Thermal stability andflame retardant property are significant
parameters to evaluate the safety characteristic of separators. In
order to investigate the thermal stability of the SiO2/PEI-PU
membranes, thermal shrinkage behavior is observed by measuring
the area-based dimensional change after storing the membranes at
the temperature range from 90 to 180
C for 0.5 h respectively. As
can be seen inFig. 6a, the Celgard membrane thermally shrinks
seriously with increasing temperature, whereas, the dimensional
changes of PEI-PU and SiO2/PEI-PU membranes are negligible over
wide temperature ranges (90–130
C), and become more pronounced as the temperature increased (140–180
C). The photographs of relevant membranes before and after exposure to 180
C
for 0.5 h are presented in Fig. 6b and c. The Celgard membrane
shrinks severely (92%) with the color change from white to
transparent, whereas the relevant PEI-PU and SiO2/PEI-PU
membranes shrink by 9% and 5%, respectively. Based on these,
we can conclude that the SiO2/PEI-PU membranes exhibit better
thermal stability than PEI-PU and Celgard membranes. Accordingly, we can deduce that the significantly improved thermal stability
Thermal stability andflame retardant property are significantparameters to evaluate the safety characteristic of separators. Inorder to investigate the thermal stability of the SiO2/PEI-PUmembranes, thermal shrinkage behavior is observed by measuringthe area-based dimensional change after storing the membranes atthe temperature range from 90 to 180C for 0.5 h respectively. Ascan be seen inFig. 6a, the Celgard membrane thermally shrinksseriously with increasing temperature, whereas, the dimensionalchanges of PEI-PU and SiO2/PEI-PU membranes are negligible overwide temperature ranges (90–130C), and become more pronounced as the temperature increased (140–180C). The photographs of relevant membranes before and after exposure to 180Cfor 0.5 h are presented in Fig. 6b and c. The Celgard membraneshrinks severely (92%) with the color change from white totransparent, whereas the relevant PEI-PU and SiO2/PEI-PUmembranes shrink by 9% and 5%, respectively. Based on these,we can conclude that the SiO2/PEI-PU membranes exhibit betterthermal stability than PEI-PU and Celgard membranes. Accordingly, we can deduce that the significantly improved thermal stability
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