Thanks for link@Chemist1959 it has given me a new search of separator science. So many papers to read. Great to have some constructive input on the FYI threads!
This is from this website and dated Nov 2017 and backs up again the importance Al2O3 will have in the battery world.
One important drawback of the polyolefin separator is its low thermal conductivity, which is a bottleneck barrier for heat transfer in Li-ion batteries. An Al2O3/PVdF-HFP composite separator was demonstrated to have a high thermal conductivity five times that of the commercial polyolefin separator [83]. This design combining Al2O3 nano/microparticles and the polymer of PVdF-HFP facilitates heat dissipation in the battery and reduces the temperature rise in operation, greatly reducing the risk of catching fire or explosion. In case of heat runaway and temperature increase, shutdown functionalized separators are needed for protection of batteries. Kim et al. prepared a nonwoven polyethylene-coated separator that exhibits thermal stability at 200oC and self-shutdowns at 140oC (Fig. 8b) [84]. In addition to the enhanced safety performance, the electrochemical property of the battery was also enhanced.
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