
and SiO2/PEI-PU composite membranes show a linear elastic
deformation in thefirst stage due to the non-bonding structure of
PEI-PUfibers slipping through frictional entanglement at lower
stress[20,36], and then the stress-strain curves exhibit a quasilinear elastic increase until the fibers break. This phenomenon
could be explained by the two-step break mechanism. As seen
from the FE-SEM images, both PEI-PU and SiO2/PEI-PU composite
membranes possess the bonding and non-bonding structures,
which could cause different structural transformations in the
strain process. When a small external load is applied, the
nonaligned nanofibers in membranes are forced to be aligned
The mechanical strength of separators should be strong enoughto suffer mechanical handling during cell winding and assembly.As can be seen fromFig. 5a and b, the SiO2/PEI-PU membranes arenot mechanical broken after being folded and twisted severaltimes, implying their potential applications in cells. Meanwhile,the stress-strain curves of as-prepared PEI-PU and SiO2/PEI-PUmembranes are showed inFig. 5c. It can be seen that both PEI-PUand SiO2/PEI-PU composite membranes show a linear elasticdeformation in thefirst stage due to the non-bonding structure ofPEI-PUfibers slipping through frictional entanglement at lowerstress[20,36], and then the stress-strain curves exhibit a quasilinear elastic increase until the fibers break. This phenomenoncould be explained by the two-step break mechanism. As seenfrom the FE-SEM images, both PEI-PU and SiO2/PEI-PU compositemembranes possess the bonding and non-bonding structures,which could cause different structural transformations in thestrain process. When a small external load is applied, thenonaligned nanofibers in membranes are forced to be aligned
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